The term 'angle of nip' is concerned with the operation of the __________ crushers.

Size reduction of __________ is accomplished in steam heated rollers and roll crushers.

A

Resins

B

Gums

C

Hard rubber

D

Waxes

In jaw crushers a motor has to often start against ________ load.

A

Heavy

B

Medium

C

Normal

D

Low

Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher?

A

Rod mill

B

Fluid energy mill

C

Gyratory crusher

D

Ball mill

Reduction ratio of crushers is the

A

Ratio of feed opening to discharge opening

B

Ratio of discharge opening to feed opening

C

Determining factor for minimum dia of the feed and the product

D

None of these

Size reduction mechanism used in Jaw crushers is

A

Attrition

B

Compression

C

Cutting

D

Impact

Toothed roll crushers achieve size reduction by

A

Tearing (shear) and compression

B

Impact and attrition

C

Both A & B

D

Neither A nor B

The value of 'angle of nip' is generally about

A

16°

B

32°

C

52°

D

64°

What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?

A

16°

B

32°

C

40°

D

46°

Angle of nip of the crushing rolls does not depend upon the

A

Diameter of the rolls

B

Speed of the rolls

C

Product size

D

Feed size

"Nip in the bud" means ----

A

Destroy at the very beginning

B

Bed of the rose

C

The beginning

D

Rise at the beginning

The term 'angle of nip' is concerned with the operation of the __________ crushers.

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