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.
