The main purpose of the piston oil scraper rings is to （）.

Control of the main propulsion diesel engines can be shifted from the engine room to the wheelhouse from the （）.

For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.

In using reduction gears to obtain efficient propeller speeds, （）.

In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.

If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.

A diesel engine piston ring face is in direct contact with the （）.

A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.

Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.

Engine protection by means of an alarm or shutdown control can be obtained with devices that are sensitive to （）.