Category: Machine Tools & Machining Objective Questions

Machine Tools Multiple Choice Questions on “Lathe Working Principle”.

1. Which machine tool is known as the mother machine tool?
a) drill
b) milling
c) lathe
d) none of mentioned
Answer: c
Clarification: Lathe is known as the mother machine tool because it
can perform various type of operations. It is a versatile machine.

2. Lathe is primarily used for producing ____surfaces.
a) flat
b) curve
c) taper
d) none of the mentioned
Answer: d
Clarification: Lathe is primarily used for producing cylindrical surfaces. But today it can perform various operations and perform various surfaces like curvilinear surface, flat surface and so on.

3. Which type of surface is produced by turning operation in lathe machine?
a) flat
b) cylindrical
c) taper
d) none of the mentioned
Answer: b
Clarification: Cylindrical surface is produced by turning operation in lathe machine. This turning can be done on the external surface. Boring is a type of turning which is performed in the internal surface.

4. What is the necessary condition for turning?
a) material of work piece should be harder than the cutting tool
b) cutting tool should be harder than the material of work piece
c) hardness of the cutting tool and material of of piece should be same
d) none of the mentioned
Answer: b
Clarification: Cutting tool should be harder than the material of work piece, so that it can be able to cut the work piece into the desire shape.

5. Traversing of tool parallel to the axis of job is termed as_____
a) cross feed
b) longitudinal feed
c) both cross feed and traversing feed
d) none of the mentioned
Answer: b
Clarification: It is the definition of longitudinal feed. Similarly, traversing of tool perpendicular to the axis of job is known as cross feed.

6. The swing diameter over the bed is the largest diameter.
a) true
b) false
Answer: a
Clarification: This is true. Swing diameter over the lathe is the largest diameter of work over the bed that will revolve without touching height of the centres measured from the bed of the lathe.

7. Lathe cannot produce internal features like holes.
a) true
b) false
Answer: b
Clarification: This is false. Lathe is a versatile machine tool. It can produce holes, flat surfaces and so on.

8. Which type of feed is needed in facing operation?
a) longitudinal
b) cross
c) both cross and longitudinal
d) none of the mentioned
Answer: b
Clarification: Facing operation is done by the cross feed. In facing, workpiece is rotated against the single point cutting tool.

9. Which type of surface is produced in facing operation?
a) cylindrical
b) taper
c) flat
d) none of the mentioned
Answer: c
Clarification: Flat surface is produced in facing operation as per the definition. In facing operation, metal is removed by the tool from thee end of the metal and flat surface is produced.

10. Traversing of tool at any angle to the job axis produces curve surfaces.
a) true
b) false
Answer: b
Clarification: This is false. Traversing of tool at any angle to the job axis produces taper surfaces.

11. In taper operation, which type of surface is produced?
a) flat
b) curve
c) circular
d) none of the mentioned
Answer: d
Clarification: Taper type surface is produced in the process of taper turning. Taper is a shape in which the diameter of the both ends of bar are different.

12. Which type of feed is needed in turning operation?
a) longitudinal
b) cross
c) both cross and longitudinal
d) none of the mentioned
Answer: a
Clarification: As per definition, longitudinal feed is needed in turning operation. Longitudinal feed is always parallel to the axis of rotation of the spindle.

13. Which type of surface can be produced by lathe?
a) flat
b) cylindrical
c) curvilinear
d) all of the mentioned
Answer: d
Clarification: Lathe is a versatile machine. It can perform various types of jobs. It is primarily intended for producing only cylindrical surface but it can produce various types of surfaces.

Machine Tools Multiple Choice Questions on “Lathe : Chucks and Its Types-2”.

1. Generally, which type of work piece is hold in chucks?
a) of short length and small diameter
b) of large length and small diameter
c) of short length and large diameter
d) of large length and large diameter
Answer: c
Clarification: A chuck is one of the most important devices for holding and rotating a work piece in a lathe. Generally, workpiece of short length and large diameters are held in chucks.

2. The majority of three jaw chucks have three set of jaws.
a) true
b) false
Answer: b
Clarification: The above sentence is wrong. The majority of the three jaw chucks have two sets of jaws.

