CHEMICAL ENGINEERING

Question: If f is defined as above, then which of the following applies to a feed at dew point ?
[A].

f = 1

[B].

f < 1

[C].

f > 1

[D].

0 < f < 1

Answer: Option A

Explanation:

No answer description available for this question.

Question: Flash distillation is suitable for separating the constituents of a binary system, which
[A].

form minimum boiling azeotrope.

[B].

have very wide boiling points.

[C].

have very close boiling points.

[D].

form constant boiling azeotrope.

Answer: Option B

Explanation:

No answer description available for this question.

Question: If f = moles of vapour present per mole of feed, then the slope of feed line is (Mcabe-Thiele method)
[A].

[B].

[C].

[D].

Answer: Option C

Explanation:

No answer description available for this question.

Question: Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the
[A].

mass transfer co-efficient.

[B].

thermal diffusivity.

[C].

kinematic viscosity.

[D].

volumetric diffusivity.

Answer: Option A

Explanation:

No answer description available for this question.

Question: 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’

Answer: Option A

Explanation:

No answer description available for this question.

Question: Diffusion in concentrated solutins differs from that in dilute solutions, because of the change in the __________ with the concentration of the solution.
[A].

degree of ideality

[B].

viscosity

[C].

both ‘a ‘& ‘b’

[D].

neither ‘a’ nor ‘b’

Answer: Option C

Explanation:

No answer description available for this question.

Question: Dew point of an air-water vapor mixture
[A].

decreases with decrease in pressure.

[B].

at constant humidity & total pressure is fixed.

[C].

corresponding to any point on the humidity chart is obtained by projecting a line through this point parallel to the temperature axis and to the saturation curve.

[D].

all ‘a’, ‘b’ & ‘c’.

Answer: Option D

Explanation:

No answer description available for this question.

Question: During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.
[A].

wet bulb temperature

[B].

partial pressure of water vapor

[C].

relative humidity

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Dry bulb temperature of unsaturated air is more than its __________ temperature.
[A].

dew point

[B].

wet bulb

[C].

both ‘a’ & ‘b’

[D].

neither ‘a’ nor ‘b’

Answer: Option C

Explanation:

No answer description available for this question.

Question: Batch tray dryers suffers from the disadvantage of
[A].

high maintenance cost.

[B].

non-uniform & low production rate.

[C].

high labour cost & low heat economy.

[D].

all ‘a’, ‘b’ & ‘c’.

Answer: Option C

Explanation:

No answer description available for this question.