Mechanical Operations MCQs

Question 1

In case of a ball mill,

Accepted Answer

Coarse feed requires a larger ball

Answer

Fine feed requires a larger ball

Answer

Operating speed should be more than the critical speed

Answer

None of these

Question 2

A filter press is

Accepted Answer

A batch filter

Answer

Not suitable, if the liquid is the main product

Answer

Having prohibitively high maintenance cost

Answer

Not suitable for wide range of materials under varying operating conditions of cake thickness and pressure

Question 3

The speed of a rotary drum vacuum filter may be about __________ rpm.

Accepted Answer

1

Answer

50

Answer

100

Answer

500

Question 4

In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.

Accepted Answer

50

Answer

35

Answer

70

Answer

85

Question 5

Mesh indicates the number of holes per

Accepted Answer

Linear inch

Answer

Square inch

Answer

Square foot

Answer

Linear foot

Question 6

Crushing efficiency of a machine ranges between __________ percent.

Accepted Answer

0.1 to 2

Answer

5 to 10

Answer

20 to 25

Answer

50 to 70

Question 7

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

Accepted Answer

Gyratory crusher

Answer

Rod mill

Answer

Fluid energy mill

Answer

Ball mill

Question 8

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

Accepted Answer

Both A & B

Answer

Feed material

Answer

Type of crushing machine

Answer

Neither A nor B