381. The coefficient of performance of Heat Pump is always __________ one.
[A]. equal to
[B]. less than
[C]. greater than
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✅ The correct answer is option C.
Heat Transfer, Refrigeration and Air Conditioning MCQs
382. The heat transfer by conduction through a thick sphere is same as through a thick cylinder.
[A]. True
[B]. False
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null
✅ The correct answer is option B.
383. Which of the following represents a heat pump?
[A].
[B].
[C].
[D].
✅ The correct answer is option B.
384. The total radiation from a black body per second per unit area is __________ fourth power of the absolute temperature. This statement is known as Stefan-Boltzmann law.
[A]. equal to
[B]. directly proportional to
[C]. inversely proportional to
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✅ The correct answer is option B.
385. The difference between dry bulb temperature and wet bulb temperature, is called
[A]. dry bulb depression
[B]. wet bulb depression
[C]. dew point depression
[D]. degree of saturation
✅ The correct answer is option B.
386. For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of
[A]. copper
[B]. aluminium
[C]. steel
[D]. brass
✅ The correct answer is option C.
387. The by-pass factor for a cooling coil
[A]. increases with increase in velocity of air passing through it
[B]. decreases with increase in velocity of air passing through it
[C]. remains unchanged with increase in velocity of air passing through it
[D]. may increase or decrease with increase in velocity of air passing through it depending upon the condition of air entering
✅ The correct answer is option A.
388. As relative humidity decreases, the dew point temperature will be __________ wet bulb temperature.
[A]. same as
[B]. lower than
[C]. higher man
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✅ The correct answer is option B.
389. During a refrigeration cycle, heat is rejected by the refrigerant in a
[A]. compressor
[B]. condenser
[C]. evaporator
[D]. expansion valve
✅ The correct answer is option B.
390. The process of heat transfer from a hot body to a cold body, in a straight line, without affecting the intervening medium, is called radiation.
[A]. True
[B]. False
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✅ The correct answer is option A.