Electric Power Transmission MCQs Part 12

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Electric Power Transmission MCQs Part 12

The bundled arrangement reduces

The bundled arrangement reduces:

  1. Inductance of line
  2. Power loss due to corona
  3. Radio interference due to corona
  4. All of these

Correct answer: 4. All of these

The string efficiency for DC system is

The string efficiency for DC system is:

  1. 25%
  2. 50%
  3. 75%
  4. 100%

Correct answer: 4. 100%

Explanation: For a DC power system the insulator capacitances are ineffective. Therefore the efficiency in case of DC system is 100%.

The skin effect depends on

The skin effect depends on:

  1. Frequency
  2. Diameter of wire
  3. Nature of material
  4. All of these

Correct answer: 4. All of these

The most commonly used material for overhead transmission line insulators is

The most commonly used material for overhead transmission line insulators is:

  1. Glass
  2. Steatite
  3. Porcelain
  4. None of these

Correct answer: 3. Porcelain

Definition of short transmission lines

The lines below _____ are considered as short transmission lines:

  1. 20 km
  2. 80 km
  3. 240 km
  4. 600 km

Correct answer: 2. 80 km

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