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Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary...

Q.  
Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is


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Answer :   Option: B


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The unit of heat transfer co-efficient in SI unit is

A. J/m2°K

B. W/m2°K

C. W/m°K

D. J/m°K


Answer & Explanation

Q.  
Which of the following has the lowest Prandtl number ?

A. Molten sodium (a coolant used in fast breeder reactor)

B. Water

C. Transformer oil

D. Dilute H2SO4


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Q.  
At Pr >1, conduction in an ordinary fluid flowing through a heated pipe is limited to the

A. buffer zone

B. turbulent core

C. both (a) and (b)

D. viscous sub-layer


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Q.  
Heat transfer co-efficient (h1) for liquids increases with

A. increasing temperature

B. decreasing temperature

C. decreasing Reynolds number

D. none of these


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