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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
Total instantaneous power supplied by a 3-phase ac supply to a balanced R-L load is?
sinusoidal with non-zero average.
Use Ohm's Law and explain how 2 circuits have the same current but different resistance?
As we know V=IR, by changing the voltages in the two different circuits, we can maintain the same current even we have different resistance.
What is Short circuit maintenance current transformer in automatic voltage regulator?
the SCT is used to provide excitation during short circuit conditions. under Short Circuit the voltage may drop below threshold level causing field current to drop, to avoid over excitation by the AVR, the short circuit provides the excitation energy required to maintain a voltage that allows protective devices to operate and isolate the fault.
the SCT is open under normal operating condition
Why are parallel circuits considered current dividers?
They divide the electrons between different branches of the circuit.
It is called a plasma discharge. It happens when a high voltage, pole top, air switch is opened under load and the current does not immediately stop but conducts through the air as the switch pole faces become further apart. Eventually the resistance of the air-gap overcomes the current flow and the plasma discharge extinguishes itself. These flash overs are hard on the contact points on the switch so long rods (called horns) are placed on the switch contacts so that as the contacts separate, the plasma discharge is drawn away from the contact and up the rods (horns) until the flash over stops. These types of switches are called horn gap switches.
What happens when high input signal is given to pnp transistor?
A high signal input to a transistor amplifier gives a high signal output provided it stays linear.
What are the advantages of a HBC fuse over a cartridge fuse?
HBC (High Breaking Capacity, European term) and HRC (High Rupturing Capacity, North American term) fuses have the ability to break high fault currents. This is done by having silica sand in the fuse that the fuse elements travel through. On high fault current that sand will melt and turn to glass. This breaks the current flow immediately
A cartridge fuse maximum current breaking capacity is very much lower than HRC, HBC because there is nothing in the fuse body except the fuse elements.
Is it true or false that generators create electrical energy from nothing?
false; you cannot get energy from nothing, it is conserved
What is characteristic equation in control systems?
Set 0=(denominator of the System Transfer Function), this is the Characteristic Equation of that system. This equation is used to determine the stability of a system and to determine how a controller should be designed to stabilize a system.
What voltage of an ac circuit has a peak voltage of 396 volts?
Approx. 280 VRMS. Vpeak * 0.707 = Vrms
It depends on how the home purchase will impact your creditors. If you you payment will be doing up, then you will have less money paid to your creditors under the Chapter 13 plan. On the other hand, you might get approval if the purchase won't lower the amount of money creditors would receive under the plan.
Motor wise what is the difference between a f150 lightning and a harley Davidson edition f150?
hd f150 has 380 hp, while the lightning has 500 hp. different intakes and exhaust.i may be slightly off on hp figures, but there is a significant difference. Added by Frontline62 6/11/08 The 1999 & 2000 Lightning Have 360HP. The 2001-2004 Lightning have 380HP. The SC HD has 340hp. Ford didn't Supercharge the HD every year it was produced. So some of the HD have less than 340hp. There is no difference in the motor though. They both have a 5.4L V8.
How do calculate secondary current of step down transformer?
The secondary current is determined by the load. So, divide the secondary voltage by the load impedance.
ACDB stands for alternating current distribution board. A distribution board or panel is part of an electricity supply system. The panel splits the power up into circuits. At the same time, it uses fuses or circuit breakers to provide protection from electrical overload.
Does the highest or lowest resistance dominate a parallel circuit?
The total effecive resistance of several individual resistances in parallel is less than
the smallest individual resistance, so in that sense I guess you'd have to say that
the lowest resistance 'dominates' the character of the whole parallel circuit.
What is the working principle of ac motor?
AC commutator motors, like comparable DC motors, have higher starting torque and higher speed than AC induction motors. The series motor operates well above the synchronous speed of a conventional AC motor. AC commutator motors may be either single-phase or poly-phase. The single-phase AC version suffers a double line frequency torque pulsation, not present in poly-phase motor. Since a commutator motor can operate at much higher speed than an induction motor, it can output more power than a similar size induction motor. However commutator motors are not as maintenance free as induction motors, due to brush and commutator wear.
Yes they do have a resistance. Even though a battery is a voltage source it has some thevenin resistance. Every lead plate and cell of sulfuric acid, will have a small resistance. The thevenin resistance is equivalent or sum of all those resistances.
The final current is E/R = 0.262 = 3/R.
R = 3/0.262 ( = 11.45 ohms ).
The time constant is RL = 0.532.
L = 0.532 / R = (0.532) / (3/0.262) = (0.532) (0.262) / 3
= 46.46 millihenrys (rounded)
The cable size is : 4*25 mm2
What is the function of gimlet?
A gimlet is a small pointed tools for marking or making holes in soft material like leather.
Can a furnace operate on a power factor of 0.2?
If a furnace has a power factor not equal to 1 then there is a motor involved. If it was pure resistive element the Power Factor would be 1. That being said the motor can operate at .2 PF, but this is unusual and not very efficient. If this is the case I would expect that you have a bad motor control circuit and there may be a blown capacitor.
