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MCQs

Total Questions : 1342 | Page 6 of 135 pages
Question 51. Highest pressure encountered in a refrigeration system should be
  1.    Critical pressure of refrigerant
  2.    Much below critical pressure
  3.    Much above critical pressure
  4.    Near critical pressure
 Discuss Question
Answer: Option B. -> Much below critical pressure
Question 52. The heat rejection factor (HRF) is given by
  1.    1 + C.O.P
  2.    1 - C.O.P.
  3.    1 + (1/C.O.P)
  4.    1 - (1/C.O.P)
 Discuss Question
Answer: Option C. -> 1 + (1/C.O.P)
Question 53. Which of the following cycles uses air as the refrigerant?
  1.    Ericson
  2.    Stirling
  3.    Carnot
  4.    Bell Coleman
 Discuss Question
Answer: Option D. -> Bell Coleman
Question 54. In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering air, then the air is
  1.    Heated and dehumidified
  2.    Heated and humidified
  3.    Cooled and humidified
  4.    Cooled and dehumidified
 Discuss Question
Answer: Option B. -> Heated and humidified
Question 55. In a refrigerating machine, heat rejected is _________ heat absorbed.
  1.    Equal to
  2.    Less than
  3.    Greater than
  4.    None of these
 Discuss Question
Answer: Option C. -> Greater than
Question 56. During sensible heating of air _________ decreases.
  1.    Wet bulb temperature
  2.    Relative humidity
  3.    Dry bulb temperature
  4.    Specific humidity
 Discuss Question
Answer: Option B. -> Relative humidity
Question 57. During humidification process, __________ increases.
  1.    Wet bulb temperature
  2.    Relative humidity
  3.    Dry bulb temperature
  4.    Specific humidity
 Discuss Question
Answer: Option B. -> Relative humidity
Question 58. Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system
  1.    Strong solution to weak solution
  2.    Weak solution to strong solution
  3.    Strong solution to ammonia vapour
  4.    Ammonia vapours to weak solution
 Discuss Question
Answer: Option B. -> Weak solution to strong solution
Question 59. The boiling point of ________ is 10.5°C.
  1.    Ammonia
  2.    R-12
  3.    Sulphur dioxide
  4.    Carbon dioxide
 Discuss Question
Answer: Option C. -> Sulphur dioxide
Question 60. An infinite parallel planes with emissivities e₁ and e₂, the interchange factor for radiation from surface 1 to surface 2 is given by
  1.    (e₁ + e₂)/ e₁ + e₂ - e₁e₂
  2.    1/e₁ + 1/e₂
  3.    e₁ + e₂
  4.    e₁e₂
 Discuss Question
Answer: Option A. -> (e₁ + e₂)/ e₁ + e₂ - e₁e₂

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