- (A) Cumulative analysis for determining surface area is preferred over differential analysis, because of the assumption that “all particles in a simple fraction equal in size” is not needed for cumulative analysis unlike differential analysis
- (B) A gate diagram is a plot of cumulative percent by weight undersize vs. the reciprocal of diameter, in which the area beneath the curve represents the surface
- (C) Capacity of crusher in choke feeding is increased
- (D) Rolling of pebbles/balls from top to bottom of the heap in tumbling mills is called ‘cascading and throwing of the balls through the air to the toe of the heap is called ‘cataracting’
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- (A) For the compressible cake, voidage & the specific resistance of the cake can be assumed to be constant
- (B) Cake resistance is independent of the pressure drop
- (C) Crushing of explosive materials are done by employing dry-grinding
- (D) Gyratory crusher is a coarse crusher
- (A) Recommended peripheral speed for the turbine agitator is 200-250 metres/minute
- (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 while the blade length is l/4th of agitator diameter (with central disc, it is l/8th of the agitator diameter)
- (D) Turbine agitator should be located at a height not less than one agitator diameter length from the bottom. If the depth of liquid in the tank is more than twice the agitator diameter, two agitators should be used
- (A) Angle of repose is always greater than the angle of slide
- (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 matter coal
- (D) Pine oil is used as a ‘modifying agent’ (for activating or depressing the adsorption of filming agents) in froth floatation process
- (A) Plastic chips are called non-cohesive solids
- (B) Kick’s crushing law is, P/m = K . ln (D̅ sa/D̅ sb)
- (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 mesh screen, is called ‘Work index’
- (A) Maximum feed size determines the required roll diameter
- (B) For hard material’s crushing, the reduction ratio should not exceed 4
- (C) Both the rolls run necessarily at the same speed
- (D) Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced
- (A) Polyamide
- (B) Polystyrene
- (C) Polyester
- (D) Polyacrylonitrile
- (A) Lignin
- (B) Cellulose
- (C) Starch
- (D) Gelatine
- (A) Epoxy
- (B) Phenol formaldehyde
- (C) Urea formaldehyde
- (D) Melamine formaldehyde
- (A) Remain hard as long as they are hot
- (B) Cannot be reclaimed from waste
- (C) Permanent setting resins
- (D) Less brittle than thermosetting resins
