Q. Mandrels are used for holding solid work piece.
A. true
B. false
.
Answer: B
Explanation: This is false. Mandrels are used for holding hollow work piece.
Q. Which of the following is not true?
A. the work piece must have their bores machined accurately
B. the mandrels are to be located before the centres
C. mandrels are used for turning concentric
D. none of the mentioned
.
Answer: B
Explanation: All the sentences are true except one which says that the mandrel are to be located before the centres. The mandrels should be located in between the centres.
Q. Mandrels are driven by_____
A. catch plates
B. carriers
C. catch plates and carriers both
D. none of the mentioned
.
Answer: C
Explanation: Both are used to drive the mandrels. Catch plates are either screwed or bolted to the nose of the tailstock spindle while the carriers consist of a cast iron or forged steel body.
Q. The diameters at the beginning are slightly smaller and flattened.
A. true
B. false
.
Answer: B
Explanation: This is false. The diameters at the end are slightly smaller and flattened to provide effective gripping surface of the lathe dog set screw..
Q. Why gripping mandrels are made of high carbon steel?
A. to avoid distortion
B. to avoid wear
C. both to avoid distortion and wear
D. none of the mentioned
.
Answer: C
Explanation: The gripping mandrels are made of high carbon steel to avoid both distortion and wear. Along with this, the gripping power of this mandrels is not much.
Q. Less common but very often used method is_____
A. parallel mandrel
B. threaded cone mandrel
C. both parallel mandrel and threaded cone mandrel
D. none of the mentioned
.
Answer: C
Explanation: There are several types of mandrels in use depending upon the specific requirements of the job. Less common but very often used is the parallel mandrel and the threaded cone mandrel.
Q. The mandrels are driven into the work by tapping by_____
A. copper hammers
B. lead hammers
C. copper hammer and lead hammer both
D. none of the mentioned
.
Answer: C
Explanation: The mandrels are driven into the work by tapping with copper and lead hammers or by an arbor press or by mandrel press.
Q. Which of the following is not true?
A. the mandrels are used depending upon the specific requirements of the job.
B. the gripping power of mandrels is very high
C. effective gripping surface of the lathe dog set screw is done
D. none of the mentioned
.
Answer: B
Explanation: All mentiones sentences are true except one which says that the gripping power of the mandrel is very high. The gripping power of the mandrels is not much.
Q. Which of the following is the type of mandrels?
A. plain mandrels
B. stepped mandrels
C. collar mandrels
D. all of the mentioned
.
Answer: D
Explanation: All of mentioned are the types of mandrels. Apart from these other types of mandrels are also there like expansion mandrel, gang mandrel and so on.
Q. Turning a job on mandrel should be with heavy cuts.
A. true
B. false
.
Answer: B
Explanation: This is false. Turning a job on mandrels should be with light cuts.
Q. Which of the following mandrels are most commonly used?
A. plain mandrels
B. stepped mandrels
C. collar mandrels
D. none of the mentioned
.
Answer: A
Explanation: The plain mandrels are most commonly used. It is also known as simple mandrel.
Q. Plain mandrels are used where large number of identical work pieces having standard size holes are required to be mounted.
A. true
B. false
.
Answer: A
Explanation: It can be easily understood from definition of the plain mandrels. In this mandrel, the size of the mandrel is indicated at the flat end portion of the mandrel.
Q. The difference in diameter is_____ mm per 100 mm length in case of the plain mandrels.
A. 1to 2
B. 4 to 5
C. 8 to 10
D. 10 to 12
.
Answer: A
Explanation: The difference in diameter is 1 to 2 mm per 100 mm length in case of the plain mandrels. The taper is provided for proper gripping of the work.
Q. Plain mandrel is suitable for_____ size of bore.
A. only one
B. two
C. more than two
D. none of the mentioned
.
Answer: A
Explanation: Plain mandrel is suitable for only one size of bore. For different sizes of holes in workpieces different diameters of mandrels are used.
Q. In plain mandrels, length varies from_____ mm.
A. 15 to 90
B. 125 to 300
C. 55 to 430
D. 235 to 660
.
Answer: C
Explanation: In plain mandrels, length varies from 55 to 430 mm. The body of this mandrel is slightly tapered.
Q. Which of the following is not true in case of plain mandrel?
A. the body of the mandrel is heavily tapered
B. the taper is provided for proper gripping of the work piece
C. the size of mandrel is indicated at the flat end portion of the mandrel
D. none of the mentioned
.
Answer: A
Explanation: All the mentioned sentences are true except the one which says that the body of mandrel is heavily tapered. Actually, its body is just slightly tapered.
Q. Stepped mandrels are used for turning______
A. collars
B. washers
C. odd sized jobs
D. all of the mentioned
.
Answer: D
Explanation: Stepped mandrels are used for collars, washers, odd sized jobs and so on. The stepped mandrel will have steps of different diameters to accommodate different workpieces.
Q. Which of the following is not true about steeped mandrels?
A. it can have steps of different diameters
B. it can accommodate different work pieces having different sizes of holes
C. removal of mandrel is necessary each time
D. none of the mentioned
.
Answer: C
Explanation: Removal of mandrel is not necessary each time. Sometimes, it can accommodate work piece without removing the mandrel.
Q. In collar mandrel, mandrels are provided with solid collars for turning work pieces having holes of small diameters.
A. true
B. false
.
Answer: B
Explanation: In collar mandrel, mandrels are provided with solid collars for turning work pieces having holes of large diameters.
Q. Collar mandrel fits better than a solid mandrel of equal size.
A. true
B. false
.
Answer: A
Explanation: The construction of collar mandrel reduces its weight considerably and that’s the reason why it fits better than solid mandrel of equal size.
Q. Which of the following mandrel is mostly used for work piece having internal threads?
A. stepped mandrel
B. collar mandrel
C. gang mandrel
D. none of the mentioned
.
Answer: D
Explanation: Answer should be none of the mentioned. Screw mandrel is mostly used for work piece having internal threads.
Q. In screwed mandrel, the threads_____
A. are left handed
B. are right handed
C. may be left or right handed
D. none of the mentioned
.
Answer: C
Explanation: In screwed mandrel, the threads may be left or right handed. Screw mandrels are used for turning the external surfaces of screwed flanges, back plates of chucks etc.
Q. Which of the following is not true for screwed mandrel?
A. the screw mandrel is threaded at one end with a collar
B. the work piece are screwed on to the threaded portion against the collar for machining
C. screw mandrels are used for turning the internal surfaces of screwed flanges, back plates of chucks etc
D. none of the mentioned
.
