Mechanical Processes
1. In traditional machining, which component is made of a relatively harder material?
a) Tool
b) Workpiece
c) Holding device
d) None of the mentioned
.
Answer: a
Explanation: Tool should be harder than workpiece in order to cut the workpiece according to the required geometry.
2. For machining to take place, tool should be penetrated into work piece to a certain _____________
a) Height
b) Depth
c) Length
d) Width
.
Answer: b
Explanation: Chips are removed only when certain depth is given.
3. Which motion is responsible to determine the geometry of jobs to be machined?
a) Only Motion of tool
b) Only motion of work piece
c) Relative motion between tool and work piece
d) None of the mentioned
.
Answer: c
Explanation: Relative motion between the above mentioned components are required for machining.
4. Turning is done on which type of surfaces?
a) Flat surfaces
b) Cylindrical surfaces
c) Irregular surfaces
d) Spherical surfaces
.
Answer: b
Explanation: Turning is generally used to produce cylindrical surfaces.
5. Shaping and Milling are used to generate which one of the following?
a) Cylindrical surfaces
b) Flat surfaces
c) Irregular surfaces
d) Spherical surfaces
.
Answer: b
Explanation: They are used for generation of flat surfaces.
6. Drilling is used to produce which type of geometry?
a) Slots
b) Holes
c) Profiles
d) Keyways
.
Answer: b
Explanation: Drilling is one of the processes which are used to produce holes.
7. As the temperature increases, what happens to material’s strength?
a) increases
b) decreases
c) increases and then decreases
d) remains same
.
Answer: b
Explanation: As the temperature increases, materials lose their strength.
8. As the temperature is increased, ductility is ___________
a) increased
b) decreased
c) increased and then decreased
d) remains same
.
Answer: a
Explanation: As temperature increases, ductility of material is also increases.
9. In abrasive machining __________ are used to form the tool.
a) iron particles
b) grains and grits
c) steel alloy particles
d) aluminium particles
.
Answer: b
Explanation: Grains are used as abrasive particles.
10. Abrasive machining is used when __________ is needed.
a) Cutting
b) Roughing
c) Finishing
d) Drilling
.
Answer: c
Explanation: Grains are used for finishing.
11. Non-Traditional machining is recommended when we need which of the following features?
a) Complex shapes
b) High surface quality
c) Low-rigidity structures
d) All of the mentioned
.
Answer: d
Explanation: For above requirements this machining is used.
12. Non-Traditional machining can also be called as ________
a) Contact Machining
b) Non-contact machining
c) Partial contact machining
d) Half contact machining
.
Answer: b
Explanation: Tool and work piece are at a distance apart in this type of machining.
13. In which of the following industries, Non-traditional machining methods play an important role?
a) Automobile
b) Aerospace
c) Medical
d) All of the mentioned
.
Answer: d
Explanation: Non-traditional methods are used widely in many industries.
14. Different classifications of Non-traditional machining based on source of energy are ________
a) Mechanical
b) Thermal
c) Chemical and electro-chemical.
d) All of the mentioned
.
Answer: d
Explanation: It can be classified into the above mentioned categories.
15. In mechanical machining, material is removed by ___________
a) Erosion
b) Corrosion
c) Abrasion
d) Vaporization
.
Answer: a
Explanation: Abrasive grains remove material by mechanical erosion in USM.
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16. Material in thermal machining is removed by which of the following means?
a) Vaporization
b) Melting
c) Electro-plating
d) All of the mentioned
.
Answer: d
Explanation: In this machining, heat is the source of energy.
17. Which of the following process comes under mechanical machining?
a) USM
b) EDM
c) LBM
d) PAM
.
Answer: a
Explanation: USM removes material by mechanical erosion.
18. Surface defects that may be occurred during thermal machining are ________
a) Micro cracking
b) Heat affected zones
c) Striations
d) All of the mentioned
.
Answer: d
Explanation: During thermal machining surfaces defects occur.
19. Sources used in thermal machining are ________
a) Ions
b) Plasma
c) Electrons
d) All of the mentioned
.
Answer: d
Explanation: Different sources are used to remove the materials accordingly.
20. Vacuum is the machining medium for ________
a) LBM
b) WJM
c) EBM
d) None of the mentioned
.
Answer: a
Explanation: Vacuum is the medium for Laser Beam Machining and Ion Beam machining.
21. In chemical machining is material removal takes by?
a) Chemical reaction
b) Erosion
c) Electron removal
d) None of the mentioned
.
Answer: a
Explanation: Chemical machining removes material by chemical reactions.
22. Which of the following is an example of hybrid machining?
a) Ultrasonic Machining
b) Electron Beam Machining
c) Ultrasonic assisted electrochemical machining
d) Laser Beam Machining
.
Answer: c
Explanation: More than one phase is used to combine to form hybrid machining.
23. Who discovered USM?
a) Balamuth
b) Paul O Flawer
c) Turing
d) Steve John
.
Answer: a
Explanation: Balamuth was the scientist, who discovered Ultrasonic Machining.
24. What is the full form of USM in advanced machining process?
a) Ultrasound manufacturing
b) Ultrasonic machining
c) UV spectrum manufacturing
d) Ultra sonar machining
.
Answer: b
Explanation: Full form of USM in advanced machining processes, is Ultrasonic machining.
25. USM removes materials using the ____________ tool.
a) Perpendicularly rotating
b) Perpendicularly oscillating
c) Axially oscillating
d) Inclined oscillating
.
Answer: c
Explanation: Material is removed using axial oscillating tool.
26. Which is softer material in USM?
a) Tool
b) Work piece
c) Tool & Work piece
d) None of the mentioned
.
Answer: a
Explanation: Tool is softer than work piece in USM.
27. Frequency of tool’s oscillation in USM ranges between ________
a) 5-10 kHz
b) 10-15 kHz
c) 18-20 kHz
d) 25-50 kHz
.
Answer: c
Explanation: Frequency used in USM is between 18 – 20 kHz.
28. Amplitude of oscillation of tool in USM ranges between ________
a) 0.1-10 μm
b) 10-40 μm
c) 50-100 μm
d) 100-1000 μm
.
Answer: b
Explanation: The optimal range used is between 10-40 μm.
29. In which year, discovery of USM took place?
a) 1910
b) 1925
c) 1943
d) 1945
.
Answer: d
Explanation: Ultrasonic Machining was discovered in 1945.
30. The machining system of USM contains which of the following components?
a) Magnetostrictor
b) Concentrator
c) Tools and slurry
d) All of the mentioned
.
Answer: d
Explanation: In machining system of USM, the above-mentioned components have to be present.
31. In Ultrasonic Machining, Magnetostrictor is energized at ultrasonic frequency.
a) True
b) False
.
Answer: a
Explanation: To oscillate, magnetostrictor must be energized to the ultrasonic frequency in USM.
32. Of the following scientists, who discovered magnetostrictor effect?
a) Balamuth
b) Steve O Flawer
c) Joule
d) Turing
.
Answer: c
Explanation: This effect was discovered by Joule in 1874 at Manchester.
33. In Ultrasonic Machining, magnetostrictor converts magnetic energy into which type of energy?
a) Mechanical energy
b) Electrical energy
c) Thermal energy
d) None of the mentioned
.
Answer: a
Explanation: Oscillation of magnetostrictor takes place by converting magnetic energy to mechanical energy.
34. What is the value of the amplitude obtained without mechanical amplifier?
a) 0.0001 – 0.001 µm
b) 0.001 – 0.1 µm
c) 1 – 10 µm
d) 10 – 100 µm
.
Answer: b
Explanation: Relatively very small amplitudes are obtained without amplifier.
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35. What is the value of the amplitude obtained when we use mechanical amplifier?
a) 1 – 10 µm
b) 10 – 40 µm
c) 40 – 50 µm
d) 50 – 100 µm
.
Answer: c
Explanation: Relatively larger amplitudes are obtained when amplifier is used.
36. In USM, tool tips must have low resistance and fatigue strength.
a) True
b) False
.
