Category: Switchgear and Protection

A. single phase to ground faults
B. phase to phase faults
C. two phase to ground faults
D. three phase faults
E. any of these

A. mechanical vibration
B. insulation failure
C. loose connection
D. impulse voltage

A. current
B. voltage
C. impedance
D. all of the above

A. current carrying contacts called electrodes
B. arc extinguishers
C. circuits to break the system
D. transformers to isolate the two systems
E. any of the above

A. Oil circuit breakers
B. Air blast circuit breakers
C. Minimum oil circuit breakers
D. All of the above

A. lubricate the contacts
B. insulate the contacts from switch body
C. extinguish the arc
D. all of the above
E. none of the above

A. no ageing effect
B. high speed of operation
C. high rupturing capacity
D. all of the above

A. interrupting an electrical circuit
B. switching an electrical circuit 111.
C. switching and controlling an electrical circuit
D. switching, controlling and protecting the electrical circuit and equipment

A. no current flow
B. heavy current flow
C. voltage drop
D. voltage rise

A. single phase motors only
B. two phase motors only
C. two single phase motors running in parallel
D. three phase motors