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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
Sketch and explain the no load phasor diagram of a transfomer?
a.) Io = no load current consists of 5% of the full-load primary current.
b.) Iom = magnetising current/component responsible for setting up the magnetising flux in the core.
c.) Iol = Ic = power loss component responsible for supplying the core losses and the windings losses.
What is the difference between an isolation transformer and distribution transformer?
in isolation transformer earthing is not provide on secondary side but in ordinary transformer neutral of secondary side is earthed
AnswerAn isolation transformer is a 1:1 ratio transformer; its function is to electrically isolate the secondary side from the primary side without changing the voltage. An example of an isolation transformer is the one used in a shaver socket.
A distribution transformer is a step-down transformer, used within the electricity network's distribution system. An example of distribution transformer is a pole-mounted transformer, supplying low voltage to residences.
(Of course, all mutual transformers provide electrical isolation between primary and secondary.)
What is the voltage in which ESD can affect components?
Most components are designed and built to work at very low voltage. ESD can be of a magnitude of 1000 times greater. So if this voltage can find its way into a circuit it can permanently damage the circuit or worst yet weaken it for a premature failure
A capacitor, in its simplest form, is two conductive plates separated by a dielectric.
A home generator puts out enough power to run how many applincesat a time?
Not all generators have the same output. Check the manual that came with your generator.
Class PX is the definition in IEC 60044-1 for the quasi-transient CT formerly covered by Class X of BS-3938, commonly used with unit protection schemes. These are Protection CTs used for Earth fault protection. Knee point voltage is an important parameter for these type of CTs. Shaikh
The short answer is that they don't.
But that doesn't help you much.
Electrons flow from the negative terminal to the positive terminal.
Why?
Negative and positive (opposite) charges attract each other, and like charges repel each other. So you can think of the positive charged end pulling electrons towards it, as well as the negative charged end pushing electrons away from it.
Water makes a good analogy, the battery is a pump, so there is high pressure on the outlet of the pump ( the negative terminal ) through the pipes and whatnot, ( the wire and whatnot) to the inlet of the pump ( the positive charged end ).
Answer is GAIN
A auto transformer has what kind of induction?
self-induction.
"According to Lenz's law,[6]a changing electric current through a circuit that contains inductance, induces a proportional voltage, which opposes the change in current (self-inductance). The varying field in this circuit may also induce an e.m.f. in neighbouring circuits (mutual inductance)." - Wikipedia
Well as you said, it is self explanatory. The current density should not be more than 1000 A per square inch roughly coming to about 1.6 Ampere per square mm. Consider the case when the current density is high i.e. it could be high because of either reduced area with same current OR with more current through same area. Any of this case would lead to increase in the thermal lossess which could eventually lead to thermal runaway without the temperature rise getting stabilized (Stability being defined as temperature rise not exceeding 1 deg C per hour).
Rgds,
Fency Anthony, ABB Limited, India
In parallel circuit-what happens to the total resistance if one branch opens-Provide an example?
Increases
Why the 3 phase of high voltage conductor or cable transposed?
3 phase cable is transposed to minimize the effect of leakage/capacitance current.
What are the types of electrical charges?
there are basically 3 types of electrical charges VIZ,Electrons,Protons,Nutrons
AnswerThere are two types of electric charge: a negativecharge, and a positive charge.
Electrons are negatively charged, and protons are positively charged. Neutrons (not 'nutrons'!) do not carry any charge -they are 'neutral'!
What is the difference between DC and AC resistance?
AC resistance should NOT be confused with IMPEDANCE or REACTANCE.
When AC flows through a conductor, it tends to flow towards the surface of that conductor due to a phenomenon called the 'skin effect'. The skin effect, therefore, acts to reduce the effective cross-sectional area of the conductor. Since resistance is inversely-proportional to cross-sectional area, the result is an elevated value of resistance compared with that to DC current. This is called AC RESISTANCE, and it increases with frequency. At mains frequencies (50/60 Hz), AC resistance is not dramatically higher than DC resistance but the difference becomes significant at high frequencies.
Read more in the Related link shown below this answer.
What is an electrical conductor and an electrical semiconductor?
Conductors are substances that allow flow of electricity through them. Although some electricity is lost in the form of heat, yet is negligible.
Eg: silver gold copper iron
Semiconductors are elements that allow electricity partially. For example they allow 50 percent and stops the rest.
Eg: silicon germanium
Calculate the power produced by a motor operating at 950rpm if the torque developed is 37 Nm?
3681W. Power = 2*Pi*T*n where T = torque (Nm) and n=speed (revs/sec)
What is cl PS current transformer?
CL of a CT is its accuracy class.. it is an approximate measure of the CT's accuracy.
e.g. The ratio (primary to secondary current) error of a Class 1 (CL:1.0) CT is 1% at rated current
If a parallel circuit shorts at the battery will the entire circuit short out too?
If at battery,parallel circuit shorts then equivalent resistance of circuit becomes approximately 0 Ohms,and therefore as current follows low resistance path infinite amount of current due to low resistance will flow through the wire so,entire parallel circuit will short out,but wire will burn and battery may get damaged.
Name:Sumit Karnik.
ASIC is an Application Specific Integrated Circuit. In other words, an IC that was designed and nade just to do one specific job.
How does the variation of excitation of an alternator correct power factor?
The rotor of an alternator need a DC voltage applied to it to generate a magnetic field, this magnetic field will generate the AC power in the AC windings.The AVR(Automatic Voltage Regulator) is regulating this DC voltage so that the magnetic field is strong enough to maintain the output AC voltage. As soon as more current is drawn from the output, this output voltage will drop and a stronger magnetic field is needed to sustain the output voltage, so the AVR step up the exiting voltage to get a stronger magnetic field to compensate for the voltage loss in the AC windings.
Why instead of transmitting maximum power power utility transmits power at maximum efficiency?
This question relates to the economic decisions that electricity utilities make in designing their power networks. During peak load periods, power is transmitted at the maximum current that is safe for the network, but at other times power transmission simply depends on demand.
Ideally, utilities would transmit power at maximum efficiency because, by minimising losses over the lines and in transformers, they minimise generation costs. However, each increase in efficiency results in increased capital costs. A compromise is always made between purchasing efficient power transformers and distribution transformers or less expensive ones with higher losses.
A screw is a fastener that is similar to a nail, but it has threads.
What is the Stator output 2005 roadstar?
Hi As far as I have been able to figure out the 1600 puts out a whopping 21 amps, the 1700 puts out you ready for this? 20 amps. Not much anyway, so if you are looking to add a bunch of lighting like halogen rode lights better look for a higher out put stator and heavy duty regulator - rectifier, They are out there but nailing the seller down to actual output is hard. Hope this helps.
