Why is AC better for long distance power transmission than DC ?
Last Answer : ac is more economical to transmit for long distances . wires can be made smaller by step up transformer .. since major cost are wires to transmit .. then at the end of distance step down transformer is used for commercial use.
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211 views
4 answers
asked
Aug 25, 2019
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
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2.8k views
1 answer
asked
Apr 29, 2018
by
anonymous
Last Answer : Impedance relays are used for phase faults on long line.
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83 views
1 answer
asked
Mar 20, 2018
by
anonymous
The standard for long distance analog signal transmission in process control industry is (A) 4-20 mV (B) 0-20 mA (C) 4-20 mA (D) 0-5 V
Last Answer : The standard for long distance analog signal transmission in process control industry is 4-20 mA
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2.6k views
1 answer
asked
Apr 26, 2018
by
anonymous
what is mean by medium transmission line ?
Last Answer : The transmission line which have length between 80 km to 250 km is known as medium transmission line.
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109 views
1 answer
asked
Aug 18, 2017
by
anonymous
what is mean by short transmission line ?
Last Answer : The transmission lines which have length less than 80 km is known as short transmission lines.
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104 views
1 answer
asked
Aug 18, 2017
by
anonymous
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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.
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136 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
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178 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
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102 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.
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76 views
1 answer
asked
Aug 25, 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.
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187 views
3 answers
asked
Aug 18, 2019
by
anonymous
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
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294 views
1 answer
asked
Jun 18, 2018
by
anonymous
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.
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154 views
1 answer
asked
May 8, 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
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314 views
1 answer
asked
Apr 30, 2018
by
anonymous
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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
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164 views
1 answer
asked
Apr 29, 2018
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.
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330 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
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71 views
1 answer
asked
May 22, 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
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189 views
1 answer
asked
May 6, 2020
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
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363 views
1 answer
asked
May 8, 2018
by
anonymous
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
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347 views
1 answer
asked
May 8, 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
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454 views
1 answer
asked
May 3, 2018
by
anonymous
Series capacitive compensation in EHV transmission line is used to
Last Answer : To maintain voltage stability
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468 views
2 answers
asked
Apr 29, 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, 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
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3.0k views
2 answers
asked
Apr 28, 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
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89 views
1 answer
asked
Apr 26, 2018
by
anonymous
Last Answer : Reactance relay is preferred for phase fault on short transmission line.
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110 views
1 answer
asked
Mar 20, 2018
by
anonymous
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Last Answer : When a wave propagates on a transmission line, it suffers reflection several times at sending and other end.
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131 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : The interaction between a transmission line and communication line is minimized by transposing transmission as well as communication lines, increasing the height of the transmission line tower, increasing the distance between the two lines.
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168 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : When a transmission line is energized, the wave that propagates on it is current wave and voltage wave.
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126 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : A transmission line is protected by distance protection, time graded and current graded overcurrent protection.
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82 views
1 answer
asked
Mar 19, 2018
by
anonymous
What are the losses in a transmission line?
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61 views
0 answers
asked
Mar 10, 2018
by
anonymous
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96 views
0 answers
asked
Jan 21, 2020
by
Shubham
Draw a neat sketch and explain the accessory used to support long work.
Last Answer : Accessory to support long work: A steady rest is a tool for a lathe, enabling a machinist to make deep cuts in long, slender stock, bore out thin pieces of metal, and generally keeps thin stuff straight. ... tool that follows the cutter, a steady rest is firmly attached to the bed of a lathe.
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112 views
1 answer
asked
Jan 2, 2021
by
anonymous
Last Answer : Power for lighting in passanger coach, in a long distance electric train, is provided through individual generator of bogie and batteries.
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103 views
1 answer
asked
Mar 22, 2018
by
anonymous
Last Answer : A cumulatively compounded long shunt generator when operating as a motor would be differentially compounded long shunt.
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111 views
1 answer
asked
Mar 21, 2018
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
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113 views
1 answer
asked
Aug 25, 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.
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5.2k views
1 answer
asked
Jun 29, 2019
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%.
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102 views
1 answer
asked
Sep 5, 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.
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1.1k views
2 answers
asked
Mar 25, 2018
by
anonymous
Which of the following is the demerit of a 'constant voltage transmission system' ? (a) Increase of short-circuit current of the system (b) Availability of steady voltage at all loads at ... of carrying increased power for a given conductor size in case of long-distance heavy power transmission
Last Answer : (a) Increase of short-circuit current of the system
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20 views
1 answer
What are the factors that limit the maximum power transfer capability in a transmission line?
Last Answer : Answer: Some of the factors which limits the maximum power transfer are: 1. Electrical phase shift 2. Voltage drop 3. Thermal effects in the line
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39 views
1 answer
Which of the following characteristics should the line supports for transmission lines possess ? (a) Low cost (b) High mechanical strength (c) Longer life (d) All of the above
Last Answer : (d) All of the above
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11 views
1 answer
Transmission line insulators are made of (a) glass (b) porcelain (c) iron (d) P.V.C.
Last Answer : B
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17 views
1 answer
How many insulator disc used for 33 kV transmission voltage line?
Last Answer : 5,As 33kv is Vrms
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158 views
1 answer
asked
Dec 5, 2017
by
anonymous
What is the advantage of AC over DC electrical transmission?
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82 views
0 answers
asked
Apr 26, 2020
by
anonymous
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necessity of transmission of electricity.
Last Answer : Because of following points there is necessity of transmission of power: 1. Electrical load on power system is not concentrated at one place but it is widely spread. 2. Load ... to the point of actual utilization of it (consumers) for this purpose transmission electricity is necessary.
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63 views
1 answer
asked
Aug 25, 2019
by
anonymous
Obtain the relationship between the reflection and the transmission coefficients in terms of the intrinsic impedance of the respective mediums when a plane wave propagating normal to the reflection surface between medium 1 and medium 2 reflects on the inter surface
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63 views
0 answers
asked
Aug 24, 2019
by
anonymous
Why are overhead transmission lines not insulated?
Last Answer : Insulators are useful to help separate electrical conductors when they come into physical contact. Overhead Transmission Lines Are Not Insulated: The overhead transmission line is carrying extreme high voltage and ... a whole lot of thick insulation to absorb the heat produced by such high voltage.
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154 views
7 answers
asked
Aug 18, 2019
by
anonymous
i) State the significance of modulation index in AM transmission. ii) Explain the effect of modulation index on AM wave with waveforms.
Last Answer : Significance of modulation index in AM transmission It is used to determine the strength and quality of transmitted signal. If the modulation index is small, then the amount of variation in ... amplitude part of its information is lost in the process of modulation which is undesirable.
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355 views
1 answer
asked
Aug 4, 2019
by
anonymous
Compare characteristics of asynchronous and synchronous transmission mode (four points).
Last Answer : Synchronous transmission Asynchronous transmission 1. Synchronous transmission are synchronized by an external clock. 1. Asynchronous transmission are synchronized by special signals along the transmission ... for transferring a small amount of data as it is simple and economical.
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82 views
1 answer
asked
Aug 4, 2019
by
anonymous
The permissible voltage variation in transmission and distribution system is: (A) ± 0.1% (B) ± 1% (C) ±10% (D) ± 25%
Last Answer : The permissible voltage variation in transmission and distribution system is: ±10%
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487 views
1 answer
asked
May 8, 2018
by
anonymous
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