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 are the advantages of DC?
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 are the disadvantages of AC and DC?
The peak value of A.C. is high and it is dangerous to use so better insulation is required. It attracts a person who touches it, unlike D.C. which gives a repelling shock. An A.C. is transmitted from the surface of the conductor and hence need several strands of thin wires insulated from each other.
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 are the disadvantages of DC?
Disadvantages of DC Transmission:
- Due to commutation problem, electric power can’t be produced at High (DC) Voltage.
- In High Voltage transmission, we cant step-up the level of DC Voltage (As Transformer won’t work on DC).
- There is a limitation of DC switches and circuit breakers (and they are costly too).
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 is disadvantage of DC drive?
The disadvantage of D.C. drives is the presence of a mechanical commutator which limits the maximum power rating and the speed.
What is the disadvantage of DC motor?
DC Motor Advantages & Disadvantages
| Advantages | Disadvantages |
|---|---|
| Inexpensive controls for speed regulation | Cogging at speeds of less than 300 rpm |
| Generally a low-cost motor option | Significant power loss on full wave rectified voltage |
| Easily pairs with gear reducers | High starting torque can damage reducers |
What’s the advantage of AC over DC?
Key Advantages of AC over DC
The AC is simpler to produce than DC. It is also less expensive than DC to generate. The AC systems have higher efficiency than DC such as ac generators. The waste of power is negligible for AC during transmission.
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 are the advantages of high voltage for transmission both AC and DC?
High-voltage direct current (HVDC) technology offers several advantages compared to alternating current transmission systems. For example, it allows more efficient bulk power transfer over long distances. However, cost is an important variable in the equation.
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.
What are the main disadvantage of direct current?
If we transmit the electricity in the format of direct current within the wires, the main portion of the electricity is already reduced and wasted in the shape of heat that will cause nothing but loss. This is the basic disadvantage of the direct current.
Is AC or DC better?
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 are the advantages and disadvantages of a DC shunt motor?
The installation of DC machines is expensive compare with other types of machines. Shunt motor is a constant speed motor, it would be disadvantages where it’s necessary to operate under variable speed. For the same current input, its starting torque is not a high as that of a DC series motor.
What are the advantages of DC motor?
Advantages of DC Motors
- Good speed control. DC motors offer highly controllable speed.
- High torque.
- Seamless operation.
- Free from harmonics.
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.
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.
What are the disadvantages of AC current?
The disadvantage of Alternating Current
- It is less dangerous than DC but more attractive.
- Working with AC is much more dangerous than high voltage DC.
- AC can not be used for electrofishing, electroplating, etc.
- Cannot charge batteries directly from AC.
- Fatal accidents can happen with the slightest disregard.
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.
Why is DC transmission more efficient?
Alternating current travels as a wave, and is constantly changing direction (60 times per second, defined as 60 hertz, in North America). Since direct current does not involve oscillation, it decreases losses and allows electricity to be transmitted more efficiently.
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