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Heat Transfer

Heat Transfer
Stefen's block body radiation law can also be derived from __________ law.

None of these
Kirchoffs
Planck's
Fourier's

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Heat Transfer
At constant temperature, the thermal conductivities of gases __________ with rise in pressure.

Remain unchanged
May increase or decrease; depends on the pressure
Increase
Decrease

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

None of these
1.49
1
4.88

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Heat Transfer
For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

Is easy to operate and maintain
All of these
Is more economical
Occupies smaller space

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Heat Transfer
Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats

P and S
P and R
R and S
P and Q

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Heat Transfer
For a given ambient air temperature with increase in the thickness of insulation of a hot cylinderical pipe, the rate of heat loss from the surface would

First increase and then decrease
Decrease
Increase
First decrease and then increase

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