machine tools mcq

Mechanical Engineering Questions and Answers on Machine Tools

1. Which of the following drill is most suitable for softer material?

a) 48 degree helix angle drill

b) 68 degree helix angle drill

c) 58 degree helix angle drill

d) 18 degree helix angle drill

Answer: d

Explanation: Helix angle with lower value is more suitable for soft material. Helix angle have negative value for right handed flute.

2. Point angle of drill is also known as

a) Taper angle

b) Friction angle

c) Helix angle

d) Cutting angle

Answer: c

Explanation: Point angle of drill is also known as cutting angle. Small point angle drills are favored for brittle material because brittle material has low chip flow. Small point angle makes drill strong. But it reduces the passage area for chip flow.

3. Which of the following drill will be most suitable for drilling of brittle material?

a) Small point angle drill

b) Large point angle drill

c) Zero point angles drill

d) None of the mentioned

Answer: a

Explanation: Small point angle drills are favored for brittle material because brittle material has low chip flow. Small point angle makes drill strong. But it reduces the passage area for chip flow. Point angle of drill is also known as cutting angle.

4. For drilling of brass work piece, most suitable rake angle in degrees for drill will be

a) 12

b) 15

c) 0

d) -9

Answer: c

Explanation: Brass is neither brittle nor ductile and hence zero rake angle is preferred for drilling of brass work piece.

5. Which of the following is most suitable range of lip clearance angel in degrees for drilling of aluminum work piece?

a) 8-12

b) 3-2

c) 50-60

d) None of the mentioned

Answer: a

Explanation: 8 degree to 12 degree is the best range of lip clearance angle for most of the operations.

6. Operation of finishing previously drilled hole in order to bring it to accurate size and have good surface finish is known as

a) Drilling

b) Reaming

c) Boring

d) Counter boring

Answer: b

Explanation: Reaming is a finishing operation of drilled hole. It is done to improve surface finish of drilled hole.

7. Process of enlarging the hole size and enhancing its surface finish is known as

a) Drilling

b) Reaming

c) Boring

d) Counter boring

Answer: c

Explanation: Once the hole is drilled by using drilling operation, later the diameter of hole can be increased by using boring operation.

8. Process of enlarging only a small part of hole is also known as

a) Drilling

b) Reaming

c) Boring

d) Counter boring

Answer: d

Explanation: Once the hole is drilled by using drilling operation, later the diameter of some part of hole can be increased by using counter boring operation.

9. Operation of enlarging the end of the hole to give conical shape at end is known as

a) Drilling

b) Reaming

c) Boring

d) Counter sinking

Answer: d

Explanation: Once the hole is drilled by using drilling operation, later the ends of hole can be machined into conical shape for proper adjustment of washer or other machine parts by using Counter sinking operation.

10. Operation used to form internal threads is known as

a) Drilling

b) Reaming

c) Boring

d) Tapping

Answer: d

Explanation: Tapping is the process of forming internal threads by means of tool called 

11. Which of the following is used for machining larger jobs?

a) shaper

b) planer

c) can’t say anything

d) none of the mentioned

Answer: b

Explanation: Planer is used for the purpose of machining too large and heavy jobs. There is a table in planer known as platen on which the work piece is fixed firmly and the operation is performed.

12. Which of the following is used for machining smaller jobs?

a) shaper

b) planer

c) can’t say anything

d) none of the mentioned

Answer: a

Explanation: Shaper is used for the purpose of machining smaller jobs. It is mainly used for producing flat and plan surfaces.

13. Which of the following machine is primarily intended for producing flat surfaces?

a) shaper

b) drilling

c) lathe

d) none of the mentioned

Answer: a

Explanation: Shaper is intended for this purpose. It was invented in 1836 by James Nasmyth.

14. Which of the following operation can be performed in shaper?

a) gear cutting

b) keyways cutting

c) curvilinear contours

d) all of the mentioned

Answer: d

Explanation: All mentioned operations can be performed in shaper. Although it is used mainly for producing flat surfaces but its a versatile machine and can be used for other purposes too.

15. In shaper, the job is kept_____

a) stationary

b) rotating

c) reciprocating

d) none of the mentioned

Answer: a

Explanation: The job is kept stationary in this machine. In shaper, cutting tool moves in order to perform operations.

16. In shaper, the cutting tool is made to reciprocate across the job.

a) true

b) false

Answer: a

Explanation: This is true. cutting tool moves in order to perform the work. Only forward movement is useful. Work is only done in forward movement.

17. Which stroke is cutting stroke in shaper?

a) forward

b) return

c) can’t say anything

d) none of the mentioned

Answer: a

Explanation: Forward stroke is cutting stroke in shaper because only in forward stroke work-cutting is done.

18. Which stroke is idle stroke in shaper?

a) forward

b) return

c) can’t say anything

d) none of the mentioned

Answer: b

Explanation: Return stroke is idle stroke in shaper because no useful work is done in this stroke.