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Pick out the wrong statement.


A) Bubble size increases with the dynamic viscosity of the liquid in case of nucleate pool boiling
B) Thermal conductivity of a dry material is more than that of the damp material
C) Ratio of its capacity to economy equals the steam consumption in kg/hr in an evaporator
D) Vaporisation of organic substances in evaporator mostly causes foam formation

Correct Answer

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The equation, Nst = f/2, is the __________ analogy.


A) Colburn
B) Reynolds
C) Prandtl
D) None of these

Correct Answer

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Cpµ/K is termed as the __________ number.


A) Grashoff
B) Nusselt
C) Prandtl
D) Stanton

Correct Answer

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In Biot number, the characteristic length used is the ratio of the __________ of the solid.


A) Volume to surface area
B) Perimeter to surface area
C) Surface area to volume
D) Surface area to perimeter

Correct Answer

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Nusselt number is a function of Prandtl number and __________ number of fluid in natural convection heat transfer.


A) Grashoff
B) Biot
C) Stanton
D) Reynolds

Correct Answer

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