3. Which type of diameters does three jaw chuck hold?
a) internal diameter
b) external diameter
c) internal and external diameter both
d) none of the mentioned
Answer: c
Clarification: Three jaw chuck can hold both type of diameters : internal and external. Only perfect round work or work with equally spaced flats, divisile by three should be held in a 3 jaw chuck.

4. Which of the following is not the type of lathe chuck?
a) combination chuck
b) magnetic chuck
c) air chuck
d) none of the mentioned
Answer: d
Clarification: All are types of chucks. The all types of chucks are mentioned below.
1. four jaw chuck
2. three jaw chuck
3. two jaw chuck
4. combination chuck
5. collet chuck
6. magnetic chuck
7. drill chuck
8. hydraulically operated chuck

5. Which type of job, does the scroll perform in three jaw chuck?
a) only clamps a component in place
b) locates the component
c) clamps a component in place and locates the component
d) none of the mentioned
Answer: c
Clarification: Scroll does both jobs. The scroll not only clamps a component in place but also locates the component.This is fundamentally a practice since any wear in the scroll and/or the jaw impairs the accuracy of location.

6. Three jaw chuck is reversible.
a) true
b) false
Answer: b
Clarification: This is false. Three jaw chucks is irreversible.

7. Which of the following is not the part of four jaw chuck?
a) body
b) shaft chunk key
c) pinion
d) all of the mentioned
Answer: c
Clarification: Body and shaft chunk key are the parts of three jaw chuck but pinion is not the part of three jaw chuck. Pinion is the part of three jaw chuck.

8. Which of the following is not the part of three jaw chuck?
a) chuck key
b) crown wheel
c) back plate
d) none of the mentioned
Answer: d
Clarification: All are part of three jaw chuck. Chuck key, crown wheel and back plate are the important part of the three jaw chuck. In three jaw chuck, separate internal ans external jaws have to be used.

9. Two jaw chuck can be used as a turning mixture.
a) true
b) false
Answer: a
Clarification: As the chuck is designed with two jaws, it can be used as a turning mixture. Both jaws are adjustable and can be operted independently.

10. In combination chuck, jaws may be adjusted as_____
a) independently
b) together
c) either independently or together
d) none of the mentioned
Answer: c
Clarification: In combination chuck, both types of arrangements are possible. Combination chuck is normally a four jaw chuck.

11. Which of the following pair is correct regarding to the arrangement of the jaw?
a) four jaw – independent
b) three jaw – self centric
c) two jaw chuck – independent
d) all of the mentioned
Answer: d
Clarification: All are correct regarding the arrangement of the jaw. Both four jaw and two jaw chucks are independent chucks, while three jaw chuck is self centering chuck.

12. Which type of chuck is used in places where duplicate
work piece are to be machined?
a) four jaw chuck
b) three jaw chuck
c) two jaw chuck
d) combination chuck
Answer: d
Clarification: Combination chuck is used in places where duplicate workpieces are to be machined. One piece is accurately set as done in four jaw chuck and subsequent jobs are held by operating the centering arrangement.

13. Which of the following is not true regarding three jaw chuck?
a) if we rotate any one of three pinions, it may meshes with the teeth
b) the scroll disc, which has a spiral groove cut on the bottom face meshes with the teeth on the jaws
c) all these three jaws may be made to move simultaneously
d) none of the mentioned
Answer: b
Clarification: The scroll disc having a spiral groove cut on the top face meshes with the teeth on the jaws.

14. Which of the following is not true?
a) jobs are held by operating the centering arrangement In combination type of chuck
b) jaws may be specially machined to hold a particular type of job in two jaw chuck
c) only one jaw may be operated concentric to the centre in two jaw chuck
d) none of the mentioned
Answer: c
Clarification: All are true except the one which says that only one jaw may be operated concentric to the centre in two jaw chuck. Actually, both jaws may be operated concentric to the centre in the two jaw chuck.

15. Which of the following is not true regarding two jaw concentric chuck?
a) the feature related to construction of this type of chuck are similar to those three jaw and four jaw chuck
b) both types of jaws are adjustable
c) both types of jaws may not be operated independently
d) none of the mentioned
Answer: c
Clarification: All the mentioned sentences are true except the one which says that both types of jaws may not be operated independently. Actually, both jaws can be operated independently.

