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Free download in PDF Refrigeration and Air Conditioning Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for competitive exams. These short solved questions or quizzes are provided by Gkseries.
(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
(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
(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
(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
(28)
Air refrigeration cycle is used in
[A]
domestic refrigerators
[B]
commercial refrigerators
[C]
air conditioning
[D]
gas liquefaction
(29)
Air refrigeration operates on
[A]
Carnot cycle
[B]
Reversed Carnot cycle
[C]
Rankine cycle
[D]
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
31
Refrigeration in aeroplanes usually employs the following refrigerant
[A]
Co2
[B]
Freon-11
[C]
Freon-22
[D]
Air
32
Presence of moisture in a refrigerant affects the working of
[A]
compressor
[B]
condenser
[C]
evaparator
[D]
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
35
Rating of a domestic refrigerator is of the order of
[A]
0.1 ton
[B]
5 tons
[C]
10 tons
[D]
40 tons
36
The refrigerant for a refrigerator should have
[A]
high sensible heat
[B]
high total heat
[C]
high latent heat
[D]
low 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
40
The moisture in a refrigerant is removed by
[A]
evaporator
[B]
safety relief valve
[C]
dehumidifier
[D]
driers
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