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Heat Transfer

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

None of these
Graetz
Peclet
Stanton

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Heat Transfer
Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is

> 1
< 1
1
> 5

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Heat Transfer
In a cooling tower, water becomes cool by

Heat transfer to surroundings
Loosing sensible heat
Loosing latent heat
Vaporisation due to heat loss to air

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Heat Transfer
Tubes are held between top and bottom tube sheets in Calenderia type evaporator by keeping

The top tube sheet floating and bottom tube sheet fixed
The top tube sheet fixed and the bottom tube-sheet floating
Both the tube sheets fixed
Both the tube sheets floating

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Heat Transfer
In case of __________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid.

Low pressure
Pool
None of these
Nucleate

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Heat Transfer
__________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side.

Single pass, fixed tube sheet
U-tube
None of these
Three pass, fixed tube sheet

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