Steam Engine, Power Generation and Efficiency

What is nuclear power plant used for?

In the past, diesel was a type of fuel that is used in running a train.

Modern railway engines use diesel instead of coal.

A diatomic ideal gas is used in a carnot engine as the working substance. If during the adiabatic expansion part of the cycle, the volume of the gas increases from $V$ to $32 \mathrm{V}$, the efficiency of the engine is,

In the past, what types of fuel were used in running of a train?

What are the different forms of Energy?

Fill in the blank with the word given below.

_____ is used to run steam engines.

Earlier, trains were powered by heat energy.