# Electrical Power Transmission MCQs Part 2

1. A counterpoise is buried under a transmission line:

1. To increase the ground resistance
2. To decrease the ground resistance
3. To increase design strength
4. To increase inductance

Correct answer: 2. To decrease the ground resistance

2. The disadvantage of Low power factor:

1. Raises rating of transmission equipment
2. Increased voltage drops
3. Poor voltage regulation
4. All of these
5. None of these

Correct answer: 4. All of these

3. The resistance of a transmission line:

1. Increase with the increase of length
2. Increases with the decrease of length
3. Is independent of the length
4. Any of above

Correct answer: 1. Increase with the increase of length

4. The relationship between the volume of transmission line conductor to voltage:

1. It is directly related to the voltage
2. It is directly related to the square of the voltage
3. It is inversely related to the voltage
4. It is inversely related to the square of the voltage

Correct answer: 4. It is inversely related to the square of the voltage

5. Charging current in underground lines:

1. Is negligible
2. Is more than OH lines
3. Is smaller than OH lines
4. Is equal to OH lines

Correct answer: 2. Is more than OH lines

6. An increase in the length of the transmission line by 15% increases the sag by:

1. 15%
2. 25%
3. 32%
4. 48%

7. Find the age of a 200 m long transmission line having 0.5 kg/km weight and working tension of 1000 kg:

1. 2.5 m
2. 5 m
3. 7.5 m
4. 10 m

Solution: Sag = (weight * length * length) / (8 * Tension)

8. The more practical case for transmission lines installation:

1. Install more towers and reduce the height of each tower
2. Install fewer towers and increase the height
3. Install more towers and increase the height
4. Install fewer towers and reduce the height

Correct answer: 1. Install more towers and reduce the height of each tower

1. Glass
2. Aluminum
3. Porcelain
4. Plastic
5. Polythene