In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will

Heat Transfer
In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will

Decrease

Increase

Remain unchanged

Either increase or decrease; depends on the coolant flow rate

Decrease

Increase

Remain unchanged

Either increase or decrease; depends on the coolant flow rate

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Heat Transfer
Nusselt number is the ratio of the

Temperature difference to the temperature gradient at the wall

Temperature gradient of the wall to that across the entire pipe

None of these

Heat flux at the wall to that across the entire pipe

Temperature difference to the temperature gradient at the wall

Temperature gradient of the wall to that across the entire pipe

None of these

Heat flux at the wall to that across the entire pipe

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Heat Transfer
For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.

Extremely low

No

Low

High

Extremely low

No

Low

High

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Heat Transfer
The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature)

√(ΔT)

(ΔT)⁴

(ΔT)³

(ΔT)²

√(ΔT)

(ΔT)⁴

(ΔT)³

(ΔT)²

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Heat Transfer
Thermal conductivities of most of the liquids __________ with rise in temperature.

Remains unchanged

Increases

Decreases

May increase or decrease; depends on the liquid

Remains unchanged

Increases

Decreases

May increase or decrease; depends on the liquid

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Heat Transfer
A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.

>10

Either B or C, depends on the mass of the body

10

>10

Either B or C, depends on the mass of the body

10

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Heat Transfer

Heat Transfer In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will

Heat Transfer Nusselt number is the ratio of the

Heat Transfer For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.

Heat Transfer The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature)

Heat Transfer Thermal conductivities of most of the liquids __________ with rise in temperature.

Heat Transfer A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.

Heat Transfer
In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will

Heat Transfer
Nusselt number is the ratio of the

Heat Transfer
For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.

Heat Transfer
The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature)

Heat Transfer
Thermal conductivities of most of the liquids __________ with rise in temperature.

Heat Transfer
A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.