| 1. | In a reciprocating air compressor, the compression work per kg of air ? | |
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increases as clearance volume increases
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decreases as clearance volume increases
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is independent of clearance volume
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increases as clearance volume decreases
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Report Question| 2. | A rotary compressor is driven by an ? | |
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electric motor
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engine
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either (a) or (b)
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none of these
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| 3. | In air compressors, free air delivery means the ? | |
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actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
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volume of air delivered by the compressor
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volume of air sucked by the compressor during its suction stroke
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none of the above
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| 4. | The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as ? | |
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compressor efficiency
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volumetric efficiency
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isothermal efficiency
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mechanical efficiency
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| 5. | If the flow of air through the compressor is parallel to its axis, then the compressor is ? | |
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reciprocating compressor
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centrifugal compressor
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axial flow compressor
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turbo-compressor
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| 6. | In a closed cycle gas turbine, the air is compressed ? | |
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isothermally
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polytropically
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isentropically
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none of these
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| 7. | The overall isothermal efficiency of the compressor is defined as ? | |
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work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio
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isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor
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volume of free air delivery per stroke to the swept volume of the piston
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isentropic power to the power required to drive the compressor
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| 8. | Which of the following statement is correct ? | |
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The ratio of the discharge pressure to the inlet pressure of air is called compressor efficiency
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The compression ratio for the compressor is always greater than unity
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The compressor capacity is the ratio of workdone per cycle to the stroke volume
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During isothermal compression of air, the workdone in a compressor is maximum
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| 9. | The overall efficiency of the compressed air system is the ? | |
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ratio of shaft output of the air motor to the shaft input to the compressor
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ratio of shaft input to the compressor to the shaft output of air motor
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product of shaft output of air motor and shaft input to the compressor
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none of the above
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| 10. | The compressor capacity is defined as the ? | |
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actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
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volume of air delivered by the compressor
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volume of air sucked by the compressor during its suction stroke
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none of the above
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