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Heat Transfer

Heat Transfer
Which of the following has the minimum absorptivity?

Refractory bricks
Iron plates
Coal dust
Aluminium foil

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Heat Transfer
In a multiple effect evaporator, the effect of boiling point elevation is to

reduce the capacity
reduce the economy
increase the economy
all of the listed here

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Heat Transfer
Heat flux through several resistances in series in analogous to the current flowing through several.

resistances in parallel
none of the listed here
capacitors in series
resistances in series

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Heat Transfer
Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid

none of the listed here
for fluids in laminar flow
for fluids in tubulent flow
when Grashhoff number is very important

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Heat Transfer
What is the steam economy in case of a single effect evaporator system?

< 1
0.1
1
>1

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Heat Transfer
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is

Dependent on NRe only
1.66
88.66
3.66

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