The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

Heat Transfer
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

894W/m².K

287 W/m².K

1200W/m².K

333W/m².K

894W/m².K

287 W/m².K

1200W/m².K

333W/m².K

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Heat Transfer
Which of the following is generally considered as opaque surface towards radiations?

Both solids & liquids

Solids

Liquids

Gases

Both solids & liquids

Solids

Liquids

Gases

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Heat Transfer
For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

NPr1/3

NPr-1

NPr-1/3

NPr

NPr1/3

NPr-1

NPr-1/3

NPr

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Heat Transfer
As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient

goes through a maximum.

continues to increase

continues to decrease

goes through a minimum

goes through a maximum.

continues to increase

continues to decrease

goes through a minimum

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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

Higher condensing film co-efficient is desired

Lower pressure drop through the exchanger is desired

Condensate is corrosive in nature

Temperature of the incoming vapor is very high

Higher condensing film co-efficient is desired

Lower pressure drop through the exchanger is desired

Condensate is corrosive in nature

Temperature of the incoming vapor is very high

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Heat Transfer
If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid

Remains unchanged

Increases

Decreases

Increases or decreases depending on number of shell passes

Remains unchanged

Increases

Decreases

Increases or decreases depending on number of shell passes

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Heat Transfer

Heat Transfer The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

Heat Transfer Which of the following is generally considered as opaque surface towards radiations?

Heat Transfer For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

Heat Transfer As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient

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

Heat Transfer If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid

Heat Transfer
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

Heat Transfer
Which of the following is generally considered as opaque surface towards radiations?

Heat Transfer
For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

Heat Transfer
As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient

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

Heat Transfer
If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid