Heat and Mass Transfer
Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

0.084027777777778
0.042361111111111
0.043055555555556
0.16736111111111

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Heat and Mass Transfer
The time constant of a thermocouple is

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

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