Heat Transfer
The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is

Some
Less
More
Either more or less ; depends on the nature of vapor

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Heat Transfer
Nusselt number is the ratio of the

Temperature difference to the temperature gradient at the wall
Heat flux at the wall to that across the entire pipe
None of these
Temperature gradient of the wall to that across the entire pipe

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Heat Transfer
A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m².°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be

Greater than that for uninsulated steam pipe
Equal to that of the uninsulated steam pipe
Less than that of the uninsulated steam pipe
Less than the steam pipe with 5 cms insulation

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