A. power frequencies
B. higher frequencies entering generator or transformer units
C. either of the above
D. none of the above
A. 33kVto66kV
B. HkVto33kV
C. 3.3kVandllkV
D. none of the above
A. 2
B. 4
C. 6
D. 10
A. arc suppressing blow out coils
B. wide separation of the opened contacts
C. high speed opening of contacts
D. all of the above
A. in phase with the arc current
B. lagging the arc current by 90″
C. leading the arc current by 90°
D. none of the above
A. slow making and breaking of load circuit contacts
B. foreign matter on the contact surface
C. too low contact pressure
D. all of the above
A. short transmission line
B. medium transmission line
C. long transmission line
D. medium and long transmission lines
A. high temperature
B. increase of mean free path
C. increasing field strength
D. all of the above
A. inrush protection
B. distance protection
C. time graded and current graded over current protection
D. both (B) and (C)
E. none of the above
A. current wave only
B. voltage wave only
C. Both (A) and (B)
D. power factor wave only