Answer: b
Explanation: In USM, tool tips should must have high wear resistance and fatigue strength.
37. At what rate slurry is pumped through nozzle in USM?
a) 10 L/min
b) 25 L/min
c) 50 L/min
d) 75 L/min
.
Answer: b
Explanation: Slurry is pumped through nozzle at the rate of 25 L/min, L- litres.
38. By which of the following means, material is removed in USM?
a) Mechanical abrasion
b) Microchipping
c) Cavitation
d) All of the mentioned
.
Answer: d
Explanation: In Ultrasonic Machining, material is removed by any of the above means.
39. What is the percentage of contribution of cavitation to the total material removed?
a) <5%
b) 5 – 10 %
c) 10 – 20 %
d) 20 – 50 %
.
Answer: a
Explanation: Cavitation contributes to only less than 5 % of total material removed.
40. In the following mechanisms, which one is dominant in material removal?
a) Hammering
b) Cavitation
c) Microchipping
d) None of the mentioned
.
Answer: a
Explanation: Hammering is dominant mechanism in material removal of USM.
41. When machining porous material, which type of mechanism is introduces?
a) Abrasion
b) Erosion
c) Corrosion
d) Vaporization
.
Answer: b
Explanation: Material removal of porous material takes place by erosion.
42. The rate of material removal depends on which of the following features?
a) Frequency
b) Static Pressure
c) Machining area
d) All of the mentioned
.
Answer: d
Explanation: Material removal rate depends on all the above mentioned factors.
43. The machinability of USM depends on brittleness criterion.
a) True
b) False
.
Answer: a
Explanation: Both machinability and MRR depends on brittleness of material.
44. Which of the following are the features of tool affecting MRR in USM?
a) Hardness
b) Wearability
c) Accuracy
d) Mounting
.
Answer: d
Explanation: Different features of tool also affect the material removal in USM.
45. What is the machinability rate of glass by USM?
a) 25%
b) 50%
c) 75%
d) 100%
.
Answer: d
Explanation: In the case of brittle materials, Ultrasonic Machining’s MRR is very high.
46. What happens to MRR with an increase in tool amplitude?
a) Increases
b) Decreases
c) Remains same
d) None of the mentioned
.
Answer: a
Explanation: As amplitude of the tool increases, rate of material removal increases.
47. The vibration amplitude determines, which parameter of the abrasive particles?
a) Force
b) Torque
c) Velocity
d) Pressure
.
Answer: c
Explanation: Amplitude determines the velocity of abrasive particles between tool and work piece.
48. If splashing occurs, it will result in an increase of material removal rate in USM.
a) True
b) False
.
Answer: b
Explanation: Splashing occurs if amplitude is very high which in turn decreases the material removal rate.
49. Amplitude of the oscillation ranges between which of the following values?
a) 0.01 – 0.04 mm
b) 0.04 – 0.08 mm
c) 0.08 – 0.10 mm
d) 0.10 – 0.20 mm
.
Answer: b
Explanation: Optimum value of the amplitude of the tool will vary between 0.04-0.08 mm.
50. As the vibration frequency increases, what happens to material removal rate?
a) Decreases
b) Increases
c) Increase and then decrease
d) Decrease and then increase
.
Answer: c
Explanation: Up to a certain limit of vibration frequency, MRR increases and after that it decreases.
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51. Which of the following can be used as an abrasive carrying medium?
a) Water
b) Benzene
c) Glycerol
d) All of the mentioned
.
Answer: d
Explanation: Any of the above liquids can be used as abrasive carrying medium.
52. If there is an increase in viscosity of slurry, what happens to MRR?
a) Increases
b) Decreases
c) Remains same
d) None of the mentioned
.
Answer: b
Explanation: As viscosity is increased, material removal rate is decreased.
53. How much percent of the abrasives are recommended in general for abrasive medium?
a) 10 – 15 %
b) 15 – 20 %
c) 25 – 30 %
d) 30 – 35 %
.
Answer: d
Explanation: In practice, volumetric concentration of abrasives used range between 30 – 35 %.
54. Machining rate can be affected by the ratio of hardness of tool to that of hardness of work piece.
a) True
b) False
.
Answer: a
Explanation: In USM, Machining rate increases as the mentioned ratio decreases and vice-versa.
55. As the tool area increases, what happens to MRR?
a) Decreases
b) Increases
c) Remains same
d) None of the mentioned
.
Answer: a
Explanation: An increase in tool area distributes grains over the work piece, which reduces the machining rate.
56. When the static pressure of the feed is increases, what happens to MRR?
a) Increases
b) Decreases
c) Increase up to a limiting condition
d) Decrease up to a limiting condition
.
Answer: c
Explanation: As static feed pressure increases, MRR increases up to a limiting condition and then no further increase takes place.
57. What happens to MRR with an increase in tool amplitude?
a) Increases
b) Decreases
c) Remains same
d) None of the mentioned
.
Answer: a
Explanation: As amplitude of the tool increases, rate of material removal increases.
58. The vibration amplitude determines, which parameter of the abrasive particles?
a) Force
b) Torque
c) Velocity
d) Pressure
.
Answer: c
Explanation: Amplitude determines the velocity of abrasive particles between tool and work piece.
59. If splashing occurs, it will result in an increase of material removal rate in USM.
a) True
b) False
.
Answer: b
Explanation: Splashing occurs if amplitude is very high which in turn decreases the material removal rate.
60. Amplitude of the oscillation ranges between which of the following values?
a) 0.01 – 0.04 mm
b) 0.04 – 0.08 mm
c) 0.08 – 0.10 mm
d) 0.10 – 0.20 mm
.
Answer: b
Explanation: Optimum value of the amplitude of the tool will vary between 0.04-0.08 mm.
61. As the vibration frequency increases, what happens to material removal rate?
a) Decreases
b) Increases
c) Increase and then decrease
d) Decrease and then increase
.
Answer: c
Explanation: Up to a certain limit of vibration frequency, MRR increases and after that it decreases.
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61. Which of the following can be used as an abrasive carrying medium?
a) Water
b) Benzene
c) Glycerol
d) All of the mentioned
.
Answer: d
Explanation: Any of the above liquids can be used as abrasive carrying medium.
62. If there is an increase in viscosity of slurry, what happens to MRR?
a) Increases
b) Decreases
c) Remains same
d) None of the mentioned
.
Answer: b
Explanation: As viscosity is increased, material removal rate is decreased.
63. How much percent of the abrasives are recommended in general for abrasive medium?
a) 10 – 15 %
b) 15 – 20 %
c) 25 – 30 %
d) 30 – 35 %
.
Answer: d
Explanation: In practice, volumetric concentration of abrasives used range between 30 – 35 %.
64. Machining rate can be affected by the ratio of hardness of tool to that of hardness of work piece.
a) True
b) False
.
Answer: a
Explanation: In USM, Machining rate increases as the mentioned ratio decreases and vice-versa.
65. As the tool area increases, what happens to MRR?
a) Decreases
b) Increases
c) Remains same
d) None of the mentioned
.
Answer: a
Explanation: An increase in tool area distributes grains over the work piece, which reduces the machining rate.
66. When the static pressure of the feed is increases, what happens to MRR?
a) Increases
b) Decreases
c) Increase up to a limiting condition
d) Decrease up to a limiting condition
.
Answer: c
Explanation: As static feed pressure increases, MRR increases up to a limiting condition and then no further increase takes place.
67. Ultrasonic Machining can be used for which of the following processes and applications?
a) Drilling
b) Sinking and contouring
c) Polishing
d) All of the mentioned
.
Answer: d
Explanation: Ultrasonic Machining can be used for drilling holes, sinking, contouring and many more wide variety of applications.
68. What is the limit of surface area that is to be machined using USM?
a) <100 mm2
b) <500 mm2
c) <1000 mm2
d) <1500 mm2
.
Answer: c
Explanation: If the surface area to be machined is above 1000 mm2, this type of machining will not be apt for the parts.
