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Electrical Engineering

Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.

23,056 Questions

What is transient current?

Transients can be currents or voltages. They occur momentarily and fleetingly in response to a stimulus or change in the equilibrium of a circuit.

Examples of Double SideBand and Single SideBand applications Elaborate your answers?

Explain the difference between the various forms of a.m & f.m and which jutifies the radio station's choice of modulation for each waveband?

What is the difference between electrical and electronic?

Electrical engineering would include such things as transformers and switchgear, conductors, motors and generators; and almost always concerned with the energy component of electrical systems. House and automobile wiring and systems including lighting would also be included.

Electronic engineering is mainly concerned with the information concept of a circuit. Such items such as radios and transmitters, radar and computers, and in general the control of electrical impulses to effect some change. Low energy relays would also be considered part of electronics, for example the suite of relays controlling an elevator system. In general the information component is the focus, rather than the power components.

In short: electrical circuits handle transfer of energy - electronic circuits handle transfer of information

What is the output voltage of a transformer if the turns ratio is 0.5?

It is a Step-Up Transformer which has 2 times voltage in secondary(HV) than primary(LV)

What Is Automatic Transformer SwitchATS?

A transfer switch, in general, switches load between two sources. An automatic transfer switch or ATS is usually installed where a generator is located to allow the generator to give power while electricity is out.

What are the parts and components of a cordless electric drill?

There are only a few parts and components that separate a cordless electric drill from a corded electric drill. Having a battery instead of a cord is the biggest difference.ÊÊ

1 mv is equal to how much kv?

In the abbreviation scheme that I am familiar with, 1 mv represents 1 millivolt, or 1 X 10 -3 volts. 1 kv represents 1 kilovolt, or 1 X 10 3 volts. So 1 mv would be 1/100,000 of a kv.

Which is more reasonable using a sine wave or square wave signal to determine slew rate?

It is more reasonable to use square wave rather than sine wave signal to determine slew rate. Both signal sources serve as a functional generator with the sine wave providing high purity waves.Ê

What is the difference bw logical and physical synthesis?

Logical synthesizes maps a register-transfer levelÊdescription to a set of gates. Physical synthesis implements a netlist on a floorplan and improves the quality of the design.

7 What is your greatest weakness?

I FOUND MYSELF WORKING LONG HOURS(OVERTIME WITHOUT PAY) WITHOUT NOTICING IT.

What is parasitic resistance?

Parasitic resistance is resistance that you encounter in a circuit board or integrated circuit but not included in the original design -- an undesirable, unintended consequence of putting a concept into manufacturing. Since parasitic resistance does exist, you need to estimate its value and make sure the design still functions as intended. An example of parasitic resistance is the resistance of the traces in a circuit board or metal interconnects in an IC, the purpose of which is to connect components electrically according to the circuit diagram, but these connecting structures are not ideal. These connecting structures most likely also add parasitic capacitance and inductance to your design and, if substantial, should be included in your design (back-annotation) accordingly.

What is a water cooled shunt?

A shunt is an electrical conductor joining points of a circuit, into or out of which current can be diverted. The water-cooled refers to the way it's kept cool, as insulation is not provided.

How does definite time Over current relay work?

These! relays operate at a constant time predetermined by adjustment

and are independent of current magnitude as long as it is sufficient

to operate the relay. The time-current characteristic is shown by curve

D in Fig. 2.

These days are generally us&l for radial circuits or for those loop

circuits which have a few sections in series and there is no difference between

the fault current at the end of one s~&on and the beginning of the next

one. This relay is also used for back-up protection to differential and

distaze relays.

If there are several sections in se&s, say more than three or four,

the time of operation increases as the fault location moves closer towards

the source of power and thus the heavier faults get cleared in longer times.

Nom - The resetting current or time or both arc important where hi

is uSed or if the breaker is not supposed to trip. There is a poleibility 8!2zz3

condition may cause the overcurren t relay to operate but a return to normal condition

for a relay wth a low resetting current or a high resetting time is not possible and an

undesired operation may result.

This relay 'may also be advantageously used qn systems where the

Eault current at a particular point varies widely due to the changes in source

impedance, as there is relatively small change in time with the variation of

Gult current.

For earth-fault protection, if the fault current is severely limited

by neutral impedances or by arc or earth resistances, which is often the

case in industrial plant systems, the definite time overcurrent relay may be

used to facilitate co-ordination between two successive sections. In such

cases it is recommended to use relays with similar charact&istics.

What is thumb rule related to magnetic field and current?

THUMB RULE:

If we put our one thumb in the direction of magnetic flux passes through the conductor,then the movement of the fingures denotes the direction of current flow.

What is the use of isolation transformer in UPS?

It will segregrate the Battery unit and power supply unit,seperate.----Arun

Who invented the led light bulb?

"Nick Holonyak, 75, invented the LED (light emitting diode) in the 1960s."

What is the difference between a 100watt and a 75 watt bulb?

The amount of light produced and the amount of power consumed. A watt is a unit of power and electrical power is determined using the formula: P = I2*R , Where P is power, I is amps and R is resistance. But using Ohm's law ( V = I * R) the following can be obtained: P = V2/R , Where V is voltage. In US house holds the standard voltage is ~120V, changing the resistance of the filament of the light bulb will change the amount of power consumed and therefore the amount of light produced. The higher the wattage the lower the resistance of the filament. Filaments are used in standard incandescent light bulbs and not in fluorescent tubes or LED fixtures.

Detail specification of transformer oil used in 132kv and above transformer?

Insulating oils for general application which are covered by this specification are manufactured from predominantly naphthenic base crudes. Distillates from these crudes may be acid refined, hydrogen treated, solvent extracted, or processed by other suitable refining methods to yield acceptable mineral insulating oils which meet the test requirement at the point of delivery. Oils from paraffinic crudes may also be covered by this specification with the exception of performance at low temperatures. Other requirements may be needed for these products to ensure proper function at low temperatures. The use of all additives must be identified. An additive is a suitable chemical substance which is deliberately added to a mineral insulating oil to improve certain characteristics. Uninhibited oils must be free of additives, either natural or synthetic that are used to improve oxidation stability. This includes but is not limited to 2,6 ditetiary-butyl phenol, 2,6 dietertiary-butyl cresol, or metal deactivators such as benzotriazole and its derivatives.

Inhibited oils are insulating oils which have been supplemented with either 2,6 ditetiary-butyl phenol or 2,6 dietertiary-butyl cresol or any other specified and acceptable oxidation inhibitor. If an additive other than 2,6 ditetiary-butyl phenol or 2,6 dietertiary-butyl cresol is used, appropriate limit values for oxidation stability tests (those for Type I or Type II oils) should be agreed to by the purchaser and seller. If more than one additive is used, the more stringent limits for oxidation stability, those for the Type II oils would apply.

Pour point depressants, gassing tendency improvers, additives for corrosive sulfur and static electrification (metal passivators), antifoaming agents and other additives

All additives should be specifically identified or at a minimum identified by class of compounds such as metal passivator if the specific information is proprietary. Insulating oils covered by this specification shall be produced from proven crudes by suitable refining techniques, both of which shall have been approved by the purchaser. After such approval, no change in crude source, processing, or refining methods shall be made that results in a substantial change in the product characteristics without the prior approval of the purchaser.

Shipping containers should be dedicated to new transformer oils. The shipping method and containers shall be agreed upon by purchaser and seller and shall not be changed without prior approval of the purchaser.