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Heat Transfer

Heat Transfer
Peclet number (Pe) is given by

Pe = Re/Pr
Pe = Nu.Re
Pe = Pr/Re
Pe = Re.Pr

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Heat Transfer
Thermal conductivity of a gas at low density, __________ with increase in temperature.

Increases
Remains unchanged
May increase or decrease; depends on the gas
Decreases

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Heat Transfer
For specified tube outside diameter, higher BWG means higher

tube thickness
cross-sectional area
weight per unit length
none of the listed here

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Heat Transfer
The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is

4
43832
2
43834

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Heat Transfer
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

None of these
4.88
1
1.49

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Heat Transfer
The ratio of momentum diffusivity to thermal diffusivity is the __________ number.

Grashoff
Stanton
Prandtl
Nusselt

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