Heat Transfer, Refrigeration and Air Conditioning - Part 1 Online Exam Quiz
Heat Transfer, Refrigeration and Air Conditioning - Part 1 GK Quiz. Question and Answers related to Heat Transfer, Refrigeration and Air Conditioning - Part 1. MCQ (Multiple Choice Questions with answers about Heat Transfer, Refrigeration and Air Conditioning - Part 1
The wet bulb temperature during sensible heating of air
Options
A : remains constant
B : increases
C : decreases
D : -
Which of the following statement is wrong?
Options
A : The heat transfer in liquid and gases takes place according to convection.
B : The amount of heat flow through a body is dependent upon the material of the body.
C : The thermal conductivity of solid metals increases with rise in temperature,
D : Logarithmic mean temperature difference is not equal to the arithmetic mean temperature difference.
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the
Options
A : Reynold's number
B : Grashoff's number
C : Reynold's number, Grashoff's number
D : Prandtl number, Grashoff's number
In a refrigerating machine, heat rejected is __________ heat absorbed.
Options
A : equal to
B : less than
C : greater than
D : -
The humidity ratio or specific humidity is the mass of water vapour present in
Options
A : 1 m 3 of wet air
B : 1 m 3 of dry air
C : 1 kg of wet air
D : 1 kg of dry air
The formation of frost on cooling coils in a refrigerator
Options
A : increases heat transfer
B : improves C.O.P. of the system
C : increases power consumption
D : reduces power consumption
The by-pass factor for a cooling coil
Options
A : increases with increase in velocity of air passing through it
B : decreases with increase in velocity of air passing through it
C : remains unchanged with increase in velocity of air passing through it
D : may increase or decrease with increase in velocity of air passing through it depending upon the condition of air entering
The difference between dry bulb temperature and wet bulb temperature, is called
Options
A : dry bulb depression
B : wet bulb depression
C : dew point depression
D : degree of saturation
Defrosting of a refrigerator may be done by stopping the compressor for a short period.
Options
A : Correct
B : Incorrect
C : -
D : -
According to Dalton's law of partial pressures, (where p b = Barometric pressure, p a = Partial pressure of dry air, and p v = Partial pressure of water vapour)
Options
A : P b = p a - p v
B : P b = p a + p v
C : P b = p a x p v
D : P b = p a / p v
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