DC power is significantly more energy efficient than AC power. DC motors and appliances have higher efficiency and power to size characteristics. DC-based lighting (LED) is as much as 75% more efficient than incandescent lighting.
What is the advantage of DC power transmission?
A DC System has a less potential stress over AC system for same Voltage level. Therefore, a DC line requires less insulation. In DC System, there is no interference with other communication lines and systems. In DC Line, Corona losses are very low as compared to the AC transmission lines.
What are the advantages and disadvantages of DC power?
DC generators are more complex than AC generators. In fact, DC cannot be generated at a very voltage due to the commutation problem. 2. Although DC transmission and distribution more simpler and low expensive than the AC but DC cannot be transmitted over a long distance because it cannot be step up or step down.
What is the advantage of DC and AC?
A video comparing Alternating Current and Direct Current
| Alternating Current | Direct Current |
|---|---|
| AC is safe to transfer longer distance even between two cities, and maintain the electric power. | DC cannot travel for a very long distance. It loses electric power. |
What are advantages and disadvantages of AC and DC transmission?
In AC transmission system, the power can be transmitted for long distance and in DC transmisson system, the losses are low. In AC transmission system, the power can be transmitted for long distance and in DC transmisson system, the losses are low.
What is the main advantage of AC distribution system compared to DC distribution system?
Other advantage of ac system is that electrical power can be generated at high voltages easily and maintenance of ac substation is cheaper and easier. Distribution of ac system is undoubtedly superior to that of a dc system as in the ac system voltage control is easy by means of transformers.
Which one is not advantage of DC?
Electric power cannot be generated at a high DC voltage due to commutation problems in the DC generator. The DC voltage cannot be stepped up for transmission of power at high voltages. There is some limitation in DC protective device i.e, DC Switch, DC Circuit Breaker.
What are the advantages of DC transmission over AC transmission Mcq?
What are the advantages of dc transmission system over ac transmission system ? (D) All of the above. (D) Less problem of instability.
105.
| Q 1- 15 | Q 16- 30 |
|---|---|
| Q 91- 105 | Q 106- 120 |
| Q 121- 135 | Q 136- 150 |
| Q 151- 172 |
What is difference between AC and DC?
Both AC and DC describe types of current flow in a circuit. In direct current (DC), the electric charge (current) only flows in one direction. Electric charge in alternating current (AC), on the other hand, changes direction periodically.
What is an advantage of AC over DC in transmission lines?
Alternating current is cheaper to generate and has fewer energy losses than direct current when transmitting electricity over long distances. Although for very long distances (more than 1000 km), direct current can often be better.
What is the difference between AC and DC distribution system?
Direct current (DC) is the flow of electric charge in only one direction. It is the steady state of a constant-voltage circuit. Most well-known applications, however, use a time-varying voltage source. Alternating current (AC) is the flow of electric charge that periodically reverses direction.
What is the advantage of using AC over DC How can this advantage be used practically explain it through an example?
1)We all know that we got ac supply in our homes and we got this supply by transmitting ac over long distances. AC can be transmitted using step up transformers but direct current or dc can not be transmitted by this method. 2)The ac is easy to generate than dc. 3)It is cheaper to generate ac than dc.
What is the importance of DC circuits?
A DC circuit is necessary for DC electricity to exist. DC circuits may be in series, parallel or a combination. Understanding DC circuits is important for learning about the more complex AC circuits, like those used in the home.
Where is DC used?
Uses. Direct current is used in any electronic device with a battery for a power source. It is also used to charge batteries, so rechargeable devices like laptops and cell phones come with an AC adapter that converts alternating current to direct current.
Why DC is not used in homes?
Direct current is not used at home because for the same value of the voltage, DC is more lethal than AC since direct current does not go through zero. Electrolytic corrosion is more an issue with direct current.
Is a battery AC or DC?
Batteries and electronic devices like TVs, computers and DVD players use DC electricity – once an AC current enters a device, it’s converted to DC. A typical battery supplies around 1.5 volts of DC.
Which is safer AC or DC?
Alternating current (A.C) is five times more dangerous than Direct current (D.C). The frequency of the alternating current is the main reason for this severe effect on the human body. The frequency of 60 cycles is in an extremely harmful range. At this frequency, even a small voltage of 25 volts can kill a person.
What is DC power supply?
A DC power supply, also known as a bench power supply, is a type of power supply that gives direct current (DC) voltage to power a device. A DC power supply management subsystem can use AC, DC, battery, or ultralow voltage as inputs.
Which transmission is better AC or DC?
DC is more efficient than AC of the same voltage, especially for long distances. Higher voltages are more efficient than lower voltages. It’s more costly to produce high voltage DC than AC, so it is only used for long distance lines.
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