Chemical Engineering Basics

Question: Desert air coolers being rendered ineffective in rainy season is due to
[A].

low humidity

[B].

low temperature

[C].

high humidity

[D].

sunny weather

Answer: Option C

Explanation:

No answer description available for this question.

Question: __________ is the most suitable lubricant for drawing mild steel wires?
[A].

Kerosene

[B].

Water

[C].

Sodium stearate

[D].

Lime water

Answer: Option C

Explanation:

No answer description available for this question.

Question: Gas carrying pipelines are best joined by
[A].

nuts & bolts

[B].

rivetting

[C].

welding

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Metals in general have a low value of thermal
[A].

conductivity

[B].

diffusivity

[C].

inertia

[D].

all (a), (b) & (c)

Answer: Option C

Explanation:

No answer description available for this question.

Question: Inertial forces are obtained, when the elastic forces are multiplied by __________ number.
[A].

Mach

[B].

Froude

[C].

Reynolds

[D].

Euler

Answer: Option A

Explanation:

No answer description available for this question.

Question: Induced draft fans provided in large thermal power plant boilers have __________ blades.
[A].

forward curved

[B].

backward curved

[C].

double curved

[D].

radial or straight

Answer: Option B

Explanation:

No answer description available for this question.

Question: Air refrigeration cycle is used in the air crafts, because of
[A].

low temperature encountered at high altitude.

[B].

its high heat transfer rate.

[C].

its low unit weight per ton of refrigeration.

[D].

its higher co-efficient of performance (COP).

Answer: Option C

Explanation:

No answer description available for this question.

Question: During sensible heating of humid air
[A].

relative humidity increases.

[B].

dew point remains constant.

[C].

dry bulb & wet bulb temperature increases.

[D].

both ‘b’ & ‘c’.

Answer: Option D

Explanation:

No answer description available for this question.

Question: The boiling & freezing points on a newly defined temperature scale in degree ‘D’ are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to __________ °D.
[A].

140

[B].

180

[C].

240

[D].

280

Answer: Option D

Explanation:

No answer description available for this question.

Question: Which of the following pair is correctly matched?
[A].

Heat transfer: Thermal diffusivity.

[B].

Mass transfer: Diffusion co-efficient.

[C].

Momentum transfer: Kinematic viscosity.

[D].

all ‘a’, ‘b’ & ‘c’ are correctly matched.

Answer: Option D

Explanation:

No answer description available for this question.