zero
20
50
100
✅ The correct answer is option D.
Heat Transfer
For unsaturated air, the dew point temperature is __________ wet bulb temperature.
equal to
less than
more than
✅ The correct answer is option B.
Sulphur dioxide is extremely toxic and non-flammable.
TRUE
FALSE
✅ The correct answer is option A.
The thermal diffusivity for gases is generally __________ those for liquids.
equal to
less than
greater than
✅ The correct answer is option C.
The leakage in a refrigeration system using freon is detected by
halide torch
sulphur sticks
soap and water
all of these
✅ The correct answer is option A.
The value of the wave length for maximum emissive power is given by
Kirchhoff’s law
Stefan’s law
Wein’s law
Planck’s law
✅ The correct answer is option C.
If a gas is to be liquified, its temperature must be
increased to a value above its critical temperature
reduced to a value below its critical temperature
equal to critical temperature
none of the above
✅ The correct answer is option C.
During sensible heating of air, specific humidity remains constant.
Agree
Disagree
✅ The correct answer is option A.
In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = By-pass factor)
B.P.F. – 1
1 – B.P.F.
1 + B.RF.
✅ The correct answer is option B.
In figure shown, E is a heat engine with efficiency of 0.4 and R is a refrigerator. It is given that Q2 + Q4 = 3Q1. The C.O.P. of the refrigerator is
2.5
3
4
5
✅ The correct answer is option D.