**Lesson Plan: Auto Mechanical - Carburetor and Air Cleaner/Filter II**
**Grade Level:** Senior Secondary 2
**Subject:** Auto Mechanical
**Topic:** Carburetor and Air Cleaner/Filter II
**Duration:** 2 hours (120 minutes)
### Objectives:
By the end of this lesson, students will be able to:
1. Explain the function and importance of a carburetor in an internal combustion engine.
2. Identify the components of a carburetor and explain their roles.
3. Explain the importance and functioning of air cleaners/filters in automotive engines.
4. Perform basic maintenance and troubleshooting on carburetors and air filters.
### Materials Needed:
- Diagram of a carburetor and an air cleaner/filter
- Actual carburetor and air cleaner/filter for demonstration
- Screwdrivers, wrenches, and other basic tools
- Cleaning materials (like carburetor cleaner)
- Gloves and safety goggles
- Handouts with key concepts and diagrams
- Multimedia projector (for videos and presentations)
- Sample reading materials on carburetors and air filters
### Lesson Plan:
#### 1. Introduction (15 minutes)
- **Greet the Students:** Welcome them to the class.
- **Review Previous Lesson:** Briefly go over Carburetor and Air Cleaner/Filter I and any key points from the previous class.
- **State Objectives:** Clearly explain what students will learn during the class.
#### 2. Lecture and Discussion (35 minutes)
- **Introduction to Carburetors:** Explain the basic function of a carburetor in an internal combustion engine (i.e., mixing air and fuel in the correct ratio for combustion).
- Key components: float chamber, venturi, throttle valve, choke.
- Types of carburetors: single-barrel, dual-barrel, and four-barrel.
- **Functional Parts:** Discuss how each component works:
- Float Chamber: Maintains a constant level of fuel.
- Venturi: Creates a pressure drop that draws fuel into the air stream.
- Throttle Valve: Controls the amount of fuel-air mixture entering the engine.
- Choke: Enriches the fuel-air mixture for starting a cold engine.
- **Introduction to Air Cleaners/Filters:** Explain their role in preventing dirt, debris, and other contaminants from entering the engine.
- Types: Paper, foam, and cotton filters.
- Importance: Prolongs engine life and maintains performance.
#### 3. Demonstration (30 minutes)
- **Carburetor Walkthrough:** Demonstrate how to take apart a carburetor, identify parts, and assemble it back.
- **Air Cleaner/Filter Demonstration:** Show different types of air filters and demonstrate how to inspect and replace them.
- **Safety First:** Emphasize the importance of safety measures such as wearing gloves and goggles.
#### 4. Hands-On Activity (20 minutes)
- **Student Practice:** Divide students into small groups and provide each group with a carburetor and an air filter.
- Guide them through disassembling and reassembling the carburetor.
- Have them inspect, clean (if necessary), and reinstall air filters.
- **Instructor Support:** Circulate among groups to provide guidance and answer questions.
#### 5. Video Presentation (10 minutes)
- **Supplemental Learning:** Show an educational video on carburetor and air filter maintenance to reinforce concepts.
- **Discussion:** Have a short discussion about what was learned from the video and how it applies to their practical work.
#### 6. Review and Assessment (10 minutes)
- **Recap Key Points:** Summarize the main points of the lesson.
- **Q&A:** Allow students to ask questions and clarify any doubts.
- **Quiz/Worksheet:** Distribute a short quiz or worksheet to assess students' understanding.
#### 7. Closing (5 minutes)
- **Homework Assignment:** Assign reading on advanced carburetor systems or maintenance procedures.
- **Preview Next Lesson:** Briefly describe what the next lesson will cover to prepare students.
- **Encourage Practice:** Encourage students to practice on their own or during free time in the lab.
**Assessment Methods:**
- Participation in hands-on activities
- Performance in the quiz/worksheet
- Engagement in discussions and demonstrations
**Note:** Always ensure safety protocols are strictly followed during hands-on activities. Provide guidance and supervision as students perform mechanical tasks.