Most recently Switchgear Protections Multiple choice Questions and Answers pdf

41.    The delay fuses are used for the protection of ________ .
(a)     motors
(b)     power outlet circuits
(c)    fluorescent lamps
(d)    light circuits
Ans: a

42.    Which of the following is the least expensive protection for overcurrent is low voltage system ?
(a)    Rewireable fuse
(b)    Isolator
(c)    Oil circuit breaker
(d)     Air break circuit breaker
(e)    None of the above
Ans: a

43.    Resistance grounding is used for voltage between
(a)  33kVto66kV
(b)  HkVto33kV
(c)  3.3kVandllkV
(d)  none of the above
Ans: c

44.    The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to
(a)    lubricate the contacts
(b)    insulate the contacts from switch body
(c)    extinguish the arc
(d)    all of the above
(e)    none of the above
Ans: c

45.    In Railway applications ______ circuit breaker is used.
(a) SFe 
(b) bulk oil
(c) minimum oil   
(d) air break
Ans:

46.    To protect most of the electrical equipment handling low power, the types of relays used are
(a)    thermocouple
(b)    electronic and bimetallic
(c)    both (a) and (b)
(d)    none of the above
Ans: c

47.    Wave trap is used to trap waves of
(a)     power frequencies
(b)     higher frequencies entering genera¬tor or transformer units
(c)    either of the above
(d)    none of the above
Ans: b

48.    Ungrounded neutral transmission system is not recommended because of system
(a)     insulation being overstressed due to pver voltages
(b)    insulation overstress may lead to failure and subsequent phase to phase faults
(c)    being inadequately protected against ground fault
(d)    all of the above
Ans: d

49.    The reflection co-efficient at the open circuited end of a transmission line.
(a)     zero 
(b)     infinity
(c)    unity
(d)    none of the above
Ans: c

50.    For the protection of power station buildings against direct strokes the requirements are
(a)     interception
(b)     interception and conduction
(c)    interception, conduction and dis-sipation
(d)    interception, conduction, dissipation and reflection
(e)    none of the above
Ans: c

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