Electronics Engineering

Never because he can't deal with his own sexuality and has a great deal of self loathing.

Fiber optic terminal box generally refer to the box shape fiber optic management products used to protect and distribute the optical fiber links in FTTH Networks. Usually the fiber optic box includes the fiber optical patch panels and fiber optic terminal box. Fiber optic patch panel is bigger size, fiber optic termination box is smaller. Actually there are too many fiber optic boxes and fiber management devices, they are hard to count the types, many manufacturers will make the fiber optic boxes according to their own design and they may give the fiber optic boxes different names and model numbers.

this type of supply use in satrter,

it is a supply, when we are disconnecting our main supply ,it continue oue operation for few time.

that means a way is make for the supply of our operations

R = resistance = rho * L / S

rho is resisitivity in [Ohm m], it depends on the material (Copper: 2e-8 [Ohm m])

L is wire length [m]

S is wire cross section [m]

EDIT: for high frequencies, you may also wanto to take sink effect into account (~MHz)

On the emitter there is base current which is basically a function of Beta and only at that particular current. Unfortunately the beta factor is a non linear function and it is strictly related to collector current

this always used in inverters and UPS As in standby UPS And line interactive UPS ,the output frequency must be always track the input frequency as it supply the load from utility in standby mode, for any change that will affect the load .

as example the frequency of the utility was with permitted values say 58Hz and suddenly the main power cutout, so UPS must be on same frequency so when convert to backup stored power mode ,the load doesn't affected and power continue to supply the load from the batterys through inverter , so output frequency must be always synchronized to utility frequency (mains) in case of any fault happened, hope i answered your question.

Sherif Salah

R & D Engineer at Arrow Electronics

Egypt

block diagram of CRO means pictorial reprasantation of collaction of all parts of CRO ie.vertical amplifier, delay line,trigger circuit, time base genarator,horizontal amplifier ,electron gun&scree

dc series motor is used for traction...

120 v

The collector voltage is not necessarily approximately zero when a transistor has a collector-emitter short. It depends on whether or not there is an emitter resistor.

A typical collector-emitter circuit has two resistors, one in the collector and one in the emitter. One or both of them might be zero, i.e. not present, depending on design requirements. The collector-emitter junction represents a third resistor, the value of which is dependent on base-emitter vs collector-emitter current ratios and hFe.

If the collector-emitter junction is shorted, then this circuit degrades to a simple voltage divider, or single resistor, and the collector-emitter voltage differential will be approximately zero. Simply calculate the voltage based on the one or two resistances.

Results could be different than calculated, if the resistors are small in camparision to the shorted impedance, and it could be different depending on the base to emitter or collector relationship in that fault state, though the latter case is usually negligible due to the relatively high resistances of the base bias circuit.

If the number of turns in the primary is the same as the secondary, this would be an isolation transformer. Primary and secondary voltages should match (minus the inherent transformer losses), as should the current.

A resistor is used to limit current flow through a capacitor.

If you did not use the resistor, you could potentially create large currents through the capacitor, damaging it. Capacitors do have current limit ratings - check the specification sheet for the capacitor