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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 happens if two motors are connected in series?
If one motor shuts down due to mechanical failure or if it is turned off, the other will continue running as the circuit is not broken.
IN SERIES, if one of the motors breaks down, the circuit will be broken and neither motor will run. IN PARALLEL, if one motor shuts down due to mechanical failure or if it is turned off, the other will continue running as the circuit is not broken. The only consequence of having two motor in series is it will run faster than the other as the power will not be evenly distributed between both motors because the internal resistances will differ as a result of living in an imperfect world.
Can you used other type of capacitor instead of electrolytic?
depends, there are nonelectrolytic capacitors but it might not work for your circuit. research what kind you need and then use the right ine :D xx
How far does DC voltage travel?
DC Voltage is kind of like water pressure. It needs a conductor (usually a wire) in order to travel. The same way you need a garden hose to carry water pressure. Voltage will drop due to resistance in a very long conductor if a significant current is being drawn.
Why you not usually use induction generator?
we do not use induction generator because it require an external source (synchronous generator) that provide reactive power to it.
Can you step up 12 volts AC TO 120 volts AC?
Yes this can be done with a step up transformer. Keep in mind that it is a 10 : 1 ratio. For every 1 amp that you want out of the 120 volt secondary there will have to be 10 amp input on the primary. This can lead to a very big wire size on the primary coil.
How do you install a capacitor to pool motor?
SOME ONLY HAVE 2 WIRES SOME HAVE THREE.. THE 2 WIRE IS GRAVY .. THE 3 WIRE THE ONE I THINK YOU HAVE IS EASY TOO THE TWO YELLOW GO TO ONE POST THE RED OR WHITE WIR GO ON THE OTHER POST
What do you understand by regulation in a transformer?
Regulation of transformer means percentage reduction of transformer secondary voltage due to transformer loading as compared to its no load voltage.
Another AnswerA transformer's voltage regulation is defined as 'the change in its secondary voltage, from no-load to full-load, at a specified power factor, expressed as a percentage of its full-load voltage, with the primary supply voltage held constant'.What is the difference between DC and AC?
The primary difference between DC and AC is the direction of current flow. In a DC circuit, all electron current flow is in one direction. In an AC circuit, current flows in one direction for part of the time, and in another direction for another part of the time. In the AC circuit, we'll see current flowing "back and forth" instead of the unidirectional current flow we find in a DC circuit.
DC is "Direct Current", and AC is "Alternating Current". In DC, the current flow is in one direction only. In AC, the current flow is constantly changing direction.
An example of DC is the output of a battery. An example of AC is the power present in a home electrical system.
The current whose magnitude and direction remains change called as alternating current.
The current whose magnitude and direction remain unchanged called as d.c. Current.
Immediate and catastrophic destruction of transistors and/or diodes. While that does not ALWAYS occur, it's certainly possible.
Start with the alternator. No doubt those diodes have been destroyed if a battery has been connected with reverse polarity.
How many types of earthing methods are there?
There are at least six types of earthing system, identified as follows:
- TN
- TN-C
- TN-S
- TN-C-S
- TT
- IT
The first letter indicates the type of earthing at the distribution transformer, with T (= 'terre') indicating that one or more points of the supply are directly or 'solidly' earthed (e.g. an earthed neutral), and I indicating that either there is no earth at all, or earthing is achieved via an impedance.
The second letter indicates the earthing arrangement at the electrical installation, with N indicating that all conductive parts are connected to an earth terminal provided by the utility company, and T indicating that the conductive parts are connected directly to a buried earth electrode.
The third letter indicates the arrangement for the earthed supply conductor, with C indicating that the supply's neutral and earthing conductors are combined, and Sindicating that the supply's neutral and earthing conductors are separate all the way from the transformer.
The fourth letter, S, indicates that within the installation, the neutral and earth conductors are separate.
(The TN-C-S system is also commonly known as 'protective multiple earthing'.)
