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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
The frequencies 88.1 - 91.9 FM are?
Generally FM radio range is from 88 MHz to 108 MHz. Frequencies are issued to commercial broadcasters by a government authority. Broadcasters need a licence to use a frequency. This description may change depending on the country.
Ohm's Law says
Voltage = Current x Resistance
V = 5 x 24 = 120 V.
Is it possible that two machine have same size have different output?
yes it is possible because if two machine have same size but there types are different then there out will be different.and also ifone is new and other is so older then the out put will be different.and also if one machine is run under low voltage then there out put will be different...
What is type of current that transformers require to operate?
As a transformer requires an alternating magnetic flux within its core, then the current flowing in its primary winding must be alternating.
What is the cause of fluctuation in amps and pf in a 6000hp syncrhonous motor?
When the line voltages of a polyphase motor induction motor are not equal, unbalanced currents in the stator windings will result. A small percentage voltage unbalance will result in a much larger percentage current unbalance. Consequently, the temperature rise of the motor operating at a particular load and percentage voltage unbalance will be greater than the motor operating under the same conditions with balanced voltages. NEMA Standards MG 1-1998, 12.46 recommends against operating a motor with a voltage unbalance greater than 1%. This will increase operating temperature, vibration, nuisance trips and failures.
Is the real world load purely series parallel or series parallel type?
This question does not make any sense. "Real world" load, from the perspective of the power producing generator, can be reduced to a lumped resistance in series with a reactive component (either inductive or capacitive). In reality, the load connected to that generator has series elements and parallel elements.
Can you use ordinary transformer in place of auto transformer?
yes we can place auto transformer in place of original transformer
How iron area is decreased when flux density is more?
Your question is unclear, but flux density is a function of the cross-sectional area of the magnetic circuit in which the magnetic flux is established.
Flux density (symbol: B) is defined as 'the flux per unit area'. If the flux is measured in webers (pronounced 'vay-bers') and the cross-sectional area is measured in square metres, then the flux density is measured in teslas(symbol: T) which is a special name given to a weber per square metre.
Yes, but they're not 'phase' conductors, they're 'line' conductors.
Can you use three phase thermal overload relay in a single phase system?
Yes, when using a three phase contactor on single phase, the three phase overload block can be used. The wiring of the contactor consists of taking L1 of the supply and connecting it to L1 of the contactor. The load is connected to T1 on the bottom of the overload block. L2 of the supply is taken to L2 of the contactor. Instead of connecting the T2 to the load, the conductor is taken back to the top and connected to the contactor in position L3. The other side of the load is connected to T3 on the bottom of the overload block.
The overload block has three N.C. contacts, one for each leg of L1, L2 and L3. These three contacts are wires in series to the stop - start circuit. Years ago on old schematic diagrams these contacts used to be placed on the up stream side of the magnetic starter's coil. When the overloads tripped the voltage was left on the control circuit which was found to be dangerous for trouble shooting. Now the overload contacts are positions on the beginning of the start- stop circuit so that when a overload trips, the whole stop - start circuit becomes de energized.
What is the difference between ohms and volts?
ohms is the unit of resistance while volts is the unit of voltage
Can you connect two phases together?
Please do not attempt to connect 2 phase wires together. You will most likely blow up your house, transformer and local substation. You will be charged a hefty fine, or sued for damage to the transformer, cables and substation which can cost hundreds of thousands of dollars.
If you are using 3 phase, each of the 3 phases are 120 degrees different from each other and can only be used for 3 phase industrial appliances and machines. You can however balance your current load between the 3 different phases by using each of the phases in conjunction with Neutral and/or Ground.
Please contact a qualified electrician where 3 phase is concerned, as you can kill yourself instantly if 2 of those wires make contact. Your neighbours will think you're lighting fireworks by the likes of the multi coloured sparks, bangs and explosions. And the entire neighbourhood will most likely be without electricity until the power company can find and fix the problem you would have created.
AnswerPresumably, you mean 'lines', not 'phases'? The conductors are called 'lines'; 'phases' are the loads connected between line conductors.Most residential buildings are provided with a single-phase supply, comprising (in Europe) a single line conductor and a neutral conductor or (in North America) two line conductors and a neutral conductor. If you directly connect a line and neutral conductor together, or two line conductors together, the resulting short circuit will cause the circuit's protective device (fuse or circuit breaker) to operate and immediately disconnect the supply -you will most certainly not 'blow up' your house, entertain your neighbours to a 'firework display', damage the supply transformer, or disconnect your neighbours! And you will notbe fined, either!
Having said all of this, you shouldn't get into the habit of connecting any pair of conductors together for the sake of your own safety!!!
The answer is D.
Why is it 1000W? How did you get that answer?
What is built across a river and produces renewable energy?
A dam or a water wheel to produce electricity from the water flow. Hooweestik.
How do you increase the ampere?
To increase (or decrease) the current (ampere) of a supply several methods can be used:
1) For an AC supply use a transfromer.
2) For a DC supply use a DC regulator, or switched mode regulator
In either case the conservation of energy law must be maintained. Meaning you get as much energy out as you put in. In other words if you increase the current the voltage must decrease but the power will stay the same (for a perfect conversion).
What is swinburne's test of DC shunt motor?
swinburne's test on dc shunt machine is to predetermine the efficiency of the dc machine , but it is not accurate it is just like estimation of efficiency of dc shunt machine when it is run as a motor and a generator............................
Can the terminal voltage of a battery be larger than its emf?
the voltage of a battery could be larger than the emf if you are to charge the battery, in that case V=E+Ir .
