Exam Question
(a) In a 4-Stroke engine, deseribe each of the four strokes of the engine. (5)
(b) Draw timing diagram of a complete cycle. (5)
(c) How each stroke is completed, in the engine with action of crank travel and valves. (5)
Class 4 (4th Engineer)
MEKM
📅 Sep 2024
Reference Answer
### (a) Description of the Four Strokes of an Engine
A four-stroke cycle engine completes its operating cycle in four distinct piston strokes, which corresponds to two full revolutions of the crankshaft (720°). The strokes are as follows:
1. **Suction (Intake) Stroke:**
* **Piston Movement:** The piston travels from the Top Dead Center (TDC) to the Bottom Dead Center (BDC).
A four-stroke cycle engine completes its operating cycle in four distinct piston strokes, which corresponds to two full revolutions of the crankshaft (720°). The strokes are as follows:
1. **Suction (Intake) Stroke:**
* **Piston Movement:** The piston travels from the Top Dead Center (TDC) to the Bottom Dead Center (BDC).
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