Top 150+ Solved Switch Gear and Protection MCQ Questions Answer
Q. transmission line has reflection coefficient as one.
a. Open circuit
b. Short-circuit
c. Long
d. None of the above
Q. What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?
a. Zero
b. Unity
c. Infinity
d. None of the above
Q. The inverse definite mean time relays are used for over current and earth fault protection of transformer against
a. heavy loads
b. internal short-circuits
c. external short-circuits
d. all of the above
Q. Over voltage protection is recommended for
a. hydro-electric generators
b. steam turbine generators
c. gas turbine generators
d. all of the above
Q. Air blast circuit breakers for 400 kV power system are designed tooperate in
a. 100 microsecond
b. 50 millisecond
c. 0.5 sec
d. 0.1 sec
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 tr
Q. Series capacitors are used to
a. compensate for line inductive reactance
b. compensate for line capacitive reactance
c. improve line voltage
d. none of the above
Q. Admittance relay is _______ relay.
a. impedance
b. directional
c. non-directional
d. none of the above
Q. The material used for fuse must have
a. low melting point and high specific resistance
b. low melting point and -low specific resistance
c. high melting point and low specific resistance
d. low melting point and any specific resistance
Q. If the fault occurs near the impedance relay, the VII ratio will be
a. constant for all distances
b. lower than that of if fault occurs away from the relay
c. higher than that of if fault occurs away from the relay
d. none of the above
Q. The torque produced in induction type relay (shaded pole structure) is
a. inversely proportional to the current
b. inversely proportional to the square of the current
c. proportional to the current
d. proportional to square of the current
Q. The steady state stability of the power system can be increased by
a. connecting lines in parallel
b. connecting lines in series
c. using machines of high impedance
d. reducing the excitation of machines
Q. The inductive interference between power and communication linecan be minimized by
a. transposition of the power line
b. transposition of the communication line
c. both (a) and (b)
d. increasing the distance between the conductors
Q. The power loss is an important factor for the design of
a. transmission line
b. motor
c. generator
d. feeder
Q. A fuse is connected
a. in series with circuit
b. in parallel with circuit
c. either in series or in parallel with circuit
d. none of the above