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how the booster is connected in transmission line ?
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Aug 18, 2017
by
anonymous
how the booster is connected in transmission line ?
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Aug 20, 2017
by
anonymous
Booster is connected in series with transmission line
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asked
May 8, 2018
by
anonymous
In a transmission line if booster transformers are to be used, preferred location will be
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
Last answer:
In a transmission line if booster transformers are to be used, preferred location will be At the intermediate point
transmission
line
booster
transformers
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asked
May 22, 2018
by
anonymous
Why are shunt reactors connected at the receiving end of long transmission line system:
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
Last answer:
Why are shunt reactors connected at the receiving end of long transmission line system: To compensate voltage rise caused by capacitive charging at light load
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asked
Dec 5, 2017
by
anonymous
How many insulator disc used for 33 kV transmission voltage line?
How many insulator disc used for 33 kV transmission voltage line?
Last answer:
5,As 33kv is Vrms
transmission
insulator
discs
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asked
May 26, 2018
by
anonymous
In an AC transmission line difference in phase of voltage at two ends of the line is due to
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
Last answer:
reactance of line
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asked
May 26, 2018
by
anonymous
Which of the following is used for power factor improvement in transmission line ?
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
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asked
May 26, 2018
by
anonymous
Effect of increase in temperature in an overhead transmission line is
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
Last answer:
D
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asked
May 26, 2018
by
anonymous
The bundled conductor in EHV transmission line system provides
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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asked
May 26, 2018
by
anonymous
The power loss in a transmission line depends on
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
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asked
May 26, 2018
by
anonymous
The presence of earth in case of overhead transmission line
The presence of earth in case of overhead transmission line (a) increases capacitance (b) increases inductance (c) decreases capacitance (d) decreases inductance
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asked
May 13, 2018
by
anonymous
Galloping in transmission line conductors arises generally due to
Galloping in transmission line conductors arises generally due to - (A) asymmetrical layer of ice formation (B) vortex phenomenon in light winds (C) heavy weight of line conductors (D) adoption of horizontal conductor
Last answer:
D
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asked
Oct 14, 2018
by
anonymous
why there is a difference between the insulation on the beginning and end of transmission line ?
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asked
May 26, 2018
by
anonymous
Which of the following relations is true for long transmission line ?
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
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asked
May 26, 2018
by
anonymous
If diameter of each conductor of a transmission line is ‘d’, then the diameter of n-layer stranded conductor
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
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asked
May 26, 2018
by
anonymous
The main consideration for operating transmission line at high voltage is
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
Last answer:
to reduce power loss: this is because when power is generated, it is generated at a very low voltage but because it is going to be transported over a long distance it is needed to be increase in order to avoid losses on the way such as copper loss and Eddy loss.
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asked
May 25, 2018
by
anonymous
A transmission line to be reciprocal, the condition is
A transmission line to be reciprocal, the condition is (a) A = D (b) AC – BD = 1 (c) AD – BC = 1 (d) AB – CD = 1
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asked
May 25, 2018
by
anonymous
An overhead transmission line has a span of 260 m. The weight of the conductor is 0.68 kg/m. The maximum
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
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asked
May 23, 2018
by
anonymous
The input impedance of a short circuited loss less transmission line of characteristic impedance 50 Ohm is
The input impedance of a short circuited loss less transmission line of characteristic impedance 50 Ohm is
Last answer:
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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asked
May 22, 2018
by
anonymous
What type of insulator will be used if the direction of the transmission line is to be changed?
What type of insulator will be used if the direction of the transmission line is to be changed?
Last answer:
Suspension type of insulator will be used if the direction of the transmission line is to be changed.
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asked
May 22, 2018
by
anonymous
Earth wire on EHV overhead transmission line is provided to protect the line against:
Earth wire on EHV overhead transmission line is provided to protect the line against:
Last answer:
Earth wire on EHV overhead transmission line is provided to protect the line against: lightening surge
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asked
May 22, 2018
by
anonymous
In case of a ‘High Voltage DC’ transmission, how many minimum conductors are required?
In case of a ‘High Voltage DC’ transmission, how many minimum conductors are required?
Last answer:
In case of a ‘High Voltage DC’ transmission, how many minimum conductors are required? one
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asked
May 13, 2018
by
anonymous
The inductance of single phase two wire power transmission line per km gets doubled when the
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
Last answer:
The inductance of single phase two wire power transmission line per km gets doubled when the Distance between the wires is increased as square of the original distance
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asked
May 13, 2018
by
anonymous
The inductance of a power transmission line increases with
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.
Last answer:
The inductance of a power transmission line increases with increase in spacing between phase conductors.
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528
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1
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asked
Jun 4, 2018
by
anonymous
A long transmission line has considerable ……………….. effect.
A long transmission line has considerable ……………….. effect. A) series capacitance B) shunt capacitance C) series inductance D) shunt inductance
Last answer:
Shunt Capacitance.
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2
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asked
Jun 4, 2018
by
anonymous
A single-line-to-ground fault on a overhead transmission line creates
A single-line-to-ground fault on a overhead transmission line creates (A) voltage sag (B) voltage swell (C) over voltage (D) voltage flicker
Last answer:
Creates overvoltage.
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asked
May 29, 2018
by
anonymous
For a transmission line open circuit and short circuit impedances are 20 Ω and 5 Ω. Then characteristic
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
Last answer:
For a transmission line open circuit and short circuit impedances are 20 Ω and 5 Ω. Then characteristic impedance is: 10 Ω
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1
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asked
May 22, 2018
by
anonymous
To increase power transfer capability of a long transmission line, we should:
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)
Last answer:
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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1
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asked
May 8, 2018
by
anonymous
Stability of a transmission line can be increased by
Stability of a transmission line can be increased by
Last answer:
Stability of a transmission line can be increased by Shunt capacitor, Series capacitor
stability
transmission
line
increased
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asked
May 3, 2018
by
anonymous
A transmission line has 1 P.0 impedance on a base of 11 KV, 100 MVA. On a base of 55 KV. it will have a P.0 impedance of
A transmission line has 1 P.0 impedance on a base of 11 KV, 100 MVA. On a base of 55 KV. it will have a P.0 impedance of
Last answer:
A transmission line has 1 P.0 impedance on a base of 11 KV, 100 MVA. On a base of 55 KV. it will have a P.0 impedance of 0.02 P.U
transmission
line
impedance
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1
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asked
May 25, 2018
by
anonymous
A 20-MVA, 6.6-kV, 3-phase alternator is connected to a 3-phase transmission line. The per unit
A 20-MVA, 6.6-kV, 3-phase alternator is connected to a 3-phase transmission line. The per unit positive-sequence, negative-sequence and zero-sequence impedances of the alternator are j0.1, j0.1 and j0.04 respectively. The neutral of the alternator is connected to ground through an inductive reactor of j0.05 p.u. The per unit positive-, ... The voltage of the alternator neutral with respect to ground during the fault is (A) 513.8 V (B) 889.9 V (C) 1112.0 V (D) 642.2 V
Last answer:
A 20-MVA, 6.6-kV, 3-phase alternator is connected to a 3-phase transmission line. The per unit positive-sequence, negative-sequence and zero-sequence impedances of the alternator are j0.1, ... line. The voltage of the alternator neutral with respect to ground during the fault is 642.2 V
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asked
May 25, 2018
by
anonymous
A generator is connected through a 20 MVA, 13.8/138 kV step down transformer, to a transmission line.
A generator is connected through a 20 MVA, 13.8/138 kV step down transformer, to a transmission line. At the receiving end of the line a load is supplied through a step down transformer of 10 MVA, 138/69 kV rating. A 0.72 pu. load, evaluated on load side transformer ratings as base values , is supplied from the above system. For system base values of 10 MVA and 69 kV in load circuit, the value of the load (in per unit) in generator will be (A) 36 (B) 1.44 (C) 0.72 (D) 0.18
Last answer:
A generator is connected through a 20 MVA, 13.8/138 kV step down transformer, to a transmission line. At the receiving end of the line a load is supplied through a step down transformer of 10 MVA, 138/ ... MVA and 69 kV in load circuit, the value of the load (in per unit) in generator will be 36
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1
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asked
May 8, 2018
by
anonymous
In case the height of transmission tower is increased, which of the following parameter is likely to change?
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
Last answer:
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
transmission
tower
parameter
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1
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asked
May 1, 2018
by
anonymous
The purpose of guard ring in transmission lines is to
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
Last answer:
The purpose of guard ring in transmission lines is to reduce the earth capacitance of the lowest unit.
guard
ring
transmission
lines
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asked
May 26, 2018
by
anonymous
In long AC transmission lines, the receiving end voltage becomes greater than sending end voltage at light
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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asked
May 8, 2018
by
anonymous
In which of the following transmission lines, the value of the Shunt admittance should be
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
Last answer:
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
transmission
lines
shunt
admittance
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asked
Aug 18, 2017
by
anonymous
why we use aluminium conductor and not copper in transmission lines ?
why we use aluminium conductor and not copper in transmission lines ?
Last answer:
Because copper conductor are costlier than aluminium conductor
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asked
May 8, 2018
by
anonymous
If 3000 kW power is to be transmitted over a distance of 30 km, the desirable transmission voltage will be.
