311. During cooling and dehumidification, dry bulb temperature
remains constant
increases
decreases
✅ The correct answer is option C.
Heat Transfer, Refrigeration and Air Conditioning MCQs
312. A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100° C and leaves at 60° C. A cold fluid enters the heat exchanger at 40° C. The mean temperature difference between the two fluids is
20°C
40°C
60°C
66.7°C
✅ The correct answer is option A.
313. The sensible heat gain is due to the __________ difference between the fresh air and the air in space.
temperature
humidity
✅ The correct answer is option A.
314. Thermal diffusivity of a substance is
directly proportional to the thermal conductivity
inversely proportional to density of substance
inversely proportional to specific heat
all of the above
✅ The correct answer is option D.
316. In a saturated air-water vapour mixture, the
dry bulb temperature is higher than wet bulb temperature
dew point temperature is lower than wet bulb temperature
dry bulb, wet bulb and dew point temperature are same
dry bulb temperature i
✅ The correct answer is option C.
317. The temperature below which a gas is always liquified, is known as critical temperature.
Correct
Incorrect
✅ The correct answer is option B.
319. The boiling point of carbon dioxide is
-20.5°C
-50°C
-63.3°C
-78.3°C
✅ The correct answer is option D.
320. During sensible heating of air __________ decreases.
wet bulb temperature
relative humidity
dry bulb temperature
specific humidity
✅ The correct answer is option B.