Electrical Engineering

A single speed permanent split capacitor AC induction motor has two separate pairs of series wound stator windings arranged at right angles to each other around the central rotor. The main run winding is connected directly to the AC power source while the secondary start winding is connected to the same source with a capacitor in series with it. The capacitor causes an electrical phase shift to the power in the start winding relative to the run winding, to produce a rotating magnetic field around the rotor which can start it turning. Since the capacitor remains in the circuit while the motor is running it's called a permanent split capacitor design.

Rectifier efficiency is the ratio of the DC output power to the AC input power.

efficiency (η)= P

dc

-----------

P

ac

for a full wave rectifier, η= 81.2%

~Amog

Yes, you would use step down transformer.

ANSWER:Imagine that all the elements of a simple circuit (such as a battery, a light globe , a switch, and a resistor ) When the switch is closed , the electric current flows round and round the circuit just the same way as water would flow through these elements if the circuit had a Water pressure supply and a thin section of pipe and then a thick section of pipe etc . The FLOW of the electricity in Amps can be thought of as the same thing as the Flow rate of water in a pipe system. The Ammeter, is put into the circuit between any 2elements of the circuit, so that the current flows through it , as well as all the other elements (parts) of the circuit. When current flows through the various elements the flow rate (Current) is the same in all of them. As the current flows through, there is a drop of pressure (Voltage) as the electrons flow through each of the elements of the circuit. The actual pressure(volts) in each piece of the circuit , can be measured, by placing a Voltmeter across any individual item in the circuit. The drop in pressure at each item is measured by connecting each terminal of a Voltmeter across the item you are dealing with. The voltage across the 2terminals of the supply will be perhaps 12 Volt(a car battery) The volts ' pressure ' across the globe may be say 8 volt and the volts across the switch may be 3volts and the volts across the resistor may be only 1 volt. Always think of Ampere, as 'Flow Rate', and think of Voltage as ' Electric Pressure' If a circuit has a spot where it splits into 2 separate circuits , and then turns back into 1 piece of circuit, the current flowing as it goes into the 2 different passages, is split up, or shared between the 2 passages, and then the 2 separate currents join together again as they re-enter the single part of the circuit. To find out the current flow in each of the 2 parallel parts of the circuit you must place the Ammeter in series within each of the 2peices of circuit . The 2 separate curent readings will have a total equal to the current reading in the main single passage circuit.

ht cable that means voltage level is high , it is obvious that power is going to remain same ,so if voltage rises ,current has to be lowered .since current level is less in ht cable therefore size (dia) is less compared to l.t cable , (p=v.i),lt cable current rating is more and voltage rating is less

a constant amplitude supply

Air vane motor advantages:

- low weight and small size (only 1/5 of the weight and 1/2 of the size of an electric motor of equivalent power)

- safe or use in potentially explosive requirements (air motors fulfill ATEX requirements)

- overload safe - an airmotor can be load to standstill without damage

- sterilisable for repeated use in clean-rooms

- sealed - even for underwater usage

- insensitive to cleaning agents

- suitable for the high standards of the food processing and pharmaceutical industry

- insensitive to acids

- torque increase with higher load

- insensitive to vibrations

- insensitive to heat

- insensitive to dust

- reversible - can be set in both rotational directions

- speed is easy to controll: adjustment of the speed by altering the pressure or air quantity (throttling via valve)

- low installation costs

- maintenance friendly

What is an air vane motor?

Alle vane motors essentially consist of a rotor, which circulates in an exxentrically offset perforation of a rotor cyclinder. Because of this eccentrically offset perforation, the vanes form working-chambers. The expanding of the compressed supply air (the pressure energy) is converted into kinetic energy - this results in a rotation of the rotor.

A typically vanes motor speeds up to approx. 60,000 rpm. In combination with a gear box the speed can be regulated down to 5 rpm.

Air vane motors are safe and robust drive systems, which come into play when a high performance and overload safe drive is required. Always ready for action long after traditional drive technology has stopped spinning!

It is an circuit that is used to find the value of the resistances. The main principle behind it is the balancing an circuit by means of varying an resistance on connected to an arm of the circuit.When the resistance become equal to the variable resistance no current flows thus we can find the value of the resistance.

Wires

The forward resistance of a diode is, by Ohm's law, the voltage across the diode divided by the current through the diode. Note that, since diodes are non linear, the effective resistance is not constant over all possible voltages and currents.

A solution of ions of the metal to be plated in an ionizing solvent. Electroplating occurs on the cathode imposed by an external electromotive force.

There is no such equation, since the output of a step-down transformer is not DC. The AC output is simply the input voltage divided by the turns ratio. So, if the input voltage is 120V, and the turns ratio is 5:1, then the output would be 24VAC. Now, if the transforner is followed by a rectifier, producing a DC output, then the output voltage depends on the type. For a half-wave rectifier, the DC output is 0.707 time the AC output. For a full-wave rectifier, the DC output will be 1.414 times the AC output. So, if we take our 24VAC transformer output, and feed it through a full-wave rectifier, the DC output would be 33.9VDC. If the rectifier output is smoothed by a filter capacitor, then the above is only true if the power supply is loaded. The half-wave rectifier output will drift up to the peak voltage (1.414 * AC) if it has no load.

Current increases with an increase in potential difference due to Ohm's Law, which states that current (I) is directly proportional to voltage (V) and inversely proportional to resistance (R): (I = \frac{V}{R}). As the potential difference across a conductor rises, more voltage pushes charge carriers through the circuit, resulting in a higher current, assuming resistance remains constant. This relationship is fundamental in understanding how electrical circuits operate.

It is not true that another name for the "Y" or "wye-connected" system of polyphase power is the "delta" system.

It's called the "star" system.

it is made out of melamine because its hardcore like ethan slab ed joseph

Yes it's valid. You can check the list of approved universities in UGC's website or NAAC website. The full name of RVD university is 'Janardan Rai Nagar Rajasthan Vidyapeeth (Deemed) University', so you should be looking for this name. Also it has a B++ rating You can check the below link also. http://www.educationobserver.com/resources/universsities/rajasthan.htm Regards Sunil

a generator is built in three phases

The current through the circuit is directly proportional to the voltage across the circuit.

The proportionality constant is 1/R, where 'R' is the total effective resistance of the circuit.

C = V / R

V = C R

R = V / C

To prevent the equipments from lightning strokes. Because the cloud is negatively charged at bottom it requires a zero or a positive potential to discharge, and it selects the ground (Zero potential) to discharge. If the Telecom Equipments are fed with positive the cloud will choose the low resistance tallest positively charged Antenna's to discharge, this could damage the entire setup of Telecom equipments. So the Telecom equipments are fed with Negative supply Voltage.

If these are the exact voltages that you need you will need an auto transformer to obtain these voltages. If these voltages are nominal voltages and are of a three phase four wire configuration, the 220 voltage can be obtained from the three phase legs to the neutral (ground) connection. The equation to use is 400/1.73 = 231 volts.

Step up transformers are used to increase voltage.

Step down transformers are used to decrease voltage, these are the most common. The can on the power pole is a step down, a doorbell also uses a step down transformer.

Power transformers have both no load and full load losses. The key is copper wiring, as copper varies with the square inches of the secondary and primary currents.