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WorksheetsBME-Ch-10-Refrigeration
Total questions: 30
Worksheet time: 30mins
Name
Class
Date
1.
In mechanical refrigeration system, the refrigerant has the maximum temperature
a)
in evaporator
b)
before expansion valve
c)
between compressor and condenser
d)
between condenser and evaporator
2.
A refrigerant with the highest critical pressure is
a)
R-11
b)
R-12
c)
R-22
d)
Ammonia
3.
In aqua-ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in
a)
condenser
b)
evaporator
c)
absorber
d)
none of these
4.
The central air conditioning system has __________ overall efficiency as compared to individual systems.
a)
same
b)
lower
c)
higher
d)
None of these
5.
Moisture should be removed from refrigerants to avoid
a)
freezing at the expansion valve
b)
restriction to refrigerant flow
c)
corrosion of steel plates
d)
all of these
6.
One tonne refrigareting machine means.......
a)
One tonne is the total mass of the machine
b)
One tonne of refrigerant is used
c)
One tonne of water can be converted into ice
d)
One tonne of ice when melts from at 00C in 24 hours,the refrigeration effect produced is equivalent to 210 kJ/min
7.
During a refrigeration cycle,heat is rejected by the refrigerant in a.......
a)
Condenser
b)
Compressure
c)
Evaporator
d)
Expansion valve
8.
The conditioned air supplied to the room must have the capacity to take up.......
a)
Room sensible heat load only
b)
Room latent heat load only
c)
Both B and C
d)
None of these
9.
The refrigeran,commonly used in vapour absorption refrigeration systems,is.......
a)
Sulphur dioxide
b)
Ammonia
c)
Freon
d)
Aqua-ammonia
10.
The boiling point of ammonia is
a)
-10.50C
b)
-30.50C
c)
-33.30C
d)
-77.60C
11.
Which of the following refrigerant has the lowest boiling point?.......
a)
Ammonia
b)
Carbon dioxide
c)
Sulphur dioxide
d)
Freon-12
12.
Which of the following refrigerant is highly toxic and flammable.......
a)
Ammonia
b)
Carbon dioxide
c)
Sulphur dioxide
d)
Freon-12
13.
Freon group of refrigerants are
a)
Inflammable
b)
Toxic
c)
Non-inflammable and toxic
d)
Nontoxic and non-inflammable
14.
In a refrigeration system, the expansion device is connected between the
a)
Compressor and condenser
b)
Condenser and receiver
c)
Receiver and evaporator
d)
Evaporator and compressor
15.
A human body feels comfortable when the heat produced by the metabolism of human body is equal to the
a)
Heat dissipated to the surroundings
b)
Heat stored in the human body
c)
Difference of (A) and (B)
d)
Sum of (A) and (B)
16.
The bank of tubes at the back of domestic refrigerator is
a)
Condenser tubes
b)
Evaporator tubes
c)
Refrigerant cooling tubes
d)
Capillary tubes
17.
Refrigerant used in domestic refrigerators is generally
a)
R134a
b)
carbon dioxide
c)
oxygen
d)
ammonia
18.
In VCR cycle, refrigeration effect is produced by
a)
compressor
b)
condenser
c)
expander
d)
evaporator
19.
Heat is absorbed by refrigerant during refrigeration cycle in
a)
Condenser
b)
Evaporator
c)
Capillary
d)
None of the above
20.
One ton of refrigeration is equal to
a)
421 kJ/min
b)
520 kJ/min
c)
120 kJ/min
d)
220 kJ/min
21.
The chemical formula of R-12 is
a)
CCl2F
b)
CClF3
c)
CHClF2
d)
CCl2F2
22.
Which of the following refrigerant is highly toxic and flammable?
a)
Ammonia
b)
Carbon dioxide
c)
Sulphur dioxide
d)
R-12
23.
An evaporator is also known as
a)
freezing coil
b)
cooling coil
c)
chilling coil
d)
all of these
24.
In larger industrial and commercial reciprocating compression systems, refrigerent widely used is
a)
ammonia
b)
carbon dioxide
c)
sulphur dioxide
d)
R-12
25.
The coefficient of performance of a domestic refrigerator is __________ as compared to a domestic air-conditioner.
a)
same
b)
less
c)
more
d)
None of these
26.
In order to collect liquid refrigerant and to prevent it from going to a __________ , a device known as accumulator is used at the suction of compressor.
a)
compressor
b)
condenser
c)
expansion valve
d)
evaporator
27.
The undesireable property of a refrigerant is
a)
non-toxic
b)
non-flammable
c)
non-explosive
d)
high boiling point
28.
The capillary tube, as an expansion device, is used in
a)
domestic refrigerators
b)
water coolers
c)
room air conditioners
d)
all of these
29.
A refrigerant compressor is used to
a)
raise the pressure of the refrigerant
b)
raise the temperature of the refrigerant
c)
circulate the refrigerant through the refrigerating system
d)
all of the above
30.
In which of the following refrigeration system, waste heat can be effectively used?
a)
Vapour compression cycle
b)
Vapour absorption cycle
c)
A AND B
d)
none of these
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