A. Induction type
B. Reactance
C. Impedance
D. None of the above
A. overload
B. short-circuit and overload
C. open circuit, short-circuit and overload
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. distribution transformer
B. generator transformer of the power plant
C. auto-transformer of the power plant
D. station transformer of the power plant
A. over currents
B. short duty
C. intermittant duty
D. repeated duty
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