Exam Question
(a) In a 4-Stroke engine, describe each of the four strokes of the engine. (5)
(b) Draw timing diagram of complete cycle. (5)
(c) How each stroke is completed, in the engine with action of crank travel and valves (6)
Class 4 (4th Engineer)
MEKM
📅 May 2023
Reference Answer
### (a) Description of the Four Strokes of a 4-Stroke Engine
A 4-stroke engine completes one power cycle in four strokes of the piston, which corresponds to two complete revolutions of the crankshaft (720°). The four strokes are as follows:
1. **Intake (or Suction) Stroke:**
* **Piston Movement:** The piston travels from Top Dead Centre (TDC) to Bottom Dead Centre (BDC).
A 4-stroke engine completes one power cycle in four strokes of the piston, which corresponds to two complete revolutions of the crankshaft (720°). The four strokes are as follows:
1. **Intake (or Suction) Stroke:**
* **Piston Movement:** The piston travels from Top Dead Centre (TDC) to Bottom Dead Centre (BDC).
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