Heat and Mass Transfer
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

Reynold's number, Grashoff's number
Reynold's number
Grashoff's number
Prandtl number, Grashoff's number

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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
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

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