In ships,AC System is preferred over DC System because of the following reasons : Smaller, lighter compact and compact machine size , for a kilowatts. High power and high voltage AC generator can be easily manufactured. Voltage can be raised or lowered by Transformer.
What are the advantages and disadvantage of AC over DC? (i) The generation of AC is cheaper than that of DC. (ii) When AC is supplied at higher voltages, the transmission losses are small compared to DC transmission. (iii) AC can easily be converted into DC with the help of rectifiers.
What is AC and DC distribution system?
3 phase A.C distribution system requires 4 wires. D.C distribution system requires only one wire with the ground as a return path. The voltage at the far end is a less i.e. voltage drop in the distributor is more to the presence of inductance. Therefore the cost of erection is less than the A.C system.
What is the difference between AC and DC distribution system?
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. The voltage in AC circuits also periodically reverses because the current changes direction.
What are the advantages of AC and DC?
Following are the advantages of alternating current over direct current: AC is less expensive and easy to generate than DC. The distance covered by AC is more than that of the DC. The power loss during transmission in AC is less when compared to DC.
Why is AC used on ships?
However, it was difficult to transfer electric power over long distances. Thus the AC system, which can transfer high voltages easily using transformers, was selected as a standard power system. In the marine industry as well, most ships have used the AC system for a long time, except for small boats.
Why AC current is used in ships?
AC, 3 phase power is preferred over DC as it gives more power for the same size. 3 phases is preferred over single phase as it draws more power and in the event of failure of one phase, other 2 can still work.
What is the disadvantages of AC over 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 is AC distribution system?
AC Distribution System: A system where electrical energy is distributed among the consumers from generating stations or substations in the form of AC is an AC distribution system.
Why is AC distribution preferred than DC distribution?
The reasons for preferring the AC system over DC are as follows: It is easy to maintain and changes the voltage of AC power for transmission and distribution. AC voltages can be easily transformed to higher or lower voltage levels, while it is difficult to do in the case of DC voltages.
What are the advantages and disadvantage of AC and DC?
(i) The generation of AC is cheaper than that of DC. (ii) When AC is supplied at higher voltages, the transmission losses are small compared to DC transmission. (iii) AC can easily be converted into DC with the help of rectifiers.
What is the advantage and disadvantage of AC and DC current?
A DC transmission line has better voltage regulation than an AC transmission line. For the same voltage, A DC transmission system requires less insulation material because the potential stress on the insulation is less in case of DC transmission system than that in AC transmission system.
Do ships use DC or AC?
ABSTRACT. The primary electric power system of ships has been based on the alternating current (AC) system for a long time.
Why there is no neutral in ships?
But at sea, a power outage can cause the ship to be at risk while coming through a channel, narrows or docking. So to protect the integrity of the power system, an insulated neutral is used. A single ground fault will not activate circuit protection. If a single ground fault occurs, the hull is energized.
Which current is used in ships?
The majority of ships have a 3-phase d. c., 3-wire, 440 V insulated-neutral system.
Why is AC distribution is preferred over DC distribution onboard the ship?
In ships,AC System is preferred over DC System because of the following reasons : Smaller, lighter compact and compact machine size , for a kilowatts. High power and high voltage AC generator can be easily manufactured. Voltage can be raised or lowered by Transformer.
What are the advantages of AC over DC Class 10?
AC is less expensive and easy to generate than DC. The distance covered by AC is more than that of the DC. The power loss during transmission in AC is less when compared to DC.
What are disadvantages of AC current?
The disadvantage of Alternating Current
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.
Which is an advantage of AC over DC power?
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 is the main difference between AC and DC?
In direct current, the voltage is always constant, and the electricity flows in a certain direction. In contrast, in alternating current, the voltage periodically changes from positive to negative and from negative to positive, and the direction of the current also periodically changes accordingly.
What is the difference between AC or DC?
Electric current flows in two ways as an alternating current (AC) or direct current (DC). In alternating current, the current keeps switching directions periodically – forward and backward. While in the direct current it flows in a single direction steadily.
What is advantage and disadvantage of AC?
They are functionally different from fans, because fans don't actually cool air, but only make it feel cooler by moving it around. The advantage of air conditioners is that they increase comfort levels during hot weather, but they can also present various disadvantages.
Is AC harmful for health?
Being in AC for too long can result in drying out of your nasal passages. Irritation in mucous membranes and drying out of mucous can also happen. Absence of protective mucous can make you more prone to viral infections. Being dehydrated because of AC can cause headaches and migraines.
Is sleeping in AC good for health?
Benefits of sleeping with AC
Sleeping with the AC on helps prevent heat-related conditions, such as dehydration, heatstroke, and heat exhaustion. Typical AC filters will not purify the air, though they can prevent dust and particles from entering the unit.
What is the side effect of AC?
If you work in an air-conditioned building with poor ventilation, it can raise your risk of “sick building syndrome.” Symptoms include headaches, dry cough, dizziness and nausea, trouble concentrating, fatigue, and sensitivity to odors. Forced indoor air may also slightly raise your risk of COVID-19.