Heat Transfer Co-efficient in Natural Convection

Conduction plus fluid flow in motion is known as
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A finned tube hot water radiator with a fan blowing air over it is kept in rooms during winter. The major portion of the heat transfer from the radiation is due to
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Convection heat transfer coefficient depends upon.
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Which of the following is true about Convection?
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Forced convection happens when the fluid is kept in motion by an external means, such as a turbine or a fan.
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