1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m² and the overall heat transfer co-efficient to the liquid is 1500 W/m².°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be

Heat Transfer
1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m² and the overall heat transfer co-efficient to the liquid is 1500 W/m².°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be

15 min

22 min

51 min

44 min

15 min

22 min

51 min

44 min

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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

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

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

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

Graetz

None of these

Stanton

Peclet

Graetz

None of these

Stanton

Peclet

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Heat Transfer
The thickness of condensate layer in filmwise condensation depends on the

Liquid flow rate from the surface

All of these

Condensation rate

Surface configuration

Liquid flow rate from the surface

All of these

Condensation rate

Surface configuration

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Heat Transfer
In SI units, fouling factor is expressed in

W/m²°K

m²°K/W

m²°K

m°K/W

W/m²°K

m²°K/W

m²°K

m°K/W

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Heat Transfer
A body is called grey if the monochromatic emissivity of the body is

Same for all wavelengths

Unity

Zero

Different for all wavelengths

Same for all wavelengths

Unity

Zero

Different for all wavelengths

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Heat Transfer

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

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

Heat Transfer The thickness of condensate layer in filmwise condensation depends on the

Heat Transfer In SI units, fouling factor is expressed in

Heat Transfer A body is called grey if the monochromatic emissivity of the body is

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

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

Heat Transfer
The thickness of condensate layer in filmwise condensation depends on the

Heat Transfer
In SI units, fouling factor is expressed in

Heat Transfer
A body is called grey if the monochromatic emissivity of the body is