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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 )

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

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Heat Transfer
Fruit juice (a heat sensitive material) can be concentrated in a __________ evaporator.

None of these
Long tube
Falling film
High pressure

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Heat Transfer
For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

NPr-1/3
NPr1/3
NPr-1
NPr

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Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Corrosive
Salty
Highly viscous
Scaling

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Heat Transfer
'Duhring's plot' is of use in

Absorption
Extractive distillation
Evaporation
Leaching

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Heat Transfer
In thermal radiation for a black body (where, ε is emissivity and α is absorptivity)

α ≠ 1, ε = 1
α = 1; ε = 1
α ≠ 1, ε ≠ 1
α = 1; ε ≠ 1

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MORE MCQ ON Heat Transfer

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