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Refrigeration and Air Conditioning Quiz | Refrigeration and Air Conditioning Short Questions and Answers

Questions
41 Which of the following is not a desirable property of a refrigerant
A high triiscibility with oil
B low boiling point
C good electrical conductor
D large latent heat

Answer: good electrical conductor
42 A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. The Cannot coefficient of performance of cycle will be
A 0.2
B 1.2
C 5
D 6

Answer: 5
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43 At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant
A decreases
B increases
C remains same
D depends on other factors

Answer: increases
44 Accumulators should have adequate volume to store refrigerant charge at least
A 10%
B 25%
C 50%
D 75%

Answer: 50%
45 In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to
A collect liquid refrigerant and prevent it from going to compressor
B detect liquid in vapour
C collect vapours
D superheat the vapour

Answer: collect liquid refrigerant and prevent it from going to compressor
46 In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be
A high, of the order of 25°
B as low as possible (3 to 11°C)
C zero
D any value

Answer: as low as possible (3 to 11°C)
47 Formation of frost on evaporator in refrigerator
A results in loss of heat due to poor heat transfer
B increases heat transfer rate
C is immaterial
D can be avoided by proper design

Answer: results in loss of heat due to poor heat transfer
48 Condensing temperature in a refrigerator is the temperature
A of cooling medium
B of freezing zone
C of evaporator
D at which refrigerant gas becomes liquid

Answer: at which refrigerant gas becomes liquid
49 In a refrigeration system, heat absorbed in comparison to heat rejected is
A more
B less
C same
D more for small capacity and less for high capacity

Answer: less
50 The value of COP in vapour compression cycle is usually
A always less than unity
B always more than unity
C equal to unity
D any one of the above

Answer: always more than unity
51 One of the purposes of sub-cooling the liquid refrigerant is to
A reduce compressor overheating
B reduce compressor discharge temperature
C increase cooling effect
D ensure that only liquid and not the vapour enters the expansion (throttling) valve

Answer: ensure that only liquid and not the vapour enters the expansion (throttling) valve
52 Absorption system normally uses the following refrigerant
A Freon-11
B ammonia
C Freon-22
D C02

Answer: ammonia
53 An important characteristic of absorption system of refrigeration is
A Noisy operation
B Quiet operation
C Cooling below 0°C
D Very little power consumption

Answer: Quiet operation
54 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
55 The fluids used in Electrolux refrigerator are
A Water and hydrogen
B Ammonia and hydrogen
C Ammonia, water and hydrogen
D None of these

Answer: Ammonia, water and hydrogen
56 The COP of a vapour compression plant in comparison to vapour absorption plant is
A More
B Less
C Same
D More/less depending on size of plant

Answer: More
57 In a lithium bromide absorption refrigeration system
A Lithium bromide is used as a refrigerant and water as an absorbent
B Water is used as a refrigerant and lithium bromide as an absorbent
C Ammonia is used as a refrigerant and lithium bromide as an absorbent
D None of these

Answer: Water is used as a refrigerant and lithium bromide as an absorbent
58 The bank of tubes at the back of domestic refrigerator is
A Condenser tubes
B Evaporator tubes
C Refrigerant cooling tubes
D Capillary tubes

Answer: Condenser tubes
59 The vapour compression refrigerator employs the following cycle
A Rankine
B Carnot
C Reversed Rankine
D Reversed Carnot

Answer: Reversed Carnot
60 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

Answer: Receiver and evaporator

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