| 1. | An aftercooler is used to ? | |
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remove impurities from air
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reduce volume of air
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cause moisture and oil vapour to drop out
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cool the air
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Report Question| 2. | The air cooling system mostly used in transport type aircrafts is ? | |
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simple air cooling system
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simple evaporative air cooling system
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boot-strap air cooling system
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all of these
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| 3. | In a boot-strap air evaporative cooling system, the evaporator is provided ? | |
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between the combustion chamber and the first heat exchanger
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between the first heat exchanger and the secondary compressor
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between the secondary compressor and the second heat exchanger
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between the second heat exchanger and the cooling turbine
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| 4. | While designing the refrigeration system of an aircraft, the prime consideration is that the ? | |
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system has high C.O.P.
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power per TR is low
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mass of refrigerant circulated in the system is low
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mass of the refrigeration equipment is low
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| 5. | In a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is ? | |
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high pressure saturated liquid
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wet vapour
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very wet vapour
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dry vapour
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| 6. | In electrolux refrigerator ? | |
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ammonia is absorbed in hydrogen
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ammonia is absorbed in water
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ammonia evaporates in hydrogen
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hydrogen evaporates in ammonia
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| 7. | The undesireable property of a refrigerant is ? | |
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non-toxic
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non-flammable
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non-explosive
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high boiling point
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| 8. | The leakage in a refrigeration system using freon is detected by ? | |
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halide torch
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sulphur sticks
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soap and water
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all of these
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| 9. | The ratio of heat extracted in the refrigerator to the workdone on the refrigerant is called ? | |
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coefficient of performance of refrigeration
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coefficient of performance of heat pump
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relative coefficient of performance
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refrigerating efficiency
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| 10. | The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as ? | |
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Wien's law
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Stefan's law
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Kirchhoff's law
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Planck's law
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