For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then

Heat Transfer
For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then

hf = hd

hf could be greater or smaller than hd

hf > hd

hf < hd

hf = hd

hf could be greater or smaller than hd

hf > hd

hf < hd

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Heat Transfer
(NRe.NPr)(D/L) is called the __________ number

Stanton

Peclet

Graetz

None of these

Stanton

Peclet

Graetz

None of these

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Heat Transfer
A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions ? Assume that the conductive heat transfer co-efficient is infinitely large.

5 minutes

20 minutes

10 minutes

40 minutes

5 minutes

20 minutes

10 minutes

40 minutes

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Heat Transfer
Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is

0.4

0.2

0.8

0.6

0.4

0.2

0.8

0.6

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Heat Transfer
In a multiple effect evaporator, the effect of boiling point elevation is to

all of the listed here

reduce the economy

increase the economy

reduce the capacity

all of the listed here

reduce the economy

increase the economy

reduce the capacity

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

All of these

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

Presence of a non-condensible gas decreases the condensing film co-efficient

All of these

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

Presence of a non-condensible gas decreases the condensing film co-efficient

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Heat Transfer

Heat Transfer For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then

Heat Transfer (NRe.NPr)(D/L) is called the __________ number

Heat Transfer Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is

Heat Transfer In a multiple effect evaporator, the effect of boiling point elevation is to

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

Heat Transfer
For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then

Heat Transfer
(NRe.NPr)(D/L) is called the __________ number

Heat Transfer
Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is

Heat Transfer
In a multiple effect evaporator, the effect of boiling point elevation is to

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