69. Drilling in Ultrasonic Machining is done, by which motion of the tool?
a) Only rotation
b) Only oscillation
c) Oscillation and rotation
d) None of the mentioned
.
Answer: c
Explanation: The process, which uses USM for drilling, is known as Rotary Ultrasonic Machining (RUM).
70. In which of the following materials, Rotary Ultrasonic Machining can be used to drill holes through them?
a) Glass
b) Alumina
c) Ferrite
d) All of the mentioned
.
Answer: d
Explanation: Rotary Ultrasonic Machining can be used to drill holes in the above mentioned materials.
71. State whether the following statement is true or false.
“Rotary Ultrasonic Machining is the process in which, interrupted drilling of small-diameter holes takes place.”
a) True
b) False
.
Answer: b
Explanation: Rotary Ultrasonic Machining is the process in which, uninterrupted drilling takes place unlike traditional drilling.
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72. On which of the following features of cavity, will the penetration depth depend on?
a) Depth
b) Diameter
c) Size
d) All of the mentioned.
.
Answer: d
Explanation: Penetration rate depends on cavity’s depth and size of the cavity i.e.., area and volume, which can be determined by diameter.
73. What is the value of depth in Ultrasonic sinking, after which, material removal becomes difficult?
a) 1 to 2 mm
b) 2 to 5 mm
c) 5 to 7 mm
d) 7 to 10 mm
.
Answer: c
Explanation: After a depth of 5 to 7 mm, in USM sinking, material removal becomes very difficult.
74. In production of EDM electrodes, typical ultrasonic speeds, in graphite ranges between?
a) 0.01 – 0.10 cm/min
b) 0.10 – 0.25 cm/min
c) 0.25 – 0.40 cm/min
d) 0.40 – 1.40 cm/min
.
Answer: d
Explanation: Typical ultrasonic speeds used are between 0.4 – 1.4 cm/min, used in producing EDM electrodes.
75. How much is the value of surface finished, achieved using Ultrasonic Polishing?
a) 0.1 μm
b) 0.3 μm
c) 0.5 μm
d) 0.7 μm
.
Answer: b
Explanation: Using Ultrasonic Polishing, very low values of surface finish can be obtained, which may be very low as 0.3 μm.
76. In Micro-Ultrasonic Machining, which of the following component vibrates?
a) Tool
b) Work piece
c) Feed pipe
d) All of the mentioned
.
Answer: b
Explanation: Unlike the normal Ultrasonic Machining, Micro-USM utilizes the work piece’s vibration and the rotation of the tool.
77. In Micro-USM, using WC tool, what is the value of diameter can be achieved?
a) 1 μm
b) 3 μm
c) 5 μm
d) 7 μm
.
Answer: c
Explanation: Diameter value up to 5 μm can be achieved, using Micro-ultrasonic machining on glass, silicon and quartz materials.
78. What is the full form of WJM in advanced machining processes?
a) Water Jack Manufacturing
b) Water Jet Machining
c) Water Jet Manufacturing
d) Water Jack Manufacturing
.
Answer: b
Explanation: The full form of WJM is water jet machining in advanced machining processes.
79. What is the key element of water jet machining for material removal?
a) Tool Holder
b) Work piece
c) Water jet
d) Power source
.
Answer: c
Explanation: Water jet is the one, which is used to cut the work piece and to remove material.
80. What is the velocity of the water jet stream in water jet machining?
a) 100 m/sec
b) 300 m/sec
c) 700 m/sec
d) 900 m/sec
.
Answer: d
Explanation: Velocity of water jet stream that is used in Water jet machining is about 900 m/sec.
81. Which of the following is not a part of machining system of Water jet machining?
a) Transducer
b) Accumulator
c) Jet cutting nozzle
d) Hydraulic pump
.
Answer: a
Explanation: Transducer is not a part of Water jet machining and other components come under WJM.
82. What is the general power rating of the hydraulic pump, used in WJM?
a) 10 kW
b) 20 kW
c) 30 kW
d) 40 kW
.
Answer: c
Explanation: The power rating of the motor of hydraulic pump, which is used in WJM is about 30 kW.
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83. Which of the following are the components of intensifier present in water jet machining system?
a) Piston
b) Plunger
c) Limit switch
d) All of the mentioned
.
Answer: d
Explanation: The above mentioned components are present in the intensifier of water jet machining.
84. Intensifier increases the pressure water by which of the following values?
a) 10 – 100 MPa
b) 100 – 200 MPa
c) 200 – 400 MPa
d) 400 – 1000 MPa
.
Answer: c
Explanation: Use of intensifier is to increase the inlet water pressure to 200 – 400 MPa.
85. On which property of water, will the accumulator in Water jet machining rely on?
a) Density
b) Compressibility
c) Viscosity
d) Velocity
.
Answer: b
Explanation: Accumulator relies on compressibility of water (12% at 3800bar), in order to maintain a uniform discharge pressure in WJM.
86. What are the values of typical tube diameters in the machining system in WJM?
a) 0.1 to 1 mm
b) 1 to 6 mm
c) 6 to 14 mm
d) 14 to 25 mm
.
87. What is the expected life of the nozzles used in WJM?
a) 10 hrs
b) 20 hrs
c) 100 hrs
d) 200 hrs
.
Answer: d
Explanation: The life that is expected from the nozzle, which is a part of machining system, is 200 hrs.
88. Which of the following does not damage the nozzle used in Water jet machining?
a) Particles of dirt
b) Mineral deposits
c) Water
d) All of the mentioned
.
Answer: c
Explanation: Only dirt particles and mineral deposits are responsible for damage of nozzle.
89. What are the uses of catcher in machining system of Water jet machining?
a) Collecting dirt
b) Collection of debris
c) Reduce noise levels
d) All of the mentioned
.
Answer: d
Explanation: Catcher in WJM is used to collect the dirt, machined debris and reduce the noise levels.
90. Distance between which components, is the stand-off distance?
a) Nozzle-inlet and work piece top
b) Nozzle-outlet and work piece-top
c) Nozzle-inlet and work piece-bottom
d) Nozzle-outlet and work piece-bottom
.
Answer: b
Explanation: Stand-off distance is the distance between the top of work piece and nozzle outlet.
91. What is the value of diameter of the jet cutting nozzle in WJM?
a) 0.01 – 0.1 mm
b) 0.1 – 0.3 mm
c) 0.3 – 0.7 mm
d) 0.7 – 1.5 mm
.
Answer: b
Explanation: In WJM, diameter of the nozzles range between 0.10 – 0.30 mm.
92. What is the value of stand-off distance in Water jet machining?
a) 0.1 – 1 mm
b) 1 – 2 mm
c) 2 – 6 mm
d) 6 – 14 mm
.
Answer: c
Explanation: Stand-off distance value ranges between 2.5 – 6 mm in Water jet machining.
93. What are the values of jet velocities in Water jet machining?
a) 100 – 200 m/s
b) 200 – 500 m/s
c) 500 – 1500 m/s
d) 1500 – 3000 m/s
.
Answer: c
Explanation: Velocity of the water jet stream ranges between 540 – 1480 m/s in WJM.
94. State whether the following statement is true or false.
“As the pump pressure increases, depth of cut decreases in Water jet machining.”
a) True
b) False
.
Answer: b
Explanation: As the pump pressure is increases, the depth of cut also increases in WJM.
95. What is the value of material thickness of work piece in WJM?
a) 0.001 – 0.25 mm
b) 0.8 – 25 mm
c) 50 – 100 mm
d) 100 – 500 mm
.
Answer: b
Explanation: The material thickness value of work piece range between 0.8 – 25 mm.
96. What is the value of feed rate in Water Jet Machining?
a) 0.0001 – 0.025 m/min
b) 0.05 – 0.25 m/min
c) 0.5 – 200 m/min
d) 200 – 500 m/min
.
Answer: c
Explanation: In Water jet machining, value of the feed rate ranges between 0.5 – 200 m/min.
97. In WJM, what are the properties of jet fluid that affect the MRR?
a) Velocity
b) Flow rate
c) Viscosity
d) All of the mentioned
.
