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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 is the input and output voltage range of ic7408?
A: The answer deviate from IC to ic . It is defined not as voltage but rather as unit loads. In other words there is a limit to how many inputs can be tied together along with how many units can be driven for reliable operation. So basically is a question of current sink and source for both input and output which strictly relates to reliable triggering voltage levels. If I remember i used the 8 for unit load for the input and 40 unit load for the output. These numbers are general use for design.
Why the generation voltage is 11kv not 10kv?
Alternator output voltages are typically restricted to around 25 kV to limit their physical size and the centrifugal forces to which they are subjected. In the UK, this voltage is then typically raised to 400 kV for transmission.
The voltages to which you are referring to are typical of the voltages used in the UK's high-voltage distribution system. 'Grid' substations typically transform transmission voltages of 132 kV down to 33 kV (or, less commonly, 66 kV), and 'primary' substations then transform distribution voltages of 33 kV down to 11 kV.
The transformer size is calculated by using the load current that is required on the secondary side of the transformer. This secondary current is multiplied by the secondary voltage times 1.73. This total is then divided by 1000 to give you KVA. KVA = I x E x 1.73/1000.
What happens if there is no neutral in smps circuit?
No neutral means no current and it doesn't work.
They are blown venturi tubes.
A small volume of high pressure air is blown over the curved "wing" of the Dyson ring. This air adheres to the ring via the Coanda Effect and transfers momentum to the air in the ring, creating a high volume of low pressure air.
he is one of welad el metnaka el sharamet el 7'awalat "koss omo ebn mtnaka ma3aras"
What are the classes of failures in a tranformer?
Biggest problems are the windings either having an open circuit or a short circuit.
Which is the device that converts AC to DC?
A Rectifier converts Alternating current into Direct current
What is horse power of a 415 volt 3 phase 7.5 kW electric motor?
Motors are rated according to their output power, never their input power. This is because it is the output power that determines the load the motor will be able to handle. The output power, of course, is lower than the input power due to the machine's losses.
In North America, the output power is generally expressed in horsepower, whereas its input power is measured in watts. In the rest of the world, the horsepower is considered obsolete, so both the output power and the input power are measured in watts.
As there are 746 W to the horsepower, your 75 kW output motor would be equivalent to approximately 100 horsepower.
How much power does a 3k generator have?
Well, it has so much power! It can harm your computer, so don't trust free downloads (Trust the big pay!) its worth it!
This question is gobbledegook and probably intended as harmless nonsense.
What is the main truck used in transformers?
Bumblebee - Chevrolet Camaro (classic)
Autobot Jazz - Pontiac Solstice (Hard Top)
Autobot Ratchet - Hummer H2
Ironhide - GMC TopKick medium-duty truck
Optimus Prime - 1994 Peterbilt
What is the resistance value and tolerance of a resistor with Brown Green Red Silver?
15 k ohms with a 10% tolerance.
A directional antenna issues wireless signals along direction?
the correct answer is single direction
What is the difference between lagging and leading power factor?
Power factor is the ratio of watts (true power) to VA (volt-amperes, also called apparent power). Where the load is resistive only, the power factor is one, or unity, because the voltage waveform and the current waveform are in phase. Thus, for resistive loads only, true power and VA are the same. Where the load is reactive, the load stores energy, releasing it during a different part of the cycle. This shifts the current waveform so that it is offset, or out of phase with the voltage waveform. Reactive loads can be inductive (electric motors), capacitive, or non-linear (rectifier power supplies). When the load is inductive, the inductance tends to oppose the flow of current, storing energy then releasing it later in the cycle. The current waveform lags behind the voltage waveform. When the load is capacitive, the opposite occurs, and the current waveform leads the voltage waveform. So, lagging vs. leading is another way of saying the net reactance is either inductive or capacitive. This is slightly simplistic, and what we are talking about above is really DPF, or Displacement Power Factor. Non-linear loads don't really shift the current waveform, they distort it. The current waveform starts to look like a square wave, and square waves contain harmonics. So non-linear loads add harmonic distortion, and this tends to mimic a capacitively reactive load, adding some leading power factor. So when we say power factor, we really must include DPF plus harmonic distortion in total. One memory aid that may help to remember all this is: ELI the ICE man The L in ELI means inductance. The E (voltage) comes first, then the I (current) lags behind. Inductive reactance produces a lagging power factor. The C in ICE means capacitance. The I (current) comes first (leads) then the E (voltage) comes later. Capacitive reactance produces a leading power factor. Remember, it's always the current waveform that is affected by the reactive load, so you have to think about whether the current is leading or lagging. Most reactive loads are inductive, so at most sites the PF is lagging. One cool tidbit is that capacitive reactance cancels out inductive reactance. So if we have a building full of motors, we can add a bunch of capacitors to improve our power factor, meaning we get as close to unity as we can. Thus we have power factor correction capacitors that are made just for this purpose.
Why is a motor rated in KW's and a transformer rated in?
The mechanical load of a motor determines the necessary output power rating of an electric motor. As mechanical loads are defined in terms of watts (or, in North America, horse power), then motor's output must be rated in watts, too.
The so-called 'power' rating of a transformer is determined by the rated voltage and the rated current of its secondary winding. The product of these two quantities is the transformer's rated 'apparent power', expressed in volt amperes.
Incidentally, the symbol for "kilowatts" is "kW", not"KW's"!
How was the french resistance successful?
The French Resistance was successful due to its ability to mobilize diverse groups against Nazi occupation, including civilians, workers, and communists, who conducted sabotage operations, gathered intelligence, and facilitated the escape of Allied soldiers. Their efforts disrupted German supply lines and communication, significantly aiding the Allied forces during World War II. Additionally, the Resistance played a crucial role in the liberation of France by coordinating with Allied troops during the D-Day invasion and subsequent operations. Their resilience and commitment to freedom inspired widespread support and contributed to the ultimate defeat of Nazi Germany.
Resonance refers to an effect in which the?
vibration of one object causes another object to vibrate at natural frequencies.
What is the total harmonic distortion of a Bose stereo system?
Harmonic distortion belongs to all amplifiers, loudspeakers and simply all electrical equipment you use. When it comes to audio, the only effect you will hear is a constant resonant low noise if the speakers aren't good at handling harmonic distortion. None of the Bose speakers I have tested so far produce that noise, so you don't have to worry about that.
