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

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

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

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

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

Rittinger's crushing law states that

A

Work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product

B

Work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product

C

Work required in crushing is proportional to the new surface created

D

For a given machine and feed, crushing efficiency is dependent on the size of the feed & product

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

According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.

A

No component is concentrated at the surface of the solution

B

The component molecules are non polar and are of almost equal size

C

In the formation of solution, chemical combination/molecular association between unlike molecules takes place

D

The attractive forces between like and unlike molecules are almost equal

Crushing resistance required to crush the rivet per pitch length is

A

$${\text{pd}}{\sigma _{\text{c}}}$$

B

$${\text{pt}}{\sigma _{\text{c}}}$$

C

$${\text{ndt}}{\sigma _{\text{c}}}$$

D

$$\left( {{\text{p}} - {\text{d}}} \right){\text{t}}{\sigma _{\text{c}}}$$

The pull required to tear off the plate per pitch length is (where p = Pitch of rivets, t = Thickness of plates and $${\sigma _{\text{t}}},\,\tau $$ and $${\sigma _{\text{c}}}$$ = Permissible tensile, shearing and crushing stresses respectively)

A

$$\left( {{\text{p}} - 2{\text{d}}} \right){\text{t}} \times {\sigma _{\text{c}}}$$

B

$$\left( {{\text{p}} - {\text{d}}} \right){\text{t}} \times \tau $$

C

$$\left( {{\text{p}} - {\text{d}}} \right){\text{t}} \times {\sigma _{\text{t}}}$$

D

$$\left( {2{\text{p}} - {\text{d}}} \right){\text{t}} \times {\sigma _{\text{t}}}$$

Which of the following gives the crushing energy required to create new surface ?

A

Taggarts rule

B

Fick's law

C

Rittinger's law

D

None of these

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

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