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Heat Transfer

Heat Transfer
Which of the following has maximum thermal conductivity?

Coal
Iron
Nitrogen
Tar

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Heat Transfer
Analogy between mass and heat transfer is not applicable in case of

Both B and C
Thermal or pressure mass diffusion
Viscous heating or chemical reaction
Same velocity profile or equal eddy diffusivities

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Heat Transfer
Economy of an evaporator is influenced by the

Steam pressure
Both B & C
Number of effect
Feed temperature

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Heat Transfer
Dropwise condensation occurs on __________ surfaces

polished
contaminated cooling
clean and dirt free
smooth clean

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Heat Transfer
Tubes are held between top and bottom tube sheets in Calenderia type evaporator by keeping

Both the tube sheets floating
Both the tube sheets fixed
The top tube sheet fixed and the bottom tube-sheet floating
The top tube sheet floating and bottom tube sheet fixed

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Heat Transfer
Conductance is given by(where, x = thickness, A = heat flow area, K = thermal conductivity.)

KA/x
X/KA
K/Ax
A/Kx

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MORE MCQ ON Heat Transfer

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