Gas Dynamics and Gas Turbines

Question: For perfect intercooling in a three stage compressor,
[A].

[B].

[C].

p1p2 = p3p4

[D].

p1p3 = p2p4

Answer: Option A

Explanation:

No answer description available for this question.

Question: For perfect intercooling in a two stage compressor,
[A].

[B].

[C].

p1 = p3

[D].

p1 = p2p3

Answer: Option A

Explanation:

No answer description available for this question.

Question: For minimum work required to compress and deliver a quantity of air by multi-stage compression,
[A].

the compression ratio in each stage should be same

[B].

the intercooling should be perfect

[C].

the workdone in each stage should be same

[D].

all of the above

Answer: Option D

Explanation:

No answer description available for this question.

Question: In a high pressure compressor, the delivery pressure is
[A].

1 to 5 bar

[B].

5 to 8 bar

[C].

8 to 10 bar

[D].

10 to 15 bar

Answer: Option C

Explanation:

No answer description available for this question.

Question: A compressor at high altitudes will require __________ power.
[A].

same

[B].

less

[C].

more

Answer: Option B

Explanation:

No answer description available for this question.

Question: An aftercooler is used to
[A].

remove impurities from air

[B].

reduce volume of air

[C].

cause moisture and oil vapour to drop out

[D].

cool the air

Answer: Option C

Explanation:

No answer description available for this question.

Question: A receiver in compressor installations is used to damp pressure waves in compressor discharge.
[A].

Yes

[B].

No

Answer: Option A

Explanation:

No answer description available for this question.

Question: If p1 is the pressure of air entering the L.P, cylinder and p3 is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by
[A].

D1/D2 = (p1p3)1/2

[B].

D1/D2 = (p1/p3)1/4

[C].

D1/D2 = (p1p3)1/4

[D].

D1/D2 = (p3/p1)1/4

Answer: Option D

Explanation:

No answer description available for this question.

Question: If p1, is the pressure of air entering the L.P. cylinder and p2 is the pressure of air leaving the L.P. cylinder (or intercooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where D1 = Dia. of L.P. cylinder, and D2 = Dia. of H.P. cylinder)
[A].

D1/D2 = p1p2

[B].

D1/D2 = p1/p2

[C].

D1/D2 = p2/p1

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: For minimum work in multi-stage compression, the workdone on all stages should be equal.
[A].

Yes

[B].

No

Answer: Option A

Explanation:

No answer description available for this question.