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Heat Transfer

Heat Transfer
In SI units, thermal conductivity is expressed in

Watt/m4. °K
Watt/m.°K
Watt/m². °K
Watt/m². °K

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

Corrosive
Highly viscous
Salty
Scaling

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Heat Transfer
All analogy equations connecting friction factor and heat transfer co-efficient apply only to

Form friction
Turbulent flow
Wall or skin friction
Both A and B

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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?

43.75
48.25
35.5
81.25

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Heat Transfer
Unsteady state heat conduction occurs, when

Heat flows in one direction only
Temperature distribution is independent of time
Three dimensional heat flow is concerned
Temperature distribution is dependent on time

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Heat Transfer
Circulation pump is located below the evaporater to

Avoid cavitation
Create more suction head
None of these
Avoid frequent priming

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