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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
How do you sing home sweet home?
Mid pleasures and palaces though we may roam,
Be it ever so humble there's no place like home!
A charm from the skies seems to hallow us there,
Which, seek through the world, is ne'er met with elsewhere!
Home! Home! Home, sweet home!
There's no place like home, there's no place like home!
An exile from home splendor dazzles in vain
Oh, give me my low, thatched cottage again,
The birds singing gaily that come at my call,
Give me them with that peace of mind, dearer than all.
Home! Home! Home, sweet home!
There's no place like home, there's no place like home!
if this is the one in your car the rotor has slip rings where you can put 12v dc
which will give over 100v with no load
old cars have external regulator 3-4 wires
new ones have one wire all circuits in one little lump of epoxy
the stator is 3 phase
delta or Y - 6 or 3 diodes
the rotor a 12 v DC magnet with slip rings
the diodes sometimes fail
the brushes are only good for about 10 years
usually to trouble shoot just start the car and see if the battery voltage increases.
Is the load of elevator motor depend on building height?
no,elevetor motor depends on size of elevetor & how many persons are accomodate in elevetor.
Why are use thin wire in phase of transformer?
I think you mean 'winding', rather than 'phase'? The cross-sectional area of the conductor must be such that it can carry whatever current the winding is designed to carry -if the current is low, then the cross-sectional area (and, hence, its thickness) can be low.
DC Motorcars is owned by Tony Tong, and will be passed on to his son Ivan Tong, after he turns 23.
What is house load of power plant run parallel with grid and how to calculate it?
House Load of a Power Plant is also known as Auxiliary Power Consumption or Units Used on Works.
It is the electrical power needed to drive the pumps and fans that support the operation of the power plant.
Typically the power plant metering is set up to measure the electricity produced by the generator at the terminals. A seperate meter will measure the electricity used by the auxiliaries, at the unit transformer.
Auxiliary Power Consumption is often expressed as a percentage of Units Generated, so:
Aux Power = ( Units Used on Works / Units Generated ) x 100 %
% MWh MWh
Typical Auxiliary Power Consumption depends on the type of plant:
Plant Type
%
Coal-fired Thermal
6.5 - 8.0
Open Cycle Gas Turbine
2.5 - 3.5
Combined Cycle Gas Turbine
1.0 - 1.5
How can you hook a 230v 3 phase lathe to 480v 3 phase incoming power?
Inspect all motor labels and see if they are dual voltage motors. If they are, they should have a label on them telling you how to convert the motors for 480 volt. This is a relative simple task. Converting to 480 volts will lower the motor current to half of the 230 volt rating, so you will have to change the overload heaters in the individual motor starters. You need to do this to protect the motors in case of overloading. Last the control transformer will need to be reconnected for 480 volt.
What is the relationship between output voltage and duty cycle in a step down chopper?
If you have a cigar lighter to USB power converter used in your automobile to charge from a USB bus that fits in your car cigar lighter, the USB voltage is 5V. The car is 12V.
So there is a switch to turn it on for 5 ticks and off for 7 ticks
42% duty cycle
if you wanted 1.2V 10% duty cycle
How do you conduct leak test to a power transformer?
1. Test Method
1) Breather separated from main body, body clean by Air.
2) Nitrogen(Dry air) through the transformer to the body's respiratory system piping at a pressure of 0.35kg/㎠ injection.
3) Pressurized leakage area and then left in place for 12 hours after the inspection.
4) Record the start of the test, the injection pressure and oil temperature(ambient temperature) will vary depending on the oil temperature and the pressure of nitrogen(N2).
5) If the leakage area in case of a fastening portion and gasket area and re-check the pressure(leaks) to restart the test. (In this case, the pressure holding time is restarted.)
How many meters of wire make one ohm?
The resistance (ohms) of a conductor depends on a number of factors including the type of material, its thickness and the temperature.
There are charts that will tell you the resistance of different sizes of wires and the correction factor to use for non-standard temperatures.
Which activities would you perform during project execution?
Documenting information about employee performance, which will be used to update the plan for managing human resources
Recommending that the plan be changed so that an extra team can be hired to work at night, when work falls behind schedule
Supervising the construction schedule
Will multiple tripping of a circuit breaker damage the circuit breaker?
You don't specify whether you mean low-voltage circuit breakers, such as MCBs (miniature circuit breakers) or high-voltage circuit breakers. In either case, repeated tripping under fault conditions causes arcing which damages the main contacts of the circuit breakers. For this reason, high-voltage circuit breakers are taken out of service after a specified number of tripping operations, so that the contacts can be maintained or, if necessary, replaced. MCB contacts are inaccessible, and the MCB may eventually require replacing.
What is the path of least resistance?
We will take an analogy here. Like you(electron) are very exhausted and want to return home(your positively charged beautiful wife) as quickly as possible. Now you start your car and find that there is a huge jam(resistance) on highway(a path). Now if there is an alternate road with lesser traffic you will surely analyse the number of cars(positive ions), length of road(length of conductor), width of road(area of conductor) and thenyou will take best possible way. Similarly the electrons take the path which is small in length, big in area and least positive ions so that collisions are less. In other words they take the path of least resistance.
What is special about electric current in a series circuit?
In a series circuit the current remains the same throughout the circuit. This is not the case for parallel circuits.
How do you wire a hobart p660 3 phase mixer?
The information from the equipments nameplate is needed to answer this question in a complete way.
What device may be wired into the starting circuit of a motor to improve the starting torque?
I assume a 3 phase, AC induction motor.
A star delta starter or a soft starter can be used. A soft starter is better compared to a star delta starter, but it is more expensive.
How much will it Cost to upgrade an electricity supply from phase 1 to phase 2 for a Melbourne home?
If you are asking whether it is possible to upgrade from single phase to two phase, then you should understand that a two phase system is archaic and will not be available from your electricity supply company. If you are asking whether your company can supply two lines (out of three) it's quite unlikely -they will normally supply single phase or three phase! You can likely upgrade to three-phase if you have a reason to do so -e.g. to operate three-phase motors. As for the cost -you'll have to check that our yourself!
Which AC input transformer required for 5volt dc output power supply?
It depends on the required output current, load rejection factor, and ripple. Also, efficiency enters into the picture.
Can a dc motor generates ac current?
if you have something that rotates 360 degrees, it ends up back where it started. the geometry produces a sine wave. DC generators have a design that switches during rotation, or otherwise they generate AC then convert it.
Why should you use a proper fuse with proper specifications?
If you use a fuse that's too slow, or too highly rated, the excess current passing through the circuit may damage both equipment and wiring.
If you use a fuse that's too fast, or with too low rating, it may blow prematurely preventing the equipment from working properly.
What is an inductor and its current rating?
An inductor is an electrical component, usually a coil, designed to offer a specific value of inductance (measured in henrys). As the operating current of an inductor affects its inductance its inductance value (inductors are not linear devices, due to their hysteresis characteristics) is normally expressed for a specific range of operating currents.
Why speed regulation does not apply in dc series motor?
A series motor can run away and reach a high speed on no-load, which happens because it accelerates until the back emf generated in the rotor is nearly equal to the supply voltage. On no-load the current and therefore the field are both small, so the motor speed has to rise to equalise the generated voltage.
