Cold crushing strength of refractories depends upon its

Cold crushing strength of a refractory does not depend upon its

A

Shape

B

Composition

C

Firing temperature

D

Texture

Faster rate of drying of moulded refractories results in high __________ of refractories.

A

Green strength

B

Voids

C

Shrinkage

D

Both B and C

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

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

RUL of refractories depends on the

A

Chemical composition

B

Physical structure

C

Presence of impurities like iron & alkali

D

All of the above

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

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

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

For a square key made of mild steel, the shear and crushing strength are related as

A

Shear strength is equal to crushing strength

B

Shear strength is greater than crushing strength

C

Shear strength is less than crushing strength

D

None of the above

Cold crushing strength of refractories depends upon its

Related Questions