Quiz on Fuses and Circuit Breakers

What is the primary function of a fuse?

• To store electrical energy

• To increase current flow

• To protect against overloads and short circuits

• To amplify voltage

Which type of fuse is designed to be reusable?

• HRC fuse

• Semi-enclosed fuse

• Rewirable fuse

• Cartridge fuse

What does the rated current of a fuse indicate?

• The maximum voltage it can handle

• The current it can carry indefinitely without fusing

• The minimum current required to blow the fuse

• The time it takes to blow under overload

What is the purpose of a circuit breaker?

• To convert AC to DC

• To store energy for later use

• To isolate faulty parts of the power system

• To increase the voltage in a circuit

What is the arcing time in a circuit breaker?

• Time from opening of contacts to final arc extinction

• Time from fault inception to trip signal

• Time taken to detect a fault

• Time taken to close the contacts

Which type of circuit breaker uses SF6 as an insulating medium?

• Oil circuit breaker

• SF6 circuit breaker

• Vacuum circuit breaker

• Air-blast circuit breaker

What is the minimum fusing current?

• The maximum current rating of the fuse

• The current required to reset the fuse

• The current it can carry indefinitely

• The current that causes the fuse to melt

What is the main advantage of HRC fuses?

• They require frequent maintenance

• They are the cheapest option

• They can clear high fault currents quickly

• They are reusable

What is the typical relaying time for electromechanical relays?

• Less than one cycle

• One cycle to five cycles

• More than ten cycles

• Five to ten cycles

Which type of relay is faster than electromechanical relays?

• Digital relays

• Static relays

• Numerical relays

• Mechanical relays