Answer: d
Explanation: All the mentioned properties above, of jet fluid affect the MRR in Water jet machining.
98. Which of the following property/ies of nozzle does not affect the material removal rate in Water jet machining?
a) Material
b) Diameter
c) Outside temperature
d) Stand-off distance
.
Answer: c
Explanation: In the nozzle, outside temperature has no effect on the rate of material removal.
99. In the following materials, Water jet machining can be used on which type of material?
a) Metals
b) Plastics
c) Ceramics
d) All of the mentioned
.
Answer: d
Explanation: WJM can be used on metals, cloth, paper, plastics, food, leather, and ceramics.
100. What are the processes and applications, where Water jet machining can be used?
a) Cutting
b) Drilling
c) Deburring
d) All of the mentioned
.
Answer: d
Explanation: Water jet machining can be used for drilling, cutting, deburring, surface treatment and many more applications.
101. What is the tolerance limit range of thin materials in WJM?
a) ± 0.1 mm
b) ± 10 mm
c) ± 25 mm
d) ± 50 mm
.
Answer: c
Explanation: In Water jet machining, the range of tolerance is ± 25 mm.
102. In cutting of rocks using water jet machining, which type of pressure is needed?
a) Low pressure
b) Medium pressure
c) High pressure
d) None of the mentioned
.
Answer: c
Explanation: In WJM, very high pressures and velocities are needed while cutting rocks.
103. In deburring, which combination removes the material from non-metallic materials?
a) High pressure and low flow rate
b) High pressure and high flow rate
c) Low pressure and low flow rate
d) Low pressure and high flow rate
.
Answer: a
Explanation: For non-metallic materials high pressure and lower flow rates are used in deburring.
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104. Which of the following materials has some drawbacks of cutting WJM?
a) Food
b) Rocks
c) Fibre-reinforced plastics
d) None of the mentioned
.
Answer: c
Explanation: Water gets deflected due to the fibre embedded in the matrix of fibre-reinforced plastics when we use WJM.
106. What is the accuracy level obtained when PCB’s are cut by WJM?
a) ± 0.05 mm
b) ± 0.13 mm
c) ± 0.26 mm
d) ± 0.33 mm
.
Answer: b
Explanation: In WJM, accuracy obtained in cutting of PCB’s is ± 0.13 mm.
107. In WJM, surface treatment includes which type of processes?
a) Removing deposits
b) Removing chemicals
c) Degreasing
d) All of the mentioned
.
Answer: d
Explanation: Surface treatment is done using WJM to clean the surface from many toxic chemical, deposits, residues etc
108. In how many directions, can the cutting takes place in Water jet machining?
a) Uni-directional
b) Bi-directional
c) Multi-directional
d) None of the mentioned
.
Answer: c
Explanation: Water jet machining has multi directional cutting capacity i.e.., in any direction in three dimensional space.
109. In Water jet machining, cuts can be started at which place of workpiece?
a) From left
b) From right
c) From middle
d) From any point
.
Answer: d
Explanation: In WJM, cuts can be started from any point on the workpiece.
110. State whether the following statement is true or false.
“To start the cuts in Water jet machining, pre-drilled holes are not necessary.”
a) True
b) False
.
Answer: b
Explanation: In Water jet machining, we need not require any pre-drilled holes to start the cuts.
111. Which of the following is not an advantage of Water jet machining?
a) Burr produced is minimal
b) No Heat is produced
c) Relatively low hourly rates
d) Environmentally safe
.
Answer: c
Explanation: Costs per hour are relatively high in Water jet machining.
112. In Water jet machining, tool need not require sharpening once the machining is done.
a) True
b) False
.
Answer: a
Explanation: Tool does not wear in water jet machining, so it need not be sharpened.
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113. Which of the following secondary processes are eliminated in Water jet machining?
a) Grinding of surface
b) Surface treatment
c) Polishing of surface
d) All of the mentioned
.
Answer: d
Explanation: All the mentioned secondary processes above, are eliminated in Water jet machining.
114. How many parts are cut using Water jet machining, on a single blank?
a) One part
b) Two parts
c) Three parts
d) Multiple parts
.
Answer: d
Explanation: Depending up on the kerf width, multiple parts can be machined using a single blank.
115. Which of the following is the disadvantage of water jet machining?
a) Narrow kerf width
b) Small diameter of nozzle
c) Not suitable for mass production
d) Burr is minimal
.
Answer: c
Explanation: Due to high maintenance, WJM cannot be used for mass production.
116. In advanced machining processes, what is the full form of AJM?
a) Automatic Jet Manufacturing
b) Abrasive Jet Machining
c) Automated Jet Machining
d) Abrasive Jet Manufacturing
.
Answer: b
Explanation: In advanced machining processes, full form of AJM is Abrasive jet machining.
117. In AJM, which of the following materials are used as abrasive grains?
a) Al2O3
b) SiC
c) Glass beads
d) All of the mentioned
.
Answer: d
Explanation: In Abrasive jet machining, any of the particles mentioned above can be used as abrasive grains.
118. In Abrasive jet machining, work piece material of removed by which of the following means?
a) Vaporization
b) Electro plating
c) Mechanical abrasion
d) Corrosion
.
Answer: c
Explanation: Abrasive particles hit the surface with high pressure and high velocities, which removes the material.
119. Which type of materials can be machined using Abrasive jet machining?
a) Glass
b) Ceramics
c) Hard materials
d) All of the mentioned
.
Answer: d
Explanation: Materials like ceramics, glass, hard and super hard materials can be machined using Abrasive jet machining.
120. In machining system of AJM, which is the medium of carrying the abrasive grains for machining?
a) Liquids
b) Gases
c) Any fluids
d) None of the mentioned
.
Answer: b
Explanation: In AJM, different types of gases are used as the medium for carrying abrasives.
121. In machining system of AJM, what is/are the gas/es used for carrying the abrasives?
a) CO2
b) Air
c) Nitrogen
d) All of the mentioned
.
Answer: d
Explanation: In AJM, gases like CO2, air or nitrogen are used to carry the abrasives.
122. What is the pressure of gas that is to be supplied, for carrying the abrasives?
a) 0.1 to 1.0 kg/cm2
b) 2.0 to 8.0 kg /cm2
c) 10.0 to 18.0 kg/cm2
d) 25.0 to 35.5 kg/cm2
.
Answer: b
Explanation: The pressure of the carrying gas should range between 2 to 8 kg/cm2.
123. Which of the following gas, should never be used as the carrier of abrasives?
a) Nitrogen
b) CO2
c) Oxygen
d) Air
.
Answer: c
Explanation: Oxygen should not be used as carrier because it causes a violent chemical reaction with abrasives or work piece.
124. What is the frequency of mixing chamber, consisting of gas and abrasives?
a) 10 Hz
b) 30 Hz
c) 50 Hz
d) 70 Hz
.
Answer: c
Explanation: Mixing chamber consisting of carrier gas and the abrasive grains, vibrates at a frequency of 50 Hz.
125. In Abrasive jet machining, what may be the size of the abrasive grains used?
a) 10 – 40 µm
b) 50 – 100 µm
c) 100 – 150 µm
d) 200 – 300 µm
.
Answer: a
Explanation: Abrasive grains of size, between 10 – 40 µm can be used for machining.
126. What are the processes where Abrasive jet machining can be used?
a) Cleaning
b) Cutting
c) Deburring
d) All of the mentioned
.
Answer: d
Explanation: Abrasive jet machining can be used for deburring, cutting, cleaning and for many other heavy duty applications.
127. State whether the following statement is true or false.
“In Abrasive jet machining, commercial grades powders can be used for machining.”
a) True
b) False
.
Answer: b
Explanation: For AJM, commercial grade powders are not used because their sizes are not classified widely.
128. In machining system of AJM, which of the following controls the relative motion between work piece and nozzle?
a) Cam drives
b) Pantographs
c) Trace mechanisms
d) All of the mentioned
.
Answer: d
Explanation: Relative motion in Abrasive jet machining can be controlled by the above mentioned means.
