Q.1) A cutting tool used to finish and enlarge a hole is known as

Drill

Tap

Die

Reamer

Correct answer- (D)

Q.2) Which one of the following metals does not require any coolant during reaming?

Aluminium

Cast iron

Copper

Steel

Correct answer- (B)

Q.3) The grooves provided on the entire length of the body of a twist drill are called

lips

flutes

margin

webs

Correct answer- (B)

Q.4) A wedge like tool is used for removing the taper shank tools from the nose of the machine spindle ? What is this called?

Drill chuck

Drill key

Drill socket

Drill drift

Correct answer- (D)

Q.5) A hole, which is not made through full depth of the component is known as

core hole

blind hole

pin hole

bore hole

Correct answer- (B)

Q.6) The drill sleeves or sockets are available with morse taper and their number range MT-1 to MT-6. Which one of the following drill sizes refers to MT-4 ?

Drills above 14 mm upto 23 mm

Drills above 23 mm upto 31.75 mm

Drills above 31.75 mm upto 50.50 mm

Drills above 50.50 mm upto 76 mm

Correct answer- (C)

Q.7) A drilled hole goes out of centre due to

improper clamping of workpiece

workpiece having blow holes

centre punch mark not being large enough to give proper seat to the chisel edge of drill

any one of the above

Correct answer- (D)

Q.8) Which one of the following coolants is used for reaming aluminium workpiece?

Kerosene

Water

Air pressure

Lard oil

Correct answer- (A)

Q.9) A Ø 6H7 hole is to be reamed in a steel workpiece. What size of drill will be required?

5.5 mm

5.8 mm

6.0 mm

6.2 mm

Correct answer- (B)

Q.10) The point angle of twist drill depends upon the

cutting speed

type of drilling machine

size of the drill

material to be drilled

Correct answer- (D)

Q.11) The point angle of twist drill for general purposes is *

4 points

135°

118°

90°

60°

Correct answer- (B)

Q.12) The relief angle given behind the cutting lips is called

lip clearance angle

helix angle

rake angle

chisel edge angle

Correct answer- (A)

Q.13) A hole of 10 mm diameter is to be finished with a hand reamer. The hole size required for reaming should be

9.75 mm

9.50 mm

9.25 mm

9.00 mm

Correct answer- (A)

Q.14) The process of enlarging the end of an existing hole to accommodate the head of socket screw is called

spot-facing

boring

counter-boring

counter-sinking

Correct answer- (C)

Q.15) The process of beveling the end of existing hole is called

spot-facing

boring

counter-boring

counter-sinking

Correct answer- (D)

Q.16) The taper shank drills should be removed from the machine spindle by means of

hammer

tang of file

punch

drift

Correct answer- (D)

Q.17) Drill chucks are held on the machine spindle by means of

arbor

drift

draw-in bar

chuck nut

Correct answer- (A)

Q.18) Drill sleeve is used when the taper shank of the drill is

smaller than the machine spindle

larger than the machine spindle

equal to the machine spindle

None of the above

Correct answer- (A)

Q.19) The lip clearance angle of twist drill for general purpose should be

3° to 5°

4° to 8°

8° to 12°

12° to 15°

Correct answer- (D)

Q.20) The suitable cutting fluid for drilling M.S. plate is

soluble oil

water

compressed air

dry

Correct answer- (A)

Q.21) The distance a drill advances into the job in one complete revolution is known as

r.p.m.

cutting speed

feed

machine speed

Correct answer- (C)

Q.22) Which one of the following is used to hold the straight shank drill having diameter less than 12 mm ?

Sleeve

Socket

Drill chuck

Drill drift

Correct answer- (C)

Q.23) The rate of feed depends upon

finish required

material of tool (drill)

material to be drilled

all the above

Correct answer- (D)

Q.24) Which among the following is NOT the factor for selection of cutting speed and feed for reaming a hole with a machine reamer?

Material of the job.

Material of the reamer.

Diameter (size) of the reamer.

Rigidity of the fixture.

Correct answer- (D)

Q.25) A nut is to be made for a screw of M 10 x 1.5. What should be the size of drilled hole?

8.5 mm

9.0 mm

9.5 mm

10.0 mm

Correct answer- (A)

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