Top 250+ Solved Testing and Commissioning of Electrical Equipment’s MCQ Questions Answer
Q. A transmission line is protected by
a. inrush protection
b. distance protection
c. time graded and current graded over current protection
d. both (B) and (C)
Q. Large internal faults are protected by
a. merz price percentage differential protection
b. mho and ohm relays
c. horn gaps and temperature relays
d. earth fault and positive sequence relays
Q. Large internal faults are protected by
a. Merz price percentage differential protection
b. Mho and ohm relays
c. Horan gaps and temperature relays
d. Earth fault and positive sequence relays
Q. Which of the following is the least expensive protection for over current in lowvoltage system ?
a. Rewireable fuse
b. Isolator
c. Oil circuit breaker
d. Air break circuit breaker
Q. For the protection of power station buildings against direct strokes therequirements are
a. Interception
b. Interception and conduction
c. Interception, conduction and dissipation
d. Interception,conduction,dissipation and reflection
Q. The line insulation is............. the insulation level at the station equipment
a. Less than
b. Same as
c. More than
d. Not directly related with
Q. Short-circuit currents are due to
a. Single phase to ground faults
b. Phase to phase faults
c. Three phase faults
d. Any of these
Q. For which of the following protection from negative sequence current is provided?
a. Generators
b. Motors
c. Transmission line
d. Transformers
Q. For which of the following ratings of the transformer differential protection isrecommended?
a. Above 30 KVA
b. Equal to and above 5 MVA
c. Equal two and above 25 MVA
d. None of the above
Q. Over voltage protection is recommended for
a. Hydro electric generators
b. Steam turbine generators
c. Gasturbine generators
d. All of the above
Q. Overfluxing protection is recommended for
a. Distribution transformer
b. Generator transformer of the power plant
c. Auto transformer of the power plant
d. Station transformer of the power plant
Q. Hey switchgear is device used for
a. Interrupting an electrical circuit
b. Switching an electrical circuit
c. Reaching and controlling an electrical circuit
d. Switching, controlling and protecting the electrical circuit and equipment
Q. Switching over voltage arc are more hazardous than lighting surges in case of
a. Unbalanced systems
b. Low-voltages
c. 11 KV systems
d. EHV and UHV systems
Q. Least number of faults are generally reported for
a. Transmission lines
b. Cables
c. Switchgears
d. Transformers