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Heat Transfer

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

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

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Heat Transfer
__________ heat exchanger is used for chilling oil to be dewaxed.

U-tube
Floating head
Fixed tube
Double pipe

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Heat Transfer
Economy of an evaporator is influenced by the

Both B & C
Steam pressure
Feed temperature
Number of effect

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Heat Transfer
Prandtl number is the reciprocal of

Thermal diffusivity/Momentum diffusivity
Mass diffusivity x Momentum diffusivity
Thermal diffusivity x Mass diffusivity
Thermal diffusivity x Momentum

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Heat Transfer
Overall heat transfer co-efficient for cooling of hydrocarbons by water is about

50 -100 Kcal/hr.m².°C
1000 - 1500 BTU/hr. ft.2°F
50 -100 BTU/hr. ft.2°F
50 -100 W/m² . °K

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Heat Transfer
__________ paint has the minimum absorption co-efficient.

White lead
Light cream
Grey
Black

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MORE MCQ ON Heat Transfer

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