Quiz Refregiration and air Conditioning Online Practice Test1

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Test your caliber

1. The moisture in a refrigerant is removed by ____.
evaporator	safety relief valve
dehumidifier	driers

2. The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,
will be higher	will be lower
will remain unaffected	may be higher or lower depending upon the nature of non-condensable gases

3. Critical pressure of a liquid is the pressure
above which liquid will remain liquid	above which liquid becomes gas
above which liquid becomes vapour	above which liquid becomes solid

4. Critical temperature is' the temperature above which
a gas will never liquefy	a gas will immediately liquefy
water will evaporate	water will never evaporate

5. The refrigerant for a refrigerator should have
high sensible heat	high total heat
high latent heat	low latent heat

6. Rating of a domestic refrigerator is of the order of
0.1 ton	5 tons
10 tons	40 tons

7. The COP of a domestic refrigerator
is less than 1	is more than 1
is equal to 1	depends upon the make

8. The domestic refrigerator uses following type of compressor
centrifugal	axial
miniature sealed unit	piston type reciprocating

9. Presence of moisture in a refrigerant affects the working of _____.
compressor	condenser
evaparator	expansion valve

10. Refrigeration in aeroplanes usually employs the following refrigerant
C02	Freon-11
Freon-22	Air

11. Domestic refrigerator working on vapour compression cycle uses the following type of expansion device
electrically operated throttling valve	manually operated valve
thermostatic valve	capillary tube

12. Air refrigeration operates on ____.
Carnot cycle	Reversed Carnot cycle
Rankine cycle	Brayton cycle

13. Air refrigeration cycle is used in
domestic refrigerators	commercial refrigerators
air conditioning	gas liquefaction

14. In a vapour compression cycle, the refrigerant immediately after expansion valve is _____.
liquid	sub-cooled liquid
saturated liquid	wet vapour

15. The vapour pressure of refrigerant should be ______.
lower than atmospheric pressure	higher than atmospheric pressure
equal to atmospheric pressure	could be anything

16. For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be
small	high
euqal	anything

17. The bank of tubes at the back of domestic refrigerator are
condenser tubes	evaporator tubes
refrigerant cooling tubes	capillary tubes

18. The higher temperature in vapour compression cycle occurs at _____.
receiver	expansion valve
evaporator	compressor discharge

19. Highest temperature encountered in refrigeration cycle should be _____.
near critical temperature of refrigerant	above critical temperature
at critical temperature	much below critical temperature

20. In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is
less than 2 kg	more than or equal to 3.65 kg
more than 10 kg	there is no such consideration