Chemical Engineering MCQs

6108 MCQs (Page 162 of 611)

Attempt Chemical Engineering Quiz

The boiling points of pure components of a binary system ________________ with increase in total pressure of the system ?

A. Decreases
B. Increases
C. Remains unchanged
D. May increase or decrease, depends on the system

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Large scale usage of flash distillation is practised in __________________?

A. Soap manufacturing
B. Ammonia synthesis plant
C. Polymerisation industry
D. Petroleum refining

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The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same system is_______________________?

A. 100
B. 10
C. 5
D. 1

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In gas-liquid contact operation, the number of ideal stages, N = (xa – xb)/(xb – x*b). This is true when the stripping factor ‘S’ is ________________?

A. S > 1
B. S < 1
C. S = 1
D. S = ∞

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For stripping of a gas in a counter current stripper, the operating line _____________________?

A. Lies above the equilibrium curve
B. Lies below the equilibrium curve
C. Can lie above or below the equilibrium curve
D. Is always parallel to the equilibrium curve

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Operating velocity in a packed tower is usually __________________ the flooding velocity ?

A. Half
B. Twice
C. Equal to
D. More than

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Which of the following is used for the concentration of rubber latex ?

A. Agitated film evaporator
B. Long tube vertical evaporator
C. Short tube evaporator
D. Calandria

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In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of _______________ is zero?

A. Interface
B. Gas phase
C. Liquid phase
D. All a , b. & c.

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Drying of a solid involves _________________ transfer ?

A. Only heat
B. Only mass
C. Both heat and mass
D. None of these

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Which of the following increases during evaporative cooling process with recirculated water supply ?

A. Wet bulb temperature
B. Relative humidity
C. Partial pressure of vapour
D. Both b. and c.

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