✅ The correct answer is option B.
Heat Transfer
The heat rejection factor (HRF) is given by
1 + C.O.P
1 – C.O.P.
✅ The correct answer is option C.
Dew point temperature corresponds to the saturation temperature of vapour at its partial pressure.
TRUE
FALSE
✅ The correct answer is option A.
The natural convection air cooled condensers are used in
domestic refrigerators
water coolers
room air conditioners
all of these
✅ The correct answer is option A.
The C.O.P. of a heat pump working on a reversed Carnot cycle is
✅ The correct answer is option D.
The boiling point of __________ is -10.5°C.
ammonia
R-12
sulphur dioxide
carbon dioxide
✅ The correct answer is option C.
The wet bulb temperature during sensible cooling of air
remains constant
increases
decreases
✅ The correct answer is option C.
A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in higher coefficient of performance.
Agree
Disagree
✅ The correct answer is option A.
In a reversed Brayton cycle, the heat is absorbed by the air during
isentropic compression process
constant pressure cooling process
isentropic expansion process
constant pressure expa
✅ The correct answer is option D.
The logarithmic mean temperature difference ™ is given by (where Δt1 and Δt2 are temperature differences between the hot and cold fluids at entrance and exit)
tm = (Δt1 – Δt1) loge(Δt1/Δt1)
✅ The correct answer is option A.