Answer: D
Explanation: All the mentioned sentences are true except the one which says that screw mandrels are used for turning the internal surfaces of screwed flanges, back plates of chucks etc. Actually, screw mandrels are used for turning the external surfaces of screwed flanges, back plates of chucks etc.
Q. P mandrel consists of a solid one attached to one end and a sliding cone and adjusting nut on the other end. Identify P.
A. plain mandrel
B. stepped mandrel
C. cone mandrel
D. none of the mentioned
.
Answer: C
Explanation: This is the property of cone mandrel. This type of mandrel is suitable for holding workpieces of different diameters.
Q. The cone should be more tightened upon the work piece in cone mandrels.
A. true
B. false
.
Answer: B
Explanation: This is false. The cone should not be tightened too much over the work piece otherwise the outer surface the outer edge may get spoiled.
Q. Which of the following is the part of gang mandrel?
A. fixed collar
B. movable collar
C. nut
D. all of the mentioned
.
Answer: D
Explanation: All of the mentioned are the parts of the gang mandrel. A set of hollow workpieces are mounted on this mandrel and tightened with a nut. The friction between the sides of the work and collar drives the work without any slippage.
Q. In expansion mandrel, how many longitudinal slots are there?
A. 1
B. 2
C. 3
D. 4
.
Answer: C
Explanation: 3 longitudinal slots are there in expansion mandrel. This type of mandrels are very useful in repair workshops where the diameters of workpieces differ frequently from standard sizes.
Q. P mandrel is often provided with adapters or sleeves of different diameters to fit a wide variety of work piece bores. Identify P.
A. gang mandrel
B. expansion mandrel
C. collar mandrel
D. none of the mentioned
.
Answer: B
Explanation: Expansion mandrel is often provided with adapters or sleeves of different diameters to fit a wide variety of work piece bores. The expansion mandrel has a tapered pin driven into a sleeve which is parallel outside and tapered inside.
Q. Expanding mandrels are also available with taper shank.
A. true
B. false
.
Answer: A
Explanation: Expanding mandrels are also available with taper shank to suit the spindle taper of the lathe.
Q. Expanding mandrels can be______ at one end.
A. plane
B. threaded
C. either plane or threaded
D. none of the mentioned
.
Answer: C
Explanation: Expanding mandrels can be plane or threaded at one end. Expansion mandrels are also known as expanding mandrels and this is the property of expansion mandrels.
Q. P is lathe accessory used to give extra support for a long slender work pieces. Identify P.
A. steady rests
B. tool post
C. mandrels
D. none of the mentioned
.
Answer: A
Explanation: Steady rests is lathe accessory used to give extra support for a long slender work pieces in addition to the centre support during turning.
Q. Rests are used when support from_____ end cannot be given for drilling, reaming, tapping etc.
A. headstock
B. tailstock
C. apron
D. none of the mentioned
.
Answer: B
Explanation: Rests are used when support from tailstock end cannot be given for drilling, reaming, tapping etc. These rests are fixed at some intermediate points to prevent bonding of work pieces due to their own weight.
Q. The jaws can be moved readily_____ by means of adjusting screws in fixed steady rest.
A. in
B. out
C. either in or out
D. none of the mentioned
.
Answer: C
Explanation: The jaws can be moved readily in or out by means of adjusting screws. The three jaws are adjusted on a trued cylindrical face of the work piece.
Q. The rest are fixed to prevent the vibration set up due to_____
A. own weight
B. chattering forces
C. own weight and chattering forces both
D. none of the mentioned
.
Answer: B
Explanation: The rest are fixed to prevent the vibration set up due to chattering forces. The use of this rest eliminates the chatter.
Q. Which of the following is not true for rests?
A. rests are used when the length of the work piece is 10 to 15 times the diameters
B. rests help in achieving greater accuracy in machining
C. rests permit only light cuts
D. none of the mentioned
.
Answer: C
Explanation: All mentioned sentences are true except the one which says that the rests are permits only light cuts. Rests permit only heavy cuts.
Q. Which of the following is the type of steady rest?
A. fixed steady rest
B. follower steady rest
C. both fixed steady rest and follower steady rest
D. none of the mentioned
.
Answer: C
Explanation: Both are the types of steady rest. A fixed steady rest is fixed to the lathe bed while follower steady rest consists of a c like frame.
Q. Which of the following are the parts of fixed rest?
A. adjustable pads
B. locking screw
C. bearing pads
D. all of the mentioned
.
Answer: D
Explanation: All above mentioned are the parts of fixed rest. Apart from these, base, bed clamp, hinge etc. are also the parts of fixed steady rest.
Q. Fixed steady rest is stationary.
A. true
B. false
.
Answer: A
Explanation: Fixed steady rest is stationary because it is fixed to the lathe bed.
Q. Fixed steady rest gives support at_____ fixed place only.
A. one
B. two
C. more than two
D. none of the mentioned
.
Answer: A
Explanation: Fixed steady rest gives support at one fixed place only. A fixed steady rest can be clamped at any desired position on the lathe bed.
Q. Fixed steady rest consists of a frame containing_____ adjustable pad.
A. 1
B. 2
C. 3
D. 4
.
Answer: C
Explanation: Fixed steady rest consists of a frame containing three adjustable pads. These pads are also known as jaws.
Q. The top of the frame is machined to suit the inside ways of the
lathe bed in fixed steady rest.
A. true
B. false
.
Answer: B
Explanation: This is false. The base of the frame is machined to suit the inside ways of the lathe bed in fixed steady rest.
Q. Which portion of the bed is hinged at the back in fixed steady rest?
A. top
B. middle
C. bottom
D. none of the mentioned
.
Answer: A
Explanation: The top portion of the bed is hinged at the back to permit the top to be lifted or assembled to the bottom half.
Q. In fixed steady rest, a fixed steady can be clamped_____
A. parallel to lathe bed
B. perpendicular to lathe bed
C. at any desired position on the lathe bed
D. none of the mentioned
.
Answer: C
Explanation: A fixed steady can be clamped at any desired position on the lathe bed. This is done with the help of base clamping screw.
Q. In fixed steady rests, these rests are fixed at some intermediate points to prevent bending of work pieces due to_____
A. own weight
B. chattering forces
C. own weight and chattering forces both
D. none of the mentioned
.
Answer: A
Explanation: These rests are fixed at some intermediate points to prevent bending of work pieces due to their own weight. This rests help in achieving greater accuracy in machining and permit heavier cuts.
