Electrical Engineering · Question Bank

Transmission Lines

15 questions. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
#1
A single solid round copper wire has a diameter of 0.50 inch. Determine its self GMD.
A0.3894 inch
B0.1947 inch
C0.1825 inch
D0.25 inch
#2
Determine the mutual GMD of a three-phase single-circuit transmission line whose conductors arranged in a triangular formation so that the two distances between conductors are 20 ft and the third is 38 ft, respectively?
A24.77 ft
B25.35 ft
C23.67 ft
D26.43 ft
#3
A three-phase double circuit line has a horizontal spacing of 40 ft and a vertical spacing between adjacent levels of 25 ft. Determine the mutual GMD of the line.
A43.08 ft
B42.64 ft
C41.42 ft
D40.56 ft
#4📜 EE Board March 1998
A 230 kV transmission line is 100 miles long. The conductor is ACSR of 1,113,000 CM. The conductors are horizontally arranged with 20 ft spacing. The resistance per mile is 0.0969 ohm and its GMR is 0.0435 ft. What is the impedance of the line?
A\(9.69 + j95.25\text{ ohms}\)
B\(3.23 + j95.25\text{ ohms}\)
C\(9.69 + j77.19\text{ ohms}\)
D\(3.23 + j25.93\text{ ohms}\)
#5📜 EE Board October 1997
A 34.5 kV feeder line is 5 miles long. The conductors are space 4 feet horizontally. The conductor is 4/0 copper with GMR of 0.01668 ft. What is the reactance?
A2.36 ohms
B6.72 ohms
C3.46 ohms
D5.16 ohms
#6
A single-phase transmission line 15 km long is using copper conductors of diameter 0.8 cm. If the distance between conductors is 1.25 m, determine the self-inductance of the transmission lines.
A0.036 H
B0.024 H
C0.072 H
D0.055 H
#7📜 EE Board October 1998
A 5 km long, three-phase line has a horizontal configuration of 4 ft spacing. The conductor is 336.4 MCM ACSR with GMR of 0.0244 ft and a resistance of 0.306 ohm per mile. What is the impedance?
A2.22 cis 65
B1.19 cis 46
C6.66 cis 65
D3.57 cis 46
#8
A 170-mile, 230-kV, 60-Hz, three-phase single-circuit transmission line uses a triangular arrangement with 20 ft, 20 ft, and 36 ft spacing respectively. If the line conductors have a GMR of 0.0217 ft, determine the capacitive susceptance to neutral per mile.
A\(4.81 \times 10^{-6}\text{ mho per mi}\)
B\(12.74 \times 10^{-6}\text{ mho per mi}\)
C\(7.92 \times 10^{-6}\text{ mho per mi}\)
D\(2.47 \times 10^{-6}\text{ mho per mi}\)
#9
A single-circuit, 3-phase, 60 Hz transmission is using a horizontal arrangement with a spacing distance of 4 m between adjacent conductors. If each conductor has an outside diameter of 0.8 cm, determine the capacitance to neutral per meter.
A352 pF/m
B7.793 pF/m
C7.42 pF/m
DNone of these
#10
A single-phase transmission line has total impedance of \(1.5 + j0.3\) ohms. It delivers 3 MW at 11 kV and at unity power factor. Determine the sending end voltage of the transmission lines.
A11.41 kV
B11.24 kV
C12.02 kV
D11.89 kV
#11
A single-phase transmission line has total impedance of \(5 \angle 60^\circ\) ohms and supplies a total load of 120 A, 3.3 kV and at 0.8 power factor lagging. Calculate the sending end voltage.
A3.93 kV
B3.62 kV
C3.54 kV
D3.86 kV
#12📜 EE Board April 1981
A 3-phase, 3-wire, short transmission line has a resistance of 3 ohms and a reactance of 8 ohms per wire. At the receiving end, a balanced 3-phase load draws a line current of 60 A, at 13,500 volts line to line, 0.90 power factor lagging. Determine the voltage at the sending end.
A14,156 V
B14,143 V
C14,230 V
D15,055 V
#13📜 EE Board October 1996
A load of 12 MVA, 0.8 pf lagging, 22 kV is served by a transmission line which has a line resistance of 3 ohms and a line reactance of 10 ohms. Solve for the sending end voltage.
A24,345 V
B26,795 V
C23,335 V
D25,422 V
#14📜 EE Board April 1982
A short 3-phase, 3-wire line has a resistance of 5 ohms and reactance of 12 ohms per wire and transmit power to a 3-phase load drawing 1000 kW at 13,120 volts line to line, 0.8 pf lagging, 60 Hz. Solve for the sending end voltage.
A14,200 V
B14,330 V
C14,130 V
D14,240 V
#15📜 EE Board April 1991
A 3-phase line has a reactance of 4.32 ohms and a resistance of 4.15 ohms. The load at the receiving end is 3800 kW at 75% power factor lagging and the voltage at the sending end is 36 kV. Determine the voltage at the receiving end.
A34.24 kV
B34.86 kV
C35.14 kV
D35.45 kV

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