Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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On the suction stroke of a four-stroke cycle diesel engine, what is drawn into the cylinder?

Fuel and air
Oil only
Air only
Exhaust gases

The correct answer is: Air only

During the suction stroke of a four-stroke cycle diesel engine, the piston moves down in the cylinder, creating a vacuum that draws in air from the surroundings. This process is crucial because diesel engines rely on compressing air to a high temperature before injecting fuel. Thus, during this stroke, only air is drawn into the cylinder, as diesel engines operate on a principle that differs from gasoline engines, which mix fuel and air before compression. The high compression of air in the cylinder raises its temperature, allowing the atomized diesel fuel to ignite when injected. Therefore, the correct option highlights that only air is involved during the suction stroke in this type of engine.