Prior to starting, the purpose of turning over a main propulsion diesel engine with the cylinder test cocks open, is to __________.

Correct Answer: Option B — remove condensation and other liquids from the cylinders

Liquids such as unburned fuel, cooling water, or condensation do not compress. Rotating the diesel engine with test cocks open prevents hydraulic lock, catastrophic rod bending, or cylinder head fracturing under starting torque.