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

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

More

Some

Less

Either more or less ; depends on the nature of vapor

More

Some

Less

Either more or less ; depends on the nature of vapor

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Heat Transfer
While the total emissivity of a perfect black body is unity, the same for a real body is

>1

1

0

between 0 and 1

>1

1

0

between 0 and 1

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Heat Transfer
In a shell and tube heat exchanger, floating head is used for

Low pressure drop

Less corrosion of tubes

Large temperature differentials

High heat transfer co-efficient

Low pressure drop

Less corrosion of tubes

Large temperature differentials

High heat transfer co-efficient

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Heat Transfer
A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case,

Both B & C

The cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant

Both will absorb equal amount of radiation from the surrounding in the beginning

Both the spheres will emit equal amount of radiation per unit time in the beginning

Both B & C

The cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant

Both will absorb equal amount of radiation from the surrounding in the beginning

Both the spheres will emit equal amount of radiation per unit time in the beginning

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Heat Transfer
The average heat transfer co-efficient over the entire length of the plate (ha) and the local heat transfer co-efficient (hL), in case of heat transfer over a flat plate in lminar zone is related as

Ha = 2hL

Ha= 5hL

Ha = 0.8hL

Ha = hL

Ha = 2hL

Ha= 5hL

Ha = 0.8hL

Ha = hL

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Heat Transfer
Which type of heat exchanger is preferred for heavy heat loads ?

Series and parallel set of shell and tube

None of the listed here

Plate fine

Double pipe

Series and parallel set of shell and tube

None of the listed here

Plate fine

Double pipe

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer

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

Heat Transfer While the total emissivity of a perfect black body is unity, the same for a real body is

Heat Transfer In a shell and tube heat exchanger, floating head is used for

Heat Transfer A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case,

Heat Transfer The average heat transfer co-efficient over the entire length of the plate (ha) and the local heat transfer co-efficient (hL), in case of heat transfer over a flat plate in lminar zone is related as

Heat Transfer Which type of heat exchanger is preferred for heavy heat loads ?

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

Heat Transfer
While the total emissivity of a perfect black body is unity, the same for a real body is

Heat Transfer
In a shell and tube heat exchanger, floating head is used for

Heat Transfer
A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case,

Heat Transfer
The average heat transfer co-efficient over the entire length of the plate (ha) and the local heat transfer co-efficient (hL), in case of heat transfer over a flat plate in lminar zone is related as

Heat Transfer
Which type of heat exchanger is preferred for heavy heat loads ?