

Inductors - Technical MCQs
Q1: A magnetic circuit breaker will open to protect equipment only when:A voltage is exceeded
B an open is in the equipment
C the equipment is operating properly
D current is exceeded
ANS:D - current is exceeded Magnetic circuit breakers use a solenoid (electromagnet) whose pulling force increases with the current. Certain designs utilize electromagnetic forces in addition to those of the solenoid. The circuit breaker contacts are held closed by a latch. As the current in the solenoid increases beyond the rating of the circuit breaker, the solenoid's pull releases the latch, which lets the contacts open by spring action. |


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