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Heat Transfer

Heat Transfer
Grashhoff number is given by

gD2βΔtP²μ
gD2βΔtρ/μ²
gD³.β.Δtρ²/μ²
gD³βΔtP²/μ

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Heat Transfer
Boiling of milk in an open vessel is an example of __________ boiling.

Film
Saturated nucleate
Sub-cooled
None of these

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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

Decreases the outlet temperature of cooling medium
None of these
Increases the overall heat transfer coefficient
Decreases the pressure drop

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Heat Transfer
The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m². The flux, when the element temperature is increased to 1000°C for the same furnace temperature is

12.0 kW/m²
16.5 kW/m²
14.6 kW/m²
11.2 kW/m²

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Heat Transfer
One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to

Evaporate the water
To superheat the steam
Heat the water from 0°C to 100°C
Data insufficient, can

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Heat Transfer
Which of the following is not used as a medium for high temperature heating ?

mercury
dowtherm
None of the listed here
liquid metal

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