Q. Which of the following is not true for fixed steady rest?
A. the three pads or jaws are adjusted on a trued cylindrical face of the work piece
B. a fixed steady can be clamped by the base clamping screw
C. pads are also known as jaws
D. none of the mentioned
.
Answer: D
Explanation: The all above mentioned are true. Jaws can also be termed as pads and also a fixed steady rest can be clamped by base clamping screws.
Q. Which of the following is also known as the travelling steady?
A. fixed steady rest
B. follower steady rest
C. fixed steady rest and follower steady rest both
D. none of the mentioned
.
Answer: B
Explanation: Follower steady rest is also termed as travelling steady. Adjustable screw, bearing pads, frame, lock nut etc. are the main parts of this machine.
Q. Follower steady rest consists of_____ like frame.
A. D
B. C
C. S
D. None of the mentioned
.
Answer: B
Explanation: Follower steady rest consists of ‘C’ like frame. These type of rest is used in finish turning operations or where the entire length of the workpiece is to be turned at a stretch, without disturbing the setting.
Q. How many adjustable pads does follower steady rest has?
A. 1
B. 2
C. 3
D. 4
.
Answer: B
Explanation: Follower steady rest has 2 adjustable pads. These pads are helpful for supporting the work.
Q. In follower steady rest, there is a pad which is located_____ the cutting tool.
A. in front of
B. opposite to
C. besides
D. none of the mentioned
.
Answer: B
Explanation: The pad is located opposite to the cutting tool and the other pad bears the top of the workpiece to prevent from spinning up due to the thrust of the load.
Q. In follower steady rest, the work piece is machined slightly wider
than the jaws.
A. true
B. false
.
Answer: A
Explanation: The piece of work is machined slightly wider than jaws to provide bearing surface. For this, the machine surface is brought under the jaws and the tool is set slightly in advanced position than the jaws.
10. Which type feed is provided in follower steady rest?
A. longitudinal
B. cross
C. both cross and longitudinal
D. none of the mentioned
.
Answer: A
Explanation: The tool is fed longitudinally in follower steady rest and the jaws follow the tool giving support where cutting actually take place..
Q. Which of the following is not true for steady follower rest?
A. it is used in finish turning operation
B. it is used where the entire length of the work piece is to be turned at a stretch, without disturbing the setting
C. the support is discontinuous to the entire length of cutting
D. none of the mentioned
.
Answer: D
Explanation: All above sentences are true except the sentence which says that support is discontinuous to the entire length of cutting.The support is continuous to the entire length of cutting.
Q. Which of the following tool material is not suitable for small diameters?
A. carbon steel
B. carbides
C. carbon and carbides both
D. none of the mentioned
.
Answer: B
Explanation: Carbides are not suitable for small diameters as these carbides has higher speeds and generally used in rapid stock removal.
Q. Which of the following cutting material cannot be forged to shape easily?
A. carbides
B. ceramic
C. stellites
D. none of the mentioned
.
Answer: C
Explanation: Stellites cannot be forged to shape easily because they are very brittle in nature.
Q. Which of the following is not the disadvantage of diamonds?
A. incompressible
B. readily conducts heat
C. rigid machine are required
D. all of the mentioned
.
Answer: C
Explanation: For ceramics, we need rigid machines. The other two mentioned disadvantages are true for diamond.
Q. High speed steel has an excessive wear on______
A. castings
B. hard materials
C. casting and hard materials both
D. none of the mentioned
.
Answer: C
Explanation: It has excessive wear on casting and hard materials and that’s why can only perform slow and medium cutting speeds.
Q. Which of the following has poor shock resistant?
A. carbides
B. diamonds
C. ceramics
D. none of the mentioned
.
Answer: C
Explanation: Ceramic has poor shock resistant. Apart from this, it has high wear resistance and again has very high stock removal rate.
Q. In which tool material, rigid machines are required?
A. ceramics
B. carbon steel
C. diamonds
D. all of the mentioned
.
Answer: A
Explanation: Ceramics are used for this purpose. They are not suitable for intermittent cut and even for small diameters.
Q. Machine tools must be tough enough to withstand_____
A. shock
B. vibration
C. both shock and vibration
D. none of the mentioned
.
Answer: C
Explanation: Machine tools must be tough enough to withstand these both in order to provide stability against downward pressure and to perform the job more accurately.
Q. Carbides are used in_____
A. rapid stock removal
B. higher speeds
C. rapid stock removal and higher speed both
D. none of the mentioned
.
Answer: C
Explanation: Carbides are used for these both reasons. But they are not used for comparatively small jobs.
Q. “Light finishing cuts in expensive forming tools”- this quality is applicable to_____
A. carbides
B. ceramics
C. stellites
D. none of the mentioned
.
Answer: D
Explanation: The answer should be none of mentioned. This is the quality of carbon steel.
Q. Which of the following is easy to grind and generally used for intermittent cut?
A. carbides
B. diamond
C. high speed steel
D. none of the mentioned
.
Answer: C
Explanation: High speed steel has some advanced quality and so it is very accurate even on small diameters. So it is easy to grind high speed steel. Again, this high speed steel is generally used for intermittent cut.
Q. “High compressive strength with negative rake” – this is applicable to_____
A. carbides
B. diamonds
C. carbon steel
D. none of the mentioned
.
Answer: A
Explanation: This is the quality of carbides. That’s why they are not suitable for very small diameters.
Q. Which of the following tool material has excessive wear?
A. carbon steel
B. high speed steel
C. carbon steel and high speed steel both
D. none of the mentioned
.
Answer: C
Explanation: These both materials have excessive wear. They have excessive wear on castings and hard materials.
Q. Stellites is good for metal cutting application.
A. true
B. false
.
Answer: B
Explanation: This is false. Stellites is good for non metal cutting application.
Q. Which of the following is not the use of diamond?
A. good for finishing work
B. suitable for cutting hard metals
C. rapid stock removal
D. all of the mentioned
.
Answer: C
Explanation: Diamond is not used for rapid stock removal. For rapid stock removal, carbides and ceramics are used.
Q. For general purpose, which type of cutting tool is used in lathe?
A. single point
B. multi point
C. can’t say anything
D. none of the mentioned
.
Answer: A
Explanation: For general purpose, single point cutting tool is used. Like both shaper and planer are single point cutting tool that only cut in straight line.
Q. For specific purpose, which type of cutting tool is used in lathe?
A. single point
B. multi point
C. can’t say anything
D. none of the mentioned
.
