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Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test - Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems

Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems below.
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Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 1

The bus admittance (Ybus ) matrix of a 3-bus power system is given below.

Considering that there is no shunt inductor connected to any of the buses, which of the following can NOT be true?

Detailed Solution for Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 1

Power system network :

Hence, option (A) will not be correct.

Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 2

A single-phase, two wire transmission line, 15 km long, is made up of round conductors, each 0.8 cm radius, separated from each other by 40 cm. The equivalent diameter of a fictitious hollow, thin-walled conductor having the same inductance as the original line is given by

Detailed Solution for Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 2

The fictitious conductor is one whose radius is r' and whose diameter is therefore,

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Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 3

If the conductor radius increases, inductance of the line,

Detailed Solution for Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 3

Inductance,

Here, GMR radius of conductor.
Hence, if radius increases, GMR also increases. As a result of which inductance will decrease.

Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 4

For an underground cable, the surge impedance is generally taken as

Detailed Solution for Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 4

For underground cable, Zs = 40 Ω
For overhead line, Zs = 400 Ω

Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 5

Consider the following phenomenon occuring in a power system:
1. Corona loss
2. Charging current
3. Ferranti effect
4. Dielectric loss
5. Skin effect
Which of the above are associated with transmission lines?

Detailed Solution for Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 5

Dielectric loss occurs in underground cables not in a transmission line.

Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 6

The corona loss or the critical disruptive voltage in a transmission line at a temperature (f) and pressure (b) can be foundout by Using “air density correction factor (δ)” given by

Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 7

A three-phase, 50 Hz, 400 kV, transmission line is 300 km long. The line inductance is 0.97 mH/km per phase and capacitance is 0.0115 μF/km per phase. Assuming a lossless line, the surge impedance of the line will be

Detailed Solution for Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 7

Surge impedance of the line is given by

or, 

Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 8

The resistance and reactance of a short line are equal. At zero regulation the load will be

Detailed Solution for Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 8

Zero regulation of a transmission line occurs at a leading power factor when φ = θ.
Since R = X

Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 9

Shunt reactors are needed

Detailed Solution for Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 9

Shunt reactors are used to bring down receiving end voltage during light load or no-load condition to overcome Ferranti effect.

Test: Performance of Transmission Lines, Line Parameters & Corona of Power Systems - Question 10

Operating transmission lines close to their maximum power transfer capability will impair

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