Q.1
In a refrigeration cycle, the flow of refrigerant is controlled by
Q.2
The superheating in a refrigeration cycle
Q.3
Vapour compression refrigeration is somewhat like
Q.4
The general rule for rating refrigeration systems (excepting for CO₂ system) is to approximate following h.p. per ton of refrigeration
Q.5
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant
Q.6
The freezing point of R-12 is
Q.7
The value of C.O.P in vapour compression cycle is usually
Q.8
During cooling and dehumidification, dry bulb temperature
Q.9
The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by
Q.10
The specific humidity during cooling and dehumidification
Q.11
The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is
Q.12
In a domestic vapour compression refrigerator, the refrigerant commonly used is
Q.13
In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be
Q.14
Cooling water is required for following equipment in ammonia absorption plant
Q.15
In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
Q.16
In a refrigeration system, heat absorbed in comparison to heat rejected is
Q.17
The minimum temperature to which water can be cooled in a cooling tower is
Q.18
Air refrigeration cycle is used in
Q.19
A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is
Q.20
Reducing suction pressure in refrigeration cycle
Q.21
Nusselt number (NN) is given by
Q.22
The coefficient of performance of a domestic refrigerator is ________ as compared to a domestic air-conditioner.
Q.23
In aqua ammonia and Lithium bromide water absorption refrigeration systems, the refrigerants are respectively
Q.24
The sub-cooling in a refrigeration cycle
Q.25
In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)
Q.26
The undesirable property of a refrigerant is
Q.27
The desirable property of a refrigerant is
Q.28
In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature
Q.29
During heating and dehumidification process, dry bulb temperature
Q.30
The sensible heat factor during the heating and humidification process is given by (where h₁ = Enthalpy of air entering the heating coil, h₂ = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)
0 h : 0 m : 1 s