Electrical Engineering

NAICS 335912 applies to Dry and Wet Primary Battery Manufacturing.

what is the correct fuse rating to provide short-circit protection for a100 HP 200V 3-0 wound-rotor motor

No. Alternating Current and Direct Current are the only two types of current.

You can check your degree certificate to see if it is original or not by looking for a raised seal on the certificate. Usually an original will have such a raised seal, a copy will not.

Actually, a data cable tray is a low voltage cable tray also. Data systems are accepted as low voltage systems. Ordinary two data cables do not form any magnetic disturbance to each other. So for an ordinary situation no vertical or horizantal distance required.

It is used when u need to step up or step down a particular voltage level.

A fully charged cell in a car battery produces 2.2 volts, there are 6 cells in a battery. That would make true open circuit voltage on a fully charged battery at 13.2 volts. So a 12 volt open circuit reading is a discharged battery.

The battery can have enough chemical reaction to produce voltage but not enough potential or power to crank the engine. Think about a fresh 9 volt battery. It is big enough to produce 9 volts, but not enough to crank a car or even light the dome light dimly. A car battery wears out slowly from the time it is purchased. Eventually it doesn't have enough power or amperage left to operate the car.

Ohms law states that

V = I * R

I = V/R

R = V/I

P = I*V

Where V = Voltage, I=Current, R = Resistance and P = Power or Watt Watt is the amount of electricity flowing through a line which is (Voltage times Current in (Amperage) = Power or watts) To find the power dissipated by a resistor of 1000 ohms, we first find the current I. The voltage is given as 200volts. Therefore I = V/R = 200/1000 = 0.2Amps We said Power or Watt = I*V Therefore the Power or watts dissipated by a resistor of 1000 ohms will be P=I*V = 200*0.2 = 40 Watts

Because it reaches the end of the line every half cycle! Electricity flows at approximately the speed of light.

This is incorrect. Electrons in the wire actually move at a very slow speed (about 0.0001 m/s, or 0.00022 mph), and this speed is called the drift velocity of the electrons. However, this is neither here nor there in regards to the question. Current is defined as the rate of flow of charge, or I = q / t, where I is the current, q is the net charge, and t is the net time. Each electron has a small charge, and in an AC current the each electron oscillates back and forth about a single point in the wire. Our definition of current as been fulfilled: we have charge flowing. It makes no difference that the electrons are simply moving back and forth; they are still moving. It's an interesting thing to note that the power company doesn't actually provide you with charge; all they do is the work required to move the charges already in your wires back and forth.

Linemen work on live wires by using proper insulation gear, and by making sure that there is never any path for current to flow in case the insulation does fail. In some cases, the lineman can be raised to the potential of the line, but you still need the insulation, and you still need the technique of ensuring that no circuit can be accidentally created.

Consider the instantaneous DC analysis. Initially, the capacitor has zero resistance. You apply a voltage and current is controlled by other resistive elements alone. As the capacitor charges, its effective resistance rises. This adds to the net resistance in the circuit, reducing current. At full charge, the capacitor has infinite resistance, so there is no current. Remember that the equation for a capacitor is dv/dt = i/c.

If your test meter is an analog type of meter there should be a zeroing screw on the meter face that is connected to the needle movement. Turn this screw to zero the meter. If the meter is a digital there should be a potentiometer, probably in the battery compartment that can be used to zero the display.

Data is transmitted in carrier schemes by injecting a signal into C2 capacitor of a CCVT or CCCC. Under normal conditions, C2 is left floating and is in series with C1, which is connected to HV line.

There are various transmitters and recievers that can be used. Another scheme I have seen involves injecting on a PT, and reading data back on a CT. This scheme attempts to place the signal at the zero crossing points so it is more easily read (less noise interference). In some places, this does not work well due to large arc furnaces (steel melting mills, for example), which tend to throw a lot of harmonics onto the power system, which distrupts the ability to accurately determine zero crossings in real time (some filtering techniques can help).

The clap switch works with the use of an impulse response of a transfer function. It makes use of a sound analyzer input and interface with a digital signal processor and FFTs.

V X A = W .....from.. (P=IV)

W = power

V x A = apparent power

On a standby generator 100 percent of the power drops before the generator will start.

If your three phase motor runs backward, you have two phases swapped. double check a, b and c phase to find which ones are misplaced.

Because everything always has to be grounded, for safety. If a 'ground' is not available, as in an aircraft, all the external containers for the different items of equipment are all connected together to the local 'earth'.

tutorial(6 mark)

Yes diode is useful after break down because it flows current from one direction to other direction

HRC stands for 'high rupture capacity'. An alternative abbreviation is 'HBC, meaning 'high breaking capacity. The rupture (or breaking) capacity is a term describing the maximum short-circuit current that the fuse can safely interrupt at its rated voltage. Most fuses will safely interrupt any level of fault current between a current that just causes the fuse to operate (melt), up to their maximum breaking capacity- such fuses are called 'full-range'. HRC fuses usually have strong, ceramic bodies to withstand the huge pressure generated when the fuse has to interrupt a large short-circuit current. In contrast, low breaking capacity fuses have weaker bodies made from materials such as glass.

there are many such as:

Wind energy

Solar energy

coal

oil

Natural Gas

Hydroelectric Power

Nuclear Power

Geothermal

I could go on, but it will be a VERY long list.

According to my repair programs at my shop there is no actual connector for the est.To set the timing you need to short'a' and 'b' of the dianostic connector.I use a paper clip bent in a 'u' shape.Tool manufacturers do make a key to plug in but it does the same thing.With the engine running you can set the timing.With the engine off and the key on this will blink the check engine light for any stored codes in you computer system. whitegorilla@yahoo.com

If the wire used is aluminum, just a small movement of this wire can cause a brake. Aluminum wire ran under a drive is an area I have seen a problum. If ran under a drive than it should be in concuit. With copper or aluminum the wire may have been nicked when it was installed. This would caues corrosion and a brake after some time.