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

View Answer / Hide Answer

ANSWER: b. 150 km and above



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.

View Answer / Hide Answer

ANSWER: b. The sending end voltage is less then receiving end voltage.



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

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

View Answer / Hide Answer

ANSWER: d. 0 - 10°



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

View Answer / Hide Answer

ANSWER: b. 500 kV



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

View Answer / Hide Answer

ANSWER: b. 2000 Ω



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.

View Answer / Hide Answer

ANSWER: a. Increases with increase in length of line.



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.

View Answer / Hide Answer

ANSWER: b. Increase in power factor and voltage.


Post your comment