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.Management Sciences
Category: Mechanical Operations
With increase in the capacity of screens, the screen effectiveness__________________?
A. Remains unchanged
B. Increases
C. Decreases
D. Decreases exponentially
Separation of solid particles based on their densities is called_________________?
A. Sizing
B. Sorting
C. Clarification
D. Dispersion
The mechanism of size reduction by a hammer mill is by impact and attrition between the________________?
A. Grinding element & the housing
B. Feed particles
C. Both A. and B.
D. Neither A. nor B.
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.
Which of the following terminology is not used for size reduction of materials to fine sizes or powders ?
A. Comminution
B. Dispersion
C. Pulverisation
D. Compression
For the preliminary breaking of hard rock, we use a____________________?
A. Gyratory crusher
B. Ball mill
C. Tube mill
D. Squirrel-cage disintegrator
The resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration, and s = particle size)?
A. c/s
B. s/c
C. s . c
D. 1/s . c
The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is_________________?
A. 1.5
B. 1
C. √2
D. None of these
For classification of potable (drinking) water, we use a _______________ filter?
A. Gravity sand
B. Plate and frame
C. Vacuum leaf
D. Rotary vacuum
Pick out the wrong statement?
A. Recycled coarse material to the grinder by a classifier is termed as circulating load
B. Wear and tear in wet crushing is more than that in dry crushing of materials
C. Size enlargement (opposite of size reduction) is not a mechanical operation
D. A ‘dust catcher’ is simply an enlargement in a pipeline which permits the solids to settle down
due to reduction in velocity of the dust laden gas
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