answersLogoWhite

0

📱

Electrical Engineering

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

23,056 Questions

Is the turns ratio of transformer the same as the ratio of voltages across the transformerwhy or why not?

In general the turns ratio is equal to the ratio of voltages. A few turns might be added to the secondary to provide extra voltage to offset the voltage drop caused by the resistance of the secondary when the transformer is supplying a load.

Another AnswerFor an 'ideal' transformer, the answer is yes, and the reason is based on the e.m.f. equations for a transformer which, for the primary winding is: Vp = 4.44 Np f x flux

...and, for the secondary winding is: VS = 4.44 NS f x flux

Since the frequency (f) and flux is common to both windings, dividing one equation by the other will result it:

VP/VS = NP/NS

So, as you can see, the voltage ratio and the turns ration are the same.

Is shunt a bypass resistance?

It is the resistance across the cell to invoke a constant draw. This makes the cell work efficiently under ideal conditions. To do it properly new cell management systems measure the temp. and voltage output and put a load on the cell that makes it work best.

A circuit diagram consisting of diode and transformer?

This is probably a half-wave rectifier.

Rectifiers are used to convert AC to "DC". A half-wave rectifier can be constructed with a transformer and a diode connected between the positive terminal of transformer secondary and the load. This doesn't provide DC power to the load, but instead blocks the negative portions of the AC signal and only allows current to flow into the load while the AC voltage is positive. A capacitor is typically connected across the load to smooth out the voltage, making the input to the load more DC-like. The capacitor charges up when the AC voltage is positive and the diode is conducting, then discharges through the load when the diode is not conducting. This is still not DC power since there is a certain amount of ripple, or variation in the load voltage. Selection of the capacitor value is important to reduce ripple to an acceptable level. The transformer is simply used to change the AC voltage to whatever is desired.

The half-wave rectifier is a very simple circuit. Other kinds rectifiers, for instance a full-wave rectifier, offer better performance.

How do you work out the scale of a drawing?

Not all drawings are done to scale, sketches of buildings and people for instance. However if it is a technical drawing the draughtsman/woman will state on the drawing the scale used.

Why does your gfci keep tripping after 15 minutesI suspect the circulating motor in my spa.?

The GFCI is sensing stray electricity. Usually, there is no GFCI connected to the pump motor. The GFCI devices would be associated with the air blower, or the lights. If it is the circuit breaker, then there may be a problem with the circulation pump or the circuit breaker itself. A qualified electrician will be able to locate and correct the electrical problem. A pool repair tech may be able to do the same and also correct the problem if it is the motor.

Ken

How do you change rotation on a single phase motor crompton parkinson class e?

You need to reverse the polarity of starting winding. You need to open the terminals. Get expert help.

Does the voltage of alternating currents from a power plant need to be boosted or increased before it can enter a home?

The AC (alternating current) voltage from the power plant must be dropped, or transformed, down to an acceptable level before it can enter a home.

Power plants generate incredible amounts of power (electricity and current = power), that is difficult to distribute because of such massively high power. The method to do so is to generate the power with the highest voltage possible, which lowers the current proportionally. Hydro lines consist of wire conductors, all conductors pass electricity imperfectly due to resistance. Resistance converts power into heat as the electricity travels from the power plant to its destination. To minimise this loss, high voltage/lower current power is sent along the lines at voltages in excess of 220,000 volts along huge towers seen marching across the land.

This unusably high voltage must be converted into something more reasonable, so it ends up at a switching station as an important part of the electrical grid, at which point it is transformed to a much lower voltage at high current. Once it is distributed to area neighbourhoods, this voltage is again transformed to a lower voltage and much higher current.

Here's where a balancing act comes in. With the various voltages from "line loss" and the many transformer stations, it can result in a wide range of voltages when it reaches a given neighbourhood. Once it gets there, a transformer is matched to this end voltage that will provide the typical voltage of 220 and 115 volts. For factories, malls and industrial locations, voltages such as 600v, 480v, 277v, 220v, 208v and 110v is available.

A long answer to a short question - hope it's helpful.

Peace!

Dave

Comment

The main reason that energy is distributed at high voltages is to prevent enormous voltage drops from occurring along the line; a secondary reason is to enable us to use realistically-sized conductors; the reduction of energy or line losses is a bonus rather than a reason.

What is hold in winding?

Hold in winding refers to the specific winding configuration in an electromagnetic device, such as a relay or solenoid, that maintains the position of the armature or movable part when the device is energized. This winding generates a magnetic field that keeps the armature in place, preventing it from returning to its default position until the power is removed. The design ensures that the electromagnetic force is strong enough to hold the armature securely during operation.

