260 Important Refrigeration And Air Conditioning MCQ Question and Answer | PDF Free Download
1.Air refrigeration operates on
- ACarnot cycle
- BReversed Carnot cycle
- CRankine’s cycle
- DBrayton cycle
2.In aqua ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in
- ACondenser
- BEvaporator
- CAbsorber
- DNone of these
3.While designing the refrigeration system of an aircraft, the prime consideration is that the
- ASystem has high C.O.P.
- Bv
- CMass of refrigerant circulated in the system is low
- DMass of the refrigeration equipment is low
4.In a pressure enthalpy chart, the space to the left of the saturated liquid line represents
- AWet vapour region
- BSuperheated vapour region
- CSub-cooled liquid region
- DNone of these
5.Critical pressure of a liquid is the pressure
- AAbove which liquid will remain liquid
- BAbove which liquid becomes gas
- CAbove which liquid becomes vapour
- DAbove which liquid becomes solid
6.The C.O.P. of a heat pump working on a reversed Carnot cycle is
- AT₁/(T₂ - T₁)
- B(T₂ - T₁)/T₁
- C(T₁ - T₂)/T₁
- DT₂/(T₂ - T₁)
7.For better C.O.P of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be
- ASmall
- BHigh
- CEqual
- DAnything
8.As relative humidity decreases, the dew point temperature will be ________ wet bulb temperature.
- ASame as
- BLower than
- CHigher than
- DNone of these
9.For unsaturated air, the dew point temperature is __________ wet bulb temperature.
- AEqual to
- BLess than
- CMore than
- DNone of these
10.An Electrolux refrigerator is called a _________ absorption system.
- ASingle fluid
- BTwo fluids
- CThree fluids
- DNone of these
11.The mass of water vapour present in __________ is called absolute humidity.
- A1 m3 of water
- B1 m3 of dry air
- C1 kg of wet air
- D1 kg of dry air
12.The index which correlates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as
- AMean radiant temperature
- BEffective temperature
- CDew point temperature
- DNone of these
13.The atmospheric air at dry bulb temperature of 15°C enters a heating coil maintained at 40°C. The air leaves the heating coil at 25°C. The bypass factor of the heating coil is
- A0.376
- B0.4
- C0.6
- D0.67
14.The vapour compression refrigerator employs the following cycle
- ARankine
- BCarnot
- CReversed Rankine
- DReversed Carnot
15.For air conditioning the operation theater in a hospital, the percentage of outside air in the air supplied is
- AZero
- B20
- C50
- D100
16.The central air conditioning system has ___________ overall efficiency as compared to individual systems.
- ASame
- BLower
- CHigher
- DNone of these
17.The lowest thermal diffusivity is of
- AIron
- BLead
- CAluminium
- DRubber
18.The vertical and uniformly spaced lines on a psychrometric chart indicates
- ADry bulb temperature
- BWet bulb temperature
- CDew point temperature
- DSpecific humidity
19.The horizontal and non-uniformly spaced lines on a psychrometric chart indicates
- ADry bulb temperature
- BWet bulb temperature
- CDew point temperature
- DSpecific humidity
20.The curved lines on a psychrometric chart indicates
- ADry bulb temperature
- BWet bulb temperature
- CDew point temperature
- DRelative humidity