Heat and Mass Transfer
The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.

Equal to
Directly proportional to
None of these
Inversely proportional to

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Heat and Mass Transfer
A steam pipe is to be insulated by two insulating materials put over each other. For best results

Both may be put in any order
Better insulation should be put over pipe and better one over it
Inferior insulation should be put over pipe and better one over it
Whether to put inferior OIL over pipe or the better one would depend on steam temperature

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Heat and Mass Transfer
The time constant of a thermocouple is

The time taken to attain the final temperature to be measured
The time taken to attain 63.2% of the value of initial temperature difference
Determined by the time taken to reach 100°C from 0°C
The time taken to attain 50% of the value of initial temperature difference

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