A. single bus
B. double bus, double breaker
C. main and transfer bus
D. all of the above
A. burning
B. arcing
C. melting
D. none of the above
A. Air blast circuit breakers
B. Circuit breaker with SF6 gas
C. Vacuum circuit breakers
D. Oil circuit breakers
A. zero sequence currents only
B. positive sequence currents only
C. negative and zero sequence currents
D. zero, negative and positive sequence currents
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. interception
B. interception and conduction
C. interception, conduction and dissipation
D. interception, conduction, dissipation and reflection
E. none of the above
A. 100 microsecond
B. 50 millisecond
C. 0.5 sec
D. 0.1 sec