Exam Question
With respect to 2-stroke and 4-stroke Diesel engines, describe
(a) What are the advantages and disadvantages of 2-stroke and 4-stroke engines? (8)
(b) Uses of each type of engine on board ship with reasons (8)
Class 4 (4th Engineer)
MEKM
📅 Feb 2023
Reference Answer
### (a) Advantages and Disadvantages of 2-Stroke and 4-Stroke Engines
#### 1. Two-Stroke Crosshead Diesel Engines
**Advantages:**
* **Higher Power-to-Weight Ratio:** For a given cylinder dimension and rotational speed, a 2-stroke engine completes a power cycle in every revolution, compared to every two revolutions for a 4-stroke engine. This results in a significantly higher power output for the same engine weight and size, a key consideration in ship design. (As cited in retrieved context).
#### 1. Two-Stroke Crosshead Diesel Engines
**Advantages:**
* **Higher Power-to-Weight Ratio:** For a given cylinder dimension and rotational speed, a 2-stroke engine completes a power cycle in every revolution, compared to every two revolutions for a 4-stroke engine. This results in a significantly higher power output for the same engine weight and size, a key consideration in ship design. (As cited in retrieved context).
Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.
Prepare on Android — MeoMock on Google Play