Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

21.
It is desired to condition the outside air from 70% relative humidity and 45° C dry bulb temperature to 50% relative humidity and 25° C dry bulb temperature (room condition). The practical arrangement will be
dehumidification
cooling and humidification
cooling and dehumidification
dehumidification and pure sensible cooling
Answer: Option
Explanation:
No answer description is available. Let's discuss.

22.
During heating and dehumidification process, dry bulb temperature
remains constant
increases
decreases
Answer: Option
Explanation:
No answer description is available. Let's discuss.

23.
The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T1 = Lowest absolute temperature, and T2 = Highest absolute temperature)
Answer: Option
Explanation:
No answer description is available. Let's discuss.

24.
A refrigerant compressor is used to
raise the pressure of the refrigerant
raise the temperature of the refrigerant
circulate the refrigerant through the refrigerating system
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.

25.
In which of the following refrigeration system, waste heat can be effectively used?
Vapour compression cycle
Vapour absorption cycle
Air refrigeration cycle
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.