Q.1
A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be
Q.2
The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P.
Q.3
The central air conditioning system has ___________ overall efficiency as compared to individual systems.
Q.4
For air conditioning the operation theater in a hospital, the percentage of outside air in the air supplied is
Q.5
The bank of tubes at the back of domestic refrigerator is
Q.6
The C.O.P. of a Carnot refrigerator in winter will be _________ as compared to C.O.P. in summer.
Q.7
The vapour compression refrigerator employs the following cycle
Q.8
The atmospheric air at dry bulb temperature of 15°C enters a heating coil maintained at 40°C. The air leaves the heating coil at 25°C. The bypass factor of the heating coil is
Q.9
Carbon dioxide is
Q.10
On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process
Q.11
For better C.O.P of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be
Q.12
Choose the correct statement
Q.13
The wet bulb temperature at 100% relative humidity is ________ dry bulb temperature.
Q.14
In a reversed Brayton cycle, the heat is absorbed by the air during
Q.15
The humidification process, on the psychrometric chart is shown by
Q.16
The C.O.P. of a heat pump working on a reversed Carnot cycle is
Q.17
Critical pressure of a liquid is the pressure
Q.18
The curved lines on a psychrometric chart indicates
Q.19
The horizontal and non-uniformly spaced lines on a psychrometric chart indicates
Q.20
In a pressure enthalpy chart, the space to the left of the saturated liquid line represents
Q.21
The vertical and uniformly spaced lines on a psychrometric chart indicates
Q.22
The index which correlates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as
Q.23
The mass of water vapour present in __________ is called absolute humidity.
Q.24
An Electrolux refrigerator is called a _________ absorption system.
Q.25
For unsaturated air, the dew point temperature is __________ wet bulb temperature.
Q.26
Where does the lowest temperature occur in a vapour compression cycle?
Q.27
As relative humidity decreases, the dew point temperature will be ________ wet bulb temperature.
Q.28
While designing the refrigeration system of an aircraft, the prime consideration is that the
Q.29
In aqua ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in
Q.30
Air refrigeration operates on
0 h : 0 m : 1 s