Heat Transfer
Intermittant tube cleaning is possible to be done in case of a __________ evaporator.

Calendria
Basket type
None of these
Horizontal tube

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Heat Transfer
Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Condensate is corrosive in nature
Higher condensing film co-efficient is desired
Lower pressure drop through the exchanger is desired
Temperature of the incoming vapor is very high

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Heat Transfer
Nusselt number is the ratio of the

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

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