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MCQs

Total Questions : 1342 | Page 130 of 135 pages
Question 1291. The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,
  1.    Will be higher
  2.    May be higher or lower depending upon the nature of non-condensable gases
  3.    Will remain unaffected
  4.    Will be lower
 Discuss Question
Answer: Option A. -> Will be higher
Question 1292. Air conditioning means
  1.    Heating
  2.    All of these
  3.    Cooling
  4.    Dehumidifying
 Discuss Question
Answer: Option B. -> All of these
Question 1293. In a psychrometric chart, specific humidity (moisture content) lines are
  1.    Horizontal and non-uniformly spaced
  2.    Horizontal and uniformly spaced
  3.    Vertical and uniformly spaced
  4.    Curved lines
 Discuss Question
Answer: Option B. -> Horizontal and uniformly spaced
Question 1294. The reduced ambient air cooling system has
  1.    Two cooling turbines and two heat exchangers
  2.    One cooling turbine and one heat exchanger
  3.    Two cooling turbines and one heat exchanger
  4.    One cooling turbine and two heat exchangers
 Discuss Question
Answer: Option C. -> Two cooling turbines and one heat exchanger
Question 1295. A bootstrap air cooling system has
  1.    Four heat exchangers
  2.    Two heat exchangers
  3.    Three heat exchangers
  4.    One heat exchanger
 Discuss Question
Answer: Option B. -> Two heat exchangers
Question 1296. Refrigeration in aeroplanes usually employs the following refrigerant
  1.    Freon-11
  2.    Air
  3.    Freon-22
  4.    CO2
 Discuss Question
Answer: Option B. -> Air
Question 1297. One tonne of refrigeration (1TR) means that the heat removing capacity is
  1.    21 kJ/min
  2.    210 kJ/min
  3.    620 kJ/min
  4.    420 kJ/min
 Discuss Question
Answer: Option B. -> 210 kJ/min
Question 1298. Most thermostatic expansion valves are set for a superheat of
  1.    15°C
  2.    5°C
  3.    20°C
  4.    10°C
 Discuss Question
Answer: Option B. -> 5°C
Question 1299. The bypass factor for a cooling coil
  1.    Decreases with increase in velocity of air passing through it
  2.    May increase or decrease with increase in velocity of air passing through it depending upon the condition of air entering
  3.    Remains unchanged with increase in velocity of air passing through it
  4.    Increases with increase in velocity of air passing through it
 Discuss Question
Answer: Option D. -> Increases with increase in velocity of air passing through it
Question 1300. For large tonnage (more than 200 TR) air-conditioning applications, the compressor recommended is
  1.    Screw
  2.    Rotating
  3.    Reciprocating
  4.    Centrifugal
 Discuss Question
Answer: Option D. -> Centrifugal

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