Electrical Engineering · Question Bank

Transmission Lines

168 questions · page 6 of 9. Answer in your head first, then check the solution.

📘 EE Mock Board Exam

#101📜 EE Pre-Board March 2018📘 PowerhouseEasy

In a 3 core cable, the capacitance between two conductors is 3 μF. What will be the capacitance per phase?

A1.5 μF

B3 μF

C6 μF

D12 μF

#102📜 EE Pre-Board March 2018📘 PowerhouseHard

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. If the line conductors have a radius of 0.0217 ft, determine the capacitive susceptance to neutral per mile.

A\(4.81 \times 10^{-6}\) mho per mile

B\(12.74 \times 10^{-8}\) mho per mile

C\(7.92 \times 10^{-6}\) mho per mile

D\(2.47 \times 10^{-6}\) mho per mile

#103📜 EE Pre-Board March 2018📘 PowerhouseMedium

A balanced 6,600-volt, 3-phase, 3-wire, 60 Hz transmission line is designed to transmit power to a 450 kVA inductive load at 0.8 power factor. The line has a resistance of 3.5 ohms and a reactance of 10.5 ohms per wire. Find the voltage regulation of the line.

A7.6%

B5.6%

C9.6%

D11.6%

#104📜 EE Pre-Board March 2018📘 PowerhouseMedium

A balanced Y-connected load of (300 + j100) Ω is supplied by a 3-phase line 40 km long with an impedance of (0.6 + j0.7) Ω per km (line to neutral). Find the voltage at the receiving end when the voltage at the sending end is 66 kV.

A60 kV

B62 kV

C58 kV

D64 kV

#105📜 EE Pre-Board March 2018📘 PowerhouseEasy

A 100 km transmission line has a 1,200 ohms shunt reactance. What is the shunt reactance per km?

A1,200 Ω

B120,000 Ω

C12 Ω

D120 Ω

#106📜 EE Pre-Board August 2018📘 PowerhouseEasy

Which of the following parameters can be neglected for a short line?

Aresistance

Binductance

Creactance

Dcapacitance

#107📜 EE Pre-Board August 2018📘 PowerhouseEasy

Which of the following insulators will be selected for high voltage application?

Astrain type

Bdisc type

Csuspension type

Dpin type

#108📜 EE Pre-Board August 2018📘 PowerhouseEasy

If the effect of earth is taken into account, then the capacitance of line to ground

Adecreases

Bincreases

Cremains unchanged

Dbecomes infinite

#109📜 EE Pre-Board August 2018📘 PowerhouseEasy

The effective resistance of conductor is increased by

Askin effect

Bproximity effect

Ccorona effect

Dboth skin effect and proximity effect

#110📜 EE Pre-Board August 2018📘 PowerhouseEasy

The surge impedance of a transmission line is given by

A\(\sqrt{C/L}\)

B\(\sqrt{LC}\)

C\(1/\sqrt{LC}\)

D\(\sqrt{L/C}\)

#111📜 EE Pre-Board August 2018📘 PowerhouseEasy

A two terminal pair of network of a transmission line can be represented by a

Aπ-network

BT-network

Ceither π or T

Dtree network

#112📜 EE Pre-Board August 2018📘 PowerhouseEasy

An ACSR conductor has (n-1) layers around its single center strand, the total number of strands will be

A\(3n^2 + 3n + 1\)

B\(3n^2 - 3n - 1\)

C\(3n^2 + 3n - 1\)

D\(3n^2 - 3n + 1\)

#113📜 EE Pre-Board August 2018📘 PowerhouseMedium

A single-phase, 10-km transmission line has 16.65 mH total inductance. If the distance between the conductors is 1 m, what is the conductor radius?

A2 cm

B1.5 cm

C1 cm

D0.75 cm

#114📜 EE Pre-Board August 2018📘 PowerhouseEasy

The effect of corona is

Aincreased reactance

Bincreased inductance

CIncreased energy loss

Dall of these

#115📜 EE Pre-Board August 2018📘 PowerhouseHard

A single-phase transmission line having a length of 15 miles is composed of two copper conductors spaced 7 ft apart having a diameter of 0.575 inch. Determine the line to line capacitance in farad if the system frequency is 60 Hz.

A\(4.9 \times 10^{-12}\)

B\(9.8 \times 10^{-12}\)

C\(11.8 \times 10^{-9}\)

D\(118 \times 10^{-9}\)

#116📜 EE Pre-Board August 2018📘 PowerhouseMedium

A power station supplies 60 kW to a load over 2,500 ft of 000, 2-conductor copper feeder, the resistance of which is 0.078 ohm per 1,000 ft. The bus-bar voltage is maintained constant at 600 volts. Determine the maximum power which can be transmitted.

A60 KW

B230.7 KW

C120 KW

D150 KW

#117📜 EE Pre-Board August 2018📘 PowerhouseMedium

A 3-phase transmission line has two aluminum conductors per bundle. The self GMD of each conductor is 8.90 mm, the distance between the conductors of a bundle is 40 cm and the distance between phases is 9 m. What is the inductance of the line per phase?

A1 μH/m

B2 μH/m

C3 μH/m

D4 μH/m

#118📘 EE Pocket Reviewer RojasEasy

During “load shedding” what will happen?

AFeeder loads are recomputed and distributed properly to the three lines

BLoad power factor is corrected using capacitors

CSome loads are being switched off

DSome loads are transferred to another feeder

#119📘 EE Pocket Reviewer RojasEasy

Which of the following is not the voltage at which power is usually transmitted?

A20 kV

B33 kV

C66 kV

D132 kV

#120📘 EE Pocket Reviewer RojasEasy

Bus bars are rated according to which of the following parameters?

ACurrent only

BCurrent and voltage

CCurrent, voltage and frequency

DCurrent, voltage, frequency and short time current

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