Top 250+ Solved Testing and Commissioning of Electrical Equipment’s MCQ Questions Answer
Q. For the protection of power station buildings against direct strokes the requirementsare
a. interception
b. interception and conduction
c. interception, conduction and dissipation
d. interception, conduction, dissipation and reflection
Q. The interaction between a transmission line and communication line is minimized by
a. transposing transmission as well as communication lines
b. increasing the height of the trans-mission line tower
c. increasing the distance between the two lines
d. all of the above
Q. When a wave propagates on a transmission line, it suffers reflection several times at
a. tapping
b. load end
c. sending end
d. sending and other end
Q. Which of the following statements is incorrect?
a. Station batteries are used to operate relay only
b. The lightning arresters are basically surge diverters
c. An impedance relay has maximum fault current when fault occurs near the relay
d. A high speed relay has an operation of 1 to 2 cycles
Q. Discrimination between main and back up protection is provided by the use ofrelays which are
a. fact
b. sensitive
c. slow
d. none of the above
Q. Induction cup relay is operated due to changes in
a. current
b. voltage
c. impedance
d. all of the above
Q. A.C. network analyser is used to solve problems of
a. load flow
b. load flow and short-circuit
c. load flow and stability
d. load flow, short-circuit and stability
Q. To reduce short circuit fault currents are used.
a. reactors
b. resistors
c. capacitors
d. none of the above
Q. Bus coupler is very essential in arrangement
a. single bus
b. double bus, double breaker
c. main and transfer bus
d. all of the above
Q. For cost and safety, the outdoor substations are installed for voltages above
a. 11 kV
b. 33 kV
c. 60kV
d. 110kV
Q. The short circuit in any winding of the transformer is the result of
a. mechanical vibration
b. insulation failure
c. loose connection
d. impulse voltage
Q. relays are used for phase faults on long line.
a. Impedance
b. Reactance
c. Either of the above
d. None of the above
Q. For which of the following protection from negative sequence currents is provided ?
a. Generators
b. Motors
c. Transmission line
d. Transformers
Q. relay is preferred for phase fault on short transmission line.
a. Induction type
b. Reactance
c. Impedance
d. None of the above
Q. Distance relays are generally
a. split-phase relays
b. reactance relays
c. impedance relays
d. none of the above