# 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

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

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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