Question 188Motor Plants - Assistant Engineer70% to pass
When an air started, four-stroke cycle diesel engine is being cranked over, the starting air is admitted to each cylinder during the beginning of its_______________.
AI Explanation
The correct answer is C) power stroke.
When an air-started, four-stroke cycle diesel engine is being cranked over, the starting air is admitted to each cylinder during the beginning of its power stroke. This is because the power stroke is the phase of the engine cycle where the piston is moving downward, and the combustion of the air-fuel mixture provides the force to turn the crankshaft and start the engine.
The other options are incorrect because the starting air would not be admitted during the intake, compression, or exhaust strokes, as those are not the optimal points in the engine cycle for starting the engine.
Related Questions
#186 Starting systems for large, direct reversing, main propulsion diesel engines are usually_______________.#187 In a direct cylinder admission air starting system, once the engine begins to fire, the air starting check valve illustrated, is closed by_______________. Illustration MO-0107 #189 In a medium-speed marine propulsion engine equipped with direct admission air starting valves, the cylinders without air starting valves fire first because the _______________. #190 An oil-operated, direct reversing mechanism on a large, low-speed, main propulsion diesel engine, can serve to_______________. #191 In order to reverse the rotation of a two-stroke cycle loop scavenged, direct reversing, propulsion diesel engine, the cam positions must be changed for the_______________.