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MCQs

Total Questions : 1342 | Page 3 of 135 pages
Question 21. In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be
  1.    High, of the order of 25°
  2.    As low as possible (3 to 11°C)
  3.    Zero
  4.    Any value
 Discuss Question
Answer: Option B. -> As low as possible (3 to 11°C)
Question 22. Air refrigeration cycle is used in
  1.    Domestic refrigerators
  2.    Commercial refrigerators
  3.    Air conditioning
  4.    Gas liquefaction
 Discuss Question
Answer: Option D. -> Gas liquefaction
Question 23. The value of C.O.P in vapour compression cycle is usually
  1.    Always less than unity
  2.    Always more than unity
  3.    Equal to unity
  4.    Any one of the above
 Discuss Question
Answer: Option B. -> Always more than unity
Question 24. The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is
  1.    Bigger
  2.    Smaller
  3.    Equal
  4.    Smaller/bigger depending on capacity
 Discuss Question
Answer: Option A. -> Bigger
Question 25. In a refrigeration system, heat absorbed in comparison to heat rejected is
  1.    More
  2.    Less
  3.    Same
  4.    More for small capacity and less for high capacity
 Discuss Question
Answer: Option B. -> Less
Question 26. In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
  1.    It considerably reduces mass of the system
  2.    It improves the C.O.P., as the condenser is small
  3.    The positive work in isentropic expansion of liquid is very small
  4.    It leads to significant cost reduction
 Discuss Question
Answer: Option C. -> The positive work in isentropic expansion of liquid is very small
Question 27. The optimum effective temperature for human comfort is
  1.    Higher in winter than in summer
  2.    Lower in winter than in summer
  3.    Same in winter and summer
  4.    Not dependent on season
 Discuss Question
Answer: Option B. -> Lower in winter than in summer
Question 28. In a refrigeration cycle, the flow of refrigerant is controlled by
  1.    Compressor
  2.    Condenser
  3.    Evaporator
  4.    Expansion valve
 Discuss Question
Answer: Option D. -> Expansion valve
Question 29. An evaporator is also known as
  1.    Freezing coil
  2.    Cooling coil
  3.    Chilling coil
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 30. Vapour compression refrigeration is somewhat like
  1.    Carnot cycle
  2.    Reversed Carnot cycle
  3.    None of the above
 Discuss Question
Answer: Option C. -> None of the above

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