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Heat Transfer

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

Graetz
Stanton
Peclet
None of these

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Heat Transfer
Dropwise condensation is promoted on a/an __________ surface.

Coated
Oily
Glazed
Smooth

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Heat Transfer
With increase in temperature, the thermal conductivity of steel

Remains unchanged
Increases exponentially
Increases
Decreases

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Heat Transfer
Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids?

Dittus-Boeltier equation
Sieder-Tate equation
Nusselt equation
None of these

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Heat Transfer
The critical radius 'r' of insulation on a pipe is given by

r = h/k
r = 2k/h
r = k/2h
r = k/h

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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

< 1
L
0.1
>1

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