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Heat Transfer

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

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

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Heat Transfer
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

894W/m².K
287 W/m².K
333W/m².K
1200W/m².K

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Heat Transfer
A 2-4 heat exchanger involves

Smaller pressure drop compared to 1-2 exchanger
Only counter-flow of fluids
Only parallel-flow of fluids
Both counter and parallel-flow of the fluids

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Heat Transfer
Presence of a non-condensing gas in a condensing vapour

is desirable to increase the film co-efficient
decreases thermal resistance
None of the listed here
increases the rate of condensation

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Heat Transfer
Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid?

Vent
Catchall
Bleed point
Baffle

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Heat Transfer
For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is

Nu = 2Gz0.5
Nu = 0.023 Re0.8 . Pr0.4
Nu = Gz
Nu = Gz

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