Power system MCQ #14

Power system MCQ 193 to 196:

193) Which distribution scheme is preferred for good efficiency and high economy?

      (a) single phase, two wire system

      (b) three phase, four wire system

      (c) three phase, three wire system

      (d) two phase, three wire system

194) The function of steel wire in an ACSR conductor is

      (a) reduce inductance

      (b) to compensate for skin effect

      (c) provide mechanical strength

      (d) take care of surges

195) The stranded conductors are used in HT transmission line to

      (a) reduced resistivity

      (b) increase tensile strength

      (c) cheaper in cost

      (d) ease in handling

196) For which reason, the ACSR conductors are used in overhead line instead of copper conductor.

      (a) being lighter in weight

      (b) higher current carrying capacity

      (c) economy

      (d) higher tensile strength

ANSWER: | 193-b | 194-c | 195-d | 196-c |

Power system MCQ 197 to 200:

197) Which type of insulator is used in 132 kV transmission line?

      (a) shackle type insulator

      (b) disc type insulator

      (c) pin type insulator

      (d) pin and shackle type insulator

198) In a transmission line, sag depends upon

      (a) span length

      (b) weight of the conductor per unit length

      (c) tension in conductor

      (d) all of the above

199) The number of discs in a string of insulator for 400 kV AC overhead transmission line lies in the range of

      (a) 32 to 33

      (b) 22 to 23

      (c) 15 to 16

      (d) 9 to 10

200) The conductor carries more current on the surface in comparison of its core. This phenomenon is called as

      (a) Lenz’s law

      (b) corona

      (c) Ferranti effect

      (d) skin effect

ANSWER: | 197-b | 198-d | 199-b | 200-d |

Power system MCQ 201 to 204:

201) For a stranded conductor, the ratio of GMR to actual radius is

      (a) equal to 1

      (b) less than 0.7788

      (c) equal to 0.7788

      (d) more than 1

202) The characteristic impedance of the lossy transmission line not depends on

      (a) conductivity of the dielectric separating conductors

      (b) the conductivity of conductor

      (c) the operating frequency of the line

      (d) length of line

203) How to increase the capability of high voltage long transmission line?

      (a) the series reactance can be reduced

      (b) by decrease the resistance

      (c) by increase the resistance

      (d) the shunt admittance can be reduced

204) The insulation resistivity is _______, with the rise in temperature.

      (a) increase linearly

      (b) decrease linearly

      (c) remain unchanged

      (d) reduce exponentially

ANSWER: | 201-b | 202-d | 203-a | 204-d |

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