Electronics Engineering

Each cell area broadcast the information about the that cell in bearer frequency for the following purposes To allow a synchronization in time and frequency of the MSs to the BTS. This synchronization is needed by the MS to access the services of a cell. The frequency and time synchronization procedures that are performed by the mobile To help the mobile in estimating the quality of the link during a communication, by measurements on the received signal from the BTS it is transmitting to, and from the other BTSs of the geographical area. These measurements are used by the network to determine when a handover is necessary, and to which BTS this handover should apply.

To help the mobile in the selection of a cell when it is in idle mode (that is, not in communication, but still synchronized to the system and able to receive an incoming call or to initiate a call). This selection is performed on the basis of the received power measurements made on the adjacent cells' beacon channels. To access the general parameters of the cell needed for the procedures applied by the MS, or general information concerning the cell, such as its identification, the beacon frequencies of the surrounding cells, or the option supported by the cell (services).

automatic tap changing transformers can change their tap setting on their own, manual tap means a person has to manually go out and change the tap setting

No.

I=r/v I is the current, r is the resistance of the reisistor and v is the voltage of the circuit

You have it reversed, my friend.

Ohm's law states: I = V/R

Pasta signal.

Some generators are self excited; this means their terminal voltage is fed back to the excitation system to supply power to the rotor of the generator (which makes it into an electromagnet); the more power that is fed back, the stronger the electromagnet becomes, which makes it harder to turn the generator, which causes the generator to push out more power (simplified, really quick version).

If there is a fault electrically near the terminal of a self excited generator, the terminal voltage will sage to near zero; this means the voltage supplied to the excitation system will drop by the same percentage (say the terminal voltage is 30% of what it should be, then the maximum supplied voltage to the excitation system drops to 30% of what it normally is, since P = V*I). Since the input power is less, the output of the generator will decrease (current will decrease). The terminal voltage is determined by the impedance between the generator and the fault such that V = I*Z; As I decreases, V will also continue to fall, causing the terminal voltage to sag even more.

A non-self excited generator gets its' excitation power from the grid, specifically from a location that is electrically separated from its' terminal voltage. If the terminal voltage sagged to 30% (same fault location as above example), the excitation system voltage may be impacted slightly (say 2%) so the excitation system power is near maximum (98% for this example). Since the excitation system is much farther removed from the terminal voltage, it is not dependent upon it, thus the terminal voltage will not continue to sag as with a self excited system.

Generally pulse amplitude modulation (PAM) is trasmitted as a series of DC levels and are mostly used in wired trasmissions (DC is not effective wirelessly).

Radar Scope happened in 1979.

Examples of open systems in block diagrams include a simple feedback control system, where the output is not fed back to influence the input, such as an electric heater controlled by a thermostat. Another example is an environmental system, like a river flowing into a lake where water enters and exits without feedback mechanisms. Additionally, a basic supply chain model can illustrate an open system where materials flow from suppliers to manufacturers without internal feedback loops.

"50 Hz" is the shortened form of "50 hertz" which means "50 cycles per second".

50 Hz is the frequency of alternating current (ac) used by national electricity power services in many countries in Europe and elsewhere in the world whilst in USA, Canada and many other countries it is 60 Hz.

Current.

silicon

Synchronous demodulation is done using the same modulating signals such as cos(2000t) that was used in the transmitter. It still has to use Band-Pass (if multiple signals are present) and Low-Pass filter

Its deterministic.

See the diagram here: http://i45.tinypic.com/25hzskj.jpg

here a, b, p, q are states (outputs) and x, 0, 1 are inputs.

50%

Imagine a rectifier as a valve that only allows electrical current to flow in one direction. When using a single rectifier you end up with half of the wave cycle being cut off (when the cycle turns negative). In many applications a full wave rectifier would be far more desirable. By configuring four of the rectifiers it is possible to make what's called a full wave "bridge".

The link below shows how a full wave bridge works.

http://hyperphysics.phy-astr.gsu.edu/Hbase/electronic/rectbr.html

ANSWER: It will rectify the input into pulsating DC of twice the input frequency minus two diodes drop 1.4 volts

Assuming that you are referring to a piece of equipment designed for 60-hz power being connected to a 50-hz power line (common overseas), It depends on the application. If the load is a DC power supply, they are often rated for both 50 and 60 hz. If the load is a motor made for 60 hz, for example, it will run about 17% slower at 50 hz than at 60 hz due to the design of induction motors, and at higher current because of lower inductive reactance. If the load is fluorescent lighting, it may display an annoying flicker, and the ballasts will probably die an early death. If the load is transformer-powered, you'll have the same current problems as you get with the motor. OTOH, if you want to connect a 50-hz load to a 60-hz supply, it has its own issues. E.g., the motor will run faster and cannot be loaded as heavily. Best bet: research to see if the piece of equipment is rated for both frequencies.

rollercoasters are really fun

NO

pnp answer

In electronic gears we use voltage bridging, that is a relative low output impedance to a higher input impedance. Usualy the input impedance is more than ten times higher then the output impedance.
An input impedance is called also a load impedance or an external impedance.
An output impedance is called also a source impedance or an internal impedance.