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

1200W/m².K

333W/m².K

287 W/m².K

894W/m².K

1200W/m².K

333W/m².K

287 W/m².K

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Heat Transfer
For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.

No

High

Low

Extremely low

No

High

Low

Extremely low

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Heat Transfer
The unit of conductance in SI unit is

W/m

W/m°K

W/°K

W/m²

W/m

W/m°K

W/°K

W/m²

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

continues to increase

goes through a maximum.

goes through a minimum

continues to decrease

continues to increase

goes through a maximum.

goes through a minimum

continues to decrease

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Heat Transfer
Which of the following situations can be approximated to a steady state heat transfer system?

A sub-cooled refrigerant liquid at 8°C flowing at the rate of 6 Kg/minute through a copper pipe exposed to atmospheric air at 35°C

Boiling brine kept in open vessel when the bottom surface temperature of the vessel is maintained constant at 180°C

10 kg of dry saturated steam at 8 kgf/cm² flowing through a short length of stainless steel pipe exposed to atmospheric air at 35°C

A red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmosheric air at 35°C

A sub-cooled refrigerant liquid at 8°C flowing at the rate of 6 Kg/minute through a copper pipe exposed to atmospheric air at 35°C

Boiling brine kept in open vessel when the bottom surface temperature of the vessel is maintained constant at 180°C

10 kg of dry saturated steam at 8 kgf/cm² flowing through a short length of stainless steel pipe exposed to atmospheric air at 35°C

A red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmosheric air at 35°C

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Heat Transfer
Vibrations in the tubes of a shell and tube heat exchanger is induced due to the

Vibrations transmitted through piping and/or supports due to external reasons

Flow of fluid on the tube and shell sides

Oscillations in the flow of shell/tube sides fluid

All of these

Vibrations transmitted through piping and/or supports due to external reasons

Flow of fluid on the tube and shell sides

Oscillations in the flow of shell/tube sides fluid

All of these

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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 For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.

Heat Transfer The unit of conductance in SI unit is

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

Heat Transfer Which of the following situations can be approximated to a steady state heat transfer system?

Heat Transfer Vibrations in the tubes of a shell and tube heat exchanger is induced due to the

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
For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.

Heat Transfer
The unit of conductance in SI unit is

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

Heat Transfer
Which of the following situations can be approximated to a steady state heat transfer system?

Heat Transfer
Vibrations in the tubes of a shell and tube heat exchanger is induced due to the