Realtime Switchgear Protections Multiple choice Questions and Answers pdf

21.    Air blast circuit breaker is used for
(a)     over currents 
(b)     short duty
(c)    intermittant duty
(d)    repeated duty
Ans: d

22.    An efficient and a well designed protective relaying should have
(a)     good selectivity and reliability
(b)     economy and simplicity
(c)    high speed and selectivity
(d)    all of the above
Ans: d

23.    Burden of a protective relay is the power
(a)     required to operate the circuit breaker
(b)     absorbed by the circuit of relay
(c)    developed by the relay circuit
(d)    none of the above
Ans: b

24.    Directional relays are based on flow of
(a) power 
(b) current
(c) voltage wave  
(d) all of the above
Ans: a

25.    A differential relay measures the vector difference between
(a)     two currents  
(b)     two voltages
(c)    two or more similar electrical quan¬tities
(d)    none of the above
Ans: c

26.    A transmission line is protected by
(a)     inrush protection
(b)     distance protection
(c)    time graded and current graded over current protection
(d)    both (b) and (c)
(e)    none of the above
Ans: d

27.    Large internal faults are protected by
(a)     merz price percentage differential protection
(b)     mho and ohm relays
(c)    horn gaps and temperature relays
(d)    earth fault and positive sequence relays
Ans: a

28.    When a transmission line is energized, the wave that propagates on it is
(a)    current wave only
(b)    voltage wave only
(c)    both (a) and (b)
(d)     power factor wave only
Ans: c

29.    Protective relays are devices that detect abnormal conditions in electrical circuits by measuring
(a)     current during abnormal condition
(b)     voltage during abnormal condition
(c)    constantly the electrical quantities which differ during normal and abnormal conditions
(d)    none of the above
Ans: c

30.    The voltage appearing across the contacts after opening of the circuit breaker is called______voltage.
(a) recovery 
(b) surge
(c) operating 
(d) arc
(e) none of the above
Ans: a

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