Answer: B
Explanation: For specific purpose, multi point cutting tool is used. Milling and drilling are generally multi point cutting tool.
Q. Ceramics are suitable for intermittent cut.
A. true
B. false
.
Answer: B
Explanation: This is false. Ceramics are not suitable for intermittent cut.
Q. Which of the following is not the type of cutting tool material?
A. carbon steel
B. stellites
C. diamond
D. none of the mentioned
.
Answer: D
Explanation: The answer should be none of the mentioned. All are the types of cutting tool material.
Q. Which of the following is very brittle?
A. stellites
B. diamond
C. both diamond and stellites
D. none of the mentioned
.
Answer: A
Explanation: Stellites are very brittle in nature. They even can’t be forged to shape.
Q. Which of the following can machine the metals effectively?
A. diamonds
B. ceramics
C. both diamonds and ceramics
D. none of the mentioned
.
Answer: C
Explanation: Ceramics can machine hard metals effectively and also has higher compressive strength with negative rake. Diamonds are good for finishing work and also suitable for cutting hard materials.
Q. Lathe cutting tool can be classified according to_____
A. manufacturing of tool
B. method of holding tool
C. method of using tool
D. all of the mentioned
.
Answer: D
Explanation: Cutting tool can be classified according to all mentioned parameters. Generally in lathe we use single point cutting tools.
Q. Which of the following cutting tool can have single roller?
A. boring tool
B. knurling tool
C. both boring tool and knurling tool
D. none of the mentioned
.
Answer: C
Explanation: Both boring tool and knurling tool can have single roller. Generally, boring tool is used to enlarge the hole. Knurling is used when we need a pattern of straight, cross and angular lines cutting each other.
Q. Lathe cutting tool can be classified as right hand and left hand according to_______
A. method of using the tool
B. method of holding the tool
C. method of applying feed
D. none of the mentioned
.
Answer: C
Explanation: Lathe cutting tool can be classified as right hand and left hand according to method of applying feed. Here, feed is the distance the tool advances for each revolution of the work.
Q. Which of the following is not the type of left hand type cutting tool?
A. roughing tool
B. facing tool
C. finishing tool
D. none of the mentioned
.
Answer: D
Explanation: All are the types of left hand cutting tool. Facing, roughing and finishing are one kind of turning operations often carried out on lathe.
Q. According to the method of using the tool, lathe cutting tool can be classified as_______
A. turning
B. grooving
C. forming
D. all of the mentioned
.
Answer: D
Explanation: According to the method of using the tool, lathe cutting tool can be classified as turning, grooving, forming, chamfering, internal thread cutting, parting-off and so on.
Q. Which of the following is not the type of classification as per the method of manufacturing the tool?
A. tipped tool, which is brazed to the carbon steel shank
B. tipped tool, which is fastened mechanically to the carbon steel shank
C. grooving
D. none of the mentioned
.
Answer: C
Explanation: Here, grooving is not the type of classification according to the method of manufacturing the tool. Grooving is the type of classification according to the method of using the tool.
Q. “Tool bit inserted in the (tool) holder and solid tool” – is included in the classification according to the_____
A. method of using tool
B. method of manufacturing tool
C. method of applying feed
D. none of the mentioned
.
Answer: D
Explanation: All options are incorrect. Answer should be none of mentioned. It is suitable with the classification of cutting tool as per the method of holding the tool.
Q. ‘Internal thread cutting’- is suitable with the classification of cutting tool according to the______
A. method of using the tool
B. method of holding the tool
C. method of manufacturing the tool
D. none of the mentioned
.
Answer: A
Explanation: It can be easily seen from the classification of cutting tool. Apart from internal thread cutting, boring, facing, forming etc. are also included in this category.
Q. ‘Round nose’ – is suitable with the classification of cutting tool according to the______
A. method of holding tool
B. method of holding tool
C. method of the applying feed
D. none of the mentioned
.
Answer: C
Explanation: It can be easily understood by looking at the classification of cutting tool. Apart from round nose, right hand tool and left hand tool are also included in this category.
Q. ‘Parting-off’ – is suitable with the classification of cutting tool according to the______
A. method of manufacturing the tool
B. method of holding the tool
C. method of using the tool
D. none of the mentioned
.
Answer: C
Explanation: ‘Parting-off’ – is suitable with the classification of cutting tool according to the method of using the tool. This parting uses a blade like cutting tool into workpiece in order to cut the metal at the speed of spindle.
Q. For lathe operations, work piece can be hold _____
A. between centres
B. on mandrel
C. either between centres or on mandrel
D. none of the mentioned
.
Answer: C
Explanation: Work piece can be hold either between centers or on mandrel. Mandrels are used for holding hollow workpieces for turning concentric to the bore.
Q. Which of the following is used to drive the work piece?
A. carriers
B. catch plates
C. both carriers and catch plates
D. none of the mentioned
.
Answer: C
Explanation: Work piece can be driven by using both of these. Catch plates are either screwed or bolted to the nose of the tailstock spindle while the carriers consists of a cast iron or forged steel body.
Q. Drilling is performed by holding the work by a chuck.
A. true
B. false
.
Answer: A
Explanation: It can be seen from the working of lathe operations. Several types of chucks are there like 4 jaw chuck, 3 jaw chuck and so on.
Q. Knurling can be performed by special attachments.
A. true
B. false
.
Answer: B
Explanation: This is false. Knurling can be done by a chuck on holding work piece between centres.
Q. Grinding can be performed by______
A. using faceplates or angle plates
B. using chucks
C. special attachments
D. none of the mentioned
.
Answer: C
Explanation: Grinding can be done by special attachments. Grinding is a type of machining using an abrasive type of wheel as the cutting tool.
Q. Taper boring and the under boring can be performed by______
A. centers
B. face plates or angle plates
C. special attachments
D. none of the mentioned
.
Answer: B
Explanation: Both types of plates can be used for this purpose. A face plate consists of a circular disk bored out and threaded to sit the nose of the lathe spindle while angel plate is a cast iron plate having two faces machined to make them absolutely at right angles to each other.
Q. Milling can be performed by _____
A. centres
B. face plates or angel plates
C. chucks
D. special attachments
.
Answer: D
Explanation: Milling can be performed by special attachments. Milling machine is a machine tool that removes metal as the work is fed against a rotating multipoint cutter.
Q. Spinning can be done by_____
A. centres
B. face plates or angle plates
C. special attachments
D. none of the mentioned
.
Answer: A
Explanation: This operation can be done by using centres. Spining winding is also done by this method.