What happens in a short circuit occurs in an electric circuit?
A short circuit is a condition whereby a point or section of the circuit offer a short path for current to return to the power supply. It occurs when two or more points or sections of the circuit touches each others (but only and only if that results in drop in resistance to such an extent that it causes excessive current to flow through.
What is resonance frequency in electronics?
The frequency at which the impedance of the circuit becomes zero is known as resonance frequency.
Actually at resonance resistance only presence in the circuit. That means the impedance of the inductor and capacitor will automatically vanish.
My husband is a heating and air tech and he checks and starts up air conditioners in all kinds of weather.
What are the types of noise which can occur in an electronic circuit?
THERE ARE MANY TYPES OF NOISE SUCH AS SOFT ,HARD,POLITE etc SOFT NOISE MEANS VERY LITTLE SOUND THAT COMES TO OUR EAR VERY SMOOTHLY. HARD NOISE MEANS VERY BOOMING VOICE THAT COMES TO OUR EAR VERY HARDLY (VERY LOUD). POLITE NOISE MEANS VERY CLEARLY AND LITTLE NOISE MEANS SOFT
What is difference between eddy current loss and hysterisis loss?
Whenever rotor cuts the magnetic field, emf is induced it. Due to this emf, some current may flow in the rotor. This current is called Eddy current which is unnecessary and considered a loss called Eddy current loss.
When a magnetic material is energised it follows B-H curve and when de-energised, it does not follow B-H curve. This difference is considered a loss called Hysterisis loss.
Why do engineers put power lines so that they are slack in hot weather?
in the winter season materials such as rubber insulators and copper wire shrink and in the summer they expand just like wood. Therefore slack is needed on powerlines in relation to the weather so there is a little give to them. Engineers have nothing to do with the slack in the lines, it occurs naturally. In the sunlight objects expand a little due to the heat. This goes for roads, bridges, sidewalks, shingled roofs and hanging power lines. They sag more in the summer than in the winter. Engineers actually have to find ways so that they wont get slack. This expansion and contraction of any given material will actually shorten the life of it over time, and it will have to be replaced more often.
What are the electrical appliance that use AC?
Neither.
AC is alternating current
DC is direct current
Either can be large or small
The transmission losses are greater for (non superconducting) DC power so in most applications the absolute value of DC current will usually be lower than those in AC systems.
What are the advantages and disadvantages of sequential circuits?
A An IC has only limited points to probe troubleshooting, a circuit which is discrete in essence have all the nodes available, however the IC has the advantage of small real estate requirement for the same function
How do you change the direction of rotation of synchronous motor?
A synchronous motor aways runs at the synchronous speed, which is the supply frequency divided by the number of pairs of poles in the motor.
For a 4-pole motor the speed is 1500 rpm (50 Hz supply) or 1800 rpm (60 Hz supply).
The mechanical phase of the rotor is liable to be a little unstable under changing load conditions.
How many 14 gauge electrical wires can you put in a 2x4 electrical box?
Answer varies. Is it a deep or shallow box? is there a receptical, a switch in the box as well? is it just a junction box? are they single wires or NM cable?
How do you know the voltage of a 3 phase panel box?
A 277/480V box should be clearly marked, but not always. The only way to be certain of a box's voltage is to use a voltmeter on it. This type of voltage is very dangerous. When voltages start to get this high, at best you may loose a finger or limb, at worst, you die. I recommend calling an electrician, who will be able to safely check this out.
What is diversity factor in electrical calculation?
Try to think of a diversity factor as similar to a noncoincidental load factor. If your thermostat phyically limits you to only using either heat or AC at one time, then you can simply use the largest of the two as your load factor. With diversity, think of a college campus environment. If you are in class then the odds are your TV, oven, microwave, etc back in your dorm are probably not being used. R, Bill
In AC current, its a quality measurement of voltage. If voltage is harmonious or "clean" you will see an equal wave length on both sides of your baseline. You can test and see this using an electrical scope.
