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Heat Transfer

Heat Transfer
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

1.49
1
4.88
None of these

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Heat Transfer
In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is

Zero
Same as average heat transfer co-efficient for tube side
None of these
Infinity

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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

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

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Heat Transfer
A diathermaneous substance __________ the thermal radiation completely.

Transmits
Reflects
Absorbs
None of these

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Heat Transfer
The purpose of providing bleed points in the evaporator is to

Create vacuum
Admit the feed
Remove the product
Facilitate removal of non-condensable gases

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Heat Transfer
In an extended surface heat exchanger, fluid having lower co-efficient

Flows outside the tubes
Can flow either inside or outside the tubes
Flows through the tube
Should not be used as it gives very high pressure drop

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