STEAM BOILERS

Air preheater is used to preheat air with the help of ______

• Air

• Flue gases

• Water

• Steam

_______ is the transfer of heat within a fluid, that is a liquid or gas. It is caused by a mixing action within a fluid.

• Conduction

• Convection

• Radation

• Combustion

The following is the correct order of energy conversion in thermal power plants

• Chemical energy – Mechanical energy – Electrical energy

• Mechanical energy – Chemical energy – Electrical energy

• Wind energy – Mechanical energy – Electrical energy

• Heat energy – Electrical energy – Mechanical energy

In thermal power plant, turbine is placed

• before boiler

• in between boiler and generator

• after generator

• any of the above

In thermal power plants, the dust of flue gases is trapped by

• Precipitator

• Economizer

• Superheater

• Air preheater

The path of flue gases in Thermal power plant is

• Boiler – Economizer – Superheater– Air preheater

• Boiler – Superheater – Air preheater – Economizer

• Boiler – Air preheater – Superheater – Economizer

• Boiler – Superheater – Economizer – Air preheater

The following is not a component of Thermal power plant

• Condenser

• Cooling tower

• Turbine

• Fuel tank

For steam boilers, the fuel(s) is (are) mainly

• Bituminous coal

• Fuel oil

• Natural gas

• All of the above

The thermal efficiency of a steam power station is.......

• 38%

• 28%

• 40%

• 45%

The draught produced by the chimney if due to the ____ difference between the column of hot gases inside the chimney and the cold air outside.

• Temperature

• Potential

• Density

• None of the above