Admittance relay is __________ relay?

A. impedance
B. directional
C. non-directional
D. none of the above

Air blast circuit breakers for 400 kV power system are designed to operate in_______________?

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

The fuse wire, in D.C. circuits, is inserted in____________?

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

A fuse is never inserted in____________?

A. neutral wire
B. negative of d.c. circuit
C. positive of d.c. circuit
D. phase dine

A switchgear is device used for_____________?

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

The information to the circuit breaker under fault conditions is provided by____________?

A. relay
B. rewirable fuse
C. h.r.c. only
D. all of the above

By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?

A. radiation
B. convection
C. conduction
D. all of the above

A balanced 3-phase system consists of_______________?

A. zero sequence currents only
B. positive sequence currents only
C. negative and zero sequence currents
D. zero, negative and positive sequence currents

A short-circuit is identified by_____________?

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

To limit short-circuit current in a power system are used______________?

A. earth wires
B. isolators
C. h.r.c. fuses
D. reactors