Bissoy.com
Doctors Medicines MCQs Q&A

Which of the following statement is TRUE in case of a HVDC system?

Which of the following statement is TRUE in case of a HVDC system? Correct Answer neither charging current nor skin effect

Both skin effect and charging current are absent in the HVDC system.

Due to DC supply, the current distribution is the same on the wire so there is no skin effect and shunt capacitance offers infinite impedance to DC voltage so no charging current.

Advantages of HVDC transmission:

  • No Skin Effect: In HVDC transmission current distributes uniformly over the cross-section of the conductor. Hence no loss due to skin effect is encountered. For the same current-carrying capacity HVDC lines have lesser cross-section compared to HVAC lines
  • Lower Transmission Losses: HVDC transmission requires only two conductors. Therefore the power loss in the DC line will be lesser compared to the AC line
  • Good voltage Regulation: In DC lines, a voltage drop does not exist due to inductive reactance. Voltage Regulation will be better in HVDC transmission
  • Surge Impedance Loading: Long EHV lines are loaded to less than 80% of the natural load. No such condition is applicable in HVDC transmission
  • No Line Loading Limit: The permissible loading limit on EHV AC lines is limited by the transient stability limit and the line reactance to almost one-third of the thermal rating of the conductors. No such limitations exist in the case of HVDC line
  • Lesser Corona Loss and Radio Interference: Corona Loss directly proportional to frequency. Therefore in the DC line, corona loss will be lesser compared to the AC line.
  • Higher Operating Voltages: The design of Insulation of the conductors for high voltage transmission lines depends on the switching surges but not on lightning surges (for voltages beyond 400kV switching surges are more severe than lightning surges). The level of switching surge will be lesser in the DC line compared to the AC line. Hence less insulation is required in DC line
  • Reactive Power Compensation: Unlike the AC line DC line does not require any reactive power compensation devices. This is because of the absence of charging currents and power factor operation.
  • Short circuit currents during a fault in DC line will be lesser compared to AC lines.
  • Absence of the charging currents and limitations on the cable lengths.
  • Economical and greater reliability.

