compressors-gas-dynamics-and-gas-turbines mechanical-engineering question and answers -Page 13

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Compressors, Gas Dynamics and Gas Turbines problems

3. In air compressors, free air delivery means the
Options
A. actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
B. volume of air delivered by the compressor
C. volume of air sucked by the compressor during its suction stroke
D. none of the above

5. Which of the following statement is correct?
Options
A. The reciprocating compressors are best suited for high pressure and low volume capacity
B. The effect of clearance volume on power consumption is negligible for the same volume of discharge
C. both (a) and (b)
D. none of these

6. If the flow of air through the compressor is parallel to its axis, then the compressor is
Options
A. reciprocating compressor
B. centrifugal compressor
C. axial flow compressor
D. turbo-compressor

7. For minimum work required to compress and deliver a quantity of air by multi-stage compression,
Options
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

8. A turbo-prop is preferred to turbo-jet because
Options
A. it has high propulsive efficiency at high speeds
B. it can fly at super sonic speeds
C. it can fly at high elevations
D. it has high power for take off

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