Q. Reaming and counter boring can be performed by______
A. centres
B. face plates and angle plates
C. special attachments
D. none of the mentioned
.
Answer: B
Explanation: Both types of operations can be performed by using plates. Apart from that, parting off, internal thread cutting, undercutting are also performed by this method.
Q. Eccentric turning can be performed by using special attachments.
A. true
B. false
.
Answer: B
Explanation: This is false. Eccentric type of turning can be performed by using centres or chucks.
Q. A taper may be defined as a uniform gradual_____ along the length of the job.
A. increase
B. decrease
C. increase or decrease
D. none of the mentioned
.
Answer: C
Explanation: A taper may be defined as a uniform gradual increase or decrease along the length of the job. Taper turning can be measured by from tool method, tailstock offset method, compound slide method and so on.
Q. The taper is measured in terms of radius along the length of the job.
A. true
B. false
.
Answer: B
Explanation: This is false. The taper is measured in terms of diameter along the length of job.
Q. In a lathe, taper turning means to produce a_____ surface by gradually decreasing the value of diameter from a cylindrical work piece.
A. conical surface
B. flat surface
C. both conical and flat surface
D. none of the mentioned
.
Answer: A
Explanation: Taper turning means to produce a conical surface by gradually decreasing the value of diameter from a cylindrical work piece lathe. Two types of tapers are there: internal and external taper.
Q. Which of the following is not true for taper turning?
A. taper turning is one type of lathe operation
B. the amount of taper is specified by the ratio of its length to the difference in the diameter of the taper
C. amount of taper is designated by the letter K
D. none of the mentioned
.
Answer: B
Explanation: All the sentences are true except the sentence which says that the amount of taper is specified by the ratio of its length to the difference in the diameter of the taper. The amount of taper is specified by the ratio of difference in the diameters of the taper to its length.
Q. Amount of taper in a work piece is termed as conicity.
A. true
B. false
.
Answer: A
Explanation: It can be easily understood by the definition of taper. For taper or conicity feed is provided. Two types of feeds are there: manual feed and power feed.
Q. The SI unit of taper is_____
A. meter
B. centimeter
C. millimeter
D. none of the mentioned
.
Answer: D
Explanation: Taper is ratio of same quantity. It is unitless.
Q. Full taper angle is also known as angle of taper.
A. true
B. false
.
Answer: B
Explanation: This is false. Half taper angle is also known as angle of taper.
Q. Which of the following is the right formula for taper?
A. K= (D-D. / L
B. K= L / (D-D.
C. K= D/ L
D. none of the mentioned
.
Answer: A
Explanation: K= (D-D. / L – It is the basic formula used for calculating taper. Here k=taper, D and d are diameters and l is length.
Q. Find the value of K. D= 90 mm, d=80 mm, L=1cm.
A. 1
B. 10
C. 100
D. none of the mentioned
.
Answer: A
Explanation: 1 cm = 10 mm. From the formula K= (D-D./L, K can be easily calculated.
Q. Find the value of d. K=1/10, L= 10 cm, D=65 mm.
A. 45 mm
B. 55 cm
C. 75 mm
D. none of the mentioned
.
Answer: D
Explanation: Answer should be 55 mm. It can be easily calculated from the formula K= (D-D./L.
Q. Which of the following is not the method of taper turning?
A. compound rest method
B. tailstock offset method
C. attachment method
D. none of the mentioned
.
Answer: D
Explanation: All are methods of taper turning.By using compound rest method and and attachment method, both internal and external taper can be turned while tailstock offset method is used only for external tapers.
Q. From tool method is used where accuracy is the major criterion.
A. true
B. false
.
Answer: B
Explanation: This is false. From tool method is used when accuracy is not the major criterion.The form tool should be set at right angels to the axis of the work.
Q. From tool method is generally used for_____ production for producing_____ length of taper.
A. mass, small
B. mass, long
C. little, small
D. little, long
.
Answer: A
Explanation: This method is used for mass production for producing small length of taper.
Q. Tailstock method is highly suitable for producing steep tapers.
A. true
B. false
.
Answer: B
Explanation: This is false. Tailstock method is not suitable for producing steep tapers.
Q. Attachment method can produce only small taper.
A. true
B. false
.
Answer: B
Explanation: This is false. Lengthy taper can be produced by this method.
Q. In compound slide method, which of the following is swiveled?
A. top slide
B. swivel base
C. apron
D. none of the mentioned
.
Answer: A
Explanation: Top slide is swiveled in this method. It is swiveled to half the included angel of the taper.
Q. In compound slide method, one part of compound rest is swiveled to_____ the included angle of the taper.
A. the same as
B. half
C. double
D. none of the mentioned
.
Answer: B
Explanation: In compound slide method, one part of compound rest is swiveled (at half the included angle of the taper). We can easily set this compound slide.
Q. In compound rest method, the amount of taper for setting the angle is calculated from this formula, tan of angle of taper =_____
A. (D-D. / L
B. (D-D. / 2L
C. (D-D. / 4L
D. none of the mentioned
.
Answer: B
Explanation: (D-D. / 4L – this is the formula for the tan of the angel of taper. Taper is the shape in which the diameter of the both ends are different.
Q. Which type of tapers can be produced by using compound rest method?
A. internal
B. external
C. both internal and external
D. none of the mentioned
.
Answer: C
Explanation: Both internal and external taper can be produced by using compound slide method. But there is one disadvantage. We can only give hand feed so we can’t expect a high accurate and mass work.
Q. Which of the following is not true for compound slide method?
A. threads, which are there on taper portion cannot be produced
B. steep taper cannot be produced
C. taper length is limited to the movement of the top slide
D. none of the mentioned
.
Answer: B
Explanation: All mentioned sentences are true except the sentence which says that steep taper can’t produced by this method. Steep taper can be produced by this method.
Q. In attachment method, the bar having graduations in degree is set at the_____ with the lathe axis.
A. 0 degree
B. 90 degree
C. any desired angle
D. 180 degree
.
Answer: C
Explanation: The bar is set at any desired angle with the lathe axis. The principle of turning taper by attachment is to guide the tool in a straight path set an angel to the axis of rotation of the work piece, while the work is being revolved between centers or by a chuck aligned to the lathe axis.
Q. In compound slide method, taper length is limited to the movement of_____
A. apron
B. swivel base
C. top slide
D. none of the mentioned
.
Answer: C
Explanation: Taper length is limited to the movement of top slide in this method. Along with this, easily setting of the compound slide can be done easily.
