Long transmission line - MCQs with Answers

Long transmission line - MCQs with Answers

Q1. The transmission lines above what length is termed as the long lines?

a. More than 100 km
b. 150 km and above
c. 250 km and above
d. Less than 100 km

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Q2. What happens in a long transmission lines under no load?

a. The receiving end voltage is less than the sending end voltage.
b. The sending end voltage is less then receiving end voltage.
c. The sending end voltage is equal to receiving end voltage.
d. None of these.

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Q3. What is the normal range of angle for the parameter A?

a. 90 °
b. 70 ° - 40 °
c. 40 ° - 10 °
d. 0 - 10 °

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Q4. The ABCD parameter of a 3 phase transmission line is given as follows

A = D = 0.8 ∠ 1 °, B = 170 ∠ 85 ° Ω , and C = 0.002 ∠ 90.4 ° ℧ the sending end voltage is 400 kV. What is the receiving end voltage under no load condition?

a. 400 kV
b. 500 kV
c. 320 kV
d. 417 kV

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Q5. The ABCD parameter of a 3 phase transmission line is given as follows

A = D = 0.9 ∠ 0 °, B = 200 ∠ 90 ° Ω , and C = 0.95 *10^-3 ∠ 90 ° ℧ . At no load condition a shunt inductive reactor is connected at the receiving end of the line to limit the receiving end voltage to be equal to the sending end voltage. What is the ohmic value of the reactor?

a. Infinity.
b. 2000 Ω
c. 105.26 Ω
d. 1052.6 Ω

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Q6. The value of A parameter of a transmission line

a. Increases with increase in length of line.
b. Decreases with increase in line length.
c. Is independent of line length.
d. None of these.

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Q7. Transmission efficiency of a transmission line increases with the

a. Decrease in power factor and voltage.
b. Increase in power factor and voltage.
c. Increase in power factor but decrease in voltage.
d. Increase in voltage and decrease in power factor.

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