The cutting speed for counter-boring should be _________ that of drilling operation.

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

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

The cutting speed for drilling copper 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

In drilling softer materials, the cutting speed is ___________ as compared to harder materials.

A

Same

B

Low

C

High

D

None of these

High speed steel cutting tools operate at cutting speeds _________ than carbon steel tools.

A

2 to 3 times lower

B

2 to 3 times higher

C

5 to 8 times higher

D

8 to 20 times higher

As the cutting speed increases, the tool cutting forces

A

Remain constant

B

Increases

C

Decreases

D

First increases and then decreases

The cutting speed is maximum while machining _________ with a high speed steel tool.

A

Cast iron

B

Mild steel

C

Brass

D

Aluminium

The cutting speed is minimum while machining _________ with a high speed steel tool.

A

Cast iron

B

Mild steel

C

Brass

D

Aluminium

The main purpose of a boring operation, as compared to drilling, is to

A

Drill a hole

B

Finish the drilled hole

C

Correct the hole

D

Enlarge the existing hole

In drilling operation, the metal is removed by

A

Shearing

B

Extrusion

C

Shearing and extrusion

D

Shearing and compression

The cutting speed for counter-boring should be _________ that of drilling operation.

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