Mechanical Operations MCQ Questions & Answers | Chemical Engineering

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26.
Grinding efficiency of a ball mill is of the order of __________ percent.

A. 1-5

B. 40-50

C. 75-80

D. 90-95

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27.
In filtration, the use of 'filter aid' helps in

A. Reducing the filtration pressure

B. Accelerating the rate of filtration

C. Deplugging the filter medium

D. Enhancing the cake porosity in case of a dense impermeable cake

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28.
Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )

A. D

B. 1/D

C. D^2.5

D. 1/D^2.5

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29.
In screen analysis, the notation +5 mm/-10 mm means particles passing through

A. 10 mm screen and retained on 5 mm screen

B. 5 mm screen and retained on 10 mm screen

C. Both 5 mm and 10 mm screens

D. Neither 5 mm nor 10 mm screen

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30.
Flow of filtrate through the cake in a plate and frame filter press is best described by the __________ equation.

A. Kozney-Karman

B. Hagen-Poiseulle's

C. Fanning's

D. Kremser

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