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The bundled conductor in EHV transmission line system provides (a) increased inductance (b) reduced capacitance (c) increased capacitance (d) increased voltage gradient

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

asked May 22, 2018 in Electric Power Transmission by Shimroz123
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An overhead transmission line has a span of 260 m. The weight of the conductor is 0.68 kg/m. The maximum allowable tension in the line is 1550 kg. Maximum sag of the line should be (a) 5.8 m (b) 4.6 m (c) 2.7 m (d) 3.7 m 

asked May 25, 2018 in Electric Power Transmission by Shimroz123
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For enhancing the power transmission in along EHV transmission line, the most preferred method is to connect a  (A) Series inductive compensator in the line (B) Shunt inductive compensator at the receiving end (C) Series capacitive compensator in the line (D) Shunt capacitive compensator at the sending end

asked May 25, 2018 in Power system by Shimroz123
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asked May 22, 2018 in Electric Power Transmission by Shimroz123
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asked Apr 29, 2018 in Power system by Shimroz123
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why we use aluminium conductor and not copper in transmission lines ?

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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
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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
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asked May 26, 2018 in Electric Power Transmission by Shimroz123
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asked May 26, 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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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
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asked May 13, 2018 in Electric Power Transmission by Shimroz123
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In a transmission line if booster transformers are to be used, preferred location will be  (A) At the receiving end (B) At the sending end (C) At the intermediate point (D) Anywhere in the line 

asked May 8, 2018 in Electric Power Transmission by Shimroz123
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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
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asked May 26, 2018 in Electric Power Transmission by Shimroz123
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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
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Bundled conductors are mainly used in high voltage overhead transmission lines to (a) Reduce line loss (c) Reduce corona (b) Reduce harmonics (d) Increase strength

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
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A Transmission line conductor has been suspended freely from two towers and has taken the form of a catenary that has c = 487.68m. The span between the two towers is 152 m, and the weight of the conductor is 1160 kg/km. Calculate the length of the conductor.  (A) 487.68 m (B) 152.614 m (C) 5.934 m (D) 11.9 m 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
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The line conductor of a transmission line has an overall diameter of 19.53 mm, weight 0.844 kg/m and an ultimate breaking strength of 7950 kg. If the factor of safety is to be 2, when conductor has an ice of 1 kg/m and a horizontal wind pressure of 1.5 kg/m. What is the vertical sag, corresponding to this loading for a 300 m span level supports?

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asked Jun 4, 2018 in Electric Power Transmission by Shimroz123
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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

asked May 29, 2018 in Electric Power Transmission by Shimroz123
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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)

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A transmission line conductor at a river crossing is supported from two towers at height. of 30 m and 90m, above water level. The horizontal distance between the towers is 270m, if the tension in the conductor is 1800 kg and the conductor weight 1 kg/m. What is the clearance between the conductor and the water at a point midway between the towers?

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Shunt compensation in an EHV line is used to (A) Improve stability. (B) Improve the voltage profile. (C) Reduce the fault level. (D) Substitute for synchronous phase modifier.

asked May 8, 2018 in Power system by Shimroz123
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Choose two appropriate auxiliary components of a HVDC transmission system from the following P. D.C line inductor Q. A.C line inductor R. Reactive power sources S. Distance relays on D.C line T. Series capacitance on A.C. line  (A) P and Q (B) P and R (C) Q and S (D) S and T

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In long AC transmission lines, the receiving end voltage becomes greater than sending end voltage at light load or no load operation. This is due to (a) Ferranti effect (b) Skin effect (c) Proximity effect (d) Corona effect 

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In which of the following transmission lines, the value of the Shunt admittance should be approximated to zero ? (A) A 66 kV 35 km long line (B) A 132 kV 200 km long line (C) A 220 kV 300 km long line (D) A 400 kV 500 km long line

asked May 8, 2018 in Electric Power Transmission by Shimroz123
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In case the height of transmission tower is increased, which of the following parameter is likely to change?  (A) Resistance (B) Inductance (C) Capacitance (D) None of the above

asked May 8, 2018 in Electric Power Transmission by Shimroz123
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The purpose of guard ring in transmission lines is to  (1) reduce the earth capacitance of the lowest unit. (2) increase the earth capacitance of the lowest unit. (3) reduce the transmission lines losses. (4) reduce the reactance of the line

asked May 1, 2018 in Electric Power Transmission by Shimroz123
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The economic size of a conductor in transmission and distribution lines of electric power is decided by (a) Ohm’s law (b) Kelvin’s law (c) Kirchhoff’s law(d) Faraday’s law 

asked May 26, 2018 in Alternator by Shimroz123
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HVDC transmission is preferred to EHV AC because  (a) HVDC terminal equipments are inexpensive  (b) VAR compensation is not required in HVDC systems  (c) System stability can be improved  (d) Harmonic problem is avoided 

asked May 13, 2018 in Electrical Engineering by Shimroz123
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asked May 22, 2018 in Electric Power Transmission by Shimroz123
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A 3 layer, total diameter of an ACSR conductor is 5 cm. Find the diameter of each strand?

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asked May 22, 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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A single phase transmission line and a telephone line are both symmetrically strung one below the other, in horizontal configurations, on a common tower, The shortest and longest distances between the phase and telephone conductors are 2.5 m and 3 m respectively. The voltage (volt/km) induced in the telephone circuit, due to 50 Hz current of 100 amps in the power circuit is (A) 4.81 (B) 3.56 (C) 2.29 (D) 1.27

asked May 25, 2018 in Power system by Shimroz123
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For a fixed value of complex power flow in a transmission line having a sending and voltage V, the real power loss will be proportional to  A) V B) v2 C) 1/V2 D)1/V

asked May 20, 2018 in Power system by Shimroz123

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