Heat Transfer
Heat produced when a steady state current, I passes through an electrical conductor having resistance, 'R' is

IR
IR2
I2R
None of the listed here

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Heat Transfer
In a gas-liquid shell and tube heat exchanger, the

Presence of a non-condensible gas decreases the condensing film co-efficient
Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes
All of these
Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature

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Heat Transfer
A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time

t = 400 s
t = 283 s
t = 356 s
t = 800 s

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