| 1. | In the aircraft propellers ? | |
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the propulsive matter is ejected from within the propelled body
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the propulsive matter is caused to flow around the propelled body
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its functioning does not depend upon the presence of air
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none of the above
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Report Question| 2. | In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in ? | |
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exit nozzle, which is a constant volume process
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exit nozzle, which is essentially an isentropic process
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turbine blades, which is a constant volume process
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turbine blades, which is essentially an isentropic process
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| 3. | The mean effective pressure of the compressor is 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 gas in cooling chamber of a closed cycle gas turbine is cooled at ? | |
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constant volume
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constant temperature
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constant pressure
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none of these
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| 5. | In open cycle turbo-jet engines used in military aircraft, reheating the exhaust gas from the turbine by burning, more fuel is used to increase the ? | |
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thrust and range of aircraft
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efficiency of the engine
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both (a) and (b)
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none of these
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| 6. | In a centrifugal compressor, the ratio of the ........... to the blade velocity is called slip factor ? | |
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inlet whirl velocity
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outlet whirl velocity
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inlet velocity of flow
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outlet velocity of flow
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| 7. | The compressed air may be used ? | |
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in gas turbine plants
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for operating pneumatic drills
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in starting and supercharging of I.C. engines
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all of the above
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| 8. | The thrust of a jet propulsion power unit can be increased by ? | |
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injecting water into the compressor
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burning fuel after gas turbine
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injecting ammonia into the combustion chamber
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all of the above
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| 9. | In a single acting reciprocating air compressor, without clearance, the compression of air may be ? | |
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isothermal
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polytropic
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isentropic
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any one of these
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| 10. | The velocity of air entering in a rocket is ........ as compared to an aircraft ? | |
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zero
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less
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more
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same
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