Chemical Engineering MCQs

6108 MCQs (Page 200 of 611)

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For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of h2/ky.Cz is around____________________?

A. 0.60
B. 0.24
C. 1
D. 0.72

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Detergent solution is dried to a powder in a ________________________?

A. Spray dryer
B. Spouted bed dryer
C. Tunnel dryer
D. Pan open to atmosphere

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Absorption factor is defined as (where, S1 = slope of the operating line S2 = slope of the equilibrium curve) ____________________?

A. S2/s1
B. S1/s2
C. S1 – s2
D. S1 × s2

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Under conditions of flooding in packed tower, the gas pressure drop___________________?

A. Decreases rapidly
B. Increases rapidly
C. Remain constant
D. Is maximum

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Absorption accompanied with chemical reaction is exemplified by the absorption of___________________?

A. Ammonia in water
B. Benzol present in coke oven gas by wash oil
C. So2 in alkaline solution
D. All a., b. and c.

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In distillation, overhead product contains ______________________?

A. Only one component
B. Two components
C. Any number of components
D. Only saturated liquid

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The caking of crystals can be prevented by _____________________?

A. Maintaining high critical humidity
B. Maintaining low critical humidity
C. Coating the product with inert material
D. Both a. and c.

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Mass transfer co-efficient (K) and diffusivity D. are related according to film theory as______________________?

A. K ∝ d
B. K ∝√d
C. K ∝ d1.5
D. K ∝ d2

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On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in______________________?

A. Greater degree of separation with a fixed number of trays
B. Increased reboiler load
C. Increased reflux ratio
D. None of these

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In a counter-current liquid extractor___________________?

A. Both liquids flow at fixed rate
B. Both liquids can have any desired flow rate
C. Only one of the liquids may be pumped at any desired rate
D. Liquid’s flow rate depends upon the temperature and pressure

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