Recent questions tagged line

asked May 22, 2020 by anonymous

State the limitations of EHVAC transmission line.

Last answer: Following are the Limitations of EHVAC Transmission: 1. Insulation cost increases as voltage increases 2. Skin effect is more 3. Proximity effect is more. 4. Corona loss increases. 5. Radio ... 18. EHVAC is economical only for bulk amount of power is to be transmitted over long distance.

0 like 0 dislike

80 views 1 answer

asked May 22, 2020 by anonymous

List the properties of line insulators in brief

Last answer: Following are the properties of line insulators: A) Electrical Properties of insulating material:- 1. It should have high resistance. 2. It should have high breakdown voltage. 3. It should have high ... of insulating material:- 1. It should have longer life. 2. It should have low cost

0 like 0 dislike

23 views 1 answer

asked May 22, 2020 by anonymous

State line parameters of transmission line.

Last answer: Following are the of Line parameters of transmission line: 1. Resistance 2. Inductance 3. Capacitance

0 like 0 dislike

32 views 1 answer

asked May 22, 2020 by anonymous

State the meaning of Single line diagram.

Last answer: Meaning of Single line diagram: The single line diagram of a power system is the network which shows the main connections and arrangement of the system components along with their data ( ... breakers, transformers, capacitors, bus bars, and conductors are shown by standardized schematic symbols.

0 like 0 dislike

34 views 1 answer

asked May 6, 2020 by anonymous

State the impact of inductance and resistance on transmission line performance

Last answer: Impact of inductance on transmission line: 1) It causes IXL drop in transmission line which affects regulation. 2) It is the only parameter which decides power transmission capacity of line i. ... is very small, it causes losses, temperature rise& poor voltage regulation so it cannot be neglected

0 like 0 dislike

84 views 1 answer

asked Jan 21, 2020 by Shubham

Why use phase modifiers in case of long transmission line

0 like 0 dislike

79 views 0 answers

asked Aug 25, 2019 by anonymous

effect of inductance and capacitance on performance of transmission line.

Last answer: Following are the effect on performance of transmission line: 1. Due to inductance (L) voltage drop in transmission line produces. 2. Capacitor (C) draws charging current ... , transmission line efficiency, voltage regulation & also power factor of transmission line gets affected.

1 like 0 dislike

77 views 1 answer

asked Aug 25, 2019 by anonymous

While calculating performance of medium transmission line, what assumptions are made in case of (i) Nominal 'T' Method (ii) Nominal 'TT' Method.

Last answer: (i) Assumptions are made in case of Nominal 'T' Method: a. It is assume that line capacitance is connected at center of transmission line. b. It is assume that half ... assumed that transmission line resistance & reactance per phase is connected in between two half transmission line capacitance

0 like 0 dislike

70 views 1 answer

asked Aug 25, 2019 by anonymous

requirements or properties of the line supports used in transmission and distribution.

Last answer: Following are requirements or properties of the line supports used in transmission and distribution. 1. High mechanical strength:- It should have high mechanical strength to withstand against - ... . 8. Appearance: It should have good appearance or They must be of pleasing shape

0 like 0 dislike

42 views 1 answer

asked Aug 25, 2019 by anonymous

HVDC transmission line in India:

Last answer: HVDC transmission line in India: S.N . From To Voltage 1 Rihand (U.P) (from 1990) Dadri +- 500 KV (bipolar) 2 Talcher- is the biggest ... (Chandrapur) Western Region 140KV 8 Connecting Southern region(Vizag- Gajuwaka) Eastern Region 140KV

0 like 0 dislike

74 views 1 answer

asked Aug 25, 2019 by anonymous

effect of line parameter on performance of transmission line.

Last answer: Following are the effect of line parameter on performance of transmission line: 1. Due to resistance (R), voltage drop in transmission line & copper losses in transmission line ... transmission line efficiency, voltage regulation & also power factor of transmission line gets affected.

0 like 0 dislike

45 views 1 answer

asked Aug 18, 2019 by anonymous

Why is transmission line 11kV, 33kV 66kV Not Is 10kV, 20kV, 30kV ?

Last answer: 10kv plus to compensate losses in olden days 1kv were added and transmitted. Since all equipment used for transmission have a multiple of 11 from olden days, still that is being followed even though the losses are ... voltages, multiples of 11 is eazy for winding ratios.. i.e. 11kv to 33kv is 1:3.