If 3000 kW power is to be transmitted over a distance of 30 km, the desirable transmission voltage will be. (A) 11 kV (B) 33 kV (C) 66 kV (D) 132 kV
Last answer:
By
transmission
voltage
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asked
May 26, 2018
by
anonymous
The connected load of a consumer is 2 kW and his maximum demand is 1.5 kW. The load factor of the
The connected load of a consumer is 2 kW and his maximum demand is 1.5 kW. The load factor of the consumer is (a) 0.375 (b) 0.75 (c) 1.33 (d) None of these
Last answer:
D
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asked
May 28, 2018
by
anonymous
A 10 km long line has a characteristic impedance of 400 ohms. If line length is 100 km, the characteristic
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
Last answer:
A 10 km long line has a characteristic impedance of 400 ohms. If line length is 100 km, the characteristic impedance is: 400 Ω
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asked
May 13, 2018
by
anonymous
Transmission of power by a.c. cables is impossible beyond
Transmission of power by a.c. cables is impossible beyond (a) 500 km (b) 300 km (c) 250 km (d) 45 km
Last answer:
D
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2
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asked
May 22, 2018
by
anonymous
Consider the following statements: Over head transmission lines are provided with earth wires:
Consider the following statements: Over head transmission lines are provided with earth wires: 1 . To protect the transmission line from direct lightning strike 2. To protect the transmission line insulation from the indirect lightning strike 3. To balance the line currents 4. To provide path for neutral current Which of these statement/s is/are correct? (1) 1 and 3 (2) 1 and 4 (3) 1 only (4) 2 on|y
Last answer:
Consider the following statements: Over head transmission lines are provided with earth wires: 1 . To protect the transmission line from direct lightning strike 2. To protect the transmission line insulation from the indirect lightning ... (1) 1 and 3 (2) 1 and 4 (3) 1 only (4) 2 on|y
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asked
May 25, 2018
by
anonymous
Shielding angle of an EHV line is about
Shielding angle of an EHV line is about (a) 20° (b) 50° (c) 70° (d) 90°
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asked
Jun 18, 2018
by
anonymous
A 50Ω transmission line is terminated in an impedance of 20-j50. What will be the reflection coefficient?
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
Last answer:
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
transmission
line
terminated
impedance
reflection
coefficient
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asked
May 25, 2018
by
anonymous
For enhancing the power transmission in along EHV transmission line, the most preferred method is to
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
Last answer:
For enhancing the power transmission in along EHV transmission line, the most preferred method is to connect a Series capacitive compensator in the line
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asked
Apr 25, 2018
by
anonymous
Surge impedance of overhead transmission line is normally in the order of
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
Last answer:
Surge impedance of overhead transmission line is normally in the order of 300 - 500 ohms
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asked
Apr 10, 2018
by
anonymous
In terms of cost, overhead transmission line is better than underground transmission line in the field of
In terms of cost, overhead transmission line is better than underground transmission line in the field of (a) Insulation (b) Right of way (c) Visibility (d) None of these
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asked
Apr 9, 2018
by
anonymous
The effect of corona in high voltage a.c. transmission line is ...
The effect of corona in high voltage a.c. transmission line is A) Increased energy loss in the transmission line B) Increased line reactance C) Increased line to line capacitance D) All of the above
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asked
May 24, 2018
by
anonymous
The capacitor connected in series with the line is used to
The capacitor connected in series with the line is used to A) enhance power factor B) enhance power system capability C) decrease the losses D) decrease the power transfer
Last answer:
The capacitor connected in series with the line is used to enhance power system capability
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asked
May 20, 2018
by
anonymous
As shown in the figure, 1 ohm resistance is connected across a source that has a load line v + i = 100.
Last answer:
As shown in the figure, 1 ohm resistance is connected across a source that has a load line v + i = 100. The current through the resistance is 50 A
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asked
May 15, 2018
by
anonymous
In a Y-connected circuit, the magnitude of each line current is?
In a Y-connected circuit, the magnitude of each line current is? A.one-third the phase current B.three times the corresponding phase current C.equal to the corresponding phase current D.zero
Last answer:
In a Y-connected circuit, the magnitude of each line current is? A.one-third the phase current B.three times the corresponding phase current C.equal to the corresponding phase current D.zero
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Apr 12, 2018
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anonymous
In a Y -connected circuit, between each line -voltage and the nearest phase - voltage, there is a phase -angle of:
In a Y -connected circuit, between each line -voltage and the nearest phase - voltage, there is a phase -angle of: A. 0° B. 30° C. 60° D. 120°
Last answer:
B
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