Electrical Engineering

current openings for electrical engineer fresher in Delhi based core companies???????

yes

A ground fault circuit breaker essentially senses the difference currents flowing in the incomming & return wire of an electrical supply circuit.

In normal cases ideally the difference must be zero or very close to it. Whenever there is a fault & the electrical path also takes any other route e.g a operator who has accidentaly touched any live part of the equipment, there is a current flow imbalance in the input & return path of the electrical supply circuit. This imbalance is sensed & used to trip the main electrical circuit & thereby limits the Intensity & Duration of the Electrical current flowing through the operator. This results in the operator feeing a small jolt instead of a nasty or hazardous electrical shock.

From the above it is obvious that ground fault circuit breaker is essential for safety of the operator especially where the applicance is working with water or in watery surroundings & there is every chance of the water or operator accidentally comming into contact with a live electrical circuit & thereby create a safety.

You can us a satellite or even a wire coat hanger.

The performance curve can be a graph of torque versus speed. The torque is zero at zero speed and also at the synchronous speed.

Normally an induction motor operates at 90-97% of the synchronous speed, where the slip is between 10% and 3%. In this region the torque is proportional to the slip. As the torque is increased the speed falls until the motor stalls and the speed drops to zero.

Below the stalling speed the torque rises between zero speed and the stalling speed. Because the torque is 0 at 0, a single-phase induction motor needs a separate starting winding fed by a starting capacitor to produce a little positive torque that starts the motor.

I am doing an apprenticship in mechanical engineering. Im in the drawings office. Just doing my Btech and that in mech eng and i have been told £24k when finished at college, Not highly accurate, but hope this helps

It's installed on the high-voltage side.

110v 40 uf

Three-phase, pad mounted, transformers are normally 'pressure tested' i.e. subjected to a DC over-voltage for a specific period of time, using high-voltage test equipment rather than a megger as a megger's output voltage is usually far below the voltage-levels required for testing such transformers. The voltage/duration is in accordance with the transformer's relevant specifications which takes into account its windings' rated voltages. Pressure testing is performed in factory/workshop and after installation before commissioning.

DC is used for extra-high voltage transmission systems, as there are less losses with DC than with AC, and no synchronising problems.

its is the process of control stress, depress, tension

See related links below.

Yes

A one gang switch is like an ordinary switch box in your home. When there is more than one box, the electrical terminology used is ganging the boxes together. Two switches side by side in a single box is expressed as a two gang box. Three switches side by side in a single box is a three gang box.

A single phase circuit is a circuit that gets is supply voltage from a single phase supply system. In North America the single phase supply voltages are 120/240 volts. A single phase circuit can also be supplied from any two legs of a three phase system. The most common voltages in North America from a three phase system are 120/208 volts.

The speed of a generator only effects the frequency. Most generators operate at 1800 RPM. The output voltage is controlled by varying the field excitation voltage.

capacitor start induction run motor

The DC between windings is analogous to DC on capacitor plates. Windings, like capacitors, require time to charge up to the applied voltage, at which, there will be a constant current. Since Voltage / current= Resistance, the Megohm reading will change/increase until the windings are fully charged to a quiescent, steady leakage current. When current is at a stable leakage level, you will have an accurate reading.

xfrmrman

For the same amount of power, a star or delta connection will use the same line current. However a delta connection supplies sqrt(3) times less current to the device on each of its connections because the voltage is sqrt(3) times more.

The apparent contradiction comes about because in a delta connection each connection to the line is shared between two connections to the device (Historikeren 20-07-2015).

Excitation is normally used to describe the current supplied to the field winding of a motor. A motor has a rotating armature with a coil that rotates in the magnetic field produced by a fixed field coil. The current in the field coil can be taken from a series or parallel connection to the armature coil, or (usually for larger motors) it can be supplied independently via some sort of controller. Excitation can be used to control the speed of DC motors or the power factor of synchronous motors.

URL = Universal Resource Locator

In an electrical system block diagram, it may be making reference to the source for more information, information that may require more space than what is allowed to print in a block diagram.

low resistivity and low melting point.

semiconductors

http://waterforoil.blogspot.com/2008/05/how-to-use-quick-splice-connectors.html

first be sure to reset the breaker handle to the off position. When a breaker trips the handle goes to a neutral position. After resetting the handle turn it tothe on position. If it trips again there is a short in the circuit. Find out which outlets are not workingand unplug anything that is currently plugged in to the outlets. Reset the breaker and turn it to the on position,if it trips again call a qualified electrician.

Lagging means the current is out of phase, lagging behind, the voltage. This occurs when there is inductive reactance in the circuit, such as with motors and transformers.