Practice Miniature Circuit Breaker (mcb) (9.8.2) - Household Circuits

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9 questions

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6 sample questions

Question 1.
What does MCB stand for?
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Think about what the letters M, C, and B represent in terms of electrical devices.
Question 2.
How does an MCB differ from a fuse?
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Consider the mechanism behind each device.
3Question 3.
What does an MCB do when there's an overload?
- Traps the current
- Disconnects the circuit
- Makes a sound
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Connect this to its safety role!
4Question 4.
True or False: An MCB is resettable without needing to be replaced.
- True
- False
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Think about how you would reactivate it.
Question 5.
Design a household circuit incorporating an MCB. Include the appliances you would connect and their total power ratings, explaining your choice of MCB rating.
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Calculate total power and use P=VI for guidance.
Question 6.
An MCB rated at 25A trips frequently. Outline possible reasons, including suggestions for remedying the issues identified.
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Consider everyday household usage patterns.

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