111. The coefficient of performance of a domestic refrigerator is __________ as compared to a domestic air-conditioner.
same
less
more
✅ The correct answer is option B.
Heat Transfer, Refrigeration and Air Conditioning MCQs
112. The specific humidity during heating and humidification process.
remains constant
increases
decreases
✅ The correct answer is option B.
113. 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
✅ The correct answer is option D.
114. Logarithmic mean temperature difference is the same as the arithmetic mean temperature difference.
Agree
Disagree
✅ The correct answer is option B.
115. A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be
1.33
2.33
3.33
4.33
✅ The correct answer is option B.
116. The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called
conduction
convection
radiation
✅ The correct answer is option B.
117. In a shell and coil condenser, water flows in the shell and the refrigerant in the coil.
TRUE
FALSE
✅ The correct answer is option B.
118. The C.O.P. of a Carnot refrigerator in winter will be __________ as compared to C.O.P. in summer.
same
lower
higher
✅ The correct answer is option C.
119. A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h1, h2 and h3 respectively. The average heat transfer coefficient for the cube is
h1 + h2 + h3
(h1h2h3)1/3
none of these
✅ The correct answer is option D.
120. The freezing point of sulphur dioxide is
-56.6°C
-75.2°C
-77.7°C
-135.8°C
✅ The correct answer is option B.