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In forced convection, the heat transfer depends on

Q.  
In forced convection, the heat transfer depends on


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Answer :   Option: A


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Prandtl number is the ratio of

A. momentum diffusivity to mass diffusivity

B. momentum diffusivity to thermal diffusivity

C. thermal diffusivity to mass diffusivity

D. thermal diffusivity to momentum diffusivity


Answer & Explanation

Q.  
Heat transfer by natural convection is enhanced in system with

A. high viscosity

B. high co-efficient of thermal expansion

C. low temperature gradients

D. low density change with temperature


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Q.  
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe ?

A. 0.5

B. <0.5

C. >0.6

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Which area is used in case of heat flow by conduction through a cylinder

A. Logarithmic mean area

B. Arithmetic mean area

C. Geometric mean area

D. None of these


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