Transmission and Distribution Objective type Questions and Answers pdf

61.    The steel used in steel cored conductors is usually
(a) alloy steel 
(b) stainless steel
(c) mild steel 
(d) high speed steel
(e) all of the above
Ans: c

62.    Which of the following distribution systems is more reliable ?
(a) Radial system
(b) Tree system
(c) Ring main system
(d) All are equally reliable
Ans: c

63.    Which of the following characteristics should the line supports for transmission lines possess ?
(a)    Low cost
(b)    High mechanical strength
(c)    Longer life 
(d)    All of the above
Ans: d

64.    Transmission voltage of llkV is normally used for distances upto
(a) 20—25 km 
(b) 40—50 km
(c) 60—70 km 
(d) 80—100 km
Ans: a

65.    Which of the following regulations is considered best?
(a) 50% 
(b) 20%
(c) 10% 
(d) 2%
Ans: d

66.    Skin effect is proportional to
(a)    (conductor diameter)
(b)    (conductor diameter)
(c)    (conductor diameter)
(d)    (conductor diameter)
(e)    none of the above
Ans: c

67.    A conductor, due to sag between two supports, takes the form of
(a) semi-circle 
(b) triangle
(c) ellipse 
(d) catenary
Ans: d

68.    In AC.S.R. conductors, the insulation between aluminium and steel conductors is
(a)     insulin 
(b)     bitumen
(c)    varnish
(d)    no insulation is required
Ans: d

69.    Which of the followingbus-bar schemes has the lowest cost ?
(a)     Ring bus-bar scheme
(b)     Single bus-bar scheme
(c)    Breaker and a half scheme
(d)    Main and transfer scheme
Ans: b

70.    Owing to skin effect
(a) current flows through the half cross-section of the conductor
(b) portion of the conductor near the surface carries more current and core of the conductor carries less current
(c) portion of the conductor near the surface carries less current and core of the conductor carries more current
(d) any of the above
(e) none of the above
Ans: b

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