Electrical Power Transmission MCQs Part 3

1. DC transmission is _____ less expensive than a transmission for the same power ratings:

  1. 20%
  2. 33%
  3. 66%
  4. 80%

Correct answer: 2. 33%

2. Overhead transmission lines have a break-even distance of:

  1. 200 mile
  2. 500 mile
  3. 1000 mile
  4. 5000 mile

Correct answer: 2. 500 mile

3. With a decrease in the size of the conductor the corona effect:

  1. Increases
  2. Decreases
  3. Remains constant
  4. Any of above

Correct answer: 1. Increases

4. In stormy weather the corona effect:

  1. Occurs at a lower temperature
  2. Occurs at the high temperature
  3. Does not occurs
  4. The storm has no relationship with corona

Correct answer: 1. Occurs at a lower temperature

5. The safety factor of the insulator is defined as the:

  1. Puncture strength / Flash – overvoltage
  2. Puncture strength * Flash – overvoltage
  3. ( 0.5 * Puncture strength) / (0.88 Flash – overvoltage)
  4. 1 / Puncture strength

Correct answer: 1. Puncture strength / Flash – overvoltage

6. Power factor of dc transmission lines is:

  1. Leading
  2. Lagging
  3. Unity
  4. Zero

Correct answer: 3. Unity

7. Converters in dc transmission lines:

  1. Consume reactive power
  2. Produce reactive power
  3. None of above
  4. Any of above

Correct answer: 1. Consume reactive power

8. A punctured insulator is:

  1. Permanently damaged
  2. Partially damaged
  3. Repaired by waxing
  4. Repaired by filling

Correct answer: 1. Permanently damaged

9. With an increase in frequency the skin effect:

  1. Increases
  2. Decreases
  3. Remains constant
  4. Any of above

Correct answer: 1. Increases

10. Length of cable is halved, the capacitance will:

  1. Remain constant
  2. Halved
  3. Doubled
  4. Will increase by 1.33 times

Correct answer: 2. Havled


Next Electrical Power Transmission MCQs Part 4

List of All: Electrical Power Transmission MCQs

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