A. high impedance

C. low impedance

D. high resistance

A. none of the above

B. lubricate the contacts

D. insulate the contacts from switch body

E. all of the above

A. in parallel with circuit

B. none of the above

C. either in series or in parallel with circuit

B. no current flow

C. voltage drop

D. voltage rise

B. instantaneous trip action

C. both of the above

D. none of the above

A. overload

B. reverse current

D. open-circuits

B. all of the above

C. double bus, double breaker

D. single bus

A. grounds

C. all of the above

D. short-circuits

B. 110kV

C. 60kV

D. 11 kV

A. none of the above

B. connecting lines in series

D. using machines of high impedance

E. reducing the excitation of machines

A. low currents circuits

B. all circuits

C. low voltages circuits

A. 20 A

C. 50 A

D. 200 A

A. infinity

B. none of the above

C. zero

B. 500 mega ohms

C. 1 mega ohms

D. 10 mega ohms

B. The peak short current is (1.8 xV2) times the A.C. component

C. Shunt reactors are used as compensation reactors

D. The MVA at fault is equal to base MVA divided by per unit equivalent fault reactance

A. mechanical vibration

B. loose connection

D. insulation failure

A. transposition of the power line

B. transposition of the communication line

D. increasing the distance between the conductors

A. none of the above

B. above 30 kVA.

D. equal to and above 25 MVA

A. Vacuum circuit breakers

B. Air blast circuit breakers

D. Oil circuit breakers

B. none of the above

C. load flow

D. load flow and short-circuit

E. load flow and stability

A. none of the above

B. capacitors

C. resistors

A. Relays

B. Switchgear

C. Step-down transformer

A. impedance

B. voltage

C. current

A. split-phase relays

C. reactance relays

D. impedance relays

A. loose connection

B. mechanical vibration

C. insulation failure

B. a resistance increasing with voltage rise across the arc

C. an inductive reactance

D. a capackive reactance

B. Oil circuit breakers

C. Air blast circuit breakers

D. Minimum oil circuit breakers

A. sub-transient state of short-circuit current

B. after D.C. component has ceased

C. steady state of short-circuit current

A. circuits to break the system

C. any of the above

D. transformers to isolate the two systems

E. arc extinguishers

A. three phase faults

B. single phase to ground faults

C. two phase to ground faults

D. phase to phase faults

A. all of the above

C. rewirable fuse

D. H.R.C. only

A. fluorescent lamps

C. light circuits

D. power outlet circuits

A. overload

B. open circuit, short-circuit and overload

C. none of the above

A. none of the above

C. gas turbine generators

D. steam turbine generators

E. hydro-electric generators

A. over currents

B. short duty

C. intermittant duty

A. voltage

B. kVA

C. VAR

B. None of the above

C. Induction type

D. Impedance

A. Reactance

C. None of the above

D. Either of the above

A. zero, negative and positive sequence currents

B. zero sequence currents only

D. negative and zero sequence currents

B. station transformer of the power plant

C. distribution transformer

D. auto-transformer of the power plant

A. phase dine

C. positive of D.C. circuit

D. negative of D.C. circuit

A. wide separation of the opened contacts

C. high speed opening of contacts

D. arc suppressing blow out coils

A. none of the above

B. 5 to 20 sec

D. 1.5 sec

E. 20 to 30 sec

B. None of the above

C. Long

D. Short-circuit

B. foreign matter on the contact surface

C. slow making and breaking of load circuit contacts

D. too low contact pressure

B. none of the above

C. surge

D. arc

E. operating

A. delayed

C. both of the above

D. none of the above

A. negative circuit only

B. positive circuit only

D. either (A) or (B)

A. earth fault and positive sequence relays

B. horn gaps and temperature relays

C. mho and ohm relays

A. low melting point and any specific resistance

B. low melting point and -low specific resistance

D. high melting point and low specific resistance