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Mechanical Engineering
1000 Refrigeration Air Conditioning
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Q.1
What is Refrigeration?
a) Refrigeration is the process of removing heat from a substance and cooling it to a temperature or below the actual temperature
b) Refrigeration is the process of adding heat from a substance and cooling it to a temperature
c) Refrigeration is used to increase the level of humidity in the air by adding heat
d) None of the mentioned
Q.2
How is the refrigerant used in the Air refrigeration cycle?
a) In the compressor
b) In the condenser
c) Directly in contact
d) Not used at all
Q.3
Which of the following refers to the term C.O.P. of refrigeration?
a) Cooling for Performance
b) Coefficient of Performance
c) Capacity of Performance
d) Co-efficient of Plant
Q.4
Which of the following is NOT the advantages of using a closed Air Refrigeration system?
a) Compact in construction
b) Lower coefficient of performance
c) Lighter in weight
d) Environmental Friendly
Q.5
In lithium bromide absorption refrigeration system it is not necessary to keep the refrigeration temperature above 0°C.
a) False
b) True
Q.6
Which of the following is the S.I. unit to measure pressure in refrigeration?
a) Bar
b) Newton
c) Joule
d) Pascal
Q.7
Which of the following is the main disadvantage of natural refrigeration methods?
a) natural refrigeration methods are dependent on local conditions
b) natural refrigeration methods are not environment friendly
c) natural refrigeration methods are expensive
d) natural refrigeration methods are poisonous
Q.8
Which of the following is the result of a reduction in operating pressure in the Air refrigeration cycle?
a) decrease in C.O.P.
b) always decreases
c) increase in C.O.P.
d) no change in C.O.P.
Q.9
Which of the following is the key difference between a simple VAR and Electrolux refrigerator?
a) Working mechanism
b) Generator
c) Absorber
d) Liquid pump
Q.10
Efficiency of the Refrigerator is _________ to the C.O.P of the refrigerator.
a) independent
b) directly proportional
c) inversely proportional
d) equal
Q.11
Which of the following will be the value of Refrigeration effect if m2 = 2 kg/min, m3 = 0.8 kg/min and enthalpies for the refrigerant at saturated vapor and saturated liquid line areandkJ/kg?
a) 129
b) 196
c) 194
d) 192
Q.12
Which of the following of the refrigerant is used as a refrigerant in Lithium Bromide Absorption Refrigeration system?
a) Lithium Bromide
b) Hydrogen
c) Water
d) Ammonia
Q.13
Which of the following refrigerants are used in Electrolux and Li-Br water refrigeration system?
a) Water and Bromide
b) Ammonia and Water
c) Ammonia and Lithium
d) Water and Water
Q.14
Which of the following will be the value of Refrigeration effect if m1 = 4 kg/min, and enthalpies for the point9 areandkJ/kg. If the refrigeration effect iskJ/min and work done iskW, then what is the value of C.O.P.?
a) 4.75
b) 6.00
c) 5.50
d) 4.85
Q.15
Which of the following is the common application of Air standard refrigeration system?
a) Cold storage
b) Car air conditioning system
c) Domestic refrigerators
d) Aircraft air conditioning
Q.16
What is Air Conditioning?
a) Air Conditioning is the process of adding heat and increasing the humidity
b) Air Conditioning is the process of removing heat and controlling the humidity of air in a closed space
c) Air conditioning is the process of controlling air moisture in an open area by adding heat
d) None of the mentioned
Q.17
Which of the following process is used in winter air conditioning?
a) Cooling and Dehumidification
b) Heating and Humidification
c) Dehumidification
d) Humidification
Q.18
On which of the following cycle the air conditioning systems are based in transport aviation?
a) Reversed Joule’s cycle
b) Otto cycle
c) Reversed Carnot cycle
d) Reversed Brayton cycle
Q.19
Which of the following process is used in summer air conditioning?
a) Heating and Humidification
b) Cooling and Dehumidification
c) Humidification
d) Dehumidification
Q.20
If the Coefficient of performance of a heat pump isthen what is the value of the Coefficient of performance of the refrigerator operating under the same conditions?
a) 0.2
b) 3
c) 4
d) 6
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