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

Equal for all the three

Cube

Sphere

Cylinder

Equal for all the three

Cube

Sphere

Cylinder

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Heat Transfer
The film thickness for laminar film condensation on vertical surface __________ from top to bottom.

Cummulatively decreases

And the surface conductance increase

Remains constant

Cummulatively increases

Cummulatively decreases

And the surface conductance increase

Remains constant

Cummulatively increases

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Heat Transfer
In an extended surface heat exchanger, fluid having lower co-efficient

Should not be used as it gives very high pressure drop

Flows outside the tubes

Can flow either inside or outside the tubes

Flows through the tube

Should not be used as it gives very high pressure drop

Flows outside the tubes

Can flow either inside or outside the tubes

Flows through the tube

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Heat Transfer
For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are

Linearly related

Different

Never different

Same

Linearly related

Different

Never different

Same

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Heat Transfer
Vacuum is generally maintained in the vapour space of an evaporator mainly to

Get economical temperature difference by using moderate pressure steam

Facilitate forward feeding in multiple effect evaporation

Concentrate heat sensitive materials

Achieve very high concentration of the final product

Get economical temperature difference by using moderate pressure steam

Facilitate forward feeding in multiple effect evaporation

Concentrate heat sensitive materials

Achieve very high concentration of the final product

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Heat Transfer
Graetz number is given by

kμ/mCp

mCp/kL

mCp/kμ

kL/mCp

kμ/mCp

mCp/kL

mCp/kμ

kL/mCp

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Heat Transfer

Heat Transfer The film thickness for laminar film condensation on vertical surface __________ from top to bottom.

Heat Transfer In an extended surface heat exchanger, fluid having lower co-efficient

Heat Transfer For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are

Heat Transfer Vacuum is generally maintained in the vapour space of an evaporator mainly to

Heat Transfer Graetz number is given by

Heat Transfer
The film thickness for laminar film condensation on vertical surface __________ from top to bottom.

Heat Transfer
In an extended surface heat exchanger, fluid having lower co-efficient

Heat Transfer
For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are

Heat Transfer
Vacuum is generally maintained in the vapour space of an evaporator mainly to

Heat Transfer
Graetz number is given by