129. Masks, which are used to confine the jet stream location on work piece are made of, which type of materials?
a) Copper
b) Glass
c) Rubber
d) All of the mentioned
.
Answer: d
Explanation: Masks can be made of any of the above-mentioned materials.
130. In AJM, what is the mechanism of removal of material from the work piece?
a) Corrosion
b) Abrasion
c) Electron transfer
d) Vaporization
.
Answer: b
Explanation: In Abrasive jet machining, the removal of material takes places by mechanical abrasion, using abrasive grains.
131. In AJM, abrasive jet from the nozzle follows, which type of path for a short distance?
a) Parallel
b) Inclined
c) Perpendicular
d) None of the mentioned
.
Answer: a
Explanation: Abrasive particles follow a parallel path for short distance and then flare outward.
132. Which of the following components, influence the material removal rate in Abrasive jet machining?
a) Nozzle
b) Carrier gas
c) Abrasive grains
d) All of the mentioned
.
Answer: d
Explanation: All the components mentioned above, influence the rate of material removal, directly or indirectly.
133. In the following properties of nozzle, which of them does not influence the MRR?
a) Size
b) Wear
c) Outside temperature
d) Distance from work piece
.
Answer: c
Explanation: The outside temperature of nozzle has no influence on the material removal rate.
134. In the following properties of abrasive grains, which of them changes rate of material removal?
a) Size
b) Strength
c) Shape
d) All of the mentioned
.
Answer: d
Explanation: The above mentioned properties of abrasive grains influence the material removal rate.
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135. As the abrasive flow rate increases, what happens to the volumetric removal rate?
a) Increases
b) Decreases
c) Increase and then decrease
d) Decrease and then increase
.
Answer: c
Explanation: In AJM, volumetric removal rate increases up to a level and then decreases.
136. What is the value of abrasive grain flow rate in Abrasive jet machining?
a) 0.1 – 2 g/min
b) 3 – 20 g/min
c) 30 – 56 g/min
d) 68 – 85 g/min
.
Answer: b
Explanation: Abrasive grain flow rate is between 3 – 20 g/min, in AJM.
137. What must be the velocity of the carrier gas that carries the abrasive particles?
a) 10 – 50 m/sec
b) 50 – 150 m/sec
c) 150 –300 m/sec
d) 300 – 500 m/sec
.
Answer: c
Explanation: Velocity of abrasive carrier gas must be between 150 – 300 m/sec.
138. What is the value of carrier gas flow rate in Abrasive jet machining?
a) 6 L/min
b) 17 L/min
c) 28 L/min
d) 39 L/min
.
Answer: c
Explanation: In Abrasive jet machining, the flow rate of abrasive carrier gas is around 28 L/min.
139. Which of the following material/s cannot be used for making of nozzle in Abrasive jet machining?
a) Tungsten Carbide
b) Steel alloy
c) Sapphire
d) Synthetic sapphire
.
Answer: b
Explanation: Nozzle in Abrasive jet machining is made up of sapphire or WC.
140. Which of the following values, does the diameter of the nozzle lies between?
a) 0.01 – 0.10 mm
b) 0.30 – 0.50 mm
c) 0.70 – 0.90 mm
d) 1.10 – 1.50 mm
.
Answer: b
Explanation: In AJM, Diameter of the nozzle ranges between 0.30 – 0.50 mm.
141. What is the life of Tungsten carbide material nozzle?
a) 1 – 8 hrs
b) 2 – 5 hrs
c) 10 – 15 hrs
d) 25 – 40 hrs
.
Answer: c
Explanation: Nozzle made up of WC material has a life period which range between 10 – 15 hrs.
142. In AJM, what is the life of synthetic sapphire material nozzle?
a) 100 hrs
b) 300 hrs
c) 500 hrs
d) 700 hrs
.
Answer: b
Explanation: Nozzle made up of synthetic sapphire material has a life period which is about 300 hrs.
143. What are the tolerance limit values in Abrasive water jet machining?
a) ± 0.01 mm
b) ± 0.03 mm
c) ± 0.05 mm
d) ± 0.07 mm
.
Answer: c
Explanation: In Abrasive jet machining, tolerance limit values range between ± 0.05 mm.
144. In AJM, surface roughness value will vary between which values?
a) 0.01 – 0.10 µm
b) 0.15 – 1.5 µm
c) 2.0 – 5.0 µm
d) 7.0 – 10.0 µm
.
Answer: b
Explanation: Surface roughness value in AJM varies between 0.15 – 1.5 µm, depending on grain size.
145. Which of the following, are the processes and applications in which Abrasive jet machining can be applied?
a) Drilling
b) Cutting
c) Deburring
d) All of the mentioned
.
Answer: d
Explanation: Abrasive jet machining can be used for cutting, drilling, deburring and cleaning processes.
146. Using abrasive jet machining, wire cleaning and insulation stripping take place without affecting the conductor.
a) True
b) False
.
Answer: a
Explanation: Without affecting the conductor, both stripping and cleaning are done, by using Abrasive jet machining.
147. In Abrasive jet machining, intricate shapes and holes are machined on which type of materials?
a) Brittle
b) Thin
c) Difficult to machine
d) All of the mentioned
.
Answer: d
Explanation: Abrasive jet machining is used to machine, intricate shapes and holes in brittle, thin and difficult to machine materials.
148. State whether the following statement is true or false, about Abrasive jet machining.
“Using Abrasive jet machining, micro deburring of hypodermic needles can take place.”
a) True
b) False
.
Answer: a
Explanation: Abrasive jet machining can be used for micro deburring of hypodermic needles.
149. What are the type of materials that can be machined using Abrasive jet machining?
a) Glass
b) Sapphire
c) Quartz
d) All of the mentioned
.
Answer: d
Explanation: In Abrasive jet machining, the above mentioned materials can be machined, which are heat sensitive and brittle.
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150. What is the amount of material utilizes when we machine parts using Abrasive jet machining?
a) Very low
b) Low
c) Medium
d) High
.
Answer: d
Explanation: In Abrasive jet machining, material utilization is very high since it removes material by using abrasives.
151. After how much time tool has to be changed in AJM?
a) 1 hr
b) 2 hrs
c) 5 hrs
d) No tool change required
.
Answer: d
Explanation: In Abrasive jet machining, tool changes are not required.
152. By using Abrasive jet machining, how much amount of hardening does the materials experience?
a) No hardening
b) Very less hardening
c) Average hardening
d) High hardening
.
Answer: a
Explanation: In Abrasive jet machining, hardening is not experienced by the machined materials.
153. Which type of materials cannot be machined using Abrasive jet machining?
a) Soft materials
b) Hard materials
c) Difficult to machine materials
d) None of the mentioned
.
Answer: a
Explanation: Soft materials such as candy bars, thin softwood etc.., cannot be machined using AJM.
154. Which of the following materials in Abrasive jet machining can be a health hazard?
a) Abrasive grains
b) Air carrier
c) Silica dust
d) None of the mentioned
.
Answer: c
Explanation: Silica dust, that occurs after machining can be a health hazard in AJM.
155. In AJM, air filters are used to remove which of the following?
a) Moisture
b) Oil
c) Other dust particles
d) All of the mentioned
.
Answer: d
Explanation: Before machining, air has to be filtered to remove dust, moisture and oil in the machining system.
156. In advanced machining processes, what is the full form of AWJM?
a) Automated Water Jet Machining
b) Automated Water Jet Manufacturing
c) Abrasive Water Jet Machining
d) Abrasive Water Jet Manufacturing
.
Answer: c
Explanation: Full form of AWJM is Abrasive Water Jet Machining.
157. What are all the types of materials, which can be machined using AWJM?
a) Glass
b) Ceramics
c) Concrete
d) All of the mentioned
.
Answer: d
Explanation: Hard to cut materials, which are mentioned above, can be machined using Abrasive water jet machining.
158. When was Abrasive water jet machining developed first?
a) 1942
b) 1958
c) 1974
d) 1980
.
