Switchgear and Protection MCQs | Switchgear and Protection Multiple Choice Questions with Answers

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Questions
61 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

Answer: load flow, short-circuit and stability
62 Short-circuit currents are due to
A single phase to ground faults
B phase to phase faults
C two phase to ground faults
D any of these

Answer: any of these
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63 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

Answer: impulse voltage
64 For which of the following protection from negative sequence currents is provided ?
A Generators
B Motors
C Transmission line
D Transformers

Answer: Generators
65 Relay is preferred for phase fault on short transmission line.
A Induction type
B Reactance
C Impedance
D None Of The Above

Answer: Reactance
66 For which of the following ratings of the transformer differential protection is recommended ?
A above 30 kVA
B equal to and above 5 MVA
C equal to and above 25 MVA
D none of the above

Answer: equal to and above 5 MVA
67 The under voltage relay can be used for
A generators
B busbars
C transformers
D all of the above

Answer: all of the above
68 The single phasing relays are used for the protection of
A single phase motors only
B two phase motors only
C two single phase motors running in parallel
D three phase motors

Answer: three phase motors
69 Which of the following parameter can be neglected for a short line ?
A Inductance
B Capacitance
C Resistance
D All Of The Above

Answer: Capacitance
70 Which of the following circuit breakers has high reliability and minimum maintenance ?
A Air blast circuit breakers
B Circuit breaker with SF6 gas
C Vacuum circuit breakers
D Oil circuit breakers

Answer: Circuit breaker with SF6 gas
71 Transmission line has reflection coefficient as one.
A Open circuit
B Short-circuit
C Long
D None of the above

Answer: Open circuit
72 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

Answer: internal short-circuits
73 Air blast circuit breakers for 400 kV power system are designed to operate in
A 100 microsecond
B 50 millisecond
C 0.5 sec
D 0.1 sec

Answer: 50 millisecond
74 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

Answer: compensate for line inductive reactance
75 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

Answer: lower than that of if fault occurs away from the relay
76 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 all of the above

Answer: inversely proportional to the square of the current
77 The inductive interference between power and communication line can 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

Answer: both (a) and (b)
78 The power loss is an important factor for the design of
A transmission line
B motor
C generator
D feeder

Answer: transmission line
79 H.R.C. fuse, as compared to a rewirable fuse, has
A no ageing effect
B high speed of operation
C high rupturing capacity
D all of the above

Answer: all of the above
80 The fuse rating is expressed in terms of
A current
B voltage
C VAR
D kVA

Answer: current

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