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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
Motor will rotate at very high speed leading to destruction
Answer from Kinindia.com
What are the factors causing a permanent magnet generator not to generate emf?
A magnetic field will not generate an EMF if there is no motion, so the primary factor causing a permanent magnet generator to not generate EMF is if it is not turning.
What is difference between an AC and DC flux?
As happens with voltage and current, flux is steady for dc but keeps altering for ac.
A transformer works through the ac flux in the magnetic core.
What is principle of Current transformer?
why does have to short-circuit secondary wire of current transformer ?
If 10 coulombs of charge passes a specified point in 2 seconds how much current is flowing?
10/2 = 5 coulombs per second = 5 amperes.
It is an electric generator driven by a rotating shaft that generated electric power in three-phase form. The other name for one of these is an alternator.
Alternators are used almost exclusively to generate electric power in power plants across the world. The power is then transformed to appropriate voltage levels on its way to the consumers.
An alternator has a set of three pairs of fixed coils on the stator, and a single coil fed with direct current through slip rings on the rotor.
Alternators are also used to generate electric power in cars. In this case the power is fed through a full-wave rectifier using six diodes to connect the power directly to the car battery. The voltage is controlled by an integral device attached to the alternator that controls the current fed to the rotor. Current for this is taken from a half-wave rectifier using another three diodes, and it is passed through the ignition switch.
Which type of oil should be used in transformer?
Environmental safety in case of spillage.
- There has to be a dyke wall for oil containment in case of spillage so that the oil does not get into ground / land.
- Oil level must be maintained at required level with a suitable breather and Silica gel arrangement
- BDV of the Oil must be regularly tested and minimum value must be maintained.
- Oil Cooling arrangement must be maintained.
- No leakage in radiators.
What is circuit that is complete and unbroken with flowing electric current?
Yes, as long as the unbroken path is a good conductor of electricity.
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.
