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

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 = 800 s

t = 283 s

t = 400 s

t = 356 s

t = 800 s

t = 283 s

t = 400 s

t = 356 s

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Heat Transfer
In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

By heating an intermediate material (like chequor bricks) and then heating the air from this hot material

None of these

By direct contact of hot flue gas with air

Through a metallic wall

By heating an intermediate material (like chequor bricks) and then heating the air from this hot material

None of these

By direct contact of hot flue gas with air

Through a metallic wall

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Heat Transfer
Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by

None of these

Increasing the tube length

Enhancing the fluid pumping rate

Keeping the heat transfer surface clean

None of these

Increasing the tube length

Enhancing the fluid pumping rate

Keeping the heat transfer surface clean

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Heat Transfer
For concentrating an aqueous solution of a material like anhydrous Na₂SO₄, whose solubility decreases with rise in temperature, the most suitable evaporator is a __________ evaporator.

Vacuum

Backward feed

High pressure

None of these

Vacuum

Backward feed

High pressure

None of these

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Heat Transfer
The overall resistance for heat transfer through a series of flat resistance, is the __________ of the resistances.

Sum

Geometric mean

Average

Product

Sum

Geometric mean

Average

Product

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Heat Transfer
In a shell and tube heat exchanger, floating head is used for

Large temperature differentials

High heat transfer co-efficient

Less corrosion of tubes

Low pressure drop

Large temperature differentials

High heat transfer co-efficient

Less corrosion of tubes

Low pressure drop

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Heat Transfer

Heat Transfer In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

Heat Transfer Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by

Heat Transfer For concentrating an aqueous solution of a material like anhydrous Na₂SO₄, whose solubility decreases with rise in temperature, the most suitable evaporator is a __________ evaporator.

Heat Transfer The overall resistance for heat transfer through a series of flat resistance, is the __________ of the resistances.

Heat Transfer In a shell and tube heat exchanger, floating head is used for

Heat Transfer
In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

Heat Transfer
Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by

Heat Transfer
For concentrating an aqueous solution of a material like anhydrous Na₂SO₄, whose solubility decreases with rise in temperature, the most suitable evaporator is a __________ evaporator.

Heat Transfer
The overall resistance for heat transfer through a series of flat resistance, is the __________ of the resistances.

Heat Transfer
In a shell and tube heat exchanger, floating head is used for