148. As the height of a transmission tower is altered, the parameter which changes is
A. inductance
B. capacitance
C. conductance
D. none of these

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149. The Kelvin's law is limited because which of the following assumption made in it is only partly true?
A. load factor is uniform
B. annual charges are of the form P1 + aP2
C. both (a) and (b) above
D. none of the above

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150. In conductor of power transmission line, the voltage gradient is maximum at its
A. centre
B. surface
C. circle with half the radius
D. somewhere between B and C above

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151. EHV cables are filled with thin oil under pressure to
A. prevent formation of voids
B. prevent entry of moisture
C. to strengthen the cable conductor
D. to provide insulation

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152. Cables in power transmission line are provided with intersheaths to
A. minimize stress
B. minimize high voltage
C. provide uniform stress distribution minimize charging current
D.

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153. Impedance and capacitance of a transmission line depend upon
A. current in the line alone
B. voltage in the line alone
C. both A and B
D. physical configuration of conductors in space

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154. Capacitance between the two conductors of a single phase two wire line is 0.5 AF/km. The capacitance of each conductor to the neutral will be
A. 0.5 AF/km
B. 0.25 tiF/km
C. 1.0 pF/Icm
D. 2.0 ptF/km

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