ICIT:Quiz on Overview of Protective Devices

What is the primary function of a fuse?

• To convert AC to DC

• To increase current flow

• To store electrical energy

• To melt and break the circuit under overload

Which part of a fuse is designed to melt when the fuse operates?

• Fuse carrier

• Fuse base

• Fuse element

• Fuse link

What type of fuse is designed to protect against heavy overloads?

• High Rupturing Capacity (HRC) fuse

• Cartridge fuse

• Rewirable fuse

• Glass fuse

What does the fusing factor indicate?

• The maximum current a fuse can carry

• The type of material used in the fuse

• The speed of operation under fault conditions

• The physical size of the fuse

What is the function of an excess current circuit breaker?

• To increase voltage in the circuit

• To automatically interrupt the circuit under excess current

• To provide a constant current

• To store energy for later use

Which type of circuit breaker is used as an alternative to fuses?

• Miniature Circuit Breaker (MCB)

• High Rupturing Capacity Fuse

• Residual Current Breaker

• Rewirable Fuse

What is the purpose of thermal tripping in an MCB?

• To trip the circuit instantly

• To provide overload protection over time

• To increase the current rating

• To reduce the size of the circuit breaker

What does an RCBO combine?

• MCB and RCD

• Fuse and circuit breaker

• HBC fuse and MCB

• Fuse and transformer

What is a disadvantage of circuit breakers?

• They have no moving parts

• They are less reliable than fuses

• They are cheaper than fuses

• They need regular testing to ensure operation

What is the nominal current rating of an MCB?

• The average current in the circuit

• The current at which it will trip instantly

• The minimum current it can carry

• The maximum current it can carry continuously