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Heat Transfer

Heat Transfer
Evaporator tubes are generally

Vertical
Random
Inclined
Horizontal

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Heat Transfer
Absorptivity and refletivity of a perfect black body are respectively

0 and 0.5
0 and 1
1 and ?
1 and 0

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Heat Transfer
With increase in temperature, the thermal conductivity of a gas

Remains same
May increase or decrease depending on the type of gas
Increases
Decreases

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Heat Transfer
The equation, Nst = f/2, is the __________ analogy.

Colburn
None of these
Prandtl
Reynolds

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Heat Transfer
In thermal radiation for a black body (where, ε is emissivity and α is absorptivity)

α = 1; ε = 1
α ≠ 1, ε = 1
α ≠ 1, ε ≠ 1
α = 1; ε ≠ 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

1.66
88.66
3.66
Dependent on NRe only

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MORE MCQ ON Heat Transfer

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