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Heat Transfer

Heat Transfer
The most conducive surface for dropwise condensation to occur is the __________ surface.

Coated
Smooth
Glazed & polished
Oily

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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
Heat flux is the time rate of heat transfer per unit

none of the listed here
area
length
volume

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Heat Transfer
What is the geometric mean of two heat transfer areas A₁ and A₂ ?

√(A₁ + A₂)
1/2 √(A₁ . A₂)
2 √(A₁ . A₂)
√(A₁ . A₂)

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Heat Transfer
In case of a vertical tube evaporator, with increase in the liquor level, the

Both B and C
True temperature drop increases
Capacity of the evaporator is increased
Capacity of the evaporator is decreased

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Heat Transfer
Which has the lowest Prandtl number?

Lube oil
Water
Liquid metal
Aqueous solution

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