341. The horizontal and uniformly spaced lines on a psychrometric chart indicates relative humidity.
Correct
Incorrect
✅ The correct answer is option B.
Heat Transfer, Refrigeration and Air Conditioning MCQs
342. A good refrigerant should have
high latent heat of vaporisation and low freezing point
high operating pressures and low freezing point
high specific volume and high latent heat of vaporisation
low C.O.P. and low fre
✅ The correct answer is option A.
343. Film coefficient is defined as the ratio of
thermal conductivity to the equivalent thickness of the film of fluid
temperature drop through the films of fluids to the thickness of film of fluids
thickness of film of fluid to the thermal conductivity
thickness of film of f
✅ The correct answer is option A.
344. The thermostatic expansion valve operates on the changes in the
degree of superheat at exit from the evaporator
temperature of the evaporator
pressure in the evaporator
none of the above
✅ The correct answer is option A.
345. The dry bulb temperature during sensible heating of air
remains constant
increases
decreases
✅ The correct answer is option B.
346. A grey body is one whose absorptivity does not vary with temperature and wave length of the incident ray.
TRUE
FALSE
✅ The correct answer is option A.
347. The refrigerant widely used in domestic refrigerators is
ammonia
carbon dioxide
sulphur dioxide
R-12
✅ The correct answer is option D.
348. An ordinary passenger aircraft requires a cooling system of capacity.
2 TR
4 TR
8 TR
10 TR
✅ The correct answer is option C.
350. Most air cooled condensers are designed to operate with a temperature difference of
5°C
8°C
14°C
22°C
✅ The correct answer is option C.