Electrical Power Transmission MCQs Part 20

Electrical Engineering MCQs on Power Transmission Part 20

Presence of earth in case of overhead lines

Presence of earth in case of overhead lines:

1. Increases the capacitance
2. Increases the inductance
3. Decreases the capacitance
4. Decreases the inductance

Correct answer: 1. Increases the capacitance

In order to eliminate sheath losses, a successful method is

In order to eliminate sheath losses, a successful method is:

1. To transpose cables only
2. To transpose cable along with cross bonding
3. Cross bonding cables only
4. None of these

Correct answer: 2. To transpose cable along with cross bonding

HVDC transmission is preferred to HVAC since

HVDC transmission is preferred to HVAC since:

1. Harmonics problem is avoided
2. HVDC terminal equipment is inexpensive
3. VAR compensation is not needed in case of HVDC
4. System stability can be improved

Correct answer: 4. System stability can be improved

Galvanized steel is generally used as

Galvanized steel is generally used as

1. Earth wire
2. Stray wire
3. Structural components
4. All of the above

Correct answer: 4. All of these

The number of strands of ACSR conductor for 3 layer transmission line

The number of strands of ACSR conductor for 3 layer transmission line:

1. 1
2. 5
3. 19
4. 35

Correct answer: 3. 19

Explanation:

Total number of strands N = 3x² – 3x + 1

Where, x = Number of layers = 3

Total number of strands N = 3×3² – 3×3 + 1 = 19