1. A counterpoise is buried under a transmission line:

- To increase the ground resistance
- To decrease the ground resistance
- To increase design strength
- To increase inductance

Correct answer: 2. To decrease the ground resistance

2. The disadvantage of Low power factor:

- Raises rating of transmission equipment
- Increased voltage drops
- Poor voltage regulation
- All of these
- None of these

Correct answer: 4. All of these

3. The resistance of a transmission line:

- Increase with the increase of length
- Increases with the decrease of length
- Is independent of the length
- Any of above

Correct answer: 1. Increase with the increase of length

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

- It is directly related to the voltage
- It is directly related to the square of the voltage
- It is inversely related to the voltage
- 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:

- Is negligible
- Is more than OH lines
- Is smaller than OH lines
- 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:

- 15%
- 25%
- 32%
- 48%

Correct answer: 3. 32%

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

- 2.5 m
- 5 m
- 7.5 m
- 10 m

Correct answer: 1. 2.5 m

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

8. The more practical case for transmission lines installation:

- Install more towers and reduce the height of each tower
- Install fewer towers and increase the height
- Install more towers and increase the height
- Install fewer towers and reduce the height

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

9. Generally, overhead transmission lines insulators are made from:

- Glass
- Aluminum
- Porcelain
- Plastic
- Polythene

Correct answer: 3. Porcelain

10. Corona on transmission lines:

- Results energy loss
- Produces ozone
- Increases diameter of the conductor
- None of these
- All of these

Correct answer: 5. All of these

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