Top 250+ Solved Testing and Commissioning of Electrical Equipment’s MCQ Questions Answer
Q. Distance protection scheme is preferred over graded lime-lag over-current protection in HV and EHV lines because
a. It is faster in operation
b. It is simple
c. It is cheaper in cost
d. All of the above
Q. Requirements of protection power station buildings against direct strokes are
a. Interception
b. Conduction
c. . Dissipation
d. All of the above
Q. The protection against direct lighting strokes and a high-voltage steep waves isprovided by
a. Ground wires
b. Lightning arresters
c. Lightning arresters and ground wires
d. Earthing of neutral
Q. For protection of rotating machines against lightning surge .............is used
a. Lightning arrester
b. Capacitor
c. Combination of lightning arrester and a capacitor
d. Lightning conductor and arrester
Q. In between the generating station and consumers a number of transformation andswitching stations exist, these are called the
a. Switchgears
b. Substations
c. Intermediate substations
d. Transformation stations
Q. With large reactance interconnector between two power stations
a. The power stations may fall out of step due to large angular displacement between the power stations
b. Power will be transferred with minimum power losses
c. Power will be transferred with voltage fluctuations and noise
d. None of the above
Q. In a isolated neutral system, when a single line to ground fault occurs
a. Persistent arcing grounds will be developed
b. Voltage in the healthy phases rise to full line value causing isolation breakdown
c. The capacitive current in the faulty phase rises to 3 times its normal value
d. All of the above
Q. Tap changing transformers are employed for
a. Stepping down the voltage
b. Stepping up the voltage
c. Supplying low-voltage current to instruments
d. Both stepping up and stepping down the voltage
Q. Field failure in an alternator occurs due to
a. Failure of exciter
b. Faulty field circuit breaker
c. In rush of large currents
d. Both A and B