Q. The taper can be turned up to maximum setting angle of_____ for both outside and inside tapers with taper attachment and automatic feed.
A. 5 to 6 degree
B. 1 to 2 degree
C. 10 to 12 degree
D. none of the mentioned
.
Answer: C
Explanation: The taper can be turned up to maximum setting angle of 10 to 12 degree for both outside and inside tapers with taper attachment and automatic feed.
Q. Attachment method is most suitable for producing duplicate tapers.
A. true
B. false
.
Answer: A
Explanation: Attachment method is most suitable for producing duplicate tapers because the change in length of job does not affect the taper.
Q. Which of the following is not true for attachment method?
A. lengthy tapers can be produced
B. the alignment of the lathe center is disturbed
C. power feed can be given
D. none of the mentioned
.
Answer: B
Explanation: All the sentences are true except the sentence which says that the alignment of the lathe center is disturbed. The alignment of the lathe center is not disturbed in attachment method.
Q. In tailstock offset method, the job is held at an angle and the tool moves______ to the axis.
A. parallel
B. perpendicular
C. at 45 degree
D. none of the mentioned
.
Answer: A
Explanation: The tool moves parallel to the axis in this method. the body of the tailstock is shifted on its base to an amount corresponding to the angle of taper.
Q. In tailstock method, the angle at which the axis of rotation of the job is shifted is equal to______ the angle of taper.
A. half
B. double
C. triple
D. none of the mentioned
.
Answer: A
Explanation: This is angle is equal to half the angle of taper. This taper can be turned between centers only.
Q. In tailstock method, body of the tailstock is made to slide on its base_____ from the operation.
A. towards
B. away
C. either towards or away
D. none of the mentioned
.
Answer: C
Explanation: In tailstock method, body of the tailstock is made to slide on its base either away or towards from the operation. This operation is done with the help of setover screw.
Q. The form tool should be set parallel to the axis of the work.
A. true
B. false
.
Answer: B
Explanation: This is false. The form tool should be at right angle to the axis of the work.
Q. Which type of taper is generally turned in tailstock method?
A. internal
B. external
C. both internal and external
D. none of the mentioned
.
Answer: B
Explanation: Only external taper can be turned in this method. Generally for internal threads this method is not used.
Q. Which of the following is not true for tailstock method?
A. the body of tailstock is shifted on its base to an amount corresponding to the angle of taper
B. the movement of tailstock is made by a setover screw
C. accurate setting of the offset is easy
D. none of the mentioned
.
Answer: C
Explanation: All the mentioned sentences are true except one which says that accurate setting of the offset is easy. Actually, accurate setting of the offset is difficult in this method.
Q. Which of the following is not true for tailstock method?
A. the taper can be turned between centres only
B. duplicate tapers can be produced
C. the alignment of the lathe centres will be disturbed
D. none of the mentioned
.
Answer: D
Explanation: All the above sentences are true. These all sentences are related with tailstock method in which the maximum length of the taper can be produced.
Q. Which of the following is the benefit of tailstock method?
A. power feed can be given
B. good surface finish can be obtained
C. maximum length of the taper can be produced
D. all of the mentioned
.
Answer: D
Explanation: These all are the benefits of the tailstock method. Apart from these benefits, we have some other benefits too like external threads on taper portion can be produced, duplicate tapers can be produced and so on.
Q. Tailstock method damage the centre drilled holes of the work.
A. true
B. false
.
Answer: A
Explanation: This is the disadvantage of this method. Apart from it, it has other big disadvantage that only external taper can be produced.
Q. The taper turning attachment consists essentially of a frame which is attached to the_____ end of the lathe bed.
A. front
B. rear
C. both front and rear
D. none of the mentioned
.
Answer: B
Explanation: The taper turning attachment consists essentially of a frame which is attached to the rear end of the lathe bed. This attachment is provided only on a few modern lathes.
Q. Only hand feed is possible in compound slide method.
A. true
B. false
.
Answer: A
Explanation: This is the biggest disadvantage of this method. Also, threads on taper portion cannot be produced.
Q. In attachment method, cross-slide must be made_____ the lead screw.
A. fixed with
B. free from
C. can’t say anything
D. none of the mentioned
.
Answer: B
Explanation: Cross slide must be made free from the lead screw in this method. The tool mounted on the cross-slide will follow the angular path.
Q. Which type of tapers can be produced by attachment method?
A. internal
B. external
C. both internal and external
D. none of the mentioned
.
Answer: C
Explanation: Both types of tapers can be produced by attachment method. Apart from this, good surface finish is also obtained as well as the alignment of the lathe centers is not disturbed.
Q. In attachment method, the angle of swiveling the guide bar can be determined from this equation, tan of angle =______
A. (D-D. / L
B. (D-D. / 2L
C. (D-D. / 4L
D. none of the mentioned
.
Answer: B
Explanation: Here, D and d denotes diameters and L denotes length. The tan of angel is also known as the angel of swiveling the guide bar.
Q. By attachment method, large number of taper angle can be turned.
A. true
B. false
.
Answer: B
Explanation: This is false. Only limited taper angle can be turned by this method.
Q. The threading tool is clamped in the tool post on the compound slide.
A. true
B. false
.
Answer: A
Explanation: It can be easily understood by looking at the definition of the threading. The tool post holds the tool or tools meant for the operation to be performed on the work.
Q. The lead screw obtains_____ motion from the working spindle.
A. rotary
B. transmitting
C. both rotary and transmitting
D. none of the mentioned
.
Answer: A
Explanation: The lead screw obtains rotary motion from the working spindle. The lead screw drives the tool post axially against the workpiece to produce a helical groove.
Q. The _____ motion is converted into_____ motion of the tool slide
in thread cutting.
A. rotary, feed
B. feed, rotary
C. transmitting, longitudinal
D. none of the mentioned
.
Answer: A
Explanation: The rotary motion is converted into feed motion. The ledscrew has a trapezoidal thread and obtains this rotary motion which converts into feed motion by split.
Q. The split is mounted in the_____ of the carriage.
A. saddle
B. apron
C. top slide
D. cross slide
.
Answer: B
Explanation: It can be easily seen from the construction of the carriage. The apron is fastened to the saddle and hangs over the front of the bed.
Q. In thread cutting, which type of feed motion is possible?
A. engaging
B. disengaging
C. either engaging or disengaging
D. none of the mentioned
.
Answer: C
Explanation: Both types of feed motion is possible in thread cutting. In order to perform these feed motions split nut’s movement is required.
