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
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

Temperature of the incoming vapor is very high

Condensate is corrosive in nature

Higher condensing film co-efficient is desired

Lower pressure drop through the exchanger is desired

Temperature of the incoming vapor is very high

Condensate is corrosive in nature

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Heat Transfer
A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

Both A & B

Lower economy

Higher economy

Lower capacity

Both A & B

Lower economy

Higher economy

Lower capacity

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Heat Transfer
A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time

t = 356 s

t = 283 s

t = 800 s

t = 400 s

t = 356 s

t = 283 s

t = 800 s

t = 400 s

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Heat Transfer
The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )

ΔT

None of the listed here

(ΔT)1/4

(ΔT)2

ΔT

None of the listed here

(ΔT)1/4

(ΔT)2

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Heat Transfer
A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when

KA>2 kB

CPA < CPB

CPA > CPB

KA < 0.5kB

KA>2 kB

CPA < CPB

CPA > CPB

KA < 0.5kB

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Heat Transfer
A graph between __________ is called Wilson plot.

1/U Vs . 1/v0.8

1/v0.8 Vs . U

V0.8 Vs . U

1/U Vs . 1/V

1/U Vs . 1/v0.8

1/v0.8 Vs . U

V0.8 Vs . U

1/U Vs . 1/V

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Heat Transfer

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 A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

Heat Transfer The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )

Heat Transfer A graph between __________ is called Wilson plot.

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
A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

Heat Transfer
The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )

Heat Transfer
A graph between __________ is called Wilson plot.