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ZIMSEC O-Level Combined Science

7.3.4.3Petrol and diesel engines

Petrol and diesel engines in ZIMSEC O-Level Combined Science: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic11 practice questions1 lesson
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Overview

Form 3.

Learning objectives

What the syllabus expects you to be able to do.

  1. 7.3.4.3.1Describe the operation of four-stroke petrol and diesel engines.
  2. 7.3.4.3.2Explain the roles of the carburettor and the fuel injector.
  3. 7.3.4.3.3Outline the advantages of modern petrol and diesel engines.

Lessons

  • The four-stroke engine

    28 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Petrol and diesel engines: sample question

1 mark

During the compression stroke of a petrol engine, which valves are open?

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