Correct
Incorrect
✅ The correct answer is option A.
Heat Transfer
The by-pass factor of a cooling coil decreases with
decrease in fin spacing and increase in number of rows
increase in fin spacing and increase in number of rows
increase in fin spacing and decrease in number of rows
decrease in fin spacin
✅ The correct answer is option A.
In a vapour compression system, the condition of refrigerant before passing through the condenser is
saturated liquid
wet vapour
dry saturated vapour
superheated vapour
✅ The correct answer is option D.
The thermal diffusivity for solids is generally less than those for liquids and gases.
TRUE
FALSE
✅ The correct answer is option B.
One tonne of refrigeration (1TR) means that the heat removing capacity is
21 kJ/min
210 kJ/min
420 kJ/min
620 kJ/min
✅ The correct answer is option B.
The ratio of actual heat transfer to the maximum possible heat transfer is known as heat exchanger effectiveness.
Agree
Disagree
✅ The correct answer is option A.
When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmittivity (τ) = 0, then the body is said to be a
black body
grey body
opaque body
white body
✅ The correct answer is option A.
When tc1 and tc2 are the temperatures of cold fluid at entry and exit respectively and th1 and th2 are the temperatures of hot fluid at entry and exit point, and cold fluid has lower heat capacity rate as compared to hot fluid, then effectiveness of the heat exchanger is given by
✅ The correct answer is option D.
In a parallel flow heat exchanger, the rate of flow of heat and the rate of decrease of temperature are maximum.
Yes
No
✅ The correct answer is option A.
Which of the following refrigerant has the lowest freezing point?
R-11
R-12
R-22
Ammonia
✅ The correct answer is option C.