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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
When a strobe light is tuned to exactly half times RPM how many reference marks will appear?
Assuming there is one reference mark on the rotating object to start with, a strobe tuned to exactly one half times RPM will show only one reference mark, i.e. one every other revolution.
What will happen to the efficiency of a transformer if the iron core is removed?
its efficiency will decresed.
What size of cable is needed for 1000 amps?
A parallel run of 750 MCM AWG conductors will handle 1000 amps.
if we want 1000amps to flow, 250sqmm cable is enough.
What is ac current and DC current?
AC: Alternating Current
The current oscillates cyclically between a maximum and an minimum.
DC: Direct Current
This is fixed. The current is always at a constant value.
What type of oil is used for a 1999 mercury mountaineer?
Use Ford part no. XO-5W20-QSP or equivalent motor oil meeting Ford specification WSS-M2C153-H.
Conventional or Synthetic your choice. I recommend Synthetic if the engine is sound and has no major oil leaks.
Hope This Helps.
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According to the ( 1999 ) Mercury Mountaineer Owner Guide :
With engine oil filter change :
The 4.0 liter V6 and the 5.0 liter V8 engines take :
4.7 liters / 5.0 U.S. quarts of ( 5W-30 )
( Helpfull )
Examples of circuit diagram of transfer function?
An battery to light and back or Wires to TV and back.
How much power of Gas Generator required to run 350 HP Motor Star Delta?
There is 746 watts per HP. So a 350 hp motor with a power factor of roughly 0.8 would require 261,000 W 261KW generator or 326 KVA.
What are self-commutated voltage source inverters?
A self commutated is one which the means of communication is included with in the inverter itself.This is the case for circuits including electronic poer switches with turn off capability.
What will be the effect if the d.c motor is directly connected across the supply without starter?
At zero rpm a dc motor draws a current that could be enough to blow the circuit breaker. In that case it is normal to place a resistor in series to limit the current to slightly below the circuit-breaker setting. The resistor is switched out after the motor runs up.
What is the meaning of rated power frequency withstand voltage?
The r.m.s of sinusoidal power frequency voltage that the equipment can withstand during tests under specified conditions and for a specified time
What is T1.25AL fuse means in terms of voltage and current rating?
Most `T' fuses are rated in either 125 volt or 250 volts A.C. If you look at the metal end cap on one of the ends, it'll specify which voltage it's rated. The 1.25, is 1.25 amps at the rated voltage.
The coils have constant voltage to them, each a branch of 1 or 2 coil power wires. the coil "fires" by alternately grounding and ungrounding the negative terminal of the coil. with the key in the "on" position (engine off) there should be constant power (battery voltage) to the positive terminals of the plugs of every coil. If you attach a test light to the positive coil terminal and probe the negative coil terminal on any of the coil plugs, then crank the motor, you should see the testlight flash. If the light stays on there is a short on the coil ground(bad wiring or the computer is keeping it on). If the light doesn't go on at all, the coil ground is open (broken wire or a driver in the computer burnt). If the light does flash and there is power on the positive side, the coil itself is probably bad.
Are limit college is affilate with bzu multan?
are limit college sahiwal is affiliated with bzu multan
Check the earth fault trip off set limit of the ACB. It may be too low.
Which will normally have the larger resistance a voltmeter or an ammeter?
A voltmeter has the large resistance.The voltage across any component can be measured if & only if the terminals of that component will be open and this will we can acheiv if we connect the high resistance voltmeter across the open terminals of that component to measure the voltage.
Who invented the stepper motor?
In 1920,English engineer Walker invented the frist stepper motor which was a switched reluctance stepper motor.
What is the working principle of geophone?
Geophone Are Moving Coil Electromagnetic type principle is contained
Why do conduct the pressure test in power transformers?
to check the leak in th transformer
AnswerThe term, 'pressure test', has nothing to do with 'pressure'. It is a test in which the integrity of the insulation of an electrical component is tested by applying an over-voltage across it for a specified length of time. Pressure tests are conducted prior to commissioning high-voltage equipment.
The applied voltage is a DC voltage, and its magnitude, and the duration of the test, depends upon the voltage rating of the component being tested. It is often necessary to perform more than one test, depending on the configuration of the component being tested -e.g. line-to-line, line-to-earth, etc. The test is not intended to break down healthy insulation.
In the case of a transformer, a pressure test is conducted to ensure the integrity of the inter-winding insulation, and between the windings and earth. Transformer oil is also subject to independent pressure testing, but this is normally conducted in a workshop or laboratory,
What does Earth ground isolating class 2 transformer mean?
A Class II transformer is limited to not more than 60 watts. It is a low energy device and is considered "inherently limited and intrinsically safe" an integral fuse isolates primary and secondary circuits. Secondary wiring from a Class II transformer does not require conduit and clamp wiring techniques in accordance with Section 3 of the NEC. The HR-88 button lights and miniature recessed cabinet lights require this transformer.
direcly puting a load with out any control over the load once applied difficult to take out
I would imagine that reversing the leads would rectify that. (No pun intended.)
A: Since you know the current flow you need the voltage drop for this particular led at 20ma. All LED require a current and voltage to operate properly assuming a voltage drop of 2v then for a 12v source it becomes 12-2=10v 10v/.02=500 ohms in series to limit the current is required
