Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for

Heat Transfer
Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for

Cube

Cylinder

Equal for all the three

Sphere

Cube

Cylinder

Equal for all the three

Sphere

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Heat Transfer
Leidenfrost point is a term concerned with the

Condensation of the saturated vapor on a cold surface

Concentration of a corrosive solution by evaporation

Boiling of a liquid on a hot surface

Heat transfer between two highly viscous liquids

Condensation of the saturated vapor on a cold surface

Concentration of a corrosive solution by evaporation

Boiling of a liquid on a hot surface

Heat transfer between two highly viscous liquids

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Heat Transfer
The advantage of using a 1 - 2 shell and tube heat exchanger over a 1 - 1 shell and tube heat exchanger is

Lower tube side pressure drop

Higher shell side heat transfer co-efficient

Higher tube side heat transfer co-efficient

Lower shell side pressure drop

Lower tube side pressure drop

Higher shell side heat transfer co-efficient

Higher tube side heat transfer co-efficient

Lower shell side pressure drop

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Heat Transfer
A dephlegmator is a

Vacuum evaporator

Total condenser

Partial condenser

Double pipe heat exchanger

Vacuum evaporator

Total condenser

Partial condenser

Double pipe heat exchanger

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Heat Transfer
The purpose of floating head in a heat exchanger is to

Decrease the pressure drop

Facilitate its lengthening, if needed

Provide support for tubes

Avoid buckling of tubes

Decrease the pressure drop

Facilitate its lengthening, if needed

Provide support for tubes

Avoid buckling of tubes

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Heat Transfer
The energy radiated from a surface Q at absolute temperature T is related as

Q ∝ T²

Q ∝ T³

Q ∝ T⁴

None of these

Q ∝ T²

Q ∝ T³

Q ∝ T⁴

None of these

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Heat Transfer

Heat Transfer Leidenfrost point is a term concerned with the

Heat Transfer The advantage of using a 1 - 2 shell and tube heat exchanger over a 1 - 1 shell and tube heat exchanger is

Heat Transfer A dephlegmator is a

Heat Transfer The purpose of floating head in a heat exchanger is to

Heat Transfer The energy radiated from a surface Q at absolute temperature T is related as

Heat Transfer
Leidenfrost point is a term concerned with the

Heat Transfer
The advantage of using a 1 - 2 shell and tube heat exchanger over a 1 - 1 shell and tube heat exchanger is

Heat Transfer
A dephlegmator is a

Heat Transfer
The purpose of floating head in a heat exchanger is to

Heat Transfer
The energy radiated from a surface Q at absolute temperature T is related as