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Heat Transfer

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

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

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Heat Transfer
Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator?

Agitated film evaporator
Long vertical evaporator
Calenderia vertical tube evaporator
Horizontal tube evaporator

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Heat Transfer
An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is

4000
9000
3000
4600

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Heat Transfer
Maximum heat transfer rate is obtained in __________ flow.

Transition region
Turbulent
Laminar
Creeping

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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.

Hyperbolic
Logarithmic
Linear
Parabolic

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Heat Transfer
For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are

Linearly related
Different
Same
Never different

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