Refrigeration and Air Conditioning Quiz | Refrigeration and Air Conditioning Objective Type Questions and Answers

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

Answer: more than or equal to 3.65 kg
22 Highest temperature encountered in refrigeration cycle should be
A near critical temperature of refrigerant
B above critical temperature
C at critica. temperature
D much below critical temperature

Answer: much below critical temperature
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23 The higher temperature in vapour compression cycle occurs at
A receiver
B expansion valve
C evaporator
D compressor discharge

Answer: compressor discharge
24 The bank of tubes at the back of domestic refrigerator are
A condenser tubes
B evaporator tubes
C refrigerant cooling tubes
D capillary tubes

Answer: condenser tubes
25 For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be
A small
B high
C euqal
D anything

Answer: small
26 The vapour pressure of refrigerant should be
A lower than atmospheric pressure
B higher than atmospheric pressure
C equal to atmospheric pressure
D could be anything

Answer: higher than atmospheric pressure
27 In a vapour compression cycle, the refrigerant immediately after expansion valve is
A liquid
B sub-cooled liquid
C saturated liquid
D wet vapour

Answer: wet vapour
28 Air refrigeration cycle is used in
A domestic refrigerators
B commercial refrigerators
C air conditioning
D gas liquefaction

Answer: gas liquefaction
29 Air refrigeration operates on
A Carnot cycle
B Reversed Carnot cycle
C Rankine cycle
D Brayton cycle

Answer: Brayton cycle
30 Domestic refrigerator working on vapour compression cycle uses the following type of expansion device
A electrically operated throttling valve
B manually operated valve
C thermostatic valve
D capillary tube

Answer: capillary tube
31 Refrigeration in aeroplanes usually employs the following refrigerant
A Co2
B Freon-11
C Freon-22
D Air

Answer: Air
32 Presence of moisture in a refrigerant affects the working of
A compressor
B condenser
C evaparator
D expansion valve

Answer: expansion valve
33 The domestic refrigerator uses following type of compressor
A centrifugal
B axial
C miniature sealed unit
D piston type reciprocating

Answer: piston type reciprocating
34 The COP of a domestic refrigerator
A is less than 1
B is more than 1
C is equal to 1
D depends upon the make

Answer: is more than 1
35 Rating of a domestic refrigerator is of the order of
A 0.1 ton
B 5 tons
C 10 tons
D 40 tons

Answer: 0.1 ton
36 The refrigerant for a refrigerator should have
A high sensible heat
B high total heat
C high latent heat
D low latent heat

Answer: high latent heat
37 Critical temperature is' the temperature above which
A a gas will never liquefy
B a gas will immediately liquefy
C water will evaporate
D water will never evaporate

Answer: a gas will never liquefy
38 Critical pressure of a liquid is the pressure
A above which liquid will remain liquid
B above which liquid becomes gas
C above which liquid becomes vapour
D at which all the three phases exist together

Answer: above which liquid will remain liquid
39 The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,
A will be higher
B will be lower
C will remain unaffected
D may be higher or lower depending upon the nature of non-condensable gases

Answer: will be higher
40 The moisture in a refrigerant is removed by
A evaporator
B safety relief valve
C dehumidifier
D driers

Answer: driers

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