Q.1
Pick up the wrong statement. A refrigerant should have
Q.2
For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then
Q.3
The operating pressure for refrigerating units using R-12 as a refrigerant is
Q.4
The sensible heat factor during cooling and dehumidification process is given by (where h₁ = Enthalpy of air entering the cooling coil, h₂ = Enthalpy of air leaving the cooling coil, and hA = Enthalpy of air at the end of dehumidification process)
Q.5
In chemical dehumidification process,
Q.6
The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called
Q.7
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called
Q.8
The capillary tube, as an expansion device, is used in
Q.9
Which of the following statement is correct?
Q.10
Which of the following statement is correct?
Q.11
The specific humidity during heating and humidification process.
Q.12
Superheating in a refrigeration cycle
Q.13
For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is ________ that for counter flow.
Q.14
For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of
Q.15
R-12 is generally preferred over R-22 in deep freezers since
Q.16
A good refrigerant should have
Q.17
In which of the following refrigeration system, waste heat can be effectively used?
Q.18
Environmental protection agencies advice against the use of chlorofluorocarbon refrigerants since
Q.19
The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)
Q.20
In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by
Q.21
Which of the following statement is correct?
Q.22
Choose the wrong statement
Q.23
In a refrigeration system, the expansion device is connected between the
Q.24
The human body feels comfortable when the heat stored in the body is
Q.25
The emissivity of a polished silver body is _________ as compared to black body.
Q.26
Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure, ps = Pressure of saturated air, pd = Pressure at dry bulb temperature, pw = Saturation pressure corresponding to wet bulb temperature, and μ = Degree of saturation)
Q.27
During heating and humidification, the final relative humidity of air
Q.28
The thermostatic expansion valve is used in ________ type of evaporators.
Q.29
In a psychrometric process, the sensible heat added is 30 kJ/s and the latent heat added is 20 kJ/s. The sensible heat factor for the process will be
Q.30
The lowest thermal diffusivity is of
0 h : 0 m : 1 s