Chemical Engineering Basics

Question: With increase in compression ratio, the volumetric efficiency of air compressor
[A].

increases.

[B].

decreases.

[C].

remains same.

[D].

may increase or decrease (depends on the suction pressure).

Answer: Option A

Explanation:

No answer description available for this question.

Question: ‘End cooler’ or ‘after cooler’ is employed in air compressor mainly to
[A].

remove oil vapour or moisture from air.

[B].

cool the dry air before use.

[C].

reduce the volumetric capacity of receiver.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be
[A].

more

[B].

less

[C].

same

[D].

either more or less; depends on the climatic conditions.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.
[A].

invar

[B].

hastealloy

[C].

duralumin

[D].

monel metal

Answer: Option A

Explanation:

No answer description available for this question.

Question: Kinematic viscosity of water as compared to that of air is
[A].

more

[B].

same

[C].

15% more

[D].

15% less

Answer: Option D

Explanation:

No answer description available for this question.

Question: Out of the following, the __________ pipe has the least corrosion resistance.
[A].

mild steel

[B].

copper

[C].

cast iron

[D].

wrought iron

Answer: Option D

Explanation:

No answer description available for this question.

Question: A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its
[A].

aqueous tension.

[B].

saturated humidity.

[C].

vapor pressure.

[D].

absolute humidity.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Heat release during phase change is observed in case of a/an
[A].

boiler

[B].

condenser

[C].

evaporator

[D].

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

Answer: Option B

Explanation:

No answer description available for this question.

Question: Out of the following, the materials having maximum magnetic permeability is
[A].

silicon steel (Si = 4%)

[B].

cast iron

[C].

wrought iron

[D].

mild steel

Answer: Option A

Explanation:

No answer description available for this question.

Question: Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter.
[A].

bomb

[B].

throttling

[C].

Junker’s

[D].

Boy’s

Answer: Option B

Explanation:

No answer description available for this question.