Heat Transfer
For a given ambient air temperature with increase in the thickness of insulation of a hot cylinderical pipe, the rate of heat loss from the surface would

First decrease and then increase
Decrease
First increase and then decrease
Increase

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Heat Transfer
Baffle spacing

Is not the same as baffle pitch
None of these
Should be less than the inside diameter of the shell
Should be less than one fifth the diameter of the shell

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