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

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