What are the two principle functions of the turbine nozzle guide vanes?

Correct Answer: Option A — Convert the heat energy of the hot gases into kinetic energy and direct the flow of gases to the turbine rotor blades.

Nozzle guide vanes serve two critical roles: they accelerate the gas flow by converting thermal energy into kinetic energy (velocity) and direct that flow at the precise angle required to strike the turbine rotor blades efficiently. This energy conversion is essential for extracting power from the hot combustion gases.