Electrical Engineering

No. Capacitance is determined by the area of overlap of its plates, the distance between them, and the absolute permittivity of its dielectric.

military ability he was able to mobilise formidable army which possesed gun thus they able to defeat the french.he used the

No, why because know, In an empty bulb holder the circuit is not completed and there for the flow of electrons will not take place obviously the current passage won't be there.

55

the body can act as a conductor

3.5C x 50 sq.mm cable means area of 3 core is 50 sq.mm for three phase main conductor & for neutral 25 sq.mm (area) has been taken.

Power factor in any circuit is the ratio of the load's true power to its apparent power. It's also the cosine of the phase angle. In L-R circuits, it's described as a 'lagging power factor', because the load current lags the supply voltage.

Steel is not used as an electrical conductor because, although it is a conductor, it's not a very good conductor -as is copper and aluminium, for example. A steel-wire core is used, however, to reinforce aluminium conductors on transmission tower lines

in 3 phase motor u1,v1,w1 give to the short terminal and remaining v2,u2,w2 give t0 the in coming power supply of 440v

any device that converts energy from one form to another usually electrical to mechanical by using the property of all electrical non-conductors, or dielectrics, that causes them to change their shape under the application of an electric field

formals to calculate exciation voltage of alternator

1hp = 745.7 watts

Copper brushes provided poor commutation as they moved from one commutator segment to the next. The cure was the introduction of 'high resistance brushes' made from graphite (sometimes with added copper). This 'high resistance' provided a gradual shift of current from one commutator segment to the next.

Partially referenced via Wikipedia

because we two different supply i.e a.c to the stator of synchronous motor and d.c to the rotor,hence we basically make opposite polarity by these two supplies.

Voltage is synonymous with 'potential difference', and cannot have a positive or negative value (in the sense of charge). So what you are describing is 'potential', which can. So, for example, a battery whose positive terminal is earthed or grounded will indicate a negative potential if a voltmeter is connected between earth and its negative terminal.

A motor that relies solely upon the impedance of the windings to prevent overheating.

The generation of Arc in high voltage lines takes place whenever the voltage is enough to allow current to jump across conductors by breakdown of insulator. Arcing mainly occurs when the insulation properties of insulators are permanently damaged resulting in complete system failure

fan is a capacitor start capacitor run single phase induction motor. since single phase induction motors are not self starters, caused by discontinuty in stator mmf. so to iniate rotation single phase supply is splitted 90 degree apart by a capacitor to convert it to a 2 phase motor, which produces a continued synchronously revolving mmf in stator to start the motor. cool !!

DONT KNOW AN OF THEM 10/4 over & out

A wattmeter has two coils: a current coil and a voltage coil. The current coil is connected in series with the load, while the voltage coil is connected in parallel with the load (just in the same way an ammeter and a voltmeter are connected). The wattmeter's polarity markings must be observed while making these connections -if the wattmeter reads 'downscale' (backwards), then the connection to either one (but not both) of the coils must be reversed.

In resin impregnation, any porous material is made impervious by filling its pores with the resin.

burn or burst

Phase diagram are also known as thermal equilibrium diagram or a consistutional diagram

1. Different uses of phase diagram are

2. prediction of phase

3. amount of phase

4.composition of phase