Q.1
A mixture of dry air and water vapour, when the air has diffused the maximum amount of water vapour into it, is called
Q.2
The wet bulb temperature during sensible heating of air
Q.3
The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T₁ = Lowest absolute temperature, and T₂ = Highest absolute temperature)
Q.4
The relative coefficient of performance is equal to
Q.5
If a gas is to be liquefied, its temperature must be
Q.6
The advantage of dry compression is that
Q.7
The leaks in a refrigeration system using Freon are detected by
Q.8
The higher temperature in vapour compression cycle occurs at
Q.9
Highest temperature encountered in refrigeration cycle should be
Q.10
In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about
Q.11
The capillary tube is not used in large capacity refrigeration systems because
Q.12
Moisture in Freon refrigeration system causes
Q.13
A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be
Q.14
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)
Q.15
The relative humidity is defined as
Q.16
The wet bulb temperature during sensible cooling of air
Q.17
The dry bulb temperature during sensible heating of air
Q.18
Moisture should be removed from refrigerants to avoid
Q.19
Air refrigerator works on
Q.20
The bypass factor of a cooling coil decreases with
Q.21
The formation of frost on cooling coils in a refrigerator
Q.22
The specific humidity during dehumidification process
Q.23
The specific humidity during humidification process
Q.24
The boiling point of ammonia is
Q.25
The ratio of heat extracted in the refrigerator to the work-done on the refrigerant is called
Q.26
The material of pipe lines for a system using Freon as a refrigerant should be
Q.27
The vapour pressure of refrigerant should be
Q.28
The leakage in a refrigeration system using ammonia is detected by
Q.29
The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents
Q.30
Which of the following refrigerant is highly toxic and flammable?
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