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
0 h : 0 m : 1 s