Category: Switchgear and Protection

A. thermocouple
B. pyrometer
C. resistance thermometer
D. thermometer

A. Lightning arresters
B. Relays
C. Step-down transformer
D. Switchgear

A. short-circuit
B. temperature
C. overload
D. over voltage

A. hydro-electric generators
B. steam turbine generators
C. gas turbine generators
D. all of the above
E. none of the above

A. 100 microsecond
B. 50 millisecond
C. 0.5 sec
D. 0.1 sec

A. transient state of short-circuit current
B. sub-transient state of short-circuit current
C. steady state of short-circuit current
D. after D.C. component has ceased

A. burning
B. arcing
C. melting
D. none of the above

A. delayed
B. instantaneous
C. both of the above
D. none of the above

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. a capackive reactance
B. an inductive reactance
C. a resistance increasing with voltage rise across the arc
D. a resistance decreasing with voltage rise across the arc