A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m².°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be

Heat Transfer
A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m².°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be

Less than the steam pipe with 5 cms insulation

Equal to that of the uninsulated steam pipe

Greater than that for uninsulated steam pipe

Less than that of the uninsulated steam pipe

Less than the steam pipe with 5 cms insulation

Equal to that of the uninsulated steam pipe

Greater than that for uninsulated steam pipe

Less than that of the uninsulated steam pipe

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Heat Transfer
Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is

0.6

0.7

0.4

0.5

0.6

0.7

0.4

0.5

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Heat Transfer
The ratio of momentum diffusivity to thermal diffusivity is the __________ number.

Prandtl

Grashoff

Stanton

Nusselt

Prandtl

Grashoff

Stanton

Nusselt

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Heat Transfer
Pick out the correct equation.

JH = (St)1/3(Pr) = f/2

JH = (St)2/3(Pr) = f/2

JH = (St)(Pr)2/3 = f/2

JH = (St)(Pr)1/3 = f/2

JH = (St)1/3(Pr) = f/2

JH = (St)2/3(Pr) = f/2

JH = (St)(Pr)2/3 = f/2

JH = (St)(Pr)1/3 = f/2

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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

Lower pressure drop through the exchanger is desired

Condensate is corrosive in nature

Higher condensing film co-efficient is desired

Temperature of the incoming vapor is very high

Lower pressure drop through the exchanger is desired

Condensate is corrosive in nature

Higher condensing film co-efficient is desired

Temperature of the incoming vapor is very high

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Heat Transfer
Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is

None of these

Uniformly distributed throughout the fluid

Mainly confined to a thin film of fluid near the surface

In the central core of the fluid

None of these

Uniformly distributed throughout the fluid

Mainly confined to a thin film of fluid near the surface

In the central core of the fluid

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Heat Transfer

Heat Transfer The ratio of momentum diffusivity to thermal diffusivity is the __________ number.

Heat Transfer Pick out the correct equation.

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 Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is

Heat Transfer
The ratio of momentum diffusivity to thermal diffusivity is the __________ number.

Heat Transfer
Pick out the correct equation.

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
Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is