A. negative circuit only
B. positive circuit only
C. both (A) and (B)
D. either (A) or (B)
A. lengthening of the gap
B. cooling and blast effect
C. both (A) and (B)
D. deionizing the oil with forced air
E. none of the above
A. mechanical vibration
B. insulation failure
C. loose connection
D. impulse voltage
A. power frequencies
B. higher frequencies entering generator or transformer units
C. either of the above
D. none of the above
A. inversely proportional to the current
B. inversely proportional to the square of the current
C. proportional to the current
D. proportional to square of the current
A. above 30 kVA.
B. equal to and above 5 MVA
C. equal to and above 25 MVA
D. none of the above
A. 0.003 sec
B. 0.001 sec
C. 0.01 sec
D. 0.10 sec
E. none of the above