Mechanical Operations MCQs

Question 1

Specific surface area is the surface area of a unit __________ of materials.

Accepted Answer

Either A or B

Answer

Weight

Answer

Volume

Answer

Neither A nor B

Question 2

In a mixer, the quantity, (v. L/D) is termed as __________ number(where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).

Accepted Answer

Peclet

Answer

Weber

Answer

Brinkman

Answer

Schmidt

Question 3

Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is

Accepted Answer

0.2 to 0.8

Answer

0.01 to 0.1

Answer

0.1 to 0.3

Answer

0.2 to 0.4

Question 4

The operating speed of a ball mill should be __________ the critical speed.

Accepted Answer

Less than

Answer

Much more than

Answer

At least equal to

Answer

Slightly more than

Question 5

Reduction ratio of crushers is the

Accepted Answer

Ratio of feed opening to discharge opening

Answer

Ratio of discharge opening to feed opening

Answer

Determining factor for minimum dia of the feed and the product

Answer

None of these

Question 6

Carbon black is pulverised in a

Accepted Answer

Ball mill

Answer

Hammer crusher

Answer

Roll crusher

Answer

Gyratory crusher

Question 7

Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their

Accepted Answer

Terminal velocities

Answer

Particle sizes

Answer

Densities

Answer

None of these

Question 8

Gizzlies are used for separating __________ solids.

Accepted Answer

Fine

Answer

Coarse

Answer

Any size

Answer

None of these

Question 9

A screen is said to be blinded, when the

Accepted Answer

Screen is plugged with solid particles

Answer

Oversizes are present in undersize fraction

Answer

Undersizes are retained in oversize fraction

Answer

Screen capacity is abruptly increased