Practice Test: Question Set - 01
1. In a refrigeration cycle, the flow of refrigerant is controlled by
- (A) Compressor
- (B) Condenser
- (C) Evaporator
- (D) Expansion valve
2. The colour of the flame of halide torch, in case of leakage of Freon refrigerant, will change to
- (A) Bright
green
- (B) Yellow
- (C) Red
- (D) Orange
3. For air conditioning the operation theater in a hospital, the percentage of outside air in the air supplied is
- (A) Zero
- (B) 20
- (C) 50
- (D) 100
4. In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at
- (A) Suction of compressor
- (B) Delivery of
compressor
- (C) High pressure side
close to receiver
- (D) Low pressure side
near receiver
5. The temperature of air recorded by a thermometer, when it is not affected by the moisture present in the air, is called
- (A) Wet
bulb temperature
- (B) Dry
bulb temperature
- (C) Dew
point temperature
- (D) None
of these
6. Absorption system normally uses the following refrigerant
- (A) Freon-11
- (B) Freon-22
- (C) CO2
- (D) Ammonia
7. Which of the following statement is correct?
- (A) In
vapour absorption refrigerator, the compression of refrigerant is avoided.
- (B) Sub-cooling
can be achieved by circulating more quantity of cooling water through the
condenser.
- (C) In vapour
compression refrigeration, the vapour is drawn in the compressor cylinder
during its suction stroke and is compressed adiabatically during the
compression stroke.
- (D) All of the
above
8. Allowable pressure on high pressure side or ammonia absorption system is of the order of
- (A) Atmospheric pressure
- (B) Slightly above
atmospheric pressure
- (C) 24 bars
- (D) 56 bars
9. The C.O.P. of a Carnot refrigerator in winter will be _________ as compared to C.O.P. in summer.
- (A) Same
- (B) Lower
- (C) Higher
- (D) None of
these
10. Chaperon equation is a relation between
- (A) Temperature, pressure
and enthalpy
- (B) Specific volume and
enthalpy
- (C) Temperature and
enthalpy
- (D) Temperature, pressure, specific volume and
enthalpy
11. During humidification process, __________ increases.
- (A) Wet
bulb temperature
- (B) Relative
humidity
- (C) Dry
bulb temperature
- (D) Specific
humidity
12. Where does the lowest temperature occur in a vapour compression cycle?
- (A) Condenser
- (B) Evaporator
- (C) Compressor
- (D) Expansion valve
13. The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called
- (A) Humidity
ratio
- (B) Relative
humidity
- (C) Absolute
humidity
- (D) Degree
of saturation
14. Under cooling in a refrigeration cycle
- (A) Increases C.O.P
- (B) Decreases C.O.P
- (C) C.O.P remains
unaltered
- (D) Other factors decide
C.O.P
15. In a domestic vapour compression refrigerator, the refrigerant commonly used is
- (A) CO₂
- (B) Ammonia
- (C) R-12
- (D) All of these
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