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Heat Transfer

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 variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K₀ + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be

W/m.k²
W/m.k
W/m
None, A is just a number

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Heat Transfer
In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is

Zero
Minimum
Maximum
Infinity

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Heat Transfer
The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )

(ΔT)1/4
ΔT
(ΔT)2
None of the listed here

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Heat Transfer
A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest ?

Sphere
Cube
Plate
All of these

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Heat Transfer
Baffles are provided in heat exchangers to increase the

Heat transfer rate
Heat transfer area
Heat transfer co-efficient
Fouling factor

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MORE MCQ ON Heat Transfer

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