Electrical Power Transmission MCQs Part 9

1. The point which should be considered while designing transmission systems:

1. Selection of transmission route
2. Expansion planning
3. Network analysis
4. Observation of Reliability
5. All of these

Correct answer: 5. All of these

2. Short transmission lines are modeled by:

1. Series resistance and series inductance
2. Series resistance and series capacitance
3. Series resistance and shunt capacitance
4. Series resistance, series capacitance, and series inductance

Correct answer: 1. Series resistance and series inductance

3. Shunt capacitance of short transmission lines is:

1. Very high
2. Negligible
3. 0.85 times the long lines
4. 0.46 times the medium lines
5. Both 3 and 4

Correct answer: 2. Negligible

4. The best conductor for transmission lines in terms of conductivity:

1. Copper
2. Aluminum
3. Iron
4. Steel

Correct answer: 1. Copper

5. The number of wire strands in a 5 layer transmission line:

1. 16
2. 20
3. 47
4. 61
5. 91

Correct answer: 4. 61

Solution: Number of stands = 3(n² – n) + 1

6. Bundled conductors are recommended above:

1. 67 kV
2. 120 kV
3. 230 kV
4. 400 kV

Correct answer: 3. 230 kV

7. The effective radius of multiple strand wire is calculated using:

1. Kelvin law
2. Guy’s theorem
3. Transposition
4. Proximity theorem

Correct answer: 2. Guy’s theorem

8. Ozone generation due to corona effect is undesired because:

1. It corrodes the conductor
2. It gives poor visual effect
3. It smells bad
4. It increases the effective area of the conductor

Correct answer: 1. It corrodes the conductor

9. The discharge path in a punctured insulator:

1. From the first disc to the third disc
2. Is through air gaps
3. Throughout the body of the conductor
4. None of above

Correct answer: 3. Throughout the body of the conductor

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