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
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

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

Decreases the outlet temperature of cooling medium

None of these

Decreases the pressure drop

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Heat Transfer
Presence of a non-condensing gas in a condensing vapour

decreases thermal resistance

is desirable to increase the film co-efficient

increases the rate of condensation

None of the listed here

decreases thermal resistance

is desirable to increase the film co-efficient

increases the rate of condensation

None of the listed here

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Heat Transfer
With increase in temperature, the thermal conductivity of steel

Decreases

Increases exponentially

Remains unchanged

Increases

Decreases

Increases exponentially

Remains unchanged

Increases

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Heat Transfer
The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoffs law.

Wavelength of radiation

Nature of the body

None of these

Temperature of the body

Wavelength of radiation

Nature of the body

None of these

Temperature of the body

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Heat Transfer
A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions ? Assume that the conductive heat transfer co-efficient is infinitely large.

40 minutes

10 minutes

20 minutes

5 minutes

40 minutes

10 minutes

20 minutes

5 minutes

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Heat Transfer
The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are

Nu, Gz

Re.Gz

Nu, Pr

Nu, Pr, Re

Nu, Gz

Re.Gz

Nu, Pr

Nu, Pr, Re

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Heat Transfer

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 Presence of a non-condensing gas in a condensing vapour

Heat Transfer With increase in temperature, the thermal conductivity of steel

Heat Transfer The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoffs law.

Heat Transfer The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are

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
Presence of a non-condensing gas in a condensing vapour

Heat Transfer
With increase in temperature, the thermal conductivity of steel

Heat Transfer
The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoffs law.

Heat Transfer
The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are