260 Important Refrigeration And Air Conditioning MCQ Question and Answer | PDF Free Download
1.A vapour absorption refrigeration system
- AGives noisy operation
- BGives quiet operation
- CRequires little power consumption
- DCools below 0°C
2.In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the
- AExpansion valve to the evaporator
- BEvaporator to the thermostat
- CCondenser to the expansion valve
- DCondenser to the evaporator
3.The difference between dry bulb temperature and dew point temperature, is called
- ADry bulb depression
- BWet bulb depression
- CDew point depression
- DDegree of saturation
4.The difference between dry bulb temperature and wet bulb temperature, is called
- ADry bulb depression
- BWet bulb depression
- CDew point depression
- DDegree of saturation
5.The refrigerant for a refrigerator should have
- AHigh sensible heat
- BHigh total heat
- CHigh latent heat
- DLow latent heat
6.In a bootstrap air evaporative cooling system, the evaporator is provided
- ABetween the combustion chamber and the first heat exchanger
- BBetween the first heat exchanger and the secondary compressor
- CBetween the secondary compressor and the second heat exchanger
- DBetween the second heat exchanger and the cooling turbine
7.The evolution of heat of solution takes place in ammonia absorption plant when
- AAmmonia vapour goes into solution
- BAmmonia vapour is driven out of solution
- CLithium bromide mixes with ammonia
- DWeak solution mixes with strong solution
8.The alignment circle is marked on the psychrometric chart at
- A20°C DBT and 50% RH
- B26°C DBT and 50% RH
- C20°C DBT and 60% RH
- D26°C DBT and 60% RH
9.In a lithium bromide absorption refrigeration system
- ALithium bromide is used as a refrigerant and water as an absorbent
- BWater is used as a refrigerant and lithium bromide as an absorbent
- CAmmonia is used as a refrigerant and lithium bromide as an absorbent
- DNone of the above
10.Most of the domestic refrigerators work on the following refrigeration system
- AVapour compression
- BVapour absorption
- CCarnot cycle
- DElectrolux refrigerator
11.The condition of refrigerant after passing through the condenser in a vapour compression system is
- ASaturated liquid
- BWet vapour
- CDry saturated vapour
- DSuperheated vapour
12.During dehumidification process, _________ remains constant.
- AWet bulb temperature
- BRelative humidity
- CDry bulb temperature
- DSpecific humidity
13.During adiabatic saturation process on unsaturated air __________ remains constant.
- ARelative humidity
- BDew point temperature
- CDry bulb temperature
- DWet bulb temperature
14.One of the purposes of sub cooling the liquid refrigerant is to
- AReduce compressor overheating
- BReduce compressor discharge temperature
- CIncrease cooling effect
- DEnsure that only liquid and not the vapour enters the expansion (throttling) valve
15.The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will
- AIncrease
- BDecrease
- CMay increase or decrease depending on the type of refrigerant used
- DRemain unaffected
16.Rating of a domestic refrigerator is of the order of
- A0.1 Ton
- B5 Tons
- C10 tons
- D40 tons
17.Allowable pressure on high pressure side or ammonia absorption system is of the order of
- AAtmospheric pressure
- BSlightly above atmospheric pressure
- C24 bars
- D56 bars
18.Mass flow ratio of NH₃ in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of
- A1: 1
- B1: 9
- C9: 1
- D1:3
19.The capacity of a domestic refrigerator is in the range of
- A0.1 to 0.3 TR
- B1 to 3 TR
- C3 to 5 TR
- D5 to 7 TR
20.When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be
- APositive
- BNegative
- CZero
- DNone of these