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Heat Transfer

Heat Transfer
(NRe.NPr)(D/L) is called the __________ number

Graetz
Peclet
Stanton
None of these

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Heat Transfer
With increase in temperature, the thermal conductivity of a gas

May increase or decrease depending on the type of gas
Increases
Decreases
Remains same

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Heat Transfer
Evaporator tubes are generally

Horizontal
Random
Vertical
Inclined

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Heat Transfer
Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is

L
>1
< 1
0.1

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Heat Transfer
Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid

when Grashhoff number is very important
none of the listed here
for fluids in tubulent flow
for fluids in laminar flow

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Heat Transfer
Indirect contact heat exchangers are preferred over direct contact heat exchangers, because

There is no risk of contamination
Cost of equipment is lower
There is no mist formation
Heat transfer co-efficient are high

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