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

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

Both B & C

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

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

Both B & C

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
With increase in temperature, the total emissivity of conductors

Decreases

Remains same

Decreases linearly

Increases

Decreases

Remains same

Decreases linearly

Increases

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Heat Transfer
Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be

0.35

0.45

0.55

0.85

0.35

0.45

0.55

0.85

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

Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature

All of these

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

Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature

All of these

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

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Heat Transfer
Vent pipes are provided in a condenser to

None of these

Facilitate easy cleaning of tubes

Remove non-condensable gases

Purge the condenser

None of these

Facilitate easy cleaning of tubes

Remove non-condensable gases

Purge the condenser

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Heat Transfer
A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is

48000

24000

6000

60000

48000

24000

6000

60000

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Heat Transfer

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 With increase in temperature, the total emissivity of conductors

Heat Transfer Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be

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

Heat Transfer Vent pipes are provided in a condenser to

Heat Transfer A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is

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
With increase in temperature, the total emissivity of conductors

Heat Transfer
Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be

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

Heat Transfer
Vent pipes are provided in a condenser to

Heat Transfer
A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is