Switchgear and Protection

A. good selectivity and reliability
B. economy and simplicity
C. high speed and selectivity
D. all of the above

A. two currents
B. two voltages
C. two or more similar electrical quantities
D. none of the above

A. current during abnormal condition
B. voltage during abnormal condition
C. constantly the electrical quantities which differ during normal and abnormal conditions
D. none of the above

A. maintain the arc
B. extinguish the arc
C. transmit large power
D. emit the ionizing electrons

A. recovery
B. surge
C. operating
D. arc
E. none of the above

A. merz price percentage differential protection
B. mho and ohm relays
C. horn gaps and temperature relays
D. earth fault and positive sequence relays

A. power
B. current
C. voltage wave
D. all of the above

A. over currents
B. short duty
C. intermittant duty
D. repeated duty

A. transient state of short-circuit current
B. sub-transient state of short-circuit current
C. steady state of short-circuit current
D. after D.C. component has ceased

A. few turns of thin wire
B. few turns of thick wire
C. many turns of thin wire
D. many turns of thick wire