Mechanical Engineering

Question: Intercooling in multi-stage compressors is done
[A].

to cool the air during compression

[B].

to cool the air at delivery

[C].

to enable compression in two stages

[D].

to minimise the work of compression

Answer: Option D

Explanation:

No answer description available for this question.

Question: In a two stage reciprocating compressor with intercooler, the amount of work saved with incomplete intercooling is __________ that in case of complete intercooling.
[A].

less than

[B].

more than

Answer: Option A

Explanation:

No answer description available for this question.

Question: The assumption made in two stage compression with intercooler is that
[A].

there is no pressure drop in the intercooler

[B].

the compression in both the cylinders is polytropic

[C].

the suction and delivery of air takes place at constant pressure

[D].

all of the above

Answer: Option D

Explanation:

No answer description available for this question.

Question: Workdone by a two-stage reciprocating air compressor per cycle is equal to the workdone in LP. cylinder and H.P. cylinder.
[A].

True

[B].

False

Answer: Option A

Explanation:

No answer description available for this question.

Question: Intercooling in compressors results in saving of power in compressing given volume of air to a given pressure.
[A].

Correct

[B].

Incorrect

Answer: Option A

Explanation:

No answer description available for this question.

Question: Workdone by an air compressor __________ upon the way in which the air is compressed.
[A].

depends

[B].

does not depend

Answer: Option A

Explanation:

No answer description available for this question.

Question: A 3 m3/min compressor means that it
[A].

compresses 3 m3/min of standard air

[B].

compresses 3 m3/ min of free air

[C].

delivers 3 m3/ min of compressed air

[D].

delivers 3 m3/ min of compressed air at delivery pressure

Answer: Option B

Explanation:

No answer description available for this question.

Question: In a reciprocating air compressor, the compression work per kg of air
[A].

increases as clearance volume increases

[B].

decreases as clearance volume increases

[C].

is independent of clearance volume

[D].

increases as clearance volume decreases

Answer: Option C

Explanation:

No answer description available for this question.

Question: A large clearance Volume in a reciprocating compressor results in
[A].

reduced volume flow rate

[B].

increased volume flow rate

[C].

lower suction pressure

[D].

lower delivery pressure

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a single stage, single acting reciprocating air compressor, without clearance, the workdone on the air during isentropic compression is __________ the heat required to raise the temperature of air from T1 to T2 at a constant pressure.
[A].

equal to

[B].

less than

[C].

greater than

Answer: Option A

Explanation:

No answer description available for this question.