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MCQs

Total Questions : 1342 | Page 133 of 135 pages
Question 1321. The lowest temperature during the cycle in a vapour compression system occurs after
  1.    Evaporation
  2.    Compression
  3.    Expansion
  4.    Condensation
 Discuss Question
Answer: Option A. -> Evaporation
Question 1322. Which of the following refrigerant has the maximum ozone depletion potential in the stratosphere?
  1.    Ammonia
  2.    Fluorine
  3.    Carbon dioxide
  4.    Sulphur dioxide
 Discuss Question
Answer: Option B. -> Fluorine
Question 1323. Which of the following refrigerants has lowest freezing point?
  1.    CO2
  2.    Freon-22
  3.    NH3
  4.    Freon-12
 Discuss Question
Answer: Option B. -> Freon-22
Question 1324. Accumulators should have adequate volume to store refrigerant charge at least
  1.    0.1
  2.    0.25
  3.    0.75
  4.    0.5
 Discuss Question
Answer: Option D. -> 0.5
Question 1325. Short horizontal lines on pressure-enthalpy chart show
  1.    Constant entropy lines
  2.    Constant total heat lines
  3.    Constant pressure lines
  4.    Constant temperature lines
 Discuss Question
Answer: Option C. -> Constant pressure lines
Question 1326. Presence of moisture in a refrigerant affects the working of
  1.    Compressor
  2.    Evaporator
  3.    Expansion valve
  4.    Condenser
 Discuss Question
Answer: Option C. -> Expansion valve
Question 1327. The humidity ratio or specific humidity is the mass of water vapour present in
  1.    1 m3 of wet air
  2.    1 kg of wet air
  3.    1 kg of dry air
  4.    1 m3 of dry air
 Discuss Question
Answer: Option C. -> 1 kg of dry air
Question 1328. Wet bulb temperature is the temperature of air recorded by a thermometer, when
  1.    Its bulb is surrounded by a wet cloth exposed to the air
  2.    It is not affected by the moisture present in the air
  3.    None of these
  4.    The moisture present in it begins to condense
 Discuss Question
Answer: Option A. -> Its bulb is surrounded by a wet cloth exposed to the air
Question 1329. In vapour compression cycle the condition of refrigerant is superheated vapour
  1.    After passing through the expansion or throttle valve
  2.    After passing through the condenser
  3.    Before passing through the condenser
  4.    Before entering the expansion valve
 Discuss Question
Answer: Option C. -> Before passing through the condenser
Question 1330. The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and
  1.    Sulphur dioxide
  2.    Carbon dioxide
  3.    Lithium bromide
  4.    R-12
 Discuss Question
Answer: Option C. -> Lithium bromide

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