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Heat Transfer

Heat Transfer
The unit of conductance in SI unit is

W/°K
W/m²
W/m
W/m°K

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Heat Transfer
Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface?

Interfacial tension
Liquid density
Liquid viscosity
Hot surface temperature

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Heat Transfer
Natural convection is characterised by

Reynolds number
Prandtl number
Peclet number
Grashhoff number

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Heat Transfer
A sphere of radius 'R₁' is enclosed in a sphere of radius 'R₂'. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is

(R₁/R₂)2
1
R₂/(R₁+R₂)

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Heat Transfer
Water is normally used as a coolant in the heat exchange equipments mainly because ofits

Low viscosity
High fluidity
Low density
Abundance & high heat capacity

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Heat Transfer
In a forward feed multiple effect evaporator, the pressure is

Same in all effects
Dependent on the number of effects
Highest in last effect
Lowest in last effect

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