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Heat Transfer

Heat Transfer
Electromagnetic radiations propagate in vacuum with a velocity of __________ metre/second.

3 x l08
3 x l012
3 x l010
3 x l05

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Heat Transfer
Which is the most suitable for cold viscous feed?

Parallel feed
Backward feed
Forward feed
Mixed feed

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Heat Transfer
In the free convection regime of pool boiling, the heat flux is proportional to

Δt2
Δt
Δt1/2
Δt5/4

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Heat Transfer
When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids?

At high fluid velocity
At low velocity
When fluid flows past a smooth surface
None of these

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Heat Transfer
The actual temperature drop across the heating surface of an evaporator depends on the

Solution being evaporated
All of these
Liquid depth over the heating surface
Pressure difference between the steam chest and the vapor space above the boiling liquid

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Heat Transfer
Thermal conductivity of a gas at low density, __________ with increase in temperature.

Decreases
Increases
Remains unchanged
May increase or decrease; depends on the gas

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