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Heat Transfer

Heat Transfer
What is the absorptivity of a black body?

0.95
1
0.78

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Heat Transfer
Which of the following has maximum thermal conductivity?

Nitrogen
Iron
Coal
Tar

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Heat Transfer
Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.

26
18
7
1

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Heat Transfer
In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always

1
> 1
< 1
∞

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Heat Transfer
Multiple effect evaporation accounts for

Lower operating costs
None of these
Investment economy
Steam economy

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Heat Transfer
The Stefan-Boltzman constant depends on the

Medium
Surface
Temperature
None of these

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