Answer: c
Explanation: Abrasive water jet machining was first developed in the year 1974.
159. When compared to the conventional machining, how much times faster, is the Abrasive water jet machining?
a) 5 times
b) 10 times
c) 15 times
d) 20 times
.
Answer: b
Explanation: Abrasive water jet machining is 10 times faster than the conventional machining.
160. What is the percentage of the abrasives and water in the mixture?
a) 20% water and 80% abrasives
b) 80% water and 20% abrasives
c) 30% water and 70% abrasives
d) 70% water and 30% abrasives
.
Answer: d
Explanation: Abrasive mixture consists of 70 percent water and 30 percent abrasives.
161. What are the materials used for abrasives in Abrasive water jet machining?
a) SiC
b) Corundum
c) Glass beads
d) All of the mentioned
.
162. In the machining system of AWJM, which one accelerates the abrasives to remove material?
a) Water only
b) Water jet stream
c) Feeder
d) None of the mentioned
.
Answer: b
Explanation: Water jet stream accelerates abrasives but not the water only, to remove material.
163. The introduction of compressed air to the water jet enhances the deburring action.
a) True
b) False
.
Answer: a
Explanation: Compressed air increases the pressure energy of the jet stream, which enhances the material removal rate.
164. What is the grain size of abrasive particles, which are often used for Abrasive water jet machining?
a) 0.01 – 0.50 µm
b) 10 – 150 µm
c) 200 – 500 µm
d) 500 – 1000 µm
.
Answer: b
Explanation: Grain size of the abrasive particles range between 10 – 150 µm in Abrasive water jet machining.
165. How is the material removed in Abrasive water jet machining?
a) Vaporization
b) Electron transfer
c) Corrosion
d) Erosion
.
Answer: d
Explanation: In Abrasive water jet machining, material removal takes place by the erosion of the work piece material using abrasives accelerated by jet stream.
166. Which of the following is not the feed mechanism of the abrasives in AWJM?
a) Side feed
b) Cross feed
c) Central feed
d) All of the mentioned
.
Answer: b
Explanation: Only side feed and central feed are used in Abrasive water jet machining.
167. In Abrasive water jet machining, how are the abrasives fed into the water jet stream?
a) Suspension
b) Injection
c) All of the mentioned
d) None of the mentioned
.
Answer: c
Explanation: Abrasives are fed into the water jet stream through suspension or injection.
168. What is the use of delivery system in the machining system of AWJM?
a) To deliver colloidal solution
b) To pump water
c) To fed abrasives
d) None of the mentioned
.
Answer: b
Explanation: In Abrasive water jet machining, water delivery system is used.
169. Of the following components, which one does not come under the machining system of AWJM?
a) Water delivery system
b) Transducer
c) Cutting nozzles
d) Mixing chambers
.
Answer: b
Explanation: Transducer is the component which does not come under the machining system of AWJM.
170. In Abrasive water jet machining, intensifier is used to deliver which type of pressure?
a) Very low pressure
b) Low pressure
c) Medium pressure
d) High pressure
.
Answer: d
Explanation: In AWJM, intensifier is used to deliver high pressure water using pistons with it.
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171. In mixing chamber of AWJM, which of the following are mixed?
a) Abrasives and colloidal solution
b) Abrasives and water jet
c) Colloidal and water jet
d) None of the mentioned
.
Answer: b
Explanation: In mixing chamber, abrasives and water jet stream are mixed.
172. Of the following, which one is a type of suspension in AWJM?
a) Direct pumping
b) Indirect pumping
c) Bypass pumping
d) All of the mentioned
.
Answer: d
Explanation: There are three different types of suspension AWJ formed by indirect, direct and bypass pumping.
173. In machining system of AWJM, mixing chamber is immediately followed by which of the following component?
a) Focusing tube
b) Cutting Nozzle
c) Intensifier
d) Water delivery
.
Answer: a
Explanation: In Abrasive water jet machining, mixing chamber is immediately followed by the focusing tube.
174. Which of the following energies are absorbed using the catchers in Abrasive water jet machining?
a) Pressure energy
b) Kinetic energy of abrasives
c) Residual energy
d) All of the mentioned
.
Answer: c
Explanation: In AWJM, catchers are used to absorb the residual energy.
175. Which of the following are different types of catchers used in AWJM?
a) Water basin type
b) Submerged steel balls type
c) TiB2 type
d) All of the mentioned
.
Answer: d
Explanation: The above mentioned types are the types of catchers used in AWJM.
176. Which of the following is not a process parameter of Abrasive water jet machining?
a) Frequency of vibration
b) Orifice diameter
c) Pressure
d) Stand-off distance
.
Answer: a
Explanation: Frequency of the vibrations does not belong to the parameters of Abrasive water jet machining.
177. Which of the following come under the process parameters of the Abrasive water jet machining?
a) Abrasive size
b) Machine impact angle
c) Traverse speed
d) All of the mentioned
.
Answer: d
Explanation: All the parameters mentioned above come under Abrasive water jet machining.
178. What is the value of orifice diameter in Abrasive water jet machining?
a) 0.01 – 0.03 mm
b) 0.03 – 0.09 mm
c) 0.10 – 0.30 mm
d) 0.30 – 0.90 mm
.
Answer: c
Explanation: The value of diameter of the orifice should range between 0.10 – 0.30 mm.
179. Of the following values, between which of them pressure value will range?
a) 1000 – 1500 bar
b) 1500 – 2500 bar
c) 2500 – 4000 bar
d) 4000 – 10000 bar
.
Answer: c
Explanation: In Abrasive water jet machining, pressure value will range between 2500 – 4000 bar.
180. When compared to sand, how much effective is garnet as abrasive material in AWJM?
a) 20%
b) 30%
c) 40%
d) 50%
.
Answer: b
Explanation: Garnet, which is commonly used abrasive material is nearly 30% more effective than sand in Abrasive water jet machining.
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181. State whether the following statement is true or false about Abrasive water jet machining.
“A material, whose material removal rate is higher, produces larger surface roughness.”
a) True
b) False
.
Answer: a
Explanation: As rate of material removal increases in AWJM, large surface roughness are produced.
182. Surface roughness depends on which of the following parameters in Abrasive water jet machining?
a) Work piece material
b) Grit size
c) Abrasive type
d) All of the mentioned
.
Answer: d
Explanation: All the parameters mentioned above, are responsible for variation in surface roughness.
183. What is the value of focusing diameter in Abrasive water jet machining?
a) 0.1 – 0.6 mm
b) 0.8 – 1.4 mm
c) 1.6 – 2.8 mm
d) 3.2 – 5.2 mm
.
Answer: b
Explanation: Diameter value of WC focusing tube in AWJM varies between 0.8 – 1.4 mm.
184. Abrasive flow value in Abrasive water jet machining will range between which of the following values?
a) 0.01 – 0.1 kg/min
b) 0.1 – 1.0 kg/min
c) 1.0 – 10 kg/min
d) 10 – 100 kg/min
.
Answer: b
Explanation: In AWJM, abrasive flow ranges between 0.1 – 1.0 kg/min.
185. What is the value of stand-off distance in Abrasive water jet machining?
a) 1.0 – 2.0 mm
b) 2.0 – 4.0 mm
c) 4.0 – 6.0 mm
d) 6.0 – 10.0 mm
.
186. Impact angle in Abrasive water jet machining range between which of the following values?
a) 0° to 10°
b) 10° to 30°
c) 30° to 90°
d) 90° to 100°
.
Answer: c
Explanation: Machine impact angle in AWJM will range between 30° to 90°.
187. Of the following values, between which values traverse speed will range?
a) 0.1 to 5 m/min
b) 5 to 100 m/min
c) 100 to 500 m/min
d) 500 to 1000 m/min
.
Answer: b
Explanation: Value of traverse speed ranges between 5 to 100 m/min.
188. Depth of cut values in Abrasive water jet machining ranges between which values?
a) 0.01 to 2 mm
b) 2 to 250 mm
c) 300 to 500 mm
d) 650 to 900 mm
.
