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The input impedance of a short circuited loss less transmission line of characteristic impedance 50 Ohm is

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The input impedance of a short circuited loss less transmission line of characteristic impedance 50 Ohm is may be capacitive or inductive depending on the length of the line

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1 answer 18 views

The magnitude of the open-circuit and short circuit input impedance of a transmission line are 100 ohm and 25 ohm respectively. The characteristic impedance of line is:  (1) 25 ohm (2) 50 ohm (3) 75 ohm (4) 100 ohm

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For a transmission line open circuit and short circuit impedances are 20 Ω and 5 Ω. Then characteristic impedance is: (1) 100 Ω (2) 50 Ω (3) 25 Ω (4) 10 Ω

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A 10 km long line has a characteristic impedance of 400 ohms. If line length is 100 km, the characteristic impedance is: (1) 4000 Ω (2) 400 Ω (3) 40 Ω (4) 4 Ω

asked May 28, 2018 in Electric Power Transmission by Shimroz123
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When an antenna of input resistance 73 ohm is connected to a 50-ohm line and if the losses are ignored then its efficiency will be nearly   (A) 0.19 (B) 0.81 (C) 0.97 (D) 1.19

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The corona loss of a 3-phase transmission line is 100 kW at 60 kV/phase and 25 kW at 50 kV/phase. The disruptive critical voltage is (A) 40 kV (B) 43.6 kV (C) 49.6 kV (D) 50 kV

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asked May 3, 2018 in Electric Power Transmission by Shimroz123
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The power loss in a transmission line depends on (a) current in the line. (b) resistance of the line. (c) length of the line. (d) All of the above 

asked May 26, 2018 in Electric Power Transmission by Shimroz123
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asked Jun 17, 2018 in Electrical Engineering by Shimroz123
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asked May 22, 2018 in Electric Power Transmission by Shimroz123
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The lossless line of characteristics impedance 300 Ohm is terminated in a pure resistance of 200 Ohm. The value of the standing wave ratio is  (a) 1.5 (b) 0.67 (c) 1.0 (d) 1.25

asked May 16, 2018 in Electronics Engineering by Shimroz123
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If the RF transmission is terminated in its Characteristic impedance Z, which of the following statements is wrong : a. The input impedance of transmission line becomes Zc. b. The transmission line acts as an infinite long transmission line. c. The VSWR becomes one d. The VSWR becomes infinite

asked Apr 12, 2018 in Electronics Engineering by Shimroz123
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If diameter of each conductor of a transmission line is ‘d’, then the diameter of n-layer stranded conductor will be (a) (2n – 1) d (b) (2n + 1) d (c) (3n – 1) d (d) (3n + 1) d 

asked May 26, 2018 in Electric Power Transmission by Shimroz123
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A 50Ω transmission line is terminated in an impedance of 20-j50. What will be the reflection coefficient? A) 0.69 B) 1.69 C) 6.9 D) 16.9 

asked Jun 18, 2018 in Electrical Engineering by Shimroz123
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asked Apr 14, 2018 in Electrical Engineering by Shimroz123
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A 100 km long transmission line is loaded at 110 kV.if the loss of line is 5 MW and the load is 150 MVA, the resistance of the line is?

asked Mar 27, 2018 in Power system by Shimroz123
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The ratio of air-gap line voltage from open-circuit characteristic and armature current from short-circuit characteristic for a particular value of the field current in a synchronous generator is (A) synchronous reactance (B) synchronous impedance (C) unsaturated synchronous reactance (D) unsaturated synchronous impedance 

asked Jun 4, 2018 in Synchronous machine by Shimroz123
1 answer 25 views

lf a travelling-wave travelling along a loss-less overhead line does not result in any reflection after it has reached the far end, then the far end of the line is

asked Apr 26, 2018 in Switchgear And Protection by Shimroz123
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A 220 kV, 3 phase transmission line is 60 km long. The resistance is 0.15 ohm / km and the inductance is 1.4 mH / km. Use the short line model to find the power at the sending end when the line is supplying a three phase load of 300 MVA at 0.8 pf lagging at 220 kV.  (A) 5.58MW (B) 80MW (C) 85.58MW (D) 74.42 MW 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 27 views

The inductance of a power transmission line increases with (A) decrease in line length. (B) increase in conductor diameter. (C) increase in spacing between phase conductors. (D) increase in load current carried by conductors.

asked May 13, 2018 in Electric Power Transmission by Shimroz123
0 answers 16 views

A transmission line to be reciprocal, the condition is (a) A = D (b) AC – BD = 1 (c) AD – BC = 1 (d) AB – CD = 1  

asked May 25, 2018 in Electric Power Transmission by Shimroz123
1 answer 12 views

