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Heat Transfer

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

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

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Heat Transfer
For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is

Nu = Gz
Nu = 0.023 Re0.8 . Pr0.4
Nu = Gz
Nu = 2Gz0.5

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Heat Transfer
Boiling point of a solution according to Duhring's rule is a linear function of the __________ of water.

Viscosity
Thermal conductivity
Boiling point (at the same pressure)
Density

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Heat Transfer
Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

Exit fluid temperature < wall temperature
Graetz number > 100
Exit-fluid temperature > wall temperature
Exit fluid temperature = wall temperature

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Heat Transfer
In case of __________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid.

None of these
Pool
Nucleate
Low pressure

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Heat Transfer
Air is best heated with steam in a heat exchanger of

double pipe type with fin on air side
double pipe type with fin on steam side
plate type
shell and tube type

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