Protective relays are devices that detect abnormal conditions in electrical circuits by measuring_____________?

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 relay operating speed depends upon_________________?

A. the spring tension B. the rate of flux built up C. armature core air gap D. all 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...

Air blast circuit breakers for 400 kV power system are designed to operate in_______________?

A. 100 microsecond B. 50 millisecond C. 0.5 sec D. 0.1 sec...

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...