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Heat Transfer

Heat Transfer
The ratio of momentum diffusivity to thermal diffusivity is the __________ number.

Prandtl
Nusselt
Grashoff
Stanton

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Heat Transfer
In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms⁻². Neglecting the heat capacity of agitator, the temperature of water (in °C) is

40.5
34.4
25
26.8

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Heat Transfer
The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the

None of these
Evaporators opreate at atmospheric pressure
Solution has an elevation of boiling point
Evaporators operate under vacuum

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Heat Transfer
LMTD can't be used as such without a correction factor for the

Multipass heat exchanger
Condensation of mixed vapour in a condenser
All of these
Baffled heat exchanger

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Heat Transfer
Unsteady state heat conduction occurs, when

Three dimensional heat flow is concerned
Temperature distribution is independent of time
Temperature distribution is dependent on time
Heat flows in one direction only

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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

R₂/(R₁+R₂)
1
(R₁/R₂)2

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