Hiried Transmission and Distribution Multiple choice Questions and Answers pdf

51.    Which of the following is usually not the generating voltage ?
(a) 6.6 kV 
(b) 8.8 kV
(c) 11 kV 
(d) 13.2 kV
Ans: b

52.    For an overhead line, the surge impedance is taken as
(a) 20-30 ohms  
(b) 70—80 ohms
(c) 100—200 ohms
(d) 500—1000 ohms
(e) none of the above
Ans: c

53.    The presence of ozone due to corona is harmful because it
(a)     reduces power factor
(b)     corrodes the material
(c)    gives odour
(d)    transfer energy to the ground
(e)    none of the above
Ans: b

54.    A feeder, in a transmission system, feeds power to
(a)     distributors
(b)     generating stations
(c)    service mains
(d)    all of the above
Ans: a

55.    The power transmitted will be maximum when
(a)    corona losses are minimum
(b)    reactance is high
(c)    sending end voltage is more
(d)    receiving end voltage is more
Ans: c

56.    A 3-phase 4 wire system is commonly used on
(a)    primary transmission
(b)    secondary transmission
(c)    primary distribution
(d)    secondary distribution
Ans: d

57.    Which of the following materials is used for overhead transmission lines ?
(a)    Steel cored aluminium
(b)    Galvanised steel
(c)    Cadmium copper
(d)    Any of the above
Ans: d

58.    Which of the following is not a constituent for making porcelain insulators ?
(a) Quartz 
(b) Kaolin
(c) Felspar 
(d) Silica
Ans: d

59.    There is a greater possibility of occurence of corona during
(a) dry weather   
(b) winter
(c) summer heat  
(d) humid weather
(e) none of the above
Ans: d

60.    Which of the following relays is used on long transmission lines ?
(a) Impedance relay
(b) Mho's relay
(c) Reactance relay
(d) None of the above
Ans: b

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