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Heat and Mass Transfer

Heat and Mass Transfer
Which of the following is a case of steady state heat transfer?

Air preheaters
I.C. engine
Heating of building in winter
None of these

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Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

0.002
0.01
0.02
0.1

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Heat and Mass Transfer
The product of Reynolds number and Prandtl number is known as

Peclet number
Grashoff number
Stanton number
Biot number

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Heat and Mass Transfer
An ordinary passenger aircraft requires a cooling system of capacity.

8 TR
4 TR
2 TR
10 TR

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Heat and Mass Transfer
Reynolds number is the ratio of

Inertia force to viscous force
Kinematic viscosity to thermal diffusivity
Energy transferred by convection to that by conduction
None of these

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Heat and Mass Transfer
The value of Prandtl number for air is about

1.7
0.1
0.3
0.7

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