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MCQs

Total Questions : 1342 | Page 2 of 135 pages
Question 11. The desirable property of a refrigerant is
  1.    Low boiling point
  2.    High critical temperature
  3.    High latent heat of vaporisation
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 12. The operating pressure for refrigerating units using R-12 as a refrigerant is
  1.    2 bar
  2.    8 bar
  3.    15 bar
  4.    30 bar
 Discuss Question
Answer: Option B. -> 8 bar
Question 13. Cooling water is required for following equipment in ammonia absorption plant
  1.    Condenser
  2.    Evaporator
  3.    Absorber
  4.    Condenser, absorber and separator (rectifier)
 Discuss Question
Answer: Option D. -> Condenser, absorber and separator (rectifier)
Question 14. The coefficient of performance of a domestic refrigerator is ________ as compared to a domestic air-conditioner.
  1.    Same
  2.    Less
  3.    More
  4.    None of these
 Discuss Question
Answer: Option B. -> Less
Question 15. In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature
  1.    Which lies between the dry bulb and wet bulb temperatures of the incoming stream
  2.    Which lies between the wet bulb and dew point temperatures of the incoming stream
  3.    Which is lower than the dew point temperature of the incoming stream
  4.    Of adiabatic saturation of incoming stream
 Discuss Question
Answer: Option C. -> Which is lower than the dew point temperature of the incoming stream
Question 16. In aqua ammonia and Lithium bromide water absorption refrigeration systems, the refrigerants are respectively
  1.    Water and water
  2.    Water and lithium bromide
  3.    Ammonia and lithium bromide
  4.    Ammonia and water
 Discuss Question
Answer: Option D. -> Ammonia and water
Question 17. During heating and dehumidification process, dry bulb temperature
  1.    Remains constant
  2.    Increases
  3.    Decreases
  4.    None of these
 Discuss Question
Answer: Option B. -> Increases
Question 18. During cooling and dehumidification, dry bulb temperature
  1.    Remains constant
  2.    Increases
  3.    Decreases
  4.    None of these
 Discuss Question
Answer: Option C. -> Decreases
Question 19. In a domestic vapour compression refrigerator, the refrigerant commonly used is
  1.    CO?
  2.    Ammonia
  3.    R-12
  4.    All of these
 Discuss Question
Answer: Option C. -> R-12
Question 20. The minimum temperature to which water can be cooled in a cooling tower is
  1.    Dew point temperature of air
  2.    Wet bulb temperature of air
  3.    Dry bulb temperature of air
  4.    Ambient air temperature
 Discuss Question
Answer: Option B. -> Wet bulb temperature of air

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