371. The formation of frost on cooling coils in a refrigerator
increases heat transfer
improves C.O.P. of the system
increases power consumption
reduces power consumption
✅ The correct answer is option C.
Heat Transfer, Refrigeration and Air Conditioning MCQs
372. The critical radius is the insulation radius at which the resistance to heat flow is
maximum
minimum
zero
none of these
✅ The correct answer is option B.
373. The subcooling in a refrigeration cycle
does not alter C.O.P.
increases C.O.P.
decreases C.O.P.
none of these
✅ The correct answer is option B.
374. In case of solids, the heat transfer takes place according to radiation.
Correct
Incorrect
✅ The correct answer is option B.
375. During adiabatic saturation process on unsaturated air __________ remains constant.
relative humidity
dew point temperature
dry bulb temperature
wet bulb temperature
✅ The correct answer is option D.
376. The humidity ratio or specific humidity is the mass of water vapour present in
1 m3 of wet air
1 m3 of dry air
1 kg of wet air
1 kg of dry air
✅ The correct answer is option D.
377. A water cooled condenser operates at a __________ condensing temperature than an air-cooled condenser.
higher
lower
✅ The correct answer is option B.
378. 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
0.3
0.6
0.67
1.5
✅ The correct answer is option B.
379. The heat transfer by radiation __________ a medium.
[A]. requires
[B]. does not require
null
null
✅ The correct answer is option B.
380. The highest thermal diffusivity is of
[A]. iron
[B]. lead
[C]. concrete
[D]. wood
✅ The correct answer is option B.