271. Air conditioning means
cooling
heating
dehumidifying
all of these
✅ The correct answer is option D.
Heat Transfer, Refrigeration and Air Conditioning MCQs
272. The reduced ambient air cooling system has
one cooling turbine and one heat exchanger
one cooling turbine and two heat exchangers
two cooling turbines and one heat exchanger
two cooling turbines a
✅ The correct answer is option C.
273. The super-heating in a refrigeration cycle
does not alter C.O.P.
increases C.O.P.
decreases C.O.P.
none of these
✅ The correct answer is option C.
274. The difference between dry bulb temperature and dew point temperature, is called
dry bulb depression
wet bulb depression
dew point depression
degree of saturation
✅ The correct answer is option C.
275. In aircraft, air refrigeration Cycle is used because of
low weight per tonne of refrigeration
high heat transfer rate
low temperature at high altitudes
higher coefficient of
✅ The correct answer is option A.
276. The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as
Wien’s law
Stefan’s law
Kirchhoff’s law
Planck’s law
✅ The correct answer is option C.
277. The process, generally used in winter air-conditioning to warm and humidity the air, is called
humidification.
dehumidification
heating and humidification
cooling and dehumidifi
✅ The correct answer is option C.
278. The absolute humidity is the mass of water vapour present in 1 m3 of dry air.
Agree
Disagree
✅ The correct answer is option A.
279. If the evaporator temperature is kept constant, the coefficient of performance of a refrigeration cycle __________ with the increase in condenser temperature.
increases
decreases
✅ The correct answer is option B.
280. The critical thickness of insulation for a sphere is
k/h0
2k/h0
h0/k
h0/2k
✅ The correct answer is option B.