Circuit breakers are essentially____________?

Related Mcqs:

The main function of a fuse is to_____________?

A. protect the line B. open the circuit C. protect the appliance D. prevent excessive currents E. none of the above...

The current zero interruption, in oil and air blast circuit breakers, is achieved by_______________?

A. lengthening of the gap B. cooling and blast effect C. both A. and B D. deionizing the oil with forced air E. none of the above...

The time of closing the cycle, in modern circuit breakers is_____________?

A. 0.003 sec B. 0.001 sec C. 0.01 sec D. 0.10 sec E. none of the above...

The inverse definite mean time relays are used for over current and earth fault protection of transformer against_________________?

A. heavy loads B. internal short-circuits C. external short-circuits D. all of the above...

The steady state stability of the power system can be increased by_____________?

A. connecting lines in parallel B. connecting lines in series E. using machines of high impedance D. reducing the excitation of machines E. none of the above...