In drilling aluminium, a drill with

The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is _________ cutting speed for drilling mild steel with high speed steel drills.

A

Equal to

B

Less than

C

More than

D

None of these

In drilling brass, a drill with

A

Zero helix angle is used

B

Low helix angle is used

C

High helix angle is used

D

Any helix angle can be used

The point angle of a drill, for drilling stainless steel, is

A

90°

B

118°

C

135°

D

150°

The depth of cut in drilling is __________ the drill diameter.

A

Equal to

B

One-fourth

C

One-half

D

Double

In drilling Bakelite and fibrous plastics, the point angle of a drill is

A

90°

B

118°

C

135°

D

150°

The helix angle of a drill is __________ for drilling brass.

A

Equal to 30°

B

Less than 30°

C

More than 30°

D

None of these

A drill mainly used in drilling brass, copper or softer materials, is

A

Flat drill

B

Straight fluted drill

C

Parallel shank twist drill

D

Tapered shank twist drill

The cutting speed for drilling aluminium, brass and bronze with high speed steel drills varies from

A

10 to 20 m/min

B

18 to 30 m/min

C

24 to 45 m/min

D

60 to 90 m/min

Aluminium bronze contains aluminium and copper in the ratio of

A

50 : 50

B

40 : 60

C

60 : 40

D

10 : 90

The machinability of aluminium increases when _________ is added to aluminium.

A

Copper

B

Magnesium

C

Silicon

D

Lead and bismuth

In drilling aluminium, a drill with

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