Category: Switchgear and Protection

A. required to operate the circuit breaker
B. absorbed by the circuit of relay
C. developed by the relay circuit
D. none of the above

A. 2
B. 4
C. 6
D. 10

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

A. the spring tension
B. the rate of flux built up
C. armature core air gap
D. all of the above

A. Radiation
B. Convection
C. Conduction
D. All of the above

A. negative circuit only
B. positive circuit only
C. both (A) and (B)
D. either (A) or (B)

A. 1 mega ohms
B. 10 mega ohms
C. 100 mega ohms
D. 500 mega ohms

A. Air blast circuit breakers
B. Circuit breaker with SF6 gas
C. Vacuum circuit breakers
D. Oil circuit breakers

A. connecting lines in parallel
B. connecting lines in series
E. using machines of high impedance
D. reducing the excitation of machines
E. none of the above

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