Electrical Power Transmission MCQs Part 17

Electrical Power Transmission MCQs Part 17

The charging current in transmission line

The charging current in transmission line:

1. Leads the voltage by 90°
2. Lags the voltage by 90°
3. Leads the voltage by 45°
4. Lags the voltage by 45°

Correct answer: 1. Leads the voltage by 90°

Explanation: The charging current is actually capacitive, it therefore leads the voltage by 90°.

The effect of increase in temperature of overhead line is to

The effect of increase in temperature of overhead line is to:

1. Increase the length only
2. Increases the stress only
3. Increase the stress but decrease the length
4. Increase the length but decrease the stress

Correct answer: 1. Increase the length but decrease the stress

Overhead transmission line conductor vibration may cause

Overhead transmission line conductor vibration may cause:

1. Excessive sag
2. Breaking of insulator discs
3. Collapse of supporting structures
4. All of these

Correct answer: 4. All of these

The receiving end power factor of short transmission line is shifting from lagging toward leading. Voltage regulation of line will

The receiving end power factor of short transmission line is shifting from lagging toward leading. Voltage regulation of line will:

1. Increase
2. Decrease
3. Remain same
4. None of these

Correct answer: 2. Decrease

Insulators can be exposed to failure due to

Insulators can be exposed to failure due to:

1. Deposition of dust
2. Flash-over
3. Short-circuits
4. Any of above

Correct answer: 4. Any of above

See complete list of Electric Power Transmission MCQs here

MCQs in Electrical Engineering:

1. Basic Electrical Laws and Theorems
2. Basic Voltage and Current MCQs
3. High Voltage Engineering MCQs
4. Induction Motor MCQs
5. Power Electronics
6. Power Distribution MCQs
7. Power Generation MCQs
8. Power System Protection MCQs