NCCER Electrical Level 2 Module 10
Questions and Answers | Latest Version
| 2024/2025 | Correct & Verified
What is the primary function of a circuit breaker?
✔✔A circuit breaker is designed to protect an electrical circuit by interrupting the flow of
current in case of overload or short circuit, preventing damage to wires and devices.
How does a fuse differ from a circuit breaker?
✔✔A fuse melts and breaks the circuit when current exceeds a safe limit, whereas a circuit
breaker can be reset after tripping, making it reusable.
What causes a circuit breaker to trip?
✔✔A circuit breaker trips when there is an overload of current, a short circuit, or a ground fault,
ensuring the circuit is protected from damage.
Why should circuit breakers be installed according to their rated capacity?
✔✔Installing circuit breakers with the correct rated capacity ensures that the breaker will trip
during overload conditions, preventing overheating and potential fires.
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, What is the role of a fuse in a circuit?
✔✔A fuse protects the circuit by melting and disconnecting the circuit when the current exceeds
the fuse's rated limit, preventing further damage to the system.
How does a circuit breaker prevent electrical fires?
✔✔By automatically interrupting the circuit when excessive current is detected, preventing
overheating of the wires and reducing the risk of fire.
What are the common types of circuit breakers?
✔✔The most common types of circuit breakers are standard circuit breakers, ground fault circuit
interrupters (GFCIs), and arc fault circuit interrupters (AFCIs).
What is a ground fault circuit interrupter (GFCI) breaker designed to do?
✔✔A GFCI breaker detects differences between the hot and neutral wires, tripping the circuit if
it senses a leakage current to the ground, preventing electric shocks.
What is the purpose of an arc fault circuit interrupter (AFCI)?
✔✔An AFCI breaker detects dangerous arc faults in the circuit and trips to prevent electrical
fires caused by damaged or faulty wiring.
2
Questions and Answers | Latest Version
| 2024/2025 | Correct & Verified
What is the primary function of a circuit breaker?
✔✔A circuit breaker is designed to protect an electrical circuit by interrupting the flow of
current in case of overload or short circuit, preventing damage to wires and devices.
How does a fuse differ from a circuit breaker?
✔✔A fuse melts and breaks the circuit when current exceeds a safe limit, whereas a circuit
breaker can be reset after tripping, making it reusable.
What causes a circuit breaker to trip?
✔✔A circuit breaker trips when there is an overload of current, a short circuit, or a ground fault,
ensuring the circuit is protected from damage.
Why should circuit breakers be installed according to their rated capacity?
✔✔Installing circuit breakers with the correct rated capacity ensures that the breaker will trip
during overload conditions, preventing overheating and potential fires.
1
, What is the role of a fuse in a circuit?
✔✔A fuse protects the circuit by melting and disconnecting the circuit when the current exceeds
the fuse's rated limit, preventing further damage to the system.
How does a circuit breaker prevent electrical fires?
✔✔By automatically interrupting the circuit when excessive current is detected, preventing
overheating of the wires and reducing the risk of fire.
What are the common types of circuit breakers?
✔✔The most common types of circuit breakers are standard circuit breakers, ground fault circuit
interrupters (GFCIs), and arc fault circuit interrupters (AFCIs).
What is a ground fault circuit interrupter (GFCI) breaker designed to do?
✔✔A GFCI breaker detects differences between the hot and neutral wires, tripping the circuit if
it senses a leakage current to the ground, preventing electric shocks.
What is the purpose of an arc fault circuit interrupter (AFCI)?
✔✔An AFCI breaker detects dangerous arc faults in the circuit and trips to prevent electrical
fires caused by damaged or faulty wiring.
2
