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Heat Transfer

Heat Transfer
Natural convection is characterised by

Reynolds number
Peclet number
Prandtl number
Grashhoff number

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Heat Transfer
A multiple effect evaporator as compared to a single effect evaporator of the same capacity has

Higher solute concentration in the product
Lower heat transfer area
Lower steam economy
Higher steam economy

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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
R₂/(R₁+R₂)
1

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Heat Transfer
In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is

Hyperbolic
Parabolic
Linear
None of these

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Heat Transfer
Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is

0.1
L
>1
< 1

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Heat Transfer
Absorptivity and refletivity of a perfect black body are respectively

1 and 0
0 and 0.5
0 and 1
1 and ?

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MORE MCQ ON Heat Transfer

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