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Heat Transfer

Heat Transfer
1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is

200
400
520
500

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Heat Transfer
Heat transfer rate per unit area is called

heat transfer co-efficient
thermal conductivity
thermal diffusivity
heat flux

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Heat Transfer
The critical radius 'r' of insulation on a pipe is given by

r = k/h
r = h/k
r = k/2h
r = 2k/h

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Heat Transfer
Temperature profile in steady state heat transfer is

none of the listed here
hyperbolic
Linear
parabolic

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Heat Transfer
Boiling point elevation of a solution of NaOH

Increases rapidly with temperature rise
Is almost independent of temperature
Is almost independent of pressure
Both B and C

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Heat Transfer
Harmonic mean temperature difference is given by

2.(ΔT₁ . ΔT₂)/(ΔT₁ + ΔT₂)
(ΔT₁ - ΔT₂)/(ΔT₁ . ΔT₂)
2.(ΔT₁ . ΔT₂)(ΔT₁ - ΔT₂)
√(ΔT₁ . ΔT₂)

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