Which of the following heat flow situations pertains to free or natural convection?

Air conditioning installations and nuclear reactors

Flow of water inside the condenser tubes

Cooling of internal combustion engine

Cooling of billets in atmosphere

Mark the system where heat transfer is given by forced convection

Chilling effect of cold wind on warm body

Fluid passing through the tubes of a condenser and other heat exchange equipment

Heat flow from a hot pavement to surrounding atmosphere

Heat exchange on the outside of cold and warm pipes

Forced convection in a liquid bath is caused by

Intense stirring by an external agency

Density difference brought about by temperature gradients

Flow of electrons in a random fashion

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

Combined conduction and radiation

A body cooling from 80 degree Celsius to 70 degree Celsius takes 10 minutes when left exposed to environmental conditions. If the body is to cool further from 70 degree Celsius to 60 degree Celsius under the same external conditions, it will take

Time will depend upon the environmental conditions

On a summer day, a scooter rider feels more comfortable while on the move than while at a stop light because

An object in motion captures less radiation

Air has a low specific heat and hence it is cooler

More heat is loss by convection and radiation while in motion

Air is transparent to radiation and hence it is cooler than the body

A sphere, a cube and a thin circular plate, all made of the same material and having the same mass are initially heated to the temperature of 250 degree Celsius. When left in air at room temperature, what will be their response to cooling?

Cube will cool faster than sphere but slower than the circular plate

They will cool at the same rate

Circular plate will cool at the slower rate

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