Chemical Engineering - Mass Transfer

1. 

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.

Answer: Option C

Explanation:

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2. 

__________ column is the most suitable for achieving the best performance for mass transfer operations involving liquid with dispersed solids.

A. Watted wall
B. Packed
C. Plate
D. Spray

Answer: Option C

Explanation:

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3. 

Deairation (removal of O2) of water is done by

A. rectification
B. absorption
C. ion-exchange
D. adsorption

Answer: Option C

Explanation:

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4. 

Make up water is supplied during cooling tower operation to compensate for water losses due to

A. evaporation
B. blowdown
C. entrainment
D. all (a), (b)&(c)

Answer: Option D

Explanation:

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5. 

Pick out the wrong statement.

A. The mole fraction of solute is directly proportional to the molality of a 'dilute' solution.
B. For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both components is nonlinear in the case of steady state unimolal unidirectional diffusion.
C. Azeotropes obey Raoult's law at all temperature.
D. The relative volatility of a binary mixture at the azeotropic composition is 1.

Answer: Option C

Explanation:

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