Electrical Engineering

its impossible to give suppy to rotor of an induction motor,because of it a closed path for circulating currents.

A transformer is the answer to this question.

due to change in flux

Quasi Square Wave or Modified Square Wave actually mean the same thing. Modified square wave is the actual wave form. Quasi Square Wave is a marketing term used by many low cost inverter manufactures.

Inverters convert Direct Current DC to Alternating Current AC. Old obsolete inverter technology created square wave output. As stated by the name the wave form is square not sinus as required to have pure sine wave AC. Modified square wave has a step or dead space between the square waves. This reduces the distortion or harmonics that causes problems with electrical devices. Modified Square Wave inverters will work fine for pure resistive loads, like lamps or heaters. It will also work well with pure inductive loads, like universal motors in mixers and blenders. If these devices have electronic speed control this could be damaged. Devices that have transformers in their power supplies, Microwave Ovens, TVs, Computers etc. will run hotter and less efficient. These devices will not last as long as the would on pure sine wave inverters. For the money the modified square wave inverter will cost more in the long run by reduced efficiency and possible damage to appliances. I highly recommend that you use a pure wave inverter it will cost less by increased efficiency, problems and possible damage to your appliances.

A potential transformer steps the high voltage down to a level of 120 V to measure them safely and easily.

Taking some bulbs out of the circuit!! (I think :P) Taking some bulbs out of the circuit!! (I think :P) Use Ohm's law I = E/R. Add some values and check it out.

You use the formula V = IR (where V and E are the same thing, voltage. I is the current. R is the resistance). If you add more resistance then your current will be lower. I would suggest looking at parallel and series resistance so that you can understand equivalent resistance.

if it's volt per ohm a ma would be 0.000001 of volt per ma

that is incorrect .000001 is a micro-amp not ma. besides you need two units to solve it Basically it is a ratio 1:1:1 1Ohm 1Volta 1Ampere NAMED AFTER THE DISCOVERY GUYS

A microphone does not generate waves but Rather generates a stream of electrons. Waves needs a medium to propagate like air & water. A broadcasting station does send waves as electrons signals but the medium is not physical

People, animals, furniture, etc. anything you can move

It is the process of conversion of generated ac voltage into the armature of a dc generator to dc voltage at the terminal of the dc generator by use of pair of brushes and commutator.

OR It is the process of conversion of given dc voltage at the terminal of the dc motor to ac voltage in the armature windings in a dc motor by use of pair of brushes and commutator.

chopper

Yes.

5 ohms or less.

Assuming 208V 1 phase, 125% of the FLA, 40X 1.25 = 50, A 50 amp 2 pole breaker would be used and would be the maximum allowed by the NEC

north and south magnets, a coil, commutators, output, and a handle LOL

Harmonic structure, also known as timbre.

when its is short circuited there will not be any drop and hence the current will b maximum when its is short circuited there will not be any drop and hence the current will b maximum

Nothing will happen, you can go over 6.3v but never under......

All machines are constructed from six simple machines

0.8-1.2V Depends on manufacturer and technology options.

89s51 and 89s52 both are same version of 8051 microcontroller

If the stator winding of a synchronized machine, which consists of many coils that are basically connected as a series

circuit, is not connected to a load then the resulting emf from all the coils is the open circuit emf of

the phase winding. Closing the circuit on to a load causes a steady state current to flow in the stator

coils. Each coil creates a flux and their total flux opposes the field flux from the rotor. The resulting

flux in the air gap is reduced. The emf corresponding to the air-gap flux drives the stator current

through the leakage reactance and conductor resistance of the stator coils. The voltage dropped across

this winding impedance is small in relation to the air-gap voltage. Deducting this voltage drop from

the air-gap voltage gives the terminal voltage of the loaded generator. In the circumstance described

thus far the reduction in air-gap flux is called armature reaction and the resulting flux is much smaller

than its value when the stator is open circuit. Restoring air gap and terminal voltage requires the

field current to be increased, which is the necessary function of the automatic voltage regulator and

the exciter.

When the rotor pole axis coincides with the axis of the stator coils the magnetic circuit

seen by the stator has minimum reluctance. The reactance corresponding to the armature reaction

in this rotor position is called the 'direct axis synchronous reactance Xsd '. If the stator winding

leakage reactance, Xa, is deducted from Xsd the resulting reactance is called the 'direct axis

reactance Xd '.

A similar situation occurs when the rotor pole axis is at right angles to the axis of the stator

coils. Here the magnetic reluctance is at its maximum value due to the widest part of the air gap facing

the stator coils. The complete reactance in this position is called the 'quadrature axis synchronous

reactance Xsq '. Deducting Xa results in the 'quadrature axis reactance Xq '.

No. You have to consider the inductor and the capacitor.

Impedance of RLC circuit is equal to to the Value of Resistor Only AND Only on Resonate frequency.

otherwise u have to cnsider resistance inductance and capacitance together in series.

The windings behave in the same fashion as the squirrel cage of an induction machine. When rotor speed differs from the stator-side electrical speed, currents are induced in the damper windings. These currents set up a torque that has the effect of pulling the rotor back toward synchronous speed. This is true whether the rotor is spinning above synchronous or below synchronous speed.

When the rotor is spinning at synchronous speed (i.e. zero slip), no currents are induced in the damper windings.

Damper windings are commonly found on large, low-speed, salient pole machines, where there is a tendency to have inadequately damped rotor oscillations without the amortisseurs.