0 like 0 dislike

158 views 3 answers

asked Jul 24, 2019 by anonymous

Define line regulation and load regulation.

Last answer: Load regulation is the ability of the power supply to maintain its specified output voltage over changes in the load. Line regulation is the ability of the power supply to maintain its specified output voltage over changes in the input line voltage.

0 like 0 dislike

88 views 3 answers

asked Jun 29, 2019 by anonymous

Is the power line voltage available in our homes a dc or an ac voltage?

Last answer: The power line voltage available in our homes is AC. Mobile dwellings are the most commonly DC-supplied homes and even then they tend to include AC supply for heavier loads.

0 like 0 dislike

5.0k views 1 answer

asked Sep 5, 2018 by anonymous

Define load and line regulation.

Last answer: 1. Load regulation : The load regulation indicates how much the load voltage changes when the load current changes. The load regulation is defined as: % Load regulation = (VNL-VFL) / VFL *100 ... the power supply. A well-regulated power supply can have a line regulation of less than 0.1%.

0 like 0 dislike

47 views 1 answer

asked Aug 11, 2018 by anonymous

Write the relation between phase and line current, phase and line voltage for Star connection.

Last answer: Line voltage is equal to root three times of phase voltage and line and phase currents are equal in star connection

0 like 0 dislike

131 views 2 answers

asked Aug 11, 2018 by anonymous

What is line voltage and phase voltage?

What is line voltage and phase voltage? Draw balanced three phase star connected system. Show all the voltages and currents.

0 like 0 dislike

106 views 0 answers

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

0 like 0 dislike

240 views 1 answer

asked Jun 18, 2018 by anonymous

The command line interpreter that enables the users to interact with operating system is called the

The command line interpreter that enables the users to interact with operating system is called the A) Window B) Shell C) Process D) Kernel

Last answer: The command line interpreter that enables the users to interact with operating system is called the Shell

0 like 0 dislike

63 views 1 answer

asked May 8, 2018 by anonymous

Stability of a transmission line can be increased by

Last answer: Stability of a transmission line can be increased by Shunt capacitor, Series capacitor

0 like 0 dislike

260 views 1 answer

asked May 8, 2018 by anonymous

The sag of a transmission line is least affected by

The sag of a transmission line is least affected by (A) Self weight of the conductor. (B) Temperature of the surrounding air. (C) Current through the conductor. (D) Ice deposited on the conductor.

Last answer: The sag of a transmission line is least affected by Current through the conductor.

0 like 0 dislike

100 views 1 answer

asked May 8, 2018 by anonymous

Shunt compensation in an EHV line is used to

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.

Last answer: Shunt compensation in an EHV line is used to Improve the voltage profile.

0 like 0 dislike

4.1k views 1 answer

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

0 like 0 dislike

208 views 1 answer

asked May 8, 2018 by anonymous

For 11kV line the inductance per km per phase will be of the order of:

For 11kV line the inductance per km per phase will be of the order of: (A) 1 H (B) 0.1 H (C) 1 mH (D) 0.1 mH

Last answer: For 11kV line the inductance per km per phase will be of the order of: 1 mH

0 like 0 dislike

660 views 1 answer

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

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

0 like 0 dislike

359 views 1 answer

asked May 1, 2018 by anonymous

The surge impedance for over head line is taken as

The surge impedance for over head line is taken as (1) 10-20 ohms (2) 50-60 ohms (3) 100-200 ohms (4) 1000-2000 ohms

Last answer: The surge impedance for over head line is taken as 100-200 ohms

0 like 0 dislike

69 views 1 answer

asked Apr 30, 2018 by anonymous

For a short transmission line with r/x ratio of is 1.0, the regulation will be zero when the load power factor is

Last answer: For a short transmission line with r/x ratio of is 1.0, the regulation will be zero when the load power factor is 0.707 lead

0 like 0 dislike

128 views 1 answer

asked Apr 29, 2018 by anonymous

A transmission line of 200 km has a certain A, B, C and D parameters. If the length is reduced to 60 km

Last answer: A transmission line of 200 km has a certain A, B, C and D parameters. If the length is reduced to 60 km A increases, B decreases

0 like 0 dislike

91 views 1 answer

asked Apr 29, 2018 by anonymous

If an unsymmetrical line to ground fault occurs at the secondary terminals of a delta/star, ungrounded

