Rittinger's crushing law states that

For crushing of solids, the Rittinger's law states that the work required for crushing is proportional to

A

The new surface created

B

The size reduction ratio

C

The change in volume due to crushing

D

None of these

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°

Choke crushing (in case of a Jaw crusher) compared to free crushing

A

Results in increased capacity

B

Consumes less power

C

Consumes more power

D

Both A and C

The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the

A

Feed material

B

Type of crushing machine

C

Both A & B

D

Neither A nor B

Bond crushing law

A

calls for relatively less energy for the smaller product particles than does the Rittinger's law

B

is less realistic in estimating the power requirements of commercial crushers

C

states that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of the product

D

states that the work required for the crushing is proportional to the new surface created

The work index in Bond's law for crushing of solids has the following dimensions

A

No units (dimensionless)

B

kWh/ton

C

kW/ton

D

$${\text{kWh}}.{{\text{m}}^{\frac{1}{2}}}/{\text{ton}}$$

For long columns, the value of buckling load is __________ crushing load.

A

Equal to

B

Less than

C

More than

D

None of these

Crushing strength of a first class brick should not be less than

A

3.5 N/mm²

B

7.0 N/mm²

C

10.5 N/mm²

D

14.0 N/mm²

Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.

A

1.5-2

B

3.5-4.5

C

7-9

D

12-14

Which of the following is used for primary crushing of very hard lumpy materials?

A

Toothed roll crusher

B

Gyratory crusher

C

Ball mill

D

Tube mill

Rittinger's crushing law states that

Related Questions