Refrigeration And Air Conditioning Mcqs
Q.1: Pick up the incorrect statement?
A. lithium bromide used in vapour absorption cycle is nonvolatile>
B. lithium bromide plant cant operate below 0C0
C. a separator is used in lithium bromide plant to remove the unwanted water vapour by condensing^
D. concentration of solution coming out of lithium bromide generator is more in comparison to that entering the generatorv
Q.2: Choose the wrong statement ?
A. Temperature of medium being cooled must be below that of the evaporatorG
B. Refrigerant leaves the condenser as liquid*
C. All solar thermally operated absorption systems are capable only of intermittent operationZ
D. frost on evaporator reduces heat transfer)
Q.3: Choose the correct statement?
A. A refrigerant should have low latent heat)
B. If operating temperature of system is low, then refrigerant with low boiling point should be useda
C. Precooling and subcooling bf refrigerant are same1
D. Superheat and sensible heat of a. refrigerant are same6
Q.4: In a vapor compression cycle, the refrigerant immediately after expansion valve is___________________?f
A. liquid
B. sub-cooled liquid
C. saturated liquid
D. wet vapour
Q.5: Absorption system normally uses the following refrigerant___________________?M
A. Freon-11
B. Freon-22
C. C02
D. S02
Q.6: Highest temperature encountered in refrigeration cycle should be________________?Q
A. near critical temperature of refrigerant(
B. above critical temperature
C. at critica. temperature
D. much below critical temperature
Q.7: One of the purposes of sub-cooling the liquid refrigerant is to________________?P
A. reduce compressor overheating
B. reduce compressor discharge temperature'
C. increase cooling effect
D. ensure that only liquid and not the vapour enters the expansion (throttling) valveR
Q.8:
A. more
B. less
C. same
D. more for small capacity and less for high capacity2
Q.9: Formation of frost on evaporator in refrigerator ________________?B
A. results in loss of heat due to poor heat transfer1
B. increases heat transfer rate
C. is immaterial
D. can be avoided by proper design
Q.10: At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant_________________?g
A. decreases
B. increases
C. remains same
D. depends on other factors

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