Electrical Engineering

at lower power factor current drawn by load is high and at higher pf the current drawn is less...

125 percent of full current rating of the motor

The phrase "money is an effective winding sheet" suggests that wealth can serve as a covering or concealment for deeper issues, such as moral decay or social inequality. It implies that financial success may mask underlying problems, allowing individuals or societies to avoid confronting uncomfortable truths. Ultimately, it highlights the transient nature of money and the superficial comfort it can provide, potentially leading to a false sense of security.

When an electric wire is bent, it experiences mechanical stress that can lead to several outcomes. If the bend is gentle and within the wire's tolerance, it may not affect its functionality. However, a sharp bend can cause insulation to crack or break, potentially leading to short circuits or electrical faults. In extreme cases, repeated bending can weaken the wire, causing it to break or fail.

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In the late 1970's

Yes. DC biasing a transistor is necessary to force it to operate in its' linear region. What you have written is true.

Reference this site for an example of this:

http://www.tpub.com/content/neets/14179/css/14179_105.htm

rotor contactor are used to cut the resistance in slip-ring motor connected through resistance box. resistance is proportional to torque. so by controlling rotor contactor resistance can be controlled and hence torque can be controlled.

for more information check torque and speed characteristic of wound motor.

A: Substations step down the transmission voltage for distribution for the local area. The reason being that their input is in the range 0f 475 Kv trying to distribute that kind of hi voltage would be totally impractical because of insulation. So a substation step down the hi voltage to a distribution level of 16kv or so.

In most applications 200v is easier to get for a supply voltage than 380v.

14 mph

That depends on what happened the first time you connected the wire, and on how the wire was connected. There is insufficient information in the question to properly answer it. Please restate the question.

An air break switch comprising one or more fixed contacts and one or more movable contacts which are movable between open and closed positions, and a coil which, preferably in conjunction with magnetically susceptible material acting as a flux director, provides a magnetic field in the vicinity of the separable contacts in a direction which is substantially normal to a shock front which tends to be set up by establishment of an arc between the separable contacts and has a value such as to cause the Alfven speed, at least in the vicinity of plasma associated with the arc, to be significantly in excess of the air speed attainable by such shock front, in order to hinder or prevent establishment of such shock front. The coil may surround an arc chamber containing runners defining chutes into which the arc moves under the normal blow-out magnetic field set up by the current through the contacts and in the arc.

work

Not enough information. To answer this question the amount of current in AMPS the circuit is drawing is needed.

Yes.

Normally, in Transformers due to coil the temperature often rises up to a certain point.To minimise the temperature during transformer operation,specially engineered oil is used.To indicate the level of oil, a gauge is employed.

It is the one which is used to produce flux in transformer and main field flux in motor or generator. Flux is proportional to the current passed through the coil.

Flux is inversely proportional to the reluctance of the medium that the flux passes through. Flux is analogous to current. Reluctance is analogous to resistance. MMF is analogous to voltage.

so if there is a coil carrying 5A current and 10 turns it produces 5*10 = 50 Ampere Turns MMF .

so as the current increases MMF increases. If reluctance of the medium used is high there will be more flux.

Let us take a transformer in that in order to produce EMF in the secondary we have to give flux from the primary for that we need a current in the primary that is called Magnetizing current . Any way if we load the transformer , the transformer primary carries (N2 / N1 ) * I2 current in addition to magnetizing current. Apart from these two currents there will be another current which is responsible for core loss in the transformer. Please note that all these three currents are at different phase angles i.e. they are not in same phase.

Medium for the flux in the transformer is core. If it is a iron core reluctance is more , to produce same EMF it will take more magnetizing current. If we use CRGO steel as core reluctance is less. For less magnetizing current itself we get flux for the required EMF in secondary.

To convert a transformer connection from Zy5 (Zy5 is a delta connection on the high-voltage side and a star connection on the low-voltage side) to Dyn11 (which indicates a delta connection on the high-voltage side, a star connection on the low-voltage side, and a phase displacement of 30 degrees), you need to ensure that the phase shift is appropriately accounted for. This involves rearranging the connections of the transformer windings and possibly adjusting the phase sequence to achieve the required 30-degree phase displacement between the high-voltage and low-voltage sides. Proper testing and verification must be conducted to ensure that the new configuration operates correctly and safely.

The derivative of cos(x) is negative sin(x). Also, the derivative of sin(x) is cos(x).

The fan will spin slower, attempt to pull more current than it would at 60 Hz, and may therefore overheat (or blow a breaker).

The time rate of change of the Magnetic field passing perpendicular to the loop.

V = - dPhi/dt = -AdB/dt.

these are circuits that manages tha functioning of the system or in other words are the ones that helps in the proper functioning of the system.