260 Important Refrigeration And Air Conditioning MCQ Question and Answer | PDF Free Download
1.The value of C.O.P in vapour compression cycle is usually
- AAlways less than unity
- BAlways more than unity
- CEqual to unity
- DAny one of the above
2.Air conditioning means
- ACooling
- BHeating
- CDehumidifying
- DAll of these
3.The specific humidity during cooling and dehumidification
- ARemains constant
- BIncreases
- CDecreases
- DNone of these
4.The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is
- ABigger
- BSmaller
- CEqual
- DSmaller/bigger depending on capacity
5.In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
- AIt considerably reduces mass of the system
- BIt improves the C.O.P., as the condenser is small
- CThe positive work in isentropic expansion of liquid is very small
- DIt leads to significant cost reduction
6.In a refrigeration system, heat absorbed in comparison to heat rejected is
- AMore
- BLess
- CSame
- DMore for small capacity and less for high capacity
7.During a refrigeration cycle, heat is rejected by the refrigerant in a
- ACompressor
- BCondenser
- CEvaporator
- DExpansion valve
8.Freon group of refrigerants are
- AInflammable
- BToxic
- CNon-inflammable and toxic
- DNontoxic and non-inflammable
9.The Freon group of refrigerants are
- AHalocarbon refrigerants
- BZoetrope refrigerants
- CInorganic refrigerants
- DHydrocarbon refrigerants
10.The power per tonne of refrigeration is
- A3.5/C.O.P.
- BC.O.P/3.5
- C3.5 × C.O.P.
- DNone of these
11.In a refrigerating machine, heat rejected is _________ heat absorbed.
- AEqual to
- BLess than
- CGreater than
- DNone of these
12.During sensible heating of air _________ decreases.
- AWet bulb temperature
- BRelative humidity
- CDry bulb temperature
- DSpecific humidity
13.During humidification process, __________ increases.
- AWet bulb temperature
- BRelative humidity
- CDry bulb temperature
- DSpecific humidity
14.The boiling point of ________ is 10.5°C.
- AAmmonia
- BR-12
- CSulphur dioxide
- DCarbon dioxide
15.Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system
- AStrong solution to weak solution
- BWeak solution to strong solution
- CStrong solution to ammonia vapour
- DAmmonia vapours to weak solution
16.The optimum effective temperature for human comfort is
- AHigher in winter than in summer
- BLower in winter than in summer
- CSame in winter and summer
- DNot dependent on season
17.An evaporator is also known as
- AFreezing coil
- BCooling coil
- CChilling coil
- DAll of these
18.In a refrigeration cycle, the flow of refrigerant is controlled by
- ACompressor
- BCondenser
- CEvaporator
- DExpansion valve
19.Vapour compression refrigeration is somewhat like
- ACarnot cycle
- BReversed Carnot cycle
- CAll the above
- DNone of the above
20.At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant
- ADecreases
- BIncreases
- Cremains same
- Ddepends on other factors