Electrical Engineering

CD4017 is a CMOS decade counter. The only thing that can replace is another CD4017 because it uses a rather unusual high impedance high voltage (28 volts) technology. They are readilly available.

Bum fun

Torque is nothing but a Twisting Moment.

If you sample at more than the Nyquist frequency (one half the signal frequency) you introduce an aliasing distortion, seen as sub harmonics.

A load flow study must be done to rightly determine this. A simplified approach to begin would be to look at the power equation:

P = V1*V2*sin(phi) / (X1), where v1 and v2 are the voltages at the two nodes in question (the wind farm, and the remote location), phi is the phase angle between these voltages, and X1 is the reactance of the line between these two nodes. By raising the voltage at the wind farm, or by increasing phi, or by lower X1 by using better conductor / design, more power can be transmitted.

in the applications that need low motion..with high torqe..

like..printer & floppy disk motors (stepper)

its for something known as "time pass"

no good reason...just there

=)

To show that - since the resulting graph is a straight line - "V" is proportional to "I". In other words, if you double "V", then "I" will also double.

The cross-sectional area is one of the factors that determines how much current a conductor can carry -this is regardless of the shape of that conductor's cross section (many conductors are not circular). So the diameter is of not much interest.

How to take the sleeve out of a boom

It is a Photosystems Excitation Pressure and Development of Resistance to Photoinhibition. The investigation revolves solely around comparing resistance increase.

Reactance grounding is done to lower ground fault current amounts, often to protect generators. It's done by tying the neutral of a generator to a grounding reactor (the other side of the reactor is tied to ground).

4-core 630 mm-sq cable sounds like 4 cores each of 630 mm-sq as used on 400 kV power lines, in which case it carries 4 times the current.

Consider the 2800va (v)olts x (a)mps the same as 2800 watts (at unity power factor). The formula for amps is A = W/E, 2800/120 = 23.33 amps.

The answer choices weren't provided. To use your left hand to determine the direction of the voltage developed in a moving conductor in a stationary magnetic field you must point your forefinger in the direction of the lines of force.

Resistance is measured in Ohms.

Resistance is measured in Ohms.

Resistance is measured in Ohms.

Resistance is measured in Ohms.

It's why the lights are on.

It means that when one increases, the other increases as well. Also, it implies that this increase is proportional - if the voltage is doubled, the current will also double.

Note 1: Normally, the voltage is considered the independent quantity; that's the quantity you can control directly. And if the voltage changes, so will the current.

Note 2: In simple circuits, such as those that only have a voltage source and resistors, the relation will be a direct proportion. With electronic components, such as a transistor, the relationships can be more complicated.

The relation of "minimum" to "phase" in a minimum phase system or filter can be seen if you plot the unwrapped phase against frequency. You can use a pole zero diagram of the system response to help do a incremental graphical plot of the frequency response and phase angle. This method helps in doing a phase plot without phase wrapping discontinuities.

Put all the zeros inside the unit circle (or in left half plane in the continuous-time case) where all the poles have to be as well for system stability. Use the angles from all the poles, and the opposite of the angles from all the zeros, to a point on the unit circle to calculate phase, as that frequency response reference point moves around the unit circle. Now compare this plot with a similar plot for a pole-zero diagram with any of the zeros swapped outside the unit circle (non-minimum phase). The overall average slope of the line with all the zeros inside will be lower than the average slope of any other line representing the same LTI system response (e.g. with a zero reflected outside the unit circle). This is because the "wind ups" in phase angle are all mostly cancelled by the "wind downs" in phase angle only when both the poles and zeros are on the same side of the unit circle line. Otherwise, for each zero outside, there will be an extra "wind up" of increasing phase angle that will remain mostly uncancelled as the plot reference point "winds" around the unit circle from 0 to PI. (...or up the vertical axis in the continuous-time case.)

This arrangement, all the zeros inside the unit circle, thus corresponds to the minimum increase in total phase, which corresponds to minimum average total phase delay, which corresponds to maximum compactness in time, for any given (stable) set of poles and zeros with the exact same frequency magnitude response. Thus the relationship between "minimum" and "phase" for this particular arrangement of poles and zeros.

chock has two terminal plug in live one terminal and test another with test pen.if the test pen light the chock ok

Your question doesn't describe under what circumstances the transformer is being used.

Normally, a two wire (hot and ground) AC voltage can only be a single phase supply. Look up the explanation of how AC current cycles on a sinewave (60Hz is 60 sinewave cycles per second). This is also known as a single phase.

Coming into a standard residential house is a three wire line with two hot wires and a ground wire. The two hot wires are out of phase with each other (opposite sinewave).

A standard transformer can have multiple outputs with various/same voltage. Look up how a transformer works. Without special electronic components for each output circuit, all taps will be in phase. A transformer outfitted with the special electronic components is very expensive and not for normal everyday use.

Cos phi is a European term used on a motor to differentiate between apparent power (kVA) of an inductive load as compared to the active power (kW) that is really used by the load. Cos phi= active power/apparent power.

In North America a more familiar term would be power factor. Power factor = kW/kVA