Heat and Mass Transfer
Thermal diffusivity of a substance is

Inversely proportional to specific heat
All of these
Directly proportional to the thermal conductivity
Inversely proportional to density of substance

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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 50% of the value of initial temperature difference
The time taken to attain 63.2% of the value of initial temperature difference
The time taken to attain the final temperature to be measured

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