If an unsymmetrical line to ground fault occurs at the secondary terminals of a delta/star, ungrounded transformer, then (A) zero sequence currents are present on both sides of the transformer (B) zero sequence currents are absent on both sides of the transformer (C) zero sequence currents are present on the secondary side but not on the primary side (D) zero sequence currents are present on the primary side but not on the secondary side

Last answer: If an unsymmetrical line to ground fault occurs at the secondary terminals of a delta/star, ungrounded transformer, then zero sequence currents are absent on both sides of the transformer

0 like 0 dislike

167 views 1 answer

asked Apr 29, 2018 by anonymous

A lightening arrester connected between the line and earth in a power system protects the terminal equipment

A lightening arrester connected between the line and earth in a power system (1) protects the terminal equipment against travelling surges (2) protects the transmission line against direct lightening strokes (3) suppresses high frequency oscillations in the line (4) reflects back the travelling wave approaching it

Last answer: A lightening arrester connected between the line and earth in a power system protects the terminal equipment against travelling surges

0 like 0 dislike

71 views 1 answer

asked Apr 29, 2018 by anonymous

Series capacitive compensation in EHV transmission line is used to

Last answer: To maintain voltage stability

0 like 0 dislike

338 views 2 answers

asked Apr 29, 2018 by anonymous

For a 500 Hz frequency excitation, a 50 km long power line will be modeled as

Last answer: For a 500 Hz frequency excitation, a 50 km long power line will be modeled as long line

0 like 0 dislike

2.6k views 1 answer

asked Apr 28, 2018 by anonymous

The line current in a balanced delta system is 30 A. The load current is

The line current in a balanced delta system is 30 A. The load current is (A) 30√3 A (B) 30/√3 A (C) 10 A (D) 30/√2 A

Last answer: The line current in a balanced delta system is 30 A. The load current is 30/√3 A

0 like 0 dislike

62 views 1 answer

asked Apr 28, 2018 by anonymous

The ALE line of an 8085 microprocessor is used to

The ALE line of an 8085 microprocessor is used to (A) latch the output of an I/O instruction into an external latch. (B) deactivate the chip-select signal from memory devices. (C) find the interrupt enable states of the TRAP interrupt. (D) latch the 8 bits of address lines AD7-AD0 into an external latch.

Last answer: The ALE line of an 8085 microprocessor is used to latch the 8 bits of address lines AD7-AD0 into an external latch.

0 like 0 dislike

113 views 1 answer

asked Apr 28, 2018 by anonymous

The sending end and receiving end voltages of a three-phase transmission line are 10 kV/ph and 9.5 kV/ph,

The sending end and receiving end voltages of a three-phase transmission line are 10 kV/ph and 9.5 kV/ph, respectively. If the resistance drop is 150 V/ph and receiving end power factor is 0.8, the sending end power factor is (A) 0.745 lagging (B) 0.775 lagging (C) 0.8 lagging (D) 0.85 lagging

Last answer: Vscos¢s-Vrcos¢r=IR

0 like 0 dislike

2.9k views 2 answers

asked Apr 27, 2018 by anonymous

The reactive power transfer over a line mainly depends on

Last answer: The reactive power transfer over a line mainly depends on lVsl- lVRl

0 like 0 dislike

284 views 1 answer

asked Apr 26, 2018 by anonymous

The unit circle of the Nyquist plot transforms into unity or 0 dB line of the amplitude plot of the Bode diagram for

Last answer: The unit circle of the Nyquist plot transforms into unity or 0 dB line of the amplitude plot of the Bode diagram for all frequencies

0 like 0 dislike

155 views 1 answer

asked Apr 26, 2018 by anonymous

lf a travelling-wave travelling along a loss-less overhead line does not result in any reflection after it has

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

Last answer: 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 terminated into a resistance equal to surge impedance of the line

0 like 0 dislike

66 views 1 answer

asked Apr 26, 2018 by anonymous

Transmission efficiency of a transmission line increases with the

Last answer: Transmission efficiency of a transmission line increases with the increase in power factor and voltage

0 like 0 dislike

67 views 1 answer

asked Mar 25, 2018 by anonymous

Pure inductive circuit takes power from the A.C. line when?

Last answer: It takes power when voltage decreases and current increases.

0 like 0 dislike

898 views 2 answers

asked Mar 22, 2018 by anonymous

In main line service as compared to urban and suburban service?

Last answer: In main line service as compared to urban and suburban service distance between the stops is more, maximum speed reached is high, acceleration and retardation rates are low.

0 like 0 dislike

48 views 1 answer