Physics Test Preparations On Heat Transfer Refrigeration Air Conditioning Part 1

Test Preparation on Physics Test Preparations On Heat Transfer Refrigeration Air Conditioning Part 1

1.

Which of the following statement is wrong?

1The heat transfer in liquid and gases takes place according to convection.
2The amount of heat flow through a body is dependent upon the material of the body.
3The thermal conductivity of solid metals increases with rise in temperature,
4Logarithmic mean temperature difference is not equal to the arithmetic mean temperature difference.

2.

In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

1Reynold's number
2Grashoff's number
3Reynold's number, Grashoff's number
4Prandtl number, Grashoff's number

3.

The by-pass factor for a cooling coil

1increases with increase in velocity of air passing through it
2decreases with increase in velocity of air passing through it
3remains unchanged with increase in velocity of air passing through it
4may increase or decrease with increase in velocity of air passing through it depending upon the condition of air entering

4.

The formation of frost on cooling coils in a refrigerator

1increases heat transfer
2improves C.O.P. of the system
3increases power consumption
4reduces power consumption

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