Machine Tools Multiple Choice Questions on “Taper Shank Twist Drill Machine”.

1. Point consists of a_____ center.
a) dead
b) live
c) can’t say anything
d) none of the mentioned
Answer: a
Clarification: Point consists of a dead center. Dead center is edge which is sharp situated at the extreme tip of the drill.

2. The cone-shaped end, which does the cutting is the_____
a) shank
b) point
c) tang
d) none of the mentioned
Answer: b
Clarification: As per the definition of point. This part performs the drilling work. Point is the very important for the drilling operation.

3. Which of the following does the point consist?
a) lips
b) cutting edges
c) heel
d) all of the mentioned
Answer: d
Clarification: The point consists of all these things. Cutting edges of drill are known as lips. Heel is a portion of this point back from the cutting edge.

4. Which of the following is the driving end of the drill?
a) tang
b) flute
c) shank
d) land
Answer: c
Clarification: Shank is the driving end of the drill. This shank is clamped in the spindle.

5. Which of the following is the type of shank?
a) taper shank
b) straight shank
c) taper shank and straight shank both
d) none of the mentioned
Answer: c
Clarification: Both taper shank and straight shank are the types of it. Straight shank drill uses a chuck while taper shank uses self holding taps.

6. Taper shank is used for______ diameter drills.
a) small
b) large
c) both large and small
d) none of the mentioned
Answer: b
Clarification: For large diameter, taper shank is used. Self holding taps of this shank fits easily into the drill spindle and can perform the job easily.

7. Body clearance is the part of body which has been reduced.
a) true
b) false
Answer: a
Clarification: Body clearance is a part which is reduced with a purpose to cut down the friction between the drill and the wall of the hole.

8. Flute fits into the slot of the drilling machine.
a) true
b) false
Answer: b
Clarification: This is false. Tang fits into the slot of the drilling machine.

9. Which of the following is not the part of a body?
a) land
b) margin
c) flute
d) none of the mentioned
Answer: d
Clarification: All are parts of body. Land and margin are synonyms. Apart from these, body clearance is also the part of body.

10. ______ are the spiral grooves which run to the length of the drill.
a) tangs
b) flutes
c) shanks
d) none of the mentioned
Answer: b
Clarification: As per the definition of flutes. These flutes curl the chip strongly for the purpose of easier removal.

11. The tang allows the coolant to flow to the cutting edge.
a) true
b) false
Answer: b
Clarification: This is false. The flutes allow this. The flutes also allows the flow of lubricants.

12. The diameter of the drill is measured across the land/margin.
a) true
b) false
Answer: a
Clarification: This is true. The land/margin is the narrow strip which extends to the entire length of the flutes.

13. The portion between the point and the shank is called______
a) body
b) drill
c) both body and drill
d) none of the mentioned
Answer: c
Clarification: Both terms can be used for this. The body is generally made of flute, margin and body clearance.

Machine Tools and Machining Questions & Answers for entrance exams on “Classification of Drilling Machine : According to Length to Diameter Ratio and Shank Type”.

1. If l/d ratio is too large, then drill becomes_______
a) weak
b) strong
c) very sharp
d) none of the mentioned
Answer: a
Clarification: The large l/d ratio weaken the drill. If we have very long drill with small diameter then it can’t perform drilling operation more accurately.

2. If l/d ratio is too short, then chip removal will be difficult.
a) true
b) false
Answer: a
Clarification: Chip removal will be difficult if this ratio is too short. Short l/d ratio weakens the drilling and reduce the performance. So the chip removal will be difficult.

3. Long drills are used for deep holes.
a) true
b) false
Answer: a
Clarification: As per the definition of long drill. Long drills has high l/d ration. So it can make high deeply holes.

4. For general purpose, l/d ratio should be_____
a) 5 to 10
b) 10 to 20
c) more than 20
d) none of the mentioned
Answer: a
Clarification: For general purpose, the ratio should be 5 to 10. The drills containing these ratio generally used in ordinary performances.

