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

A. constant for all distances
B. lower than that of if fault occurs away from the relay
C. higher than that of if fault occurs away from the relay
D. none of the above

A. current wave only
B. voltage wave only
C. Both (A) and (B)
D. power factor wave only

A. Induction type
B. Reactance
C. Impedance
D. None of the above

A. current carrying contacts called electrodes
B. arc extinguishers
C. circuits to break the system
D. transformers to isolate the two systems
E. any of the above

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

A. delayed trip action
B. instantaneous trip action
C. both of the above
D. none of the above