Compressors, Gas Dynamics and Gas Turbines - Section 1 (6)

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Compressors, Gas Dynamics and Gas Turbines - Section 1

41.

An open cycle gas turbine works on the same cycle as that of a closed cycle gas turbine.

A.	Yes
B.	No

Answer: Option A

Explanation:

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42.

In a jet propulsion

A.	the propulsive matter is ejected from within the propelled body
B.	the propulsive matter is caused to flow around the propelled body
C.	its functioning does not depend upon presence of air
D.	none of the above

Answer: Option B

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43.

The total heat rejected in a reciprocating air compressor is equal to the sum of the heat rejected during polytropic compression per kg of air and heat rejected in the intercooler per kg of air.

A.	True
B.	False

Answer: Option A

Explanation:

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44.

The stagnation pressure rise in a centrifugal compressor takes place

A.	in the diffuser only
B.	in the impeller only
C.	in the diffuser and impeller
D.	in the inlet guide vanes only

Answer: Option C

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45.

The rotary compressors are suitable for large discharge of air at low pressure.

A.	True
B.	False

Answer: Option A

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46.

The maximum temperature in a gas turbine is

A.	200°C
B.	500°C
C.	700°C
D.	1000°C

Answer: Option C

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47.

The volumetric efficiency for reciprocating air compressors is about

A.	10 to 40%
B.	40 to 60%
C.	60 to 70%
D.	70 to 90%

Answer: Option D

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48.

A rocket works with maximum overall efficiency when air-craft velocity is __________ the jet velocity.

A.	equal to
B.	one-half
C.	double

Answer: Option B

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