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Heat Transfer

Heat Transfer
Prandtl number for most of dry gases is about

0.72
150
0.001
70

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Heat Transfer
The critical radius of insulation for cylindrical pipe is (where, hi = heat transfer coefficient at inside of the pipe )

2hi/K
hi/K
K/h0
2K/h0

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Heat Transfer
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface tempeature follows __________ law.

Logarithmic
Hyperbolic
Linear
Parabolic

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Heat Transfer
The separation of liquid droplets from the vapor is done by a/an __________ , in the evaporators.

Compressor
Steam ejector
Entrainment separator
Vacuum pump

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Heat Transfer
Fourier's law applies to the heat transfer by

convection
conduction
None of the listed here
radiation

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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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