101. The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by
(C.O.P.)P = (C.O.P.)R + 2
(C.O.P.)P = (C.O.P.)R + 1
(C.O.P)P = (C.O.P)R – 1
(C.O.P)P = (C.O.P)R
✅ The correct answer is option B.
Heat Transfer, Refrigeration and Air Conditioning MCQs
102. 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
✅ The correct answer is option B.
104. The sulphur sticks, in case of leakage of ammonia refrigerant, gives white smoke.
TRUE
FALSE
✅ The correct answer is option A.
105. In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by
liquid pump
generator
absorber and generator
absorber, generator an
✅ The correct answer is option D.
106. Fourier’s law of heat conduction gives the heat flow for
irregular surfaces
non-uniform temperature surfaces
one dimensional cases only
two dimensional cases
✅ The correct answer is option C.
107. An infinite parallel planes with emissivities e1 and e2, the interchange factor for radiation from surface 1 to surface 2 is given by
e1 + e2
e1e2
✅ The correct answer is option A.
108. The temperature of air recorded by a thermometer, when it is not effected by the moisture present in the air, is called
wet bulb temperature
dry bulb temperature
dew point temperature
none of these
✅ The correct answer is option B.
109. Conduction is a process of heat transfer
from one particle of the body to another without the actual motion of the particles
from one particle of the body to another by the actual motion of the heated particles.
from a hot body to a cold body, in a straight line, without affecting the intervening medium
none of the above
✅ The correct answer is option A.
110. In a boot-strap air evaporative cooling system, the evaporator is provided
between the combustion chamber and the first heat exchanger
between the first heat exchanger and the secondary compressor
between the secondary compressor and the second heat exchanger
between the second hea
✅ The correct answer is option D.