Mechanical Engineering :: Refrigeration and Air Conditioning
- In vapour compression refrigeration system, refrigerant occurs as liquid between
- The total pressure exerted by the mixture of air and water vapour is equal to the sum of pressures which each constituent would exert, if it occupied the same space by itself. This statement is called
- Which of the following statement is wrong?
- Which of the following statement is wrong?
- In S.J. unit, one ton of refrigeration is equal to
- While designing the refrigeration system of an aircraft, the prime consideration is that the
- In aqua ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in
- Air refrigeration operates on
- The C.O.P. of an absorption type refrigerator is given by (where T₁ = Temperature at which the working substance receives heat, T₂ = Temperature of cooling water, and T₃ = Evaporator temperature)
- Critical temperature is the temperature above which
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A.
The value of C.O.P. is always greater than one |
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B.
In a vapour compression system, the condition of refrigerant before entering the compressor is dry saturated vapour |
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C.
The space between the saturated liquid line and saturated vapour line, in a pressure enthalpy chart, is wet vapour region |
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D.
None of the above |
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A.
The performance of the vapour compression refrigerator varies considerably with both vaporising and condensing temperatures. |
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B.
In vapour compression cycle, the useful part of the heat transfer is at the condenser. |
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C.
In ammonia-hydrogen (Electrolux) refrigerator, no compressor, pump or fan is required. |
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D.
The effect of under-cooling the liquid refrigerant is to decrease the coefficient of performance. |