Answer: b
Explanation: The value of depth of cut in AWJM ranges between 2 to 250 mm.
189. In the existing advanced machining processes, what is the full form of IJM?
a) Ice Jet Manufacturing
b) Ink Jet Manufacturing
c) Ice Jet Machining
d) Ink Jet Machining
.
Answer: c
Explanation: Full form of IJM is Ice jet machining in advanced machining processes.
190. In Ice jet machining, the abrasive particles used for material removal are replaced by which of the following?
a) Silica particles
b) Ice particles
c) Fluids
d) Colloidal solutions
.
Answer: b
Explanation: In Ice jet machining, the abrasive particles are replaced by ice particles.
191. When compared to Abrasive water jet machining, how are the material removal rates in Ice jet machining?
a) Very low
b) Low
c) High
d) Remains same
.
Answer: b
Explanation: In Ice jet machining, material removal rates are relatively low when compared to AWJM.
192. State whether the following statement is true or false about Ice jet machining.
“Water can be reused in IJM, unlike that of AWJM and WJM.”
a) True
b) False
.
Answer: a
Explanation: Unlike that of AWJM, water can be reused in Ice jet machining.
193. Which of the following are the components of machining system of IJM?
a) High pressure pump
b) Ice particle generator
c) Ultrasonic Atomizer
d) All of the mentioned
.
Answer: d
Explanation: All the components mentioned above are present in the machining system of IJM.
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194. Which of the following component will be present just after the cooling coil?
a) High pressure pump
b) Ice particle generator
c) Cutting nozzle
d) Ultrasonic Atomizer
.
Answer: c
Explanation: Prior to nozzle water is cooled by coils that is submerged in liquid nitrogen.
195. Ice particles of size <500 µm are produced by which of the following process?
a) Stream freezing
b) Ice particles supply
c) Normal cooling
d) None of the mentioned
.
Answer: a
Explanation: Ice particles of size <500 µm are produced by using stream freezing. 196. Ice particles of size >500 µm are produced by which of the following process?
a) Stream freezing
b) Ice particles supply
c) Normal cooling
d) None of the mentioned
.
Answer: b
Explanation: Ice particles of size >500 µm are produced by ice particles supply.
197. In Ice jet machining, stand-off distance value varies between which of the following?
a) 1.0 – 2.0 mm
b) 2.0 – 3.0 mm
c) 3.0 – 5.0 mm
d) 5.0 – 10.0 mm
.
Answer: c
Explanation: Value of the stand-off distance ranges between 3.0 – 5.0 mm in IJM.
198. What is the value of diameter of nozzle that is used in Ice jet machining?
a) 0.175 mm
b) 0.425 mm
c) 0.548 mm
d) 0.654 mm
.
Answer: a
Explanation: The value of diameter of nozzle in Ice jet machining is about 0.175 mm.
199. Ultrasonic atomizer used in ice particle generator, produces water droplets at which rate?
a) 0.1 ltr/hr to 1 ltr/hr
b) 2 ltr/hr to 12 ltr/hr
c) 20 ltr/hr to 35 ltr/hr
d) 40 ltr/hr to 65 ltr/hr
.
Answer: b
Explanation: Atomizer produces droplets at the rate 2 ltr/hr to 12 ltr/hr.
200. What are the advantages of Ice jet machining over the other advanced machining processes?
a) Environmentally safe
b) Cost reduction
c) No heat affected zone
d) All of the mentioned
.
Answer: d
Explanation: Advantages of Ice Jet Machining are mentioned above when compared to other processes.
201. Which of the following is a disadvantage of ice jet machining when compared to AWJM?
a) Environmentally safe
b) Cost reduction
c) Low material removal rate
d) No heat affected zone
.
Answer: c
Explanation: When compared to AWJM, IJM has lower material removal rates.
202. Which of the following are the processes and applications by the use of IJM?
a) Ice Deburring process
b) Ice Cutting process
c) Ice Blasting process
d) All of the mentioned
.
Answer: d
Explanation: All the processes mentioned above are done by using IJM.
203. Which of the following industries use Ice jet machining for different applications?
a) Food industry
b) Medical industry
c) Space industry
d) All of the mentioned
.
Answer: d
Explanation: Different type of industries mentioned above use Ice jet machining for wide variety of applications.
204. In this type of machining, machining forces are controlled by which of the following fields?
a) Magnetic field
b) Electric field
c) Radiative field
d) None of the mentioned
.
Answer: a
Explanation: In this machining, the magnetic field controls all the major forces of machining.
205. Which of the following type of tools, are required for magnetic field assisted polishing?
a) Rigid tools
b) Expensive tools
c) Magnetic tools
d) Ultra precession tools
.
Answer: c
Explanation: Magnetic field assisted polishing requires only magnetic machining elements, for the purpose of machining.
206. Which of the following is not a magnetic field assisted machining process?
a) Electro-plating process
b) Magnetic abrasive finishing
c) Magnetic float polishing
d) All of the mentioned
.
Answer: a
Explanation: There are only two types of magnetic field assisted polishing: Magnetic abrasive machining and Magnetic float polishing.
207. In the advanced machining processes, what is the full form of MAF?
a) Magnet Automated Finishing
b) Magnetic Abrasive Finishing
c) Magnet Assisted Floating
d) Magnetic Association for Floating
.
Answer: b
Explanation: In advanced machining processes, full form of MAF is Magnetic Abrasive Finishing.
208. In Magnetic abrasive finishing, which of the following particles do not contribute to the material removal?
a) Abrasive particles
b) Magnetic particles
c) Non-magnetic particles
d) All of the mentioned
.
Answer: c
Explanation: Material is removed by colloidal dispersion of the magnetic particles in abrasive particles.
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209. Which of the following motions are opted, in order to carry on with the Magnetic abrasive finishing?
a) Rotary motion
b) Oscillatory motion
c) Vibratory motion
d) All of the mentioned
.
Answer: d
Explanation: All the motions mentioned above, are needed for machining parts in MAF.
210. Magnetic Abrasive finishing is used for which of the following application/s?
a) Surface finishing
b) Cutting
c) Drilling
d) Boring
.
Answer: a
Explanation: Magnetic abrasive finishing is a process, which is opted for finishing of parts that are already machined on the other machines.
211. Which is the place, where Magnetic field assisted polishing was invented?
a) The United States of America
b) The United Arab Emirates
c) Union of Soviet Socialist Republics
d) Japan
.
Answer: a
Explanation: Magnetic field assisted polishing was invented in the United States of America.
212. Which of the following processes cannot be machined using Magnetic abrasive finishing?
a) Surface finishing
b) Surface polishing
c) Hole Drilling
d) None of the mentioned
.
Answer: c
Explanation: Holes drilling is one of the processes that cannot be done using Magnetic Abrasive Finishing.
213. Which of the following components, come under the machining system of Magnetic Abrasive finishing?
a) Rotatory spindle
b) Oscillating Magnets
c) Holding chuck
d) All of the mentioned
.
Answer: d
Explanation: The components, which are mentioned above come under machining system of Magnetic Abrasive Finishing.
214. Which of the following materials can be machined using Magnetic Abrasive finishing?
a) Alloy steels
b) Ceramic materials
c) Iron materials
d) All of the mentioned
.
Answer: d
Explanation: Magnetic abrasive finishing is a process which is used for different materials, magnetic and nonmagnetic.
215. State whether the following statement is true or false about Magnetic abrasive finishing.
“Vibratory motion that is axial, is introduced in the magnetic field by the oscillation of magnetic poles.”
a) True
b) False
.
Answer: a
Explanation: Axially vibrating motion is required for machining in MAF.
216. Which of the following material/s is/are used to hold the abrasives, in MAF?
a) Nonmagnetic materials
b) Ferro magnetic materials
c) Ceramic materials
d) None of the mentioned
.
Answer: b
Explanation: Ferro magnetic materials hold the abrasives in order to remove material through finishing.
