Mechanical Engineering Test Preparations On Heat Transfer, Refrigeration and Air Conditioning Part 1
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Test Preparation on Mechanical Engineering Test Preparations On Heat Transfer, Refrigeration and Air Conditioning Part 1
1.
Which of the following statement is wrong?
1
The heat transfer in liquid and gases takes place according to convection.
2
The amount of heat flow through a body is dependent upon the material of the body.
3
The thermal conductivity of solid metals increases with rise in temperature,
4
Logarithmic 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
1
Reynold's number
2
Grashoff's number
3
Reynold's number, Grashoff's number
4
Prandtl number, Grashoff's number
3.
The by-pass factor for a cooling coil
1
increases with increase in velocity of air passing through it
2
decreases with increase in velocity of air passing through it
3
remains unchanged with increase in velocity of air passing through it
4
may 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
1
increases heat transfer
2
improves C.O.P. of the system
3
increases power consumption
4
reduces power consumption
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