Electrical Engineering

FEEDBACK CIRCUITS.

In addition to parallel and series circuits, there are also closed and short circuits.

To answer the question the voltage of the motor is needed as the wires size is calculated from the FLA of the motor.

power p= 1.73*v*I*cos(phy)

(1)find = I ?

(2)assume resistivity of cu, lengh of wire

(3)assume voltage regulation % is (10%)

(4)V.R.(10%)=(vs-vr)/vr

(5)find vs from above

(6)find voltage drop=vs-vr

(7)vol.drop =IR=(----from above-----(kw))

(8)find resi from abv

(9)resi R= (rho*length)/c/s area

(10)find AREA.....................ANS

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No. A unijunction transistor (UJT) is entirely different in design and application than a bipolar junction transistor (BJT). The UJT works on the principle of voltage modulation of the effective substrate resistance, while the BJT works on the principle of current amplification from one junction to the other, usually base-emitter to collector-emitter.

yes

Excitation tables helps to know the input conditions of the flip flops that will cause the required transition from the present state to the next state.

it means phrasing the load ha ha ha

The DC motor acts as a generator. The electricity generated can be used to power the overhead (or third rail) line and used by other trains going up a hill, thus acting as a brake slowing the train going downhill.

25 horse power.

Phase noise is a measure of randomness in a data set or frequency. It is often seen as short, random and rapid fluctuations which happen within a waveform.

Bcoz, corona effect is only possible in high voltage AC supply due to the frequency.

That is, the frequency and the HT voltage causes the arc b/w 2 conductors.so , here the air is act as the arc transmitting medium.we called it as Corona.

It is highly impossible in DC bcoz of no frequency.

You can but it is a waste of money. Across the line voltages for small HP motors is low. 5HP motor, 200 V = 17.5 amps, 230 V = 15.2 amps, 460 V = 7.6 amps and 575 V = 6.1 amps. Multiply these amperages by 300% for starting inrush and you see that the current is still not high enough to draw down the line voltage and effect other consumers on the same line.

An operational amplifier can sum an arbitrary number of signals and produce a single output signal.

PS is a special class of protection transformer used in differential protection schemes. The CT is specified by what is known as the knee point (that is the point at which the CT saturates).

Because they are specified using the knee point, two separate CTs will have the same characteristics. These matched CTs won't introduce measurement error during through faults on differential protection schemes.

Novinium, Inc. is a global leader in cable life extension technology for the utility market.

Assuming your battery supplies a constant and exact voltage of 12VDC, then your 15 watt load will draw 15 W / 12 V = 1.25 A. Your battery can provide 20Ah, so you'll drain it in 20Ah/1.25A = 16h. Note these are only theoretical values; a real battery doesn't behave like that. The voltage is likely to be higher than 12VDC on a fully charged battery (more like 13..14VDC in a typical car battery, for example), and the voltage will drop over the discharge. Just how the voltage drops (how fast, how low) is a function of the battery (design, quality, age) and environment (temperature, possibly altitude).

Frequency is a function of engine speed and the number of poles in the generator end. For instance, a speed of 1500 RPM turning a four-pole generator will produce 50 hz. The formula is: Frequency = (poles/2) * (RPM/60) From the formula, you can see that the same frequency would be produced by a two-pole generator spinning at 3000 RPM.

transformative constitutionalism can be said to be a method of bringing an issue in line with the provision of the constitution. it can mean to address a legal issue in a way that it conforms or come in line with the provisions of the constitution.

Secondary voltage / primary voltage

Alternating current is a flow of electrical energy in which the direction of electron flow reverses periodically. The mains electricity in your house is likely Alternating Current. The other form is Direct Current, where the direction of electron flow is in one direction only. Such as the flow from the batteries in your flashlight.

The turntable in a microwave oven is driven by an alternating current motor which may start in either direction at random and continues to travel in that direction until stopping. The reason for using a turntable in a microwave oven is that the microwave energy is not evenly distributed across the oven. The turntable allows the food to receive an equal amount of energy by turning across the uneven microwave field. The microwave energy is turned to heat within the food. It actually does not matter in which direction the turntable rotates in order to evenly cook the food.

Even the heaviest steel cables stretch under load, whether they heat or not. Heating the cable will certainly elongate it. Friction -- caused by guides or pulleys -- can greatly increase the temperature of a cable under load. Well yeah! And, you might consider the possibility of total failure if the heat is high enough and I am not sure but the cable might act in unpredicable ways when it fails. Applying heat to a steel cable under load is probably dangerous to your health and the health of anyone nearby. Perhaps my previous answer was a little cavalier. When steel is heated steel expands. It does not need to be under load. That is the reason that in the old days before advanced electronics and optics surveyors used chains rather than cables for measuring land. Had they used cable they would have gotten different measurements in summer and winter based on the difference in temperature and the coefficient of expansionof the material.The coefficient of expansion is a number that informs just how much a given material will expand or contract for a given change in temperature. To find the coefficient of expansion and other interesting information consult a materials handbook, available in better libraries or your local college of engineering. Another example of expanding steel and the necessity for dealing with this characteristic is the overlapping slip joint found on bridges that allows horizontal structural members to expand and contract without damaging the bridge.

if the speedometer works off of an input wave (sinusoidal signal) you would think the signal generator would be a source of reference