331. In chemical dehumidification process,
dew point temperature decreases
wet bulb temperature decreases
dry bulb temperature increases
all of these
✅ The correct answer is option D.
Heat Transfer, Refrigeration and Air Conditioning MCQs
332. Environmental protection agencies advice against the use of chloro-fluoro-carbon refrigerants since
these react with water vapour and cause acid rain
these react with plants and cause green-house effect
these react with oxygen and cause its depletion
these react with ozone
✅ The correct answer is option D.
333. The ratio of the energy absorbed by the body to the total energy falling on it, is called
absorptive power
emissive power
emissivity
none of these
✅ The correct answer is option A.
334. The evaporator changes the low pressure liquid refrigerant from the expansion valve into
high pressure liquid refrigerant
low pressure liquid and vapour refrigerant
low pressure vapour refrigerant
none of these
✅ The correct answer is option C.
335. A condenser is used in the __________ pressure side of a refrigerating system.
low
high
✅ The correct answer is option B.
336. If the condenser temperature is kept constant, the coefficient of performance of a refrigeration cycle increases with the increase in evaporator temperature.
Yes
No
✅ The correct answer is option A.
338. In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering air, then the air is
heated and dehumidified
heated and humidified
cooled and humidified
cooled and dehumidifie
✅ The correct answer is option B.
339. A boot-strap air cooling system has
one heat exchanger
two heat exchangers
three heat exchangers
four heat exchangers
✅ The correct answer is option B.
340. During sensible cooling of air, specific humidity
remains constant
increases
decreases
✅ The correct answer is option A.