Related Questions

What is the printout of the following switch statement? char ch = 'a'; switch (ch){ case 'a': case 'A': System.out.print(ch); break; case 'b': case 'B': System.out.print(ch); break; case 'c': case 'C': System.out.print(ch); break; case 'd': case 'D': System.out.print(ch); }
What is the printout of the following switch statement?
char ch = 'a'; switch (ch){ case 'a': case 'A': System.out.print(ch); break; case 'b': case 'B': System.out.print(ch); break; case 'c': case 'C': System.out.print(ch); break; case 'd': case 'D': System.out.print(ch);}
In this question a passage and a statement related to it have been given. Read carefully the passage and review the statement based on it. When Shah Jahan gave his love for Mumtaz, he would have believed that the river would continue to flow. There was no solid land on which the foundation could be laid. Therefore, to reduce the level of water, he used an engineering system to use the foundation of deep well and it was filled with stone and mud. Finally, he covered them with wooden box work structure and the tomb Made Yamuna is an integral part of the creation of the Taj and there was no such predict ion that it would dry up or become narrow. But the river was narrow and it became contaminated. The timber of wood is likely to be brittle or disintegrated as the venetian made on the foundation of wood, indicates that when the wood is submerged in the wood, the age of the wood increases. When the wood does not come in contact with oxygen, then that But such creatures cannot be found who destroy them. Due to the dryness and contamination of the Yamuna, the breakdown of a wooden tree can break. Statement. To maintain the structure of the TajMahal, a revival of Yamuna river is necessary. Choose one of the following options. A. The statement is definitely true. B. The statement is probably true. C. Statement cannot be determined D. Statement is definitely wrong.
In this question a passage and a statement related to it have been given. Read carefully the passage and review the statement based on it. When ShahJahan gave his love for Mumtaz, he would have believed that the river would continue to flow. There was no solid land on which the foundation could be laid. Therefore, to reduce the level of water, he used an engineering system to use the foundation of deep well and it was filled with stone and mud. Finally, he covered them with wooden box work structure and the tomb Made Yamuna is an integral part of the creation of the Taj and there was no such predict ion that it would dry up or become narrow. But the river was narrow and it became contaminated. The timber of wood is likely to be brittle or disintegrated as the venetian made on the foundation of wood, indicates that when the wood is submerged in the wood, the age of the wood increases. When the wood does not come in contact with oxygen, then that But such creatures cannot be found who destroy them. Due to the dryness and contamination of the Yamuna, the breakdown of a wooden tree can break. Statement: Tajmahal is built on a strong solid land along Yamuna river. Choose one of the following options. A. The statement is definitely true. B. The statement is probably true. C. Statement cannot be determined D. Statement is definitely wrong.
From an alloy, two specimens are machined and tested separately under tension and compression. The engineering stress-strain curves as well as the true stress-true strain curves for tension and compression are plotted in the same diagram. Identify the correct statements:
P. The engineering stress-strain curves in tension and compression are identical.
Q. The true stress-true strain curve in compression is lower than the true stresstrue strain curve in tension due to Bauschinger effect.
R. The true stress-true strain curve in tension is above the corresponding engineering stress-strain, curve.
S. The true stress-true strain curve in tension and compression are identical.
In this question, a statement is given and there are two conclusions similar to that of i and ii. It is to be assumed that you have all the truth in the statement given, and then both the conclusions are to be taken concurrently and to determine which conclusions are reasonable without any reasonable conclusions from the information given in the statement.   Statement: Every Saturday is a holiday. Today is the holiday. Conclusion: i) Today is Saturday. ii) Today is not Saturday. Choose the correct one from the next options A) Only conclusions ii is true. B) Only conclusions i is true. C) Either i or ii is true. D) None of the i or ii is true. E) i and ii are both true.
In this question, a passage and a statement related to it have been given. Read carefully the verse and review the statement based on it. Delhi, which is one of India's capital an d one of the largest cities in the world, is undergoing severe crisis, due to its high level of urbanization, increasing population and high levels of pollution. Studies have proven that Are the biggest factors of pollution used for industrial and domestic use? And due to their use, people here emit large quantities of nitrogen oxides (NOx), ozone (O3), black carbon (BC) and microorganisms (PM). According to the 2015 Global Burden of Disease report, there were 1.09 million deaths due to PM 2.5 in India. Air pollution was included as one of the 10 biggest threats to health. According to the World Health Organization, 37 cities of India are among 100 worst polluted cities in the world, where PM10 was found to be the highest ever. For the production of ozone, together with sunlight and heat, nitrogen oxides (NOx) and organic compounds (VOCs) are needed simultaneously. Therefore, in the summer months, ozone is produced in large quantities in the cities. Statement: Air pollution is one of the top 10 factors affecting health in India. Select the most suitable from the following options A-statement is absolutely true B-statement is probably true C-statement can not be reviewed D-statement is completely false
In this question, a passage and a statement related to it have been given. Read carefully the verse and review the statement based on it. Delhi, which is one of India's capital an d one of the largest cities in the world, is undergoing severe crisis, due to its high level of urbanization, increasing population and high levels of pollution. Studies have proven that are the biggest factors of pollution used for industrial and domestic use? And due to their use, people here emit large quantities of nitrogen oxides (NOx), ozone (O3), black carbon (BC) and microorganisms (PM). According to the 2015 Global Burden of Disease report, there were 1.09 million deaths due to PM 2.5 in India. Air pollution was included as one of the 10 biggest threats to health. According to the World Health Organization, 37 cities of India are among 100 worst polluted cities in the world, where PM10 was found to be the highest ever. For the production of onoos, together with sunlight and heat, nitrogen oxides (NOx) and organic compounds (VOCs) are needed simultaneously. Therefore, in the summer months, ozone is produced in large quantities in the cities. Statement: Ozone does not arise more than a boundary on the ground in the summer months in cities. Select the most suitable from the following options A-statement is absolutely true B-statement is probably true C-statement can not be reviewed D-statement is completely false
There is a hint in this question and a statement is given later. Carefully read the excerpts provided and determine the statement based on that episode. The current Australian team has lost three of their last five Test series. They lost their last two Test series, one of which was against Pakistan, which is not considered to be a strong team now. Australia's two best batsman, Steve Smith and David Warner are currently suspended and their absence has weakened the Australian team. There is a lot of dissatisfaction and introspection about how their national team plays in Australia, how they show aggression on the field, how they do not show respect to the team against them, and neglecting the media at the most, and focusing only on winning only, the discussion on the future of the game is ongoing. There are. Australian cricket never reached such a low level. This is the best opportunity to knock them into their own house. In other words, if this India could not beat Australia in Australia in this series, then it would prove that the campaign around this team is only the same: the propaganda. Statement: India has a good chance of defeating Australia. Choose the right one from the next option A - The statement is completely true. B - statement is most true. There is no definitive definition based on C-statement. D-statement is completely false.
In this question, a passage and a related statement have been given. Read the passage carefully and assess the statement based on it. Using knives and screws, two Russian astronauts on Tuesday took a sample of substance around a mysterious cavity of the spacecraft called the Soyuz, which was placed in the International Space Station, a Moscow official suggested that it was a break - It can also be done. In August, two months after the last visit of the vehicle, the air leak was detected in the Soyuz spacecraft due to the 2 mm air in the ISS. Roskosmos, an astronomical institute, says that cutting off the insulation on the hole and sampling the material around it and the purpose of putting a new insulation on it is to find out that this small but dangerous hole has been done on earth or Is in space. The chief of Roskosmos has said that the error of manufacturing has not been found in the investigation. Experienced astronauts had to struggle but they managed their mission. Before the spacewalk, astronauts were able to inspect the hole just from within the spacecraft. The biggest difficulty was that in the Soyuz spacecraft, the ISS was not designed to improve during adverse weather space, and no railing was also made to catch the space passengers outside the vehicle. Statement: The mysterious hole in the So yuz spacecraft was due to the error of manufacturing. Select the appropriate from the given options A - Statement is completely true B - The statement is possibly true C - the statement can not be determined D - Statement is completely false