Heat Transfer
The Fourier number (defined as a.t/L²) is used in the analysis of problem involving heat transfer by

Transient conduction
Forced convection
Steady state conduction
Natural convection

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Heat Transfer
Nusselt number is the ratio of the

None of these
Temperature gradient of the wall to that across the entire pipe
Heat flux at the wall to that across the entire pipe
Temperature difference to the temperature gradient at the wall

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Heat Transfer
Prandtl number is the ratio of

Momentum diffusivity to thermal diffusivity
Thermal diffusivity to mass diffusivity
Thermal diffusivity to momentum diffusivity
Momentum diffusivity to mass diffusivity

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