Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Heat Transfer
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Finned tube heat exchanger with air outside and steam inside

Shell and tube heat exchanger with air on shell side and steam inside tubes

Shell and tube heat exchanger with air inside tubes and steam on shell side

Finned tube heat exchanger with air inside and steam outside

Finned tube heat exchanger with air outside and steam inside

Shell and tube heat exchanger with air on shell side and steam inside tubes

Shell and tube heat exchanger with air inside tubes and steam on shell side

Finned tube heat exchanger with air inside and steam outside

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Heat Transfer
Which of the following has the lowest Prandtl number?

Water

Molten sodium (a coolant used in fast breeder reactor)

Dilute H₂SO₄

Transformer oil

Water

Molten sodium (a coolant used in fast breeder reactor)

Dilute H₂SO₄

Transformer oil

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Heat Transfer
Heat exchangers operating, when the asymptotic range is reached,

Provide very large heat transfer co-efficient

None of these

Results in abruptly increased velocity

Results in making part of the heating surface inactive

Provide very large heat transfer co-efficient

None of these

Results in abruptly increased velocity

Results in making part of the heating surface inactive

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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 = 283 s

t = 400 s

t = 800 s

t = 356 s

t = 283 s

t = 400 s

t = 800 s

t = 356 s

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Heat Transfer
Double pipe heat exchangers are used

when heat transfer area required is very high

because it occupies less floor area

because it is less costly

when heat transfer area required is very low

when heat transfer area required is very high

because it occupies less floor area

because it is less costly

when heat transfer area required is very low

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Heat Transfer
For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it

Decreases the outlet temperature of cooling medium

None of these

Decreases the pressure drop

Increases the overall heat transfer coefficient

Decreases the outlet temperature of cooling medium

None of these

Decreases the pressure drop

Increases the overall heat transfer coefficient

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Heat Transfer

Heat Transfer Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Heat Transfer Which of the following has the lowest Prandtl number?

Heat Transfer Heat exchangers operating, when the asymptotic range is reached,

Heat Transfer Double pipe heat exchangers are used

Heat Transfer For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it

Heat Transfer
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Heat Transfer
Which of the following has the lowest Prandtl number?

Heat Transfer
Heat exchangers operating, when the asymptotic range is reached,

Heat Transfer
Double pipe heat exchangers are used

Heat Transfer
For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it