Switchgear protections

Induction type

Reactance

Impedance

None of the above

relay

rewirable fuse

H.R.'only

all of the above

Interrupting an electrical circuit

Switching an electrical circuit

Switching and controlling an electrical circuit

Switching, controlling and protecting the electrical circuit and equipment

above 30 kV

equal to and above 5 MVA

equal to and above 25 MVA

none of the above

Rewireable fuse

Isolator

Oil circuit breaker

Air break circuit breaker E. None of the above

transmission line

motor

generator

feeder

lubricate the contacts

insulate the contacts from switch body

extinguish the arc

all of the above E. none of the above

single bus

double bus, double breaker

main and transfer bus

all of the above

overload

short-circuit and overload

open circuit, short-circuit and overload

none of the above

Thermocouple

Electronic and bimetallic

Both (A) and (B)

None of the above