Electric Power Transmission and Distribution MCQ Part 8

Electrical Engineering MCQ topic Electric Power Transmission and Distribution MCQ Part 8.

Complete List of Power T&D MCQ Questions.

Overhead transmission lines galloping occurs due to

Overhead transmission lines galloping occurs due to:

  1. Ionization of particles
  2. Vortex winds phenomenon
  3. Freezing rain creating icicles
  4. Unsymmetrical sag phenomenon

Correct answer: 3. Freezing rain creating icicles

Conductivities of Different materials

a) Copper b) annealed copper c) Iron d) Lead

Of mentioned materials which of the following indicates the correct order of conductivities in ascending order:

  1. d, c, b, a
  2. a, c, b, d
  3. a, b, c, d
  4. d, a, b, c

Correct answer: 1. d, c, b, a

Insulators may fail due to

Insulators may fail due to which of the mentioned reasons:

  1. Short circuits
  2. Flash over
  3. Dust deposition
  4. All of these

Correct answer: 4. All of these

Effect of Ozone Presence due to Corona on Overhead Transmission Lines

Ozone presence on due to corona:

  1. Corrodes conductor
  2. Results in power factor improvement
  3. Increases voltage regulation
  4. Decreases voltage regulation

Correct answer: 1. Corrodes conductor

Why Stock bridge dampers on overhead transmission lines are used

Stock bridge dampers on overhead transmission lines are employed to:

  1. Reduce corona
  2. Provide sag profile
  3. Control conductor vibrations
  4. Compensate for lines losses

Correct answer: 3. Control conductor vibrations

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