CIRCUIT BREAKERS AND RELAYS - Quiz

1) What is the defect in an air circuit breaker, if trips intermittently on loading?

Incorrect setting of relay Excessive heat Insufficient air pressure Line voltage is too high

2) What is the defect in a oil circuit breaker if the oil heats up excessively

Line voltage is too high Excessive load Poor dielectric strength Defective tripping mechanism

3) What is the cause for the defect if phase to ground fault on the transmission line?

Components failure Insulation failure Human error Fuse failure