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Heat Transfer

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

Oily
Smooth
Glazed & polished
Coated

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Heat Transfer
Harmonic mean temperature difference is given by

√(ΔT₁ . ΔT₂)
(ΔT₁ - ΔT₂)/(ΔT₁ . ΔT₂)
2.(ΔT₁ . ΔT₂)(ΔT₁ - ΔT₂)
2.(ΔT₁ . ΔT₂)/(ΔT₁ + ΔT₂)

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

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

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Heat Transfer
Boiling point elevation of an ideal solution

Both B and C
Decreases rapidly with temperature rise
Increases rapidly with temperature rise
In independent of pressure

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Heat Transfer
Steam is routed through the tube in case of a __________ evaporator.

Horizontal tube
Short tube vertical
Basket type
Long tube vertical

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Heat Transfer
Kg of liquid evaporated per hour in an evaporator is defined as its

Capacity
Steam load
None of these
Economy

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