6. In thread cutting, the _____ feeds should be equal to the pitch of the thread, which is to be cut per revolution of the work piece.
A. cross feed
B. longitudinal feed
C. angular feed
D. none of the mentioned
.
Answer: B
Explanation: This is the definition of the longitudinal feeds. Again here the feed is the distance the tool advances for each revolution of work.
Q. In thread cutting, which of the following receives traversing motion from the lead screw of the lathe?
A. apron
B. top slide
C. cross slide
D. none of the mentioned
.
Answer: D
Explanation: Saddle receives traversing motion from the lead screw of the lathe, This leadscrew has a definite pitch.
Q. In thread cutting, definite ratio is calculated between the_____ feed and rotation of the_____ spindle.
A. longitudinal, headstock
B. cross, headstock
C. cross, tailstock
D. longitudinal, tailstock
.
Answer: A
Explanation: The definite ratio is calculated between the longitudinal type of feed and the rotation of the headstock spindle. This ratio should be found out so that the relative speeds of rotation of the work and the leadscrew will result in the cutting of a screw of the desired pitch.
Q. Which of the following is not true for thread cutting?
A. tool post is driven by lead screw axially against the work piece
B. the lead screw has a trapezoidal thread
C. the relative type of speeds of rotation of the work and the lead screw can result in the cutting of a screw of the desired pitch
D. none of the mentioned
.
Answer: D
Explanation: All the sentences are true. These all mentioned sentences are the related with the working of the thread cutting which can be carried on a lathe to obtain standard forms and properties of screw threads by using appropriate tools.
10. In thread chasing dial, the half nut is_____ when any live on the dial coincides with a reference live already set.
A. opened
B. closed
C. partially opened and partially closed
D. none of the mentioned
.
Answer: B
Explanation: At this condition, the half nut is closed to avoid collision. Thread chasing dial is a special attachment used in cutting threads.
Q. In thread chasing dial, half nut is closed when any numbered live coincides with reference live for_____ thread.
A. even
B. odd
C. can’t say anything
D. none of the mentioned
.
Answer: B
Explanation: In thread chasing dial, half nut is closed when any numbered live coincides with reference live for odd thread. The dial indicates when to close the split nut.
Q. The chasing dial is mounted on the right end of the _____
A. tool post
B. apron
C. head stock
D. none of the mentioned
.
Answer: B
Explanation: The chasing dial is mounted on the right end of the apron. This chasing dial is generally used to pick up the thread.
Q. In chasing dial, dial rotate as long as the half nut is_____
A. engaged
B. not engaged
C. either engaged or not engaged
D. none of the mentioned
.
Answer: B
Explanation: In chasing dial, dial rotate as long as the half nut is not engaged. Dial stops when the half nut is engaged.
14. An odd thread is one, whose pitch is an exact multiple of the pitch of the lead screw.
A. true
B. false
.
Answer: B
Explanation: This is false. An even thread is one, whose pitch is an exact multiple of the pitch of the lead screw.
Q. For feed motion, split nut has to be_____
A. always closed
B. always opened
C. either opened or closed (depend upon motion)
D. none of the mentioned
.
Answer: C
Explanation: Split nut may be open or close depends upon the situations. This is done in order to engage or disengage the feed motion.
Q. In simple gear, the intermediate gear has no effect on the ratio between the driver and the driven.
A. true
B. false
.
Answer: A
Explanation: This is true. The intermediate gear has no effect on the ratio between the driver and the driven, but merely acts as a connection between the two and serves to keep the rotation of the driver and driven in the same direction.
Q. The gear connections on a lathe______
A. always compound
B. always simple
C. may be simple or compound
D. none of the mentioned
.
Answer: C
Explanation: The gear connection on a lathe may be simple or compound depends upon the requirement. It is versatile.
Q. The gear on the stud shaft acts as a _____
A. driver
B. driven
C. can’t say anything
D. none of the mentioned
.
Answer: A
Explanation: The gear on the stud shaft act as a driver. It can be considered as spindle gear as usually it runs at the same spindle speed.
4. Which of the following is also known as Norton gearbox?
A. simple gear train
B. compound gear train
C. quick change type of gearbox
D. none of the mentioned
.
Answer: C
Explanation: Quick change type of gearbox is also known as Norton gearbox. It covers all the ratio of screw cutting and feed rate likely to be wanted.
Q. In Norton gearbox, gear changing is effected by the movement of_____ levers.
A. one
B. two
C. three
D. four
.
Answer: B
Explanation: Gear changing is affected by the movements of two levers as well as a sliding gear. This eliminates the need to remove and change the gears as in the standard change gearbox.
Q. Teeth on driven gear / teeth on driver gear =_______ T.P.I on lead screw=a, T.P.I. on work piece=b.
A. a/b
B. b/a
C. a*b
D. none of the mentioned
.
Answer: B
Explanation: (b/A. – This is the suitable ratio for threads where T.P.I on lead screw=a, T.P.I. on work piece=b. If the units of workpiece and leadscrew threads are different, in that case the gears are calculated as follows: 1 inch = 2Q.4 mm.
Q. Driver gear/driven gear =______ pitch of work piece threads=a, pitch of lead screw =b.
A. a/b
B. b/a
C. a*b
D. none of the mentioned
.
Answer: A
Explanation: It is the suitable ratio. In British it will be equal to (a/B.*(5/127).
Q. Lead screw pitch=6mm, work piece pitch=1mm. Find change gears.
A. 6
B. 1/6
C. 3
D. none of the mentioned
.
Answer: B
Explanation: Change gear=work piece pitch/lead screw pitch. From this formula, we can easily get 1/6 as a answer.
Q. Change gear=2, lead screw pitch = Q. Find work piece pitch.
A. 4
B. 16
C. 2
D. none of the mentioned
.
Answer: B
Explanation: Change gear=work piece pitch/lead screw pitch. So, work piece pitch = change gear*lead screw pitch
= 2*8
= 16
Q. In a compound train, the stud carriers______ gears.
A. 1
B. 2
C. 3
D. 4
.
Answer: B
Explanation: The stud carriers two gears. The gear on the stud shaft act as a driver.
Q. ______ is the speed at which the metal is removed by the tool from the work piece.
A. feed
B. cutting speed
C. depth of cut
D. none of the mentioned
.
Answer: B
Explanation: It can be easily understood by looking at the definition of the cutting speed. Cutting speed is a peripheral speed of the work.
Q. Which of the following represents the formula for cutting speed? cs =cutting speed, D= diameter of work, N= rpm.
A. cs = (Q.14*D*N)
B. cs = (D*N)
C. cs = (Q.14*D./N
D. none of the mentioned
.
