Class 4 (4th Engineer) MEKM 📅 Mar 2024

Exam Question

(a) In a 4-Stroke engine, describe each of the different strokes of the cycle. (6)

(b) Draw 4-Stroke timing diagram describing the complete cycle. Explain how each stroke is completed with action of crank travel and the inlet-exhaust valves. (10)

Reference Answer

### (a) Description of Each Stroke in a 4-Stroke Engine
A 4-stroke internal combustion engine completes one full working cycle every two revolutions of the crankshaft, meaning four distinct piston strokes are required for each power event. These strokes are: Suction (Intake), Compression, Power (Expansion), and Exhaust.
1. **Suction (Intake) Stroke:**
* **Piston Movement:** The piston moves downwards from Top Dead Centre (TDC) to Bottom Dead Centre (BDC).

Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.

View plans Browse library

← Browse more questions

Prepare on Android — MeoMock on Google Play