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Heat Transfer

Heat Transfer
Removal of __________ heat is involved in the condensation of a vapor under saturated conditions.

Latent
Both B & C
Super
Sensible

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Heat Transfer
Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.

lower
the least
the largest
no

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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

1
(R₁/R₂)2
R₂/(R₁+R₂)

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Heat Transfer
Thermal conductivities of most of the liquids __________ with rise in temperature.

Remains unchanged
Increases
Decreases
May increase or decrease; depends on the liquid

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Heat Transfer
For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

NPr-1/3
NPr1/3
NPr-1
NPr

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Heat Transfer
Black liquor generated during paper manufacture is concentrated in a

multiple effect evaporator
single effect evaporator followed by a crystalliser
multiple effect evaporators followed by a crystalliser
single effect evaporator

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