217. What is the other name of ferromagnetic material used for holding the abrasives in MAF?
a) Magnetic abrasive conglomerate
b) Magnetic abrasive holder
c) Magnetic abrasive container
d) Magnetic abrasive ampule
.
Answer: a
Explanation: Ferro magnetic material is also called as Magnetic abrasive conglomerate.
218. What are the sizes magnetic abrasive conglomerates required in the machining system of MAF?
a) 1 – 10 microns
b) 20 – 50 microns
c) 50 – 100 microns
d) 100 – 200 microns
.
Answer: c
Explanation: The sizes of magnetic abrasive conglomerates range between 50 – 100 microns.
219. What are the size ranges of the abrasives used in Magnetic abrasive finishing?
a) 0.1 to 1 microns
b) 1 to 10 microns
c) 10 to 100 microns
d) 100 to 1000 microns
.
Answer: b
Explanation: The size of abrasives used for finishing range between 1 to 10 microns.
220. Which of the following are commonly used magnetic materials in finishing process?
a) Iron and iron oxides
b) Nickel and cobalt
c) Steel and stainless steel
d) All of the mentioned
.
Answer: d
Explanation: All the materials mentioned above, are commonly used magnetic materials.
221. Which of the following are commonly used abrasive materials in finishing process of MAF?
a) Silicon Carbide
b) Aluminium Oxide
c) Cubic Boron Nitride
d) All of the mentioned
.
Answer: d
Explanation: All the materials mentioned above, are used as abrasives in Magnetic abrasive finishing process.
222. Which of the following materials combine to form the magnetic abrasive brush in MAF?
a) Work piece
b) Magnetic and abrasive particles
c) Magnets
d) All of the mentioned
.
Answer: d
Explanation: All the materials mentioned above, combine to form the magnetic abrasive brush.
223. In order to achieve uniform circulation of abrasives, the magnetic abrasives are undergone through which of the following?
a) Stirring
b) Oscillation
c) Vibration
d) All of the mentioned
.
Answer: a
Explanation: To achieve uniform circulation of abrasives, the abrasives are undergone thorough stirring.
224. Magnetic lines of force flows on which part of the work piece material?
a) Through the work piece
b) Over the surface
c) Above the work piece
d) Below the work piece
.
Answer: a
Explanation: Magnetic lines of force flow through the work piece.
225. What is the limit of the roller speed used in MAF?
a) Up to 0.5 m/s
b) Up to 1.3 m/s
c) Up to 2.6 m/s
d) Up to 3.3 m/s
.
Answer: b
Explanation: Roller speed used can be up to 1.3 m/s.
226. What is the value of magnetic field intensity used in MAF?
a) 0 – 0.53 Tesla
b) 0.6 – 0.70 Tesla
c) 0.70 – 0.90 Tesla
d) 0.90 – 1.1 Tesla
.
Answer: a
Explanation: Value of the magnetic field intensity used in MAF range between 0 – 0.53 Tesla.
228. What is the value of magnetic pressure used in Magnetic abrasive machining?
a) 0 – 30 kPa
b) 50 – 100 kPa
c) 100 – 200 kPa
d) 200 – 500 kPa
.
Answer: a
Explanation: In Magnetic abrasive finishing, value of magnetic pressure ranges between 0 – 30 kPa.
229. What is the value of frequency used in Magnetic abrasive finishing process?
a) 1 – 10 Hz
b) 12 – 25 Hz
c) 30 – 50 Hz
d) 60 – 100 Hz
.
Answer: b
Explanation: In MAF process, value of the frequencies used range between 12 – 25 Hz.
230. In which direction, oscillatory motion of magnets are carried out?
a) Axial to work piece
b) Perpendicular to work piece
c) Inclined to work piece
d) None of the mentioned
.
Answer: a
Explanation: Axial oscillation motion of magnets takes with respect to work piece.
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231. Which of the following surface defects are removed using Magnetic abrasive finishing?
a) Scratches
b) Hard spots
c) Lay lines and tool marks
d) All of the mentioned
.
Answer: d
Explanation: All the surface defects mentioned above, can be removed using Magnetic abrasive finishing.
232. What is the value of the limited depth to which form errors, tapers, looping can be corrected?
a) 10 microns
b) 20 microns
c) 30 microns
d) 40 microns
.
Answer: b
Explanation: Form errors, tapers, looping etc.., can be corrected up to a limited depth of 20 microns.
233. State whether the following statement is true or false about magnetic abrasive finishing.
“Increasing the magnetic flux density raises the rate of material removal in finishing.”
a) True
b) False
.
Answer: a
Explanation: In MAF, as the magnetic flux density increases, material removal rate increases.
234. Which of the following factors, does material removal rate depend on?
a) Magnetic flux density
b) Working clearance
c) Work piece material
d) All of the mentioned
.
Answer: d
Explanation: All the factors mentioned above, are responsible for change in material removal rate.
235. Which of the following factors does not affect the magnetic abrasive conglomerates in MAF?
a) Abrasive type
b) Abrasive size
c) Work piece material
d) Volume fraction
.
Answer: c
Explanation: In Magnetic abrasive finishing, work piece material has no effect on magnetic abrasive conglomerates.
236. State whether the following statement is true or false about Magnetic abrasive finishing.
“Higher rates of material removal are obtained, with an increase in amplitude and frequency.”
a) True
b) False
.
Answer: a
Explanation: As the amplitude and frequency increases, the rate of material removal increases.
237. Which of the following applications where MAF is used?
a) Finishing of inner surfaces
b) Polishing of balls and rollers
c) Chamfering and deburring of gears
d) All of the mentioned
.
Answer: d
Explanation: All the applications mentioned above can be fulfilled using MAF.
238. Diamond abrasives used for finishing operation results in which type of surface defects?
a) Deep pits
b) Surface scratches
c) Micro cracks
d) All of the mentioned
.
Answer: d
Explanation: All the defects mentioned above occur, when we use diamond abrasives for material removal.
239. Which of the following conditions is/are not suitable for finishing of ceramic balls?
a) Controlled force
b) Large abrasive sizes
c) Small abrasive sizes
d) Less harder abrasives
.
Answer: b
Explanation: For a better finish, controlled force, fine and less hard abrasives are required.
240. In MAF, ceramic balls and the bearing rollers are placed in between which components?
a) Abrasives and float
b) Drive shaft and float
c) Float and magnets
d) Magnets and abrasives
.
Answer: b
Explanation: Ceramic balls are placed in between drive shaft and float.
241. Polishing in Magnetic abrasive finishing is done, by which action of material removal?
a) Mechanical abrasion
b) Mechanical erosion
c) Chemical corrosion
d) Material vaporization
.
Answer: a
Explanation: Abrasives are used for the polishing and finishing operations of the parts, in Magnetic abrasive finishing.
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242. State whether the following statement is true or false regarding MAF.
“As the forces exerted on the rollers are very small, polishing actions takes place very finely.”
a) True
b) False
.
Answer: a
Explanation: Since the forces exerted are very small, polishing is very fine.
243. For obtaining a better finish using Magnetic abrasive finishing, tubes are rotated at which speeds?
a) Very low
b) Low
c) Medium
d) Very High
.
Answer: d
Explanation: To obtain a better finish in Magnetic abrasive finishing, tubes are rotated at very high speeds.
244. Which of the following is an advantage of MAF over Electrolytic finishing?
a) Disposing of electrolyte
b) Cost effective
c) More flexible
d) More accuracy
.
Answer: a
Explanation: In MAF, the problem of disposing electrolyte as in case of Electrolytic finishing is not present.
245. State whether the following statement is true or false about Magnetic abrasive finishing.
“Mirror finishing, removed burrs with lowering the accuracy of the shape are achieved by MAF.”
a) True
b) False
.
Answer: b
Explanation: Removed burrs without lowering the accuracy are obtained using MAF.
246. What are the other applications where Magnetic abrasive finishing can be used?
a) Removal of oxide layers
b) Removal of protective coatings
c) Chamfering
d) All of the mentioned
.
Answer: d
Explanation: All the processes mentioned above can be done using Magnetic abrasive finishing.
