Question 1 of 10
What is the primary function of a circuit breaker?
Circuit breakers are designed to protect electrical circuits from overcurrent and short-circuit conditions.
Question 2 of 10
Which component in a circuit breaker provides thermal protection against overloads?
The bimetallic strip bends when heated by excessive current due to an overload, triggering the breaker to trip.
Question 3 of 10
What triggers the magnetic trip mechanism in a circuit breaker?
The electromagnetic coil detects short circuits by sensing the high current and generating a strong magnetic field.
Question 4 of 10
What is the purpose of the contacts in a circuit breaker?
Contacts open to interrupt the current flow during a fault and close to allow normal operation.
Question 5 of 10
What type of fault does the bimetallic strip protect against?
The bimetallic strip responds to the heat generated by excessive current, which is a characteristic of overloads.
Question 6 of 10
What type of fault does the electromagnetic coil protect against?
The electromagnetic coil trips the breaker instantly in response to a short circuit (very high current).
Question 7 of 10
After a circuit breaker trips due to a fault, what must be done to restore power?
Circuit breakers must be manually reset after the cause of the fault is resolved.
Question 8 of 10
What does the operating lever/switch on a circuit breaker indicate?
The operating lever shows if the breaker is on, off, or has tripped due to a fault.
Question 9 of 10
Compared to fuses, what is a key advantage of circuit breakers?
Circuit breakers provide both overload and short-circuit protection, offering superior protection compared to fuses.
Question 10 of 10
Which of the following components helps the breaker open the contacts quickly during a fault?
The latch & spring system releases the internal mechanism, ensuring a rapid opening of the contacts to interrupt the fault current.
1 / 10
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