71. During gas charging in an ammonia vapour compression system, the connection is made at the compressor outlet.
Agree
Disagree
✅ The correct answer is option A.
Heat Transfer, Refrigeration and Air Conditioning MCQs
72. The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as
conduction
free convection
forced convection
radiation
✅ The correct answer is option C.
73. According to Stefan-Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the
absolute temperature
square of the absolute temperature
cube of the absolute temperature
fourth power of the ab
✅ The correct answer is option D.
75. Air refrigeration cycle is used in
commercial refrigerators
domestic refrigerators
air-conditioning
gas liquefaction
✅ The correct answer is option D.
76. In a lithium bromide absorption refrigeration system
lithium bromide is used as a refrigerant and water as an absorbent
water is used as a refrigerant and lithium bromide as an absorbent
ammonia is used as a refrigerant and lithium bromide as an absorbent
none of the above
✅ The correct answer is option B.
77. In order to collect liquid refrigerant and to prevent it from going to a __________ , a device known as accumulator is used at the suction of compressor.
compressor
condenser
expansion valve
evaporator
✅ The correct answer is option A.
78. Free convection flow depends on
density
coefficient of viscosity
gravitational force
all of these
✅ The correct answer is option D.
79. When tc1 and tc2 are the temperatures of cold fluid at entry and exit respectively and th1 and th2 are the temperatures of hot fluid at entry and exit point, and cold fluid has lower heat capacity rate as compared to hot fluid, then effectiveness of the heat exchanger is given by
✅ The correct answer is option D.
80. In a parallel flow heat exchanger, the rate of flow of heat and the rate of decrease of temperature are maximum.
Yes
No
✅ The correct answer is option A.