Mechanical Engineering - Compressors, Gas Dynamics and Gas Turbines

Exercise :: Compressors, Gas Dynamics and Gas Turbines - Section 1

46. 

The increase in pressure in a roots blower is entirely due to back flow of air.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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47. 

The type of rotary compressor used in aeroplanes, is of

A. centrifugal type
B. axial flow type
C. radial flow type
D. none of these

Answer: Option B

Explanation:

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48. 

An axial compressor gives optimum performance at high speeds and large volume flows.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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49. 

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:

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50. 

The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the

A. rotor to static enthalpy rise in the stator
B. stator to static enthalpy rise in the rotor
C. rotor to static enthalpy rise in the stage
D. stator to static enthalpy rise in the stage

Answer: Option C

Explanation:

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