Hiried Switchgear Protections Multiple choice Questions and Answers pdf

51.    The line insulation is the insulation level of the station equipment.
(a) less than
(b) same as
(c) more than
(d) proportional to
(e) not directly related with
Ans: e

52.    The interaction between a transmission line and communication line js 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
Ans: d

53.    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
(e)    all of the above
Ans: d

54.    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
Ans: a

55.    Discrimination between main and back up protection is provided by the use of relays which are
(a) fact
(b) sensitive
(c) slow
(d) none of the above
Ans: c

56.    Induction cup relay is operated due to changes in
(a) current
(b) voltage
(c) impedance
(d) all of the above
Ans: d

57.    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
(e) none of the above
Ans: d

58.    Which of the following statements is incorrect ?
(a)    Lightning arrestors are used before the switchgear
(b)    Shunt reactors are used as compensation reactors
(c)    The peak short current is (1.8 xV2) times the A.C. component
(d)    The MVA at fault is equal to base MVA divided by per unit equivalent fault reactance
Ans: a

59.    Short-circuit currents are due to
(a)     single phase to ground faults
(b)     phase to phase faults
(c)    two phase to ground faults
(d)    three phase faults
(e)    any of these
Ans: e

60.    To reduce short circuit fault currents are used.
(a)     reactors
(b)     resistors
(c)    capacitors
(d)    none of the above
Ans: a

Read More Questions:
Switchgear Protections MCQs Part1
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