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Heat Transfer

Heat Transfer
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

1.49
None of these
1
4.88

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Heat Transfer
Which of the following is correct ?

Rate = Driving force x Resistance
Resistance = Driving force x Rate
Driving force = Rate x Resistance
Rate = Resistance/Driving force

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Heat Transfer
The actual temperature drop across the heating surface of an evaporator depends on the

Liquid depth over the heating surface
Solution being evaporated
Pressure difference between the steam chest and the vapor space above the boiling liquid
All of these

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Heat Transfer
The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by __________ times, when the number of tube passes is increased to 8.

20.4
40.4
40.8
20.8

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Heat Transfer
Reason for operating an evaporator in multiple effect is to secure

Increased steam economy
Both A and B
Increased capacity
Decreased steam consumption

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Heat Transfer
What is the geometric mean of two heat transfer areas A₁ and A₂ ?

1/2 √(A₁ . A₂)
√(A₁ . A₂)
2 √(A₁ . A₂)
√(A₁ + A₂)

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