| 1. | The minimum work required for a three stage reciprocating air compressor is........ the work required for each stage ? | |
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equal to
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double
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three times
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six times
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Report Question| 2. | In a jet engine, the air-fuel ratio is ? | |
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30:1
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40:1
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50:1
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60:1
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| 3. | When the outlet angle from the rotor of a centrifugal compressor is more than 90°, then the blades are said to be ? | |
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forward curved
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backward curved
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radial
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none of these
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| 4. | In a single stage, single acting reciprocating air compressor without clearance volume. the workdone is maximum during ance volume ? | |
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isothermal compression
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isentropic compression
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polytropic compression
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none of these
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| 5. | In a double acting compressor, the air is compressed ? | |
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in one cylinder
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in two cylinders
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in a single cylinder on both sides of the piston
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in two cylinders on both sides of the piston
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| 6. | In a centrifugal compressor, the flow of air is ............. to the axis of compressor ? | |
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parallel
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perpendicular
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inclined
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none of these
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| 7. | The mass of gas turbine per kW developed is about ............. as that of an I.C. engine ? | |
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same
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one-half
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one-fourth
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one-sixth
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| 8. | The ratio of the discharge pressure to the inlet pressure of air is called ? | |
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compression ratio
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expansion ratio
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compressor efficiency
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volumetric efficiency
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| 9. | The degree of reaction is usually kept ........... for all types of axial flow compressors ? | |
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0.2
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0.3
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0.4
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0.5
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| 10. | Which of the following statement is correct as regard to centrifugal compressors ? | |
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The flow of air is parallel to the axis of the compressor
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The static pressure of air in the impeller increases in order to provide centripetal force on the air
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The impeller rotates at high speeds
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The maximum efficiency is higher than multi-stage axial flow compressors
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