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Heat Transfer

Heat Transfer
The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are

Re.Gz
Nu, Gz
Nu, Pr, Re
Nu, Pr

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Heat Transfer
Viscous & heat sensitive liquids are concentrated in __________ evaporators.

Long tube
None of these
Open pan
Agitated film

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Heat Transfer
Heat flux through several resistances in series in analogous to the current flowing through several.

none of the listed here
capacitors in series
resistances in series
resistances in parallel

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Heat Transfer
Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade?

35.5
81.25
43.75
48.25

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Heat Transfer
For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, Δt = excess temperature)

Δt
Δt³
√Δt
Δt²

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

Never different
Different
Linearly related
Same

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