Mechanical Operations

A. Employs smaller balls
B. Gives finer size reduction but consumes more power
C. Has larger length/diameter ratio (>2 as compared to 1 for ball mill)
D. All A., B. and C.

A. Wet grinding achieves a finer product size than dry grinding
B. Its capacity decreases with increasing fineness of the products
C. Grinding cost and power requirement increases with increasing fineness of the products
D. All A., B. and C

A. Over cake
B. Over medium
C. Overall
D. None of these

A. Removal of fines from liquid
B. Liquids having high vapour pressure
C. Liquids of very high viscosity
D. None of these

A. Sphere
B. Cube
C. Cylinder (L/D = 1)
D. Raschig rings

A. Assumption that all particles in a single fraction are equal in size
B. Fact that screening is more effective
C. Assumption that all particles in a single fraction are equal in size, is not needed
D. None of these

A. Gravity separation
B. Wettability
C. Particle shape
D. None of these

A. Hanger
B. Check plates
C. Toggles
D. Pitman

A. Gives less wear on chamber walls
B. Requires more energy
C. Increases capacity
D. Complicates handling of the product

A. Over-sizes are present in undersize fraction
B. Under-sizes are retained in oversize fraction
C. Screen is plugged with solid particles
D. Screen capacity is abruptly increased