The efficiency of coal-fired thermal power plants may be improved by

The correct answer is option 4):(increasing pressure of the steam)

Concept

•  A thermal power plant is a plant where electricity is generated and the power plant whose efficiency is better to have more power generation.
• The efficiency of the power plant mainly depends upon the pressure and temperature of the steam entering the turbine and the pressure in the condenser.
• Under conditions of constant condenser pressure, the increase in steam enthalpy causes an increase in turbine power. So overall the increase in steam pressure on turbines will result in improved efficiency of the whole energy conversion system.
• Hence The efficiency of coal-fired thermal power plants may be improved by the increasing pressure of the steam