Mechanical Operations MCQs

Question 1

Size measurement of ultrafine particles can be best expressed in terms of

Accepted Answer

Surface area per unit mass

Answer

Centimetre

Answer

Screen size

Answer

Micron

Question 2

The unit of filter medium resistance is

Accepted Answer

Cm -1

Answer

Gm/cm -1

Answer

Cm/gm -1

Answer

Gm -1

Question 3

To remove very small amount of tiny solid impurities from liquid, we use a

Accepted Answer

Coagulant

Answer

Pressure filter

Answer

Vacuum filter

Answer

Centrifugal filter

Question 4

The capacity of a gyratory crusher is __________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.

Accepted Answer

2.5 times

Answer

Same as

Answer

5 times

Answer

10 times

Question 5

Which of the following represents the plot of filtrate volume versus time for constant pressure filtration?

Accepted Answer

Parabola

Answer

Straight line

Answer

Hyperbola

Answer

Exponential curve

Question 6

Pick out the wrong statement.

Accepted Answer

200 mesh screen has 200 openings per linear cm

Answer

Hammer crushers operate by impact action

Answer

Standard screens have circular opening

Answer

With increase in mesh number of screens, their diameter in microns decreases

Question 7

Fluid medium used in the classification technique of mineral beneficiation is

Accepted Answer

Both A & B

Answer

Air

Answer

Water

Answer

Neither A nor B

Question 8

Cumulative analysis for determining surface is more precise than differential analysis, because of the

Accepted Answer

Assumption that all particles in a single fraction are equal in size, is not needed

Answer

Assumption that all particles in a single fraction are equal in size

Answer

Fact that screening is more effective

Answer

None of these

Question 9

Which of the following is a fine crusher?

Accepted Answer

Toothed roll crusher

Answer

Blake jaw crusher

Answer

Gyratory crusher

Answer

Dodge jaw crusher