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WorksheetsMCB and Fuse
Total questions: 10
Worksheet time: 5mins
What does MCB stand for?
Main Current Box
Miniature Circuit Breaker
Manual Circuit Blocker
Multi Control Board
What is the main construction material of a fuse?
Plastic casing
Metal wire/strip
Copper busbar
Magnetic coil
Can an MCB be reused after tripping?
No, it must be replaced
Yes, it can be reset
Only once
Only if repaired
Name two common types of fuses.
Cartridge and Rewirable
Transformer and Resistor
Switch and Socket
Relay and Contactor
What protects an MCB against overload current?
Magnetic mechanism
Thermal mechanism
Semiconductor
Battery
Which protective device must always be replaced after it operates?
MCB
Relay
Fuse
Contactor
What is meant by the “tripping curve” of an MCB?
The lifespan of the MCB
The speed of tripping based on overcurrent
The shape of the breaker
The wiring diagram
Give one function of a fuse in protecting electrical equipment.
Provides current supply
Prevents overheating and fire hazards
Stores electrical energy
Increases current flow
What is one advantage of an MCB over a fuse?
Cheaper in cost
Resettable and reusable
Single-use only
Slower response
Which device is commonly used to protect sensitive semiconductor devices?
MCB
Normal fuse
Fast-acting fuse
Relay
