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:
- Ionization of particles
- Vortex winds phenomenon
- Freezing rain creating icicles
- 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:
- d, c, b, a
- a, c, b, d
- a, b, c, d
- 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:
- Short circuits
- Flash over
- Dust deposition
- 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:
- Corrodes conductor
- Results in power factor improvement
- Increases voltage regulation
- 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:
- Reduce corona
- Provide sag profile
- Control conductor vibrations
- Compensate for lines losses
Correct answer: 3. Control conductor vibrations