Correct option is D
Nuclear power plant: Nuclear power plants typically have low standby losses because they are designed to operate continuously at high capacity. They do not need to be frequently started or stopped, which minimizes standby losses.
Diesel power plant: Diesel power plants can have significant standby losses because they often need to be kept running to be ready for immediate operation. Fuel consumption during standby periods contributes to energy losses.
Steam power plant: Steam power plants, especially traditional fossil fuel-fired ones, may have moderate standby losses due to the need to maintain boiler pressure and temperature during standby periods.
Hydro power plant: Hydro power plants typically have very low standby losses because they can quickly adjust their output to match demand. They do not need to maintain continuous combustion or heat as in thermal power plants.
Given these considerations:
Option (d) Hydro power plant yields no or very minimal standby loss due to its ability to start and stop quickly without significant energy consumption during standby periods.
Therefore, the correct answer is:
(d) Hydro power plant
