Electrical Engineering

A COLT Tester is a Common Organizational Level Tester developed by Lockheed martin to test various systems, including the weapons system on the F-22 aircraft.

A shunt DC motor connects the armature and field windings in parallel or shunt with a common D.C. power source. This type of motor has good speed regulation even as the load varies, but does not have the starting torque of a series DC motor

You describe a series circuit. This answer is for a series circuit. The total impedance is 16 Ohms, 12 + 4. The current by Ohm's Law (Amps = Volts / Ohms) is 40 / 16, or 2.5 Amps. Kirchoff's Current Law says that the current at every point in a series circuit is the same, so the current flowing into the 1st device, the 12 Ohm resistor, is 2.5 Amps.

The properties that are desirable in a computer will depend on what you need it for. If you want it to play games, you will want a good video and audio card.

30cc is equilent to 20 mph

The DC motor speed control has a scope of four speeds. The control speeds include; high, medium, low, and off.

KV DRDO is located in C.V.Raman Nagar, Bangalore

K means thousands. 2K7 is another way of saying 2.7K and means two thousand seven hundred, or 2,700 ohms This method of component value indication is used because it is too easy to miss the decimal place, especially on small components or small font size in a schematic. Technicians may accidentally read 27K instead of 2.7K.

D.C. stands for direct current. A.C. is alternating current.

Yes, the induction motor has a rotor winding. It is usually one turn, shorted. This is how the magnetic fields generated in the stator induce a current in the rotor, which subsequently generates a torque from the opposing magnetic fields, stator to rotor.

By using a voltage divider, that is two resistors of the same value in series across the DC supply. Half of the supply voltage will be at the point where the two resistors is connected. But how much wattage of those resistors is also an issue.

BIL

Haw to calculate the parameters of distance protection for REL 670

what does it mean by rotating amplifier and how it works?

See voltage means potential difference. Electrons move from higher potential to lower potential always. In wire same thing happens. So electrons flow because there is potential difference and flow of electrons causes current to flow. current is nothing but flow of electrons. reply if u r satisfied @ rahul.khaladkar@rediffmail.com

φύσις With the motion of e+Pi x ^ . Inside this is gold allumionium and copper sulfate.

Hii

creep is a phenomenon that can adversely affect accuracy, that occurs when the meter disc rotates continuously with potential applied and the load terminals open circuited. A test for error due to creep is called a creep test.

forcing a constant current and measuring the voltage across the unknown resistor.

A simple circuit consists of a source of electro motive force ( EMF or voltage V )

This could be a battery,dynamo or solar cell. The circuit should do something, like light a lamp. For the lamp to glow there must be a flow of electrons called an electric current measure in Amperes (I). For the current to flow the circuit must form a closed loop, like a daisy chain. A switch is a device that breaks this loop and controls the state of the circuit.

Closed circuit, switch closed, = lamp on

Open circuit, switch not closed = lamp off

Yes, there is a difference between single phase and three phase circuits.

Overvoltage on DC motor armature can be detrimental to the life of the windings. Most modern drives have voltage feedback and detect this condition.

A likely cause is loss of speed feedback, voltage feedback or the load driving the motor beyond what the drive can handle.

Fixes for the above: -check and mend the feedback circuits and associated hardware (cable, tachos, input cards, processor cards)

-change from a single quadrant to a four quadrant drive

-install a braking resistor

-inspect the mechanical system to ensure there are no wild split points in the gearing

Crawling is caused by harmonics effects on the motors rotating magnetic field. If harmonic levels are high enough they can become the dominating factor in the rotating magnetic field causing the motor to run at a much lower speed than designed.

http://www2.sea.siemens.com/NR/rdonlyres/4058E086-2AFD-4C47-B9B1-0FCF4428FA39/0/MAGNETICNOISEININDUCTIONMOTORS.pdf

The hum is generated by the magnetic field continually reversing at the frequency of the supply. 50Hz in Europe and 60Hz in the USA. This frequency is set by the speed of the turbines spinning magnets past wire coils of the alternators in the power stations.

The magnetic field in the AC machine or transformers have coils which,although secured by being dipped in varnish, are still able to move slightly.The armature laminations are treated in a similar way but also vibrate at the line frequency and it is almost impossible to stop.You can only reduce it to a minimum by good design.

tel me the connections of 6wire stepper motor with 8051 microcontroller