Mechanical Operations Mcqs
Q.1: Pick out the wrong statement ?
A. Magnetic separation method can be employed to treat both dry & wet oresG
B. Reduction ratio in crushing operation is defined as the ratio of minimum feed size to theY
C. maximum product size
D. Gyratory crusher is used for coarse crushing,
Q.2: Pick out the wrong statement?
A. Cumulative analysis for determining surface area is preferred over differential analysis,Y
B. because of the assumption that all particles in a simple fraction equal in size is not neededc
C. for cumulative analysis unlike differential analysis4
D. A gate diagram is a plot of cumulative percent by weight undersize vs. the reciprocal ofX
Q.3: Pick out the wrong statement ?
A. For the compressible cake, voidage & the specific resistance of the cake can be assumed to be]
B. constant
C. Cake resistance is independent of the pressure drop3
D. Crushing of explosive materials are done by employing dry-grindingB
Q.4: Pick out the wrong statement pertaining to the turbine agitator ?A
A. Recommended peripheral speed for the turbine agitator is 200-250 metres/minuteN
B. Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow]
C. Generally, the diameter of the agitator is kept between l/3rd to l/6th of the tank diameter whilea
D. the blade length is l/4th of agitator diameter (with central disc, it is l/8th of the agitator^
Q.5: Pick out the correct statement?
A. Angle of repose is always greater than the angle of slide9
B. A hopper is a small bin with a sloping bottom-
C. A silo is a short height vessel of very large diameter used for the storage of high volatile\
D. matter coal
Q.6: Pick out the correct statement ?
A. Plastic chips are called non-cohesive solids,
B. Kicks crushing law is, P/m = K . ln (D sa/D sb)6
C. Communition is a generic term for size enlargement operation<
D. Energy required in kwh per ton of product, such that 80% of it passes through a 200 meshX
Q.7: Pick out the wrong statement pertaining to the roll crushers?=
A. Maximum feed size determines the required roll diameter7
B. For hard materials crushing, the reduction ratio should not exceed 4G
C. Both the rolls run necessarily at the same speed0
D. Reduction ratio and differential roll speed affect production rate & energy consumed per unit]
Q.8: Pick out the wrong statement?
A. Recycled coarse material to the grinder by a classifier is termed as circulating loadU
B. Wear and tear in wet crushing is more than that in dry crushing of materialsL
C. Size enlargement (opposite of size reduction) is not a mechanical operationK
D. A dust catcher is simply an enlargement in a pipeline which permits the solids to settle downc
Q.9: Pick out the wrong statement?
A. Close circuit grinding is more economical than open circuit grindingD
B. Cod oil, beef tallow or aluminium stearates are used as grinding aids in cement industries`
C. The equipment used for the removal of traces of solids from a liquid is called a classifier[
D. Size enlargement is a mechanical operation exemplified by medicinal tablet makingQ
Q.10: Pick out the correct statement ?
A. Removal of iron from ceramic material is necessitated (by magnetic separation method) so as[
B. to avoid discolouration of ceramic products+
C. The operating cost of shaking screen is more than that of a vibrating screenL
D. Screen capacity does not depend upon the specific gravity of the mineralsI

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