Tricky Transmission and Distribution Multiple choice Questions and Answers pdf

81.    Pin type insulators are generally not used for voltages beyond
(a) 1 kV 
(b) 11 kV
(c) 22 kV 
(d) 33 kV
Ans: d

82.    Aluminium has a specific gravity of
(a) 1.5 
(b) 2.7
(c) 4.2 
(d) 7.8
Ans: b

83.    For transmission of power over a distance of 200 km, the transmission voltage should be
(a) 132 kV 
(b) 66 kV
(c) 33 kV 
(d) 11 kV
Ans: a

84.    For aluminium, as compared to copper, all the following factors have higher values except
(a) specific volume
(6) electrical conductivity
(c) co-efficient of linear expansion
(d) resistance per unit length for same cross-section
Ans: b

85.    Which of the following equipment, for regulating the voltage in distribution feeder, will be most economical ?
(a)     Static condenser
(b)    Synchronous condenser
(c)    Tap changing transformer
(d)    Booster transformer
Ans: d

86.    In a tap changing transformer, the tappings are provided on
(a)    primary winding
(b)    secondary winding
(c)    high voltage winding
(d)    any of the above
Ans: b

87.    Constant voltage transmission entails the following disadvantage
(a)    large conductor area is required for same power transmission
(b)    short-circuit current of the system is increased
(c)    either of the above
(d)    none of the above
Ans: b

88.    On which of the following factors skin effect depends ?
(a)    Frequency of the current
(b)    Size of the conductor
(c)    Resistivity of the conductor material
(d)    All of the above
Ans: d

89.    The effect of corona can be detected by
(a)    presence of zone detected by odour
(b)    hissing sound
(c)    faint luminous glow of bluish colour
(d)    all of the above
Ans: d

90.    For transmission of power over a distance of 500 km, the transmission voltage should be in the range
(a) 150 to 220 kV
(b) 100 to 120 kV
(c) 60 to 100 kV   
(d) 20 to 50 kV
Ans: a

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