Answer: A
Explanation: Cs = (Q.14*D*N) – This is the formula for finding the cutting speed.
Q. Which of the following represent the unit of cutting speed?
A. meter*minute
B. meter*meter*minute
C. meter / minute
D. none of the mentioned
.
Answer: C
Explanation: In cutting speed’s formula, d-diameter expressed in meter and n is rpm – revolution per minute. By putting this units in cutting speed’s formula, we can easily obtain its unit as meter/minute.
Q. _____ is the distance the tool advances for each revolution of the work.
A. feed
B. depth of cut
C. metal removal rate
D. none of the mentioned
.
Answer: A
Explanation: The feed of a cutting tool in a lathe work is the distance the tool advances for each revolution of the work. Increased feed reduces the cutting time.
Q. Which of the following is the unit of the feed?
A. mm / minute
B. mm / revolution
C. mm * minute
D. none of the mentioned
.
Answer: B
Explanation: Mm / revolution is the right unit for feed. In British system it is expressed in inches per revolution.
Q. The depth of cut is the_____ distance measured from the machined surface to the surface of the work piece, which is uncut.
A. parallel
B. perpendicular
C. at 45 degree
D. none of the mentioned
.
Answer: B
Explanation: It is the perpendicular distance measured from the machined surface to the surface of the work piece, which is uncut. Other factors remaining constant, the depth of cut varies inversely as the cutting speed.
Q. Which of the following represents the formula for the depth of cut? d1=diameter of work surface before machining and d2=diameter of the machined surface
A. d1+d2
B. d1-d2
C. (d1+d2)/2
D. (d1-d2)/2
.
Answer: D
Explanation: (D1-d2) – this is the formula for depth of cut. Here both d1 and d2 are diameters and expressed in mm.
Q. Which of the following represents the formula for metal removal rate?
a=cutting speed, b=depth of cut, c=feed, d=revolution
A. (a*b*D./c
B. (a*B./(c*D.
C. (a*b*C./d
D. none of the mentioned
.
Answer: C
Explanation: (a*b*C./d – This is the right formula for metal removal rate. Here a is expressed in mm/minute, b is expressed in mm, c is expressed in mm/revolution and d is simply revolution.
Q. Which of the following represents the unit of metal removal rate?
A. mm/revolution
B. mm*mm/revolution
C. mm*mm*mm/revolution
D. none of the mentioned
.
Answer: C
Explanation: Mm*mm*mm / revolution is the right unit for the metal removal rate. If we put the units of cutting speed, depth of cut and feed in formula we can easily get this result.
Q. Which of the following represents the unit for machining time?
A. mm / minute
B. minute / revolution
C. minute
D. none of the mentioned
.
Answer: C
Explanation: Machining time is simply a time so its unit must be matched with time’s unit. Minute is the right unit for machining time.
Q. Which of the following represents the formula for the machining time? s=feed of the job per revolution, l=length of the job, n=rpm.
A. l / (s*n)
B. (s*n) / l
C. (l*s) / n
D. none of the mentioned
.
Answer: A
Explanation: Length of the job / (feed of the job per revolution*rpm) is the right for machining time. Also we can cross check the formula. Put the unit of each quantity and check in which formula we can get unit as a time’s unit.
Q. For general purposes, ratio of the depth of cut to the feed varies from_____
A. 10:1
B. 1:10
C. 100:1
D. 1:100
.
Answer: A
Explanation: The ratio varies from 10:Q. The depth of cut varies inversely as the cutting speed.
Q. Which of the following is included in basic machine tools?
A. lathe machine
B. production milling machine
C. production drilling machine
D. none of the mentioned
.
Answer: A
Explanation: According to the definition of basic type of machine tools, lathe is basic machine tool while production milling machine and production drilling machines are special purpose drilling machines.
Q. Which type of machine tool is used for mass production of essentially small parts?
A. general purpose
B. special purpose
C. automatic screw cutting
D. none of the mentioned
.
Answer: C
Explanation: The automatic type of screw cutting is used for this purpose. The automatic screw cutting is used because of its high accuracy.
Q. Which of the following does all the work of lathe machine?
A. turning centre of CNC type
B. machining centre of CNC type
C. turning centre of CNC type and machining centre of CNC type both
D. none of the mentioned
.
Answer: A
Explanation: This type of turning centre does most of jobs of lathe. Lathe is a basic machine used for producing cylindrical machine. It is considered as father of machine tool.
Q. CNC machining centre does all the work_____
A. milling machine
B. drilling machine
C. both milling and drilling machine
D. none of the mentioned
.
Answer: C
Explanation: CNC machining centre perform almost all jobs of milling and drilling machines. Drilling machine is used to produce holes and milling machines remove metal as the work is fed against a rotating multipoint cutter.
Q. Which of the following is the type of lathe machine?
A. capstan
B. turret
C. both capstan and turret
D. none of the mentioned
.
Answer: C
Explanation: These both are categorized under the types of lathe machine. Turret and capstan lathe are generally used for the production of duplicate parts
Q. The development of machine tools (which are used for metal cutting) started from the invention of cylinder.
A. true
B. false
.
Answer: A
Explanation: According to the history of machine tools, Egyptians were the first, who used that. They used the cylinder.
Q. DNC stands for_____
A. digital numerical control
B. direct numerical control
C. double numerical control
D. none of the mentioned
.
Answer: B
Explanation: DNC is the abstract form of direct numerical control.
Q. Machine tools are economical for producing large rots.
A. true
B. false
.
Answer: B
Explanation: This is false. Machine tools are only economical, when it is used for producing small number of pieces.
Q. The capacity and the efficiency of the universal machine tools are high.
A. true
B. false
Answer: B
Explanation: This is false. It is comparatively low in case of universal machine tool.
10. Machine tools can be classified as _____
A. geometric shape of the work piece
B. number of the work piece
C. function of the machine
D. all of the mentioned
Answer: D
Explanation: These all are the aspects, which are responsible for the classification. In machine tools, lathe is the most important machine tool followed by drilling machine and shaper machine.
Q. Revolver machine tool is an example of special purpose machine tool.
A. true
B. false
.
Answer: A
Explanation: This is false. Revolver machine tool is an example of production machine tool.
Q. The demand of instruments or parts, which are used for
purpose of measurements are more in NC machine tool.
A. true
B. false
.
Answer: B
Explanation: This is false. The demand are less in case of NC machine tool.
