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

1200W/m².K

894W/m².K

287 W/m².K

333W/m².K

1200W/m².K

894W/m².K

287 W/m².K

333W/m².K

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Heat Transfer
Fouling factor

Is a dimensionless quantity

Does not provide a safety factor for design

None of these

Accounts for additional resistances to heat flow

Is a dimensionless quantity

Does not provide a safety factor for design

None of these

Accounts for additional resistances to heat flow

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Heat Transfer
In counter flow compared to parallel flow,

Less surface area is required for a given heat transfer rate

LMTD is greater

Both A and B

More surface area is required for a given heat transfer rate

Less surface area is required for a given heat transfer rate

LMTD is greater

Both A and B

More surface area is required for a given heat transfer rate

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Heat Transfer
Steam economy in case of a triple effect evaporator will be

> 1

< 1

1

Between 0 and 1

> 1

< 1

1

Between 0 and 1

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

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

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

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

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

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
For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

Is easy to operate and maintain

Is more economical

Occupies smaller space

All of these

Is easy to operate and maintain

Is more economical

Occupies smaller space

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 Fouling factor

Heat Transfer In counter flow compared to parallel flow,

Heat Transfer Steam economy in case of a triple effect evaporator will be

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

Heat Transfer For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

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
Fouling factor

Heat Transfer
In counter flow compared to parallel flow,

Heat Transfer
Steam economy in case of a triple effect evaporator will be

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

Heat Transfer
For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it