Steam passing through a multistage impulse turbine does not impart any appreciable axial thrust to the rotor. This is primarily due to the __________.

Correct Answer: Option C — equalizing holes provided in the turbine wheel

Equalizing holes drilled through the turbine wheels allow high-pressure steam to communicate between front and rear faces of the wheel, balancing static pressure differentials. This prevents excessive axial thrust forces on the rotor assembly in compliance with marine engineering standards under 46 CFR Subchapter F.