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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 intermediate frequency?
In communications and electronic engineering, an intermediate frequency (IF) is a frequency to which a carrier frequency is shifted as an intermediate step in transmission or reception. [1] The intermediate frequency is created by mixing the carrier signal with a local oscillator signal in a process calledheterodyning, resulting in a signal at the difference or beat frequency. Intermediate frequencies are used in superheterodyne radio receivers, in which an incoming signal is shifted to an IF for amplification before final detection is done. The intermediate frequency stays the same for all signals, for example 455 kHz in an AM broadcast receiver.
Conversion to an intermediate frequency is useful for several reasons. When several stages of filters are used, they can all be set to a fixed frequency, which makes them easier to build and to tune. Lower frequency transistors generally have higher gains so fewer stages are required. It's easier to make sharply selective filters at lower fixed frequencies.
What is fast transfer switches?
Fast transfer switches are devices used to maintain a constant power supply to a device. These are used in many manufacturing and refining companies, were losing power can result in damage to the product, and equipment producing it. They assure that if there is an issue with power on one line, it automatically switches to another to keep things running.
Answer:
Transformer name plate shows the rating of the transformer...viz., operating frequency, rated current n voltage, output power in KVA, type of insulation used, tranformation turns ratio...
Additional Info: in addition to that, you would also find the percent impedance, size of the tank, tap configuration, and vector group. Here is photo of a typical power transformer nameplate: http://www.jcmiras.net/jcm2/p20.htm
What is electrolytic tough pitch copper?
The Electrolytic-Tough-Pitch or ETP is the most common copper among theÊthree specifications of copper. The common name of ETP is C11000.
Standby current is the current that a device draws when it is not actively performing its function. This current would be measured in amperage, and commonly amperes, milliamperes or microamperes would be the units of measurement. As an example of a device drawing standby current; a radio transmitter may not be actively transmitting, but the power supply is turned on, and the transmitter is ready to operate. In this case, the transmitter is drawing very little power. A computer can be in standby mode and drawing "standby current" , examples of which are also "hibernation" and "sleep" modes. The computer display and hard disk drives are turned off, and the CPU is throttled down to low power state. However, memory is kept active, which requires just a small amount of battery power.
Basic principle of commutator motor meter?
It is based dynamometer principle with ironless motor with a wound armature having a commutator. The two coils are connected in series with supply and armature coil is connected in parallel to it.
How much torque does a 150 hp electric motor have?
A 150 HP electric motor will have approximately 280 foot pounds of torque output. Torque is used mostly at low speeds to get loads moving.
LOAD FACTOR = AVERAGE LOAD ÷ PEAK LOAD AVERAGE LOAD = KW-HRS (ENERGY) ÷ NO. OF OPERATING HOURS IF THE LOCAL PUBLIC ELECTRIC COMPANY CANNOT SUPPLY A CERTAIN PLANT DURING PEAK HOURS -- THE SOLUTION IS TO USE A SECONDARY PRIME POWER FROM THE ENDUSER TO MEET DEMAND LOAD. IF THE ARRANGEMENT IS 12 HRS. FOR NORMAL POWER AND 12 HRS. FOR GENSET -- THE LOAD FACTOR IS THE SAME IF THE AVERAGE LOAD IS CLEARLY DEFINED.
What do you mean by load rejection?
In real world load rejection is when there is a
-Fault on the transmission line which causes circuit breaker to trip and as a result of this tip faulty line has been dropped.This event would be seen by the system, connected to other end of line, as load loss and event is called load rejection.
in layman terms
A load rejection is term used when load has rejected the supply or to remember easily
it's when load (receiving end) decided not to talk fully to supply (sending end).
Take a very basic example suppose you are running a motor which is drawing current
now for one or another reason there is fault in the line feeding current to motor and this line gets disconnected. Now sending end is still sending the current but receiving end (motor) can't receive it, this is called load rejection.
How designing stabilizing resistor in restricted earth fault relay?
To determine the value of Stabilizing resistor Rs = Vs/Is = If(Rct +2Rl)/Is Where, Rs = resistance value of the stabilizing resistor Vs = voltage at which the relay will operate Is = current flowing through the stabilizing resitor and the relay If = maximum secondary fault current magnitude Rct = internal resistance of the current transformer Rl = resistance of attached wire leads
Ronald Martin Foster was a mathematician who worked for Bell Labs. He was born in October 1896 and died in February 1998.
How do you design a three phase to single phase transformer 415v input 220v output 15kva?
might be interested in having a look at this:
Single-phase power through three-phase self-excited induction generator utilizing renewable energy resources
by Goel, SK (Goel, Sandeep Kumar); Srivastava, A (Srivastava, Ajay)
search for it online
Regards,
Bill
As power is defined as the rate of energy transfer, 'power dissipation' is a measure of the rate at which energy is dissipated, or lost, from an electrical system. When an electric current does work on a conductor, the internal energy of that conductor increases, causing its temperature to rise above the ambient (surrounding) temperature. This causes energy to dissipate away from the conductor into the surroundings, through the process of heat transfer. The rate of this heat transfer (joules per second) is termed 'power dissipation' (in watts).
This is power that is converted to heat and then conducted or radiated away from the device. Electronic and electric devices can have a limit on the current they can safely handle that is not an electronic limit, but a physical one. For instance, a transistor may otherwise be able to handle a certain amount of current, but it is given a lower current rating because the die gets too hot.
Dissipation is usually measured in watts, and uses the usual Ohm's law calculations for power:
P = I^2 * R
or
P = E * I
Electrical wiring in your house dissipates power, so does the speaker in your stereo, as well as motors, integrated circuits, anything that carries electrical current and has some inherent resistance (which is everything pretty much, except maybe superconductors!).
Power dissipation is usually an unwanted effect, unless you are trying to build an electric heater!
It is wasted power to keep the device quiescent and operational.
initial velocity on x
x=vi*cos(angle) 53.62 kmh 14.89 ms
well really alot of ways. for instance if you flash a light three times, it would be considered sos. anything in three that is used for help is usually sos. one time this girl got put into the trunk of a car. and she knew how to use her pocket knife to cut the tale light wires in the car. and she put the wires together three times, making the light blink three times and she was saved by a cop cause of the lights. so you could whistle three times, flash a light three times, alot of stuff
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What actions would you take if you find a circuit breaker is stuck?
Replace it immediatly, the breaker is no longer within code.
Zero out impedance and infinite internal resistance.
- Divya Naveenan
There are 360 deg in a circle. divide by 3 and you get 120 degrees per phase.
Show you colors for 2.2 kiloohms resistor?
Three red color bands indicate a resistor value of 2,200 ohms (2.2 kohms)
How do you convert 220V 60 Hz to 220V 50 Hz?
well first off, the electronics in the tv rely on the 50 hz signal to get the clock going right to show the picture, so you'll have to get some sort of power converter, then the tv will only accept PAL signals. So as far as watching broadcasts, it wont recognize NTSC which is used in the US. so if you have a PAL DVD player or something you can watch that, but anything you plug into the TV must be PAL.
the answer is .017 kilohms. To get this answer you will do a unit converions knowing that 1 kilohms is equal to 1 ohm.
So...
17 ohm * (1 kohm/1000 ohm) = .017
I realize that's a typo, but that conversion should read 1 kilohm is equal to 1000 ohms.
