Lesson  4


MICROWAVE OVEN REPAIR AND MAINTANENCE

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1. What is a microwave oven?
Answer: A microwave oven is an electric kitchen appliance used to cook or heat food by emitting microwave radiation.
It uses electromagnetic waves to heat food quickly and evenly.

2. What are the main parts of a microwave oven?
Answer:

  • Magnetron: Generates microwaves.

  • Waveguide: Directs the microwaves into the oven cavity.

  • Turntable: Rotates the food for even heating.

  • Control panel: Used to set time and power levels.

  • Door and safety latch: Prevents microwaves from escaping.

3. What are the common problems in a microwave oven?
Answer:

  • No power: Due to a blown fuse or faulty power cord.

  • Food not heating: Caused by a defective magnetron.

  • Turntable not rotating: Due to a faulty motor or drive coupling.

  • Sparking inside the oven: Caused by metal objects or food splatters.

  • Unusual noise: Due to a worn-out magnetron or fan motor.

4. What is the function of the magnetron in a microwave oven?
Answer: The magnetron generates microwave radiation that heats the food.
It converts electrical energy into microwave energy.

5. What is the purpose of the waveguide in a microwave oven?
Answer: The waveguide directs the microwaves from the magnetron to the food compartment.
It ensures the even distribution of microwaves.

6. What is the role of the turntable in a microwave oven?
Answer: The turntable rotates the food to ensure even cooking or heating.

7. How can you repair a microwave oven that is not heating food?
Answer:

  • Check the power supply and fuse.

  • Inspect the magnetron and replace it if faulty.

  • Test the high-voltage capacitor and diode.

  • Ensure the door switches are functioning properly.

8. What safety precautions should be taken while repairing a microwave oven?
Answer:

  • Disconnect the oven from the power supply before repairing.

  • Use insulated tools to prevent electric shock.

  • Wear rubber gloves and shoes.

  • Discharge the high-voltage capacitor before working on the oven.

  • Avoid touching the magnetron directly.

9. What is the function of the high-voltage capacitor in a microwave oven?
Answer: The high-voltage capacitor stores and releases electrical energy to power the magnetron.

10. What causes sparking inside a microwave oven?
Answer:

  • The presence of metal objects inside the oven.

  • Food splatters on the waveguide or cavity.

  • Damaged or worn-out waveguide cover.

  • Faulty high-voltage diode.

11. What is the role of the thermostat in a microwave oven?
Answer: The thermostat regulates the temperature and prevents overheating by cutting off the power if the temperature is too high.

12. What is the purpose of the door safety interlock in a microwave oven?
Answer: The door safety interlock prevents the microwave from operating when the door is open, ensuring safety.

13. What is the importance of regular maintenance of a microwave oven?
Answer:

  • Ensures safe and efficient operation.

  • Prevents sparking and electrical hazards.

  • Increases the lifespan of the appliance.

  • Improves heating performance.

14. How do you clean and maintain a microwave oven?
Answer:

  • Clean the interior and exterior regularly with a damp cloth.

  • Avoid using metal containers inside the oven.

  • Check and replace the door seals if damaged.

  • Remove food splatters immediately to prevent sparking.

15. What are the benefits of using a microwave oven?
Answer:

  • Cooks food quickly and evenly.

  • Preserves nutrients in food.

  • Convenient and easy to use.

  • Suitable for reheating and defrosting food.



TYPE BY : KRISHNA SAIKIA