What is working principle of UTM?

The Universal Testing Machine (UTM) operates by applying a controlled force to a test specimen to determine its mechanical properties, such as tensile strength, compressive strength, and elongation. It typically consists of a load frame, a testing chamber, and a load cell to measure the force applied. The specimen is placed between two grips, and the machine either stretches or compresses it until failure occurs, while recording the force and displacement data. This data is then used to generate stress-strain curves, which help in analyzing the material's behavior under different loading conditions.

Why are generators connected in a star configuration?

Generators are often connected in a star configuration to facilitate balanced loads, improve voltage stability, and reduce harmonic distortion. This configuration allows for a neutral point, which can help manage unbalanced loads and provide a reference for grounding. Additionally, it minimizes the amount of insulation required for the winding, making it more efficient for high-voltage applications. Overall, the star configuration enhances the overall reliability and performance of the power system.

What is the Fourier Transform?

The Fourier transform is a mathematical transformation used to transform signals between time or spatial domain and frequency domain. It is reversible. It refers to both the transform operation and to the function it produces.

What rule of thumb is used to indicate the amount of time it will take a capacitor to charge to the source voltage if there is a resistor in series with the capacitor?

A: Mathematically speaking the capacitor will never charge to the source because it takes one time constant to reach 63% and so on but for practical uses it is assume to be fully charged in 5 time constants R X C = 1 TIME CONSTANT

Can moving coil galvanometer be used to detect ac in a circuit give reason?

Moving coil galvanometer is used to detect unknown resitance of the both ac or dc circuits :)

deepak instrumentation engineer

Answer

A 'galvanometer' is simply an instrument that detects and measures small currents; 'moving coil' describes its operating principle. A moving-coil galvanometer is a d.c. instrument; if subject to a.c., then it will simply vibrate as it will not be able to respond the the frequency (unless the frequency is very low, in which case, it will sweep back and forth in step with that frequency).

The moving-coil principle is applied to other instruments, and can be used in the construction of multimeters. In the case of a multimeter, a rectifier circuit is incorporated so that it can be used to measure a.c. currents and voltages.

What is primary reactor?

This item is normally seen in electrical switch gear (or called "Starter "/ "Motor drive") . This device is to reduce the inrush current during motor starting. Another item "Line reactor" .

Led circuit for 120 volts?

There can be no answer for this without knowing how strong a resistor is involved. (Ohms)

How do you calculate XL-PE cable size for 6.6 KV 300 KW motor?

Find out how much current the motor draws, then look up wire tables to find out the size of wire. Ask an electrician if you are not unfamiliar with this because working at 6.6 kV is definitely lethal for the unqualified.

Troublshooting a low power output complaint on cummins?

Start by verifying proper fuel system operation, then check compression output on individual cylinders.

What is included in phase 1?

Phase 1 typically includes initial activities such as project planning, feasibility studies, and preliminary research. It often involves defining objectives, identifying stakeholders, and outlining key deliverables. Additionally, this phase may include gathering baseline data and establishing timelines and budgets. Overall, it sets the foundation for subsequent phases of the project.

Can peak overshoot be in negative?

OF Course it can ,it is named undershoot in that case .

Do a search and you will understand it better

Is it possible to create friction with the rotation of the Earth to create energy?

There are several problems with your question-- namely, that friction doesn't "create" energy; nothing can (except via the mass-energy-equivalence formula). Friction would actually be more accurately be defined to be the force that causes the change of energy into heat energy. If you're asking if it would possible to create some kind of energy generator using the Earth's rotation as the power source, then I'm not entirely sure that would be possible. For one, you would somehow need to make the generator independent of the rotation of the Earth by hanging it either under some kind of balloon or in space-- both of which ideas seem highly tedious as cheaper and more available sources of energy exist (sun, wind, waves, etc.). Then you would need to set a kind of giant wheel on the Earth to power the generator as the Earth turns... I'm almost certain many countries will be adverse to the idea of a giant space wheel crawling across their territory once a day. A slightly more plausable idea would be to use Earth's natural magnetic field as an induction electricity generator. But who knows, maybe a couple years in the future you'll win the Nobel prize for this idea and I'll be sitting here saying, "hey! That's the guy I discouraged on the internet!". Good luck!

What is a 32 bit counter?

This is the the thing for micro controller . Normally in microcontroller operation we used to give the clock pulse to connected circut chips .One chip requires 4 clock pulse .then the second, third vise versa . By which the pulse starts from 4 is for first chip, 8 is for second chip(4+4), 16(4+8+4) is for thir.............Like that depending upon the requirement of the clock signal for chips we used to tell 16 bit counter , 32 bit counter ect.