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Heat Transfer

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

None of these
1.49
4.88
1

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Heat Transfer
A concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires

Less heating surface
Lower maintenance cost
None of these
More space

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Heat Transfer
In Fourier's law, the proportionality constant is called the

Heat transfer co-efficient
Thermal diffusivity
Stefan-Boltzman constant
Thermal conductivity

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Heat Transfer
The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is

More
Less
Either more or less ; depends on the nature of vapor
Some

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Heat Transfer
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is

Dependent on NRe only
3.66
88.66
1.66

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Heat Transfer
For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.

High
Extremely low
Low
No

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