Question: 16. What does an MCB protect against? A. Fire and electric shock B. Mechanical damage C. Overload and short circuit D. Earth leakage 17. What

16. What does an MCB protect against? A. Fire and electric shock B. Mechanical damage C. Overload and short circuit D. Earth leakage 17. What is discrimination in circuit protection? A. Preventing nuisance tripping B. Allowing only the closest device to trip C. Balancing 3-phase loads D. Sizing the main fuse correctly 18. Which BS standard relates to MCBs? A. BS 1363 B. BS 5266 C. BS EN 60898 D. BS 3036 19. A ring final circuit is usually protected by a: A. 6 A MCB B. 32 A MCB C. 16 A RCBO D. 10 A fuse 20. Why is load balancing important in 3-phase systems? A. To increase current flow B. To reduce voltage C. To prevent overload on one phase D. To avoid power factor correction

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