Lesson Notes By Weeks and Term - Senior Secondary 3

Fuel pump and exhaust systems II

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TERM – 2ND TERM

WEEK FOUR

Class: Senior Secondary School 3

Age: 17 years

Duration: 40 minutes of 5 periods each

Date:

Subject: AUTO MECHANICAL

Topic: FUEL PUMP AND EXHAUST SYSTEMS II

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

I.) Define exhaust system

II.) Identify the functions of the exhaust system

III.) Define muffler

IV.) Identify the functions of the exhaust system

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S

ACTIVITY

STEP 1

INTRODUCTION

The teacher explains the meaning of exhaust system and identify the functions of the exhaust system

Students listens attentively to the teacher                                                                          

STEP 2

EXPLANATION

Teacher describes a muffler and state it's functions.

Students exhibit attentiveness and active engagement

STEP 3

NOTE TAKING

The teacher writes a summarized

note on the board

The students

copy the note in

their books

 

NOTE

FUEL PUMP AND EXHAUST SYSTEMS II

Exhaust System

The exhaust system is a series of pipes, mufflers, catalytic converters, and other components that route exhaust gases away from the engine to the rear of the vehicle and expel them into the atmosphere.

Functions of the Exhaust System

  1. The primary function of the exhaust system is to remove harmful exhaust gases produced during the combustion process from the engine's cylinders.
  2. The exhaust system helps to reduce engine noise by directing exhaust gases through a series of chambers and baffles in the muffler.
  3. The exhaust system contains catalytic converters that help reduce harmful emissions by converting pollutants into less harmful substances before they are released into the environment.
  4. The exhaust system helps dissipate heat generated by the engine during combustion, preventing overheating of the engine and other nearby components.

Muffler

A muffler, also known as a silencer, is a component of the exhaust system designed to reduce the noise produced by the engine during the exhaust process.

Functions of the Muffler

  1. The primary function of the muffler is to reduce the noise produced by the engine as exhaust gases are expelled from the cylinders.
  2. Mufflers are designed with chambers, baffles, and sound-absorbing materials to tune the exhaust note, producing a more pleasing sound while minimizing noise levels.
  3. Mufflers also help regulate exhaust backpressure, which can affect engine performance and efficiency. Properly designed mufflers maintain optimal backpressure levels for efficient engine operation.
  4. Some mufflers contain additional components, such as resonators and catalytic converters, to further reduce harmful emissions before they are released into the atmosphere.

EVALUATION: 1. Define a muffler

  1. What is an exhaust system?
  2. Mention 3 functions of a muffler

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively