100 TOP Switchgear Protections Multiple choice Questions and Answers pdf

81.    Over voltage protection is recommended for
(a)     hydro-electric generators
(b)     steam turbine generators
(c)    gas turbine generators
(d)    all of the above
(e)    none of the above
Ans: d

82.    Air blast circuit breakers for 400 kV power system are designed to operate in
(a)    100 micro-second
(b)    50 milli-second
(c)    0.5 sec 
(d)     0.1 sec
Ans: b

83.    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
Ans: b

84.    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
Ans: a

85.    Admittance relay is _______ relay.
(a)     impedance 
(b)     directional
(c)     non-directional
(d)     none of the above
Ans: b

86.    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
Ans: a

87.    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
Ans: b

88.    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
Ans: b

89.    The steady state stability of the power system can be increased by
(a)     connecting lines in parallel
(b)     connecting lines in series
(e)    using machines of high impedance
(d)    reducing the excitation of machines
(e)    none of the above
Ans: a

90.    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
Ans: c

Read More Questions:
Switchgear Protections MCQs Part1
Switchgear Protections MCQs Part2
Switchgear Protections MCQs Part3
Switchgear Protections MCQs Part4
Switchgear Protections MCQs Part5
Switchgear Protections MCQs Part6
Switchgear Protections MCQs Part7
Switchgear Protections MCQs Part8
Switchgear Protections MCQs Part9
Switchgear Protections MCQs Part10
Switchgear Protections MCQs Part11