When the load on a transmission line is equal to the surge impedance loading  (a) The receiving end voltage is less than the sending end voltage  (b) The sending end voltage is less than the receiving end voltage  (c) The receiving end voltage is more than the sending end voltage  (d) The receiving end voltage equal to the sending end voltage 

asked May 13, 2018 in Electrical Engineering by Shimroz123
0 answers 37 views

A balanced Delta connected load supplied with 440 V 50 Hz three phase AC supply has R=10 Ohm and L=0.6 mH in is each arm. Calculate line and phase current, active power.

asked Aug 12, 2018 in Basic electrical and electronics engineering by Quiz
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In an AC transmission line difference in phase of voltage at two ends of the line is due to (a) System voltage (b) Insulators (c) Resistance of line (d) Reactance of line

asked May 26, 2018 in Electric Power Transmission by Shimroz123
0 answers 26 views

Which of the following relations is true for long transmission line ? (a) VS = AVR – BIR (b) VS = BVR + AIR (c) VS = AVR + BIR (d) VS = BVR – AIR

asked May 26, 2018 in Electric Power Transmission by Shimroz123
0 answers 25 views

Which of the following is used for power factor improvement in transmission line ? (a) Three phase induction (b) An overexcited three phase synchronous motor running on no load (c) Three phase AC series motor (d) Choke

asked May 26, 2018 in Electric Power Transmission by Shimroz123
1 answer 20 views

What type of insulator will be used if the direction of the transmission line is to be changed?

asked May 22, 2018 in Electric Power Transmission by Shimroz123
1 answer 17 views

A long overhead transmission line is terminated by its characteristic impedance. Under this operating condition, the ratio of the voltage to the current at different points along the line will?

asked Mar 27, 2018 in Power system by Shimroz123
1 answer 18 views

Surge impedance of overhead transmission line is normally in the order of (a) 1- 5 ohms (c) 300 - 500 ohms (b) 20 - 30 ohms (d) 300000 - 500000 ohms

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
0 answers 12 views

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 mF/km per phase. Assume a loss less line. Determine the line wavelength (a line phase constant).  (A) 1250 km (B) 6578 km (C) 4990 km (D) 2445 km 

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1 answer 23 views

The secondary of a current transformer is always short-circuited under operating conditions because it?

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 26 views

To increase power transfer capability of a long transmission line, we should:  (1) Increase line resistance (2) Increase transmission voltage (3) Decrease line reactance (4) Both (2) & (3)

asked May 22, 2018 in Electric Power Transmission by Shimroz123
1 answer 30 views

Stability of a transmission line can be increased by

asked May 8, 2018 in Electric Power Transmission by Shimroz123
1 answer 32 views

The impedance Z offered by transmission line for a travelling wave which damps out the low frequency oscillation rapidly is also called

asked Apr 23, 2018 in Electrical Engineering by Shimroz123
0 answers 40 views

Effect of increase in temperature in an overhead transmission line is (a) to increase stress and length both (b) to decrease stress and length both (c) to decrease stress and increase length (d) None of the above 

asked May 26, 2018 in Electric Power Transmission by Shimroz123
0 answers 85 views

The presence of earth in case of overhead transmission line (a) increases capacitance (b) increases inductance (c) decreases capacitance (d) decreases inductance

asked May 26, 2018 in Electric Power Transmission by Shimroz123
1 answer 20 views

Why are shunt reactors connected at the receiving end of long transmission line system: (1) To increase the terminal voltage (2) To compensate voltage rise caused by capacitive charging at light load (3) To improve power factor (4) None of these

asked May 22, 2018 in Electric Power Transmission by Shimroz123
1 answer 37 views

The inductance of single phase two wire power transmission line per km gets doubled when the  (a) Distance between wires is doubled  (b) Distance between the wires is increased four fold  (c) Distance between the wires is increased as square of the original distance  (d) Radius of the wire is doubled

asked May 13, 2018 in Electric Power Transmission by Shimroz123
1 answer 379 views

The main consideration for operating transmission line at high voltage is (a) to increase efficiency only. (b) to reduce power loss only. (c) to increase power transmission capability only. (d) All of the above

asked May 26, 2018 in Electric Power Transmission by Shimroz123
1 answer 22 views

Earth wire on EHV overhead transmission line is provided to protect the line against:

asked May 22, 2018 in Electric Power Transmission by Shimroz123
1 answer 79 views

how the booster is connected in transmission line ?

asked Aug 18, 2017 in Electric Power Transmission by Zeeshan

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