Mechanical Operations MCQs

Question 1

Temperature of the product during ultrafine grinding

Accepted Answer

Increases

Answer

Decreases

Answer

Remains constant

Answer

May increase or decrease ; depends on the material being ground

Question 2

__________ mills are termed as disintegrators.

Accepted Answer

Cage

Answer

Compartment

Answer

Pebble

Answer

All of the above

Question 3

Size reduction mechanism used in Jaw crushers is

Accepted Answer

Compression

Answer

Attrition

Answer

Cutting

Answer

Impact

Question 4

200 mesh seive size corresponds to __________ microns.

Accepted Answer

74

Answer

24

Answer

154

Answer

200

Question 5

Moore filter is a __________ filter.

Accepted Answer

Leaf

Answer

Press

Answer

Rotary

Answer

Sand

Question 6

__________ is used for producing a thick suspension from a thin slurry.

Accepted Answer

Pressure filter thickener

Answer

Cartridge filter

Answer

Rotary drum vacuum filter

Answer

Plate and frame filter press

Question 7

For coarse reduction of hard solids, use

Accepted Answer

Compression

Answer

Impact

Answer

Attrition

Answer

Cutting

Question 8

If D p is the equivalent diameter of a non-spherical particle, V p its volume and S p its surface area, then its sphericity is Φ s is defined by

Accepted Answer

Φ s $$ = \frac{{6{{	ext{V}}_{	ext{p}}}}}{{{{	ext{D}}_{	ext{p}}}{{	ext{S}}_{	ext{p}}}}}$$

Answer

Φ s $$ = \frac{{{{	ext{V}}_{	ext{p}}}}}{{{{	ext{D}}_{	ext{p}}}{{	ext{S}}_{	ext{p}}}}}$$

Answer

Φ s $$ = \frac{{6{{	ext{D}}_{	ext{p}}}{{	ext{S}}_{	ext{p}}}}}{{{{	ext{V}}_{	ext{p}}}}}$$

Answer

Φ s $$ = \frac{{{{	ext{D}}_{	ext{p}}}{{	ext{S}}_{	ext{p}}}}}{{{{	ext{V}}_{	ext{p}}}}}$$

Question 9

For spheres, the specific surface shape factor is given by

Accepted Answer

$$\frac{{{	ext{AD}}}}{{	ext{V}}}$$

Answer

$$\frac{{	ext{D}}}{{	ext{V}}}$$

Answer

$$\frac{{	ext{A}}}{{	ext{V}}}$$

Answer

$$\sqrt {\frac{{{	ext{AD}}}}{{	ext{V}}}} $$