Switchgear Protections Objective type Questions and Answers pdf

61.    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
Ans: c

62.    For cost and safety, the outdoor substa tions are installed for voltages above
(a) 11 kV 
(b) 33 kV
(c) 60kV              
(d) 110kV
Ans: b

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
Ans: d

64    relays are used for phase faults on long line.
(a) Impedance 
(b) Reactance
(c) Either of the above
(d) None of the above
Ans: a

65.   For which of the following protection from  negative  sequence  currents  is provided ?
(a) Generators     
(b) Motors
(c) Transmission line
(d) Transformers
Ans: a

66    relay is preferred for phase fault on short transmission line.
(a) Induction type
(b) Reactance
(c) Impedance
(d) None of the above
Ans: b

67.    Distance relays are generally
(a) split-phase relays
(b) reactance relays
(c) impedance relays
(d) none of the above
Ans: d

68.    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
Ans: b

69.    A _______ is used to measure the stator % winding temperature of the generator.
(a)     thermocouple
(b)     pyrometer
(c)    resistance thermometer
(d)    thermometer
Ans: c

70.    The under voltage relay can be used for
(a) generators 
(b) busbars
(c) transformers   
(d) motors
(e) all of the above
Ans: e

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