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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
Is a principal of KV a gazzetted officer?
I'm an employee of Kendriya Vidyalaya Sangathan. The Principal of Kendriya Vidyalaya is not a gazetted officer because KVS is an autonomous body under Ministry of Education. Hence, an employee of any Autonomous body is not a gazetted officer. Hope, my answer clears your doubts.
True or false in a series circuit circuit current is the same throughout the circuit?
A series circuit only has one loop
What KVA transformer is needed to convert 480v - 240v 13.5A load?
Ohms law says that watts are equal to volts times amps.
240v X 13.5a = 3240 va
VA / 1000 = Kva
So, your load requires 3.24 Kva. The transformer should have a rating greater than this as a safety factor, so you would choose the next larger size, in this case probably a 5 Kva transformer with a 480v primary and a 240v secondary.
Your local electrical codes may require a larger safety factor, so you would want to consult them before buying the transformer!
Why power is measured in terms of kva in ac supply?
It simply the product of r.m.s current through that conductor and r.m.s voltage across the conductor and the neutral/ground. We can measure the voltage with help of voltmeter and current with help of ammeter.Both these meter measure these quantity in r.m.s mode.
Why Equivalent Circuit of real Transformer connection in series and parallel?
Without knowing what they is, nobody will ever be able to answer your question.
How do you change a 220V 50Hz electric water heater to 60Hz 220V?
Not without spending a great deal of money. Appliances with motors and timers at 50 Hz would have to be changed out to 60 Hz components. Appliances that are strictly of a resistive nature will operate without any problem.
Which plastic is used for making wire insulation?
Electrical insulation on a wire or cable composed of plastic. Most wires and cables use plastic insulation.
Some other types of insulation used on wires and cables are: enamel, cloth, natural rubber, gutta percha, ceramic, etc.
Application of induction motor in industry?
Induction motor used in industries for variable speed machines . Induction motor has always lagging power factor. Less cost compared to syn. Motor.
Which circuit has different parts of the circuit on separate branches?
Any circuit that even has more than one branch is a parallel one.
Is ohms law applicable to all the current carrying conductors?
Ohm's law is a linear approximation for the voltage versus current across a conductor. This approximation works very well for good conductors (like metals) as well as poor conductors (like wood), but not very well for semi-conductors (like Silicon).
Why is it necessary to phase Hooke type universal joints connected to a prop shaft?
The effect of changing velocity can be eliminated by phasin the hookes joint
Akray
What is the lumen output of a 60W incandescent bulb?
The output of bulbs varies. A typical output of a 60W incandescent bulb is 680 lumens.
In the electrical circuit what does this symbol M mean?
The symbol for MOTOR is the circle with an M in it.
Hoped I helped :)
What is the length of a conductor?
It would depend on both the actual length or size of the conductor itself, and the strength and, or origin of the heat, light electricity, or sound.
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Answer #2:
The conducting traces in some LSI integrated circuits are nanometers long,
whereas intercity utility transmission lines may be hundreds of miles long.
I can't see how the strength or origin of the heat, light, electricity, or sound
has any effect on the length of the conductor ... unless you're measuring the
conductor in terms of wavelength.
The real power in a DC system is the product of voltage & current. P = V * I
In an AC system the power is equal to V * I * power factor. The power factor allows for the fact that the power is less than the volt-amps. This happens when the voltage and current are out of phase, i.e. if they reach their peak value at different points in the AC cycle. In fact if the phase difference is exactly 90 degrees, no real power is transferred at all, although the transmission wires still have to carry current and produce power losses as a result,
The real power (in watts) is defined as the volt-amps times the cosine of the phase difference between voltage and current. Using the convention of complex numbers, the 'imaginary' power (in volt-amps-reactive or VAr) is defined as the volt-amps times the sine of the phase difference.
The three quantities are connected by the Pythagoras formula:
(VA) squared = (watts) squared + (VAr) squared.
Why a transformer designed for a 120V AC input will often burn out if connected to a 120V DC source?
All transformers are designed to work on AC. They do not work on DC.
If you connect an inductor to DC, the current will increase until the capacity of the source or the conductance (1/resistance) capacity of the inductor and conductors is reached. Often, this condition will overheat and destroy the inductor, or destroy the source. A transformer is not an exception, as it is a form of inductor.
What muct be known to calculate current using Ohm's law?
I(current) = V(voltage)/R(resistence) Example : 220 V / 5000 Ohm = 0.044 A (Ampère) = 44mA
What costs less central ac on 220 volts or window ac on 220 volts?
How big a space are you trying to cool?
How hot does it get?
How cold do you want to make it?
The reason "it depends" is because 220v AC units are typically much more powerful than the corresponding 110v units - you can check this by looking at the cooling capacity rating - in the US, measured in "BTU"s - the more "BTU"s of cooling, the more powerful the air conditioner.
On one hand, trying to use a smallish "5,000 BTU" window unit (typically 110 volts) to cool a large living area that gets rather hot is an exercise in futility. You can run it - consuming electricity - until the cows come home and it may never do the job.
On the other hand, using a 30k / 40k BTU "wall unit" 220 v AC unit in a 9x12 bedroom will rapidly turn it into a deep-freeze - and waste energy in the process.
Once you decide how big an area you want to cool - in square feet - any reputable appliance dealer should be able to help you pick out a unit correctly sized for the space.
How do you do a megger test on a current transformer?
The megger test on a generator is usually done to check the insulation factor of a generator. The high voltage is usually used to test the insulation system of a the generator in question. It is recommended to do this test after every six months.
How does a isolating transformer work?
Isolation transformers are used to isolate one circuit from another. Highly sensitive circuits may require isolation from high power circuits, for example.
Where are powermate generators made?
They are made in China for a company located in Illinois named Great Lakes Technologies. If you want heavy duty, I would look somewhere else. The same
company has another brand name called Wen.
How does single phase induction motor varies from 3 phase induction motor?
All induction motors require a rotating magnetic field in order to drive their rotors. Unlike a three-phase motor, a single-phase induction motor does not have a naturally-rotating magnetic field set up in the air gap between the stator and rotor and, so, this rotating magnetic field must be artificially created by stator windings that are roughly 90 degrees out of phase with each other. In most cases, this is done by inserting a capacitor in what is termed its 'auxiliary winding'.
Why do we use bus bars in electrical system?
Bus bars are used in Motor Control Centers (MCC) and high voltage switch gear. These copper bars are used in place of wire that would be hard to bend and fit into tight cabinet spaces. The copper bars are easily formed into odd shapes toaccommodate connections of the incoming power source to internal equipment. The bars are easily extended if another section has to be added on for future expansion. In an MCC, if more motor sections are needed the new panel is just bolted to the old bus bars for a continuation of the power to the new section. Because of the amperage of some equipment, single wire just does not have the capacity to handle the current.
What does a Rotating magnetic field do?
The Field which is continuously rotating with a particular axis is known as rotating magnetic field. It will be created in Three phase induction motor's stator. When the supply is given to stator of three induction motor, the flux of each phases (that are displaced by 120 degrees) will interact. Due to this the resultant Field will be rotating Magnetic Field will be Produced.