5. Which of the following can also be termed as center drill?
a) general drill
b) short drill
c) long drill
d) none of the mentioned
Answer: b
Clarification: Short drill can also be termed as centerr drill.

6. For long drills, l/d ratio should be more then 25.
a) true
b) false
Answer: a
Clarification: For long drills, this ratio should be more than 25. For general purpose it should have ratio of 5 to 10.

7. For small drill, l/d ratio should be 8 to 10.
a) true
b) false
Answer: b
Clarification: This is false. For small drill, l/d ratio should be 2 or 3.

8. According to the shank type, drill can be classified as______
a) straight shank
b) taper shank
c) both taper shank and straight shank
d) none of the mentioned
Answer: c
Clarification: Both taper shank and straight shank are the type of shank drill. Brace shank, straight shank, hex shank etc. are the type of shanks.

9. In ______ type, drill is held in spindle directly.
a) straight shank
b) taper shank
c) can’t say anything
d) none of the mentioned
Answer: b
Clarification: In taper type, drill is held in spindle directly. Taper shank drill is like a general purpose drill.

10. In _______ type, drill is held in chuck.
a) straight shank
b) taper shank
c) can’t say anything
d) none of the mentioned
Answer: a
Clarification: In straight type, drill is held in chuck. It is also known as reduced shank or blacksmith’s drill.

Machine Tools and Machining for entrance exams,

Machine Tools Multiple Choice Questions on “Shaper Cutting Parameters – 2”.

1. The feed is the relative movement of tool or work.
a) true
b) false
Answer: a
Clarification: This is the definition of feed. It is simply a distance measured with help of relative movement of tool or work.

2. Feed is in direction _______ to the axis of reciprocation of the arm per double stroke.
a) parallel
b) perpendicular
c) 45 degree inclined to both planes
d) none of the mentioned
Answer: b
Clarification: Feed is in direction perpendicular to the axis of reciprocation of the arm per double stroke because only in this case we get the efficient feed and accuracy.

3. Depth of cut is thickness of metal that is removed in two cut.
a) true
b) false
Answer: b
Clarification: Depth of cut is thickness of metal that is removed in one cut. Depth of cut is always measured in one cut.

4. Depth of cut is the _______ distance between machined surface and non-machined surface of the workpiece.
a) parallel
b) perpendicular
c) 45 degree inclined to both planes
d) none of the mentioned
Answer: b
Clarification: It is the perpendicular distance. Depth of cut is thickness of metal that is removed in one cut.

5. Depth of cut is expressed in ______
a) mm
b) mm/minute
c) minute
d) none of the mentioned
Answer: a
Clarification: Depth of cut is simply a distance and so its unit should be match with distance’s unit.

6. Depth of cut may be given by _____
a) tool head slide
b) lifting the table
c) both tool head slide or drifting the table
d) none of the mentioned
Answer: c
Clarification: Depth of cut may be given by tool head slide or lifting the table. These two methods are used because of its accuracy and good performance.

7. If v=cutting speed, s= feed in mm, b=width of work in mm, m=the ratio between the return time to cutting time and l= length of the cutting stroke in mm. Then, find the formula for time.
a) (l*b*m) / ( 1000*v*s)
b) (l*b*(1+m) ) / ( 1000*v*s)
c) (l*b*v) / ( m*s*1000)
d) none of the mentioned
Answer: b
Clarification: (l*b(1+m))/ (1000*v*s)-It is the formula for machining time. Machining time is simply time taken by machine to perform the job.

8. What is the unit for machining time?
a) minute
b) mm/minute
c) mm
d) none of the mentioned
Answer: a
Clarification: It is simply a time and so its unit should match with time’s unit.

9. If d=depth of cut in mm, f=feed in mm/stroke, n=stroke/min, l=length of stroke in mm, m= ratio of return stroke time to cutting stroke time, then find the formula for metal removal rate.
a) f*d*l*n*(m+1)
b) f*d*l*n*m
c) f*d*l*n*m/1000
d) none of the mentioned
Answer: a
Clarification: ( f*d*l*n*(m+1) ) – is the right formula for metal removal rate as per the definition of metal removal rate.

10. What is the unit of metal removal rate?
a) mm²/minute
b) mm³/minute
c) mm/minute
d) none of the mentioned
Answer: a
Clarification: Metal removal rate includes feed(mm/stroke), depth of cut(mm), n= rpm (stroke/min), length(mm) and m(ratio). Writing all terma appropriately with uints, you get Mm^3/minute as the unit for metal removal rate.

Machine Tools Multiple Choice Questions on “Types of Lathe”.

1. Which type of lathe is also known as centre lathe?
a) engine lathe
b) bench lathe
c) room lathe
d) capstan lathe
Answer: a
Clarification: Engine lathe is also known as the centre lathe. This centre lathe is generally used for the production of cylindrical surfaces.

2. Wheel lathe is the type of ____
a) engine lathe
b) centre lathe
c) speed lathe
d) special purpose lathe
Answer: d
Clarification: Wheel lathe is the type of special purpose lathe. This lathe is generally used for the purpose of turning wheels of railways locomotives and so on.

3. Wood working lathe is the type of ____
a) engine lathe
b) centre lathe
c) speed lathe
d) special purpose lathe
Answer: c
Clarification: Wood lathe is the type of speed lathe. Speed lathe can revolve spindle with great speed. It is also used for turning small objects.

4. Geared lathe is the type of____
a) engine lathe
b) centre lathe
c) speed lathe
d) special purpose lathe
Answer: a
Clarification: Geared lathe is the type of engine lathe. Engine lathe is a screw cutting type lathe. It has back-geared cone-driven headstock.

5. Belt driven lathe is the type of____
a) engine lathe
b) centre lathe
c) speed lathe
d) special purpose lathe
Answer: b
Clarification: Belt driven lathe is the type of centre lathe. In practical, various types of belt driven machines are used like V belt driven machine and so on.

6. Duplicating lathe is the type of____
a) engine lathe
b) centre lathe
c) speed lathe
d) special purpose lathe
Answer: d
Clarification: As per the classification of lathe, duplicating lathe the type of special purpose lathe. It is rarely used.

7. Spinning lathe is the type of____
a) engine lathe
b) centre lathe
c) speed lathe
d) special purpose lathe
Answer: c
Clarification: Spinning lathe is the type of speed lathe. Spinning lathe is a lathe generally used the purpose of shaping metal holloware with the help of flat stock over a form (of revolving type) with the help of hand tool.

8. Which of the following is the type of engine lathe?
a) centering lathe
b) individual motor driven lathe
c) duplicating lathe
d) all of the mentioned
Answer: b
Clarification: Centering lathe is the example of speed lathe and duplicating lathe is the type of special purpose lathe while individual motor driven lathe is an example of engine lathe.

9. Which of the following is special purpose lathe?
a) polishing lathe
b) centering lathe
c) spinning lathe
d) none of the mentioned
Answer: d
Clarification: Polishing lathe, centering lathe and spinning lathe are the examples of speed lathe.

10. Which of the following is the example of speed lathe?
a) wheel lathe
b) polishing lathe
c) gap bed lathe
d) all of the mentioned
Answer: b
Clarification: Wheel lathe and gap bed lathe are the examples of the special purpose lathe while polishing lathe is an example of speed lathe.

11. T – lathe is the example of bench lathe.
a) true
b) false
Answer: b
Clarification: This is false. T – lathe is the example of special purpose lathe.

12. Which of the following is the type of lathe?
a) bench lathe
b) tool room lathe
c) capstan and turret lathe
d) all of the mentioned
Answer: d
Clarification: These all are the types of lathe as per the lathe classification. Lathe is primarily intended for the purpose of producing cylindrical surfaces although today it becomes a versatile tool.

13. Lathe can be classified on the basis of_____
a) designs and construction
b) fundamental principle
c) function performance
d) all of the mentioned
Answer: a
Clarification: All types of lathe machine employ the same fundamental principle of operation and perform the same function. They are differ only in the terms of their designs and constructions.

14. Wood working lathe is the example of capstan and turret lathe.
a) true
b) false
Answer: b
Clarification: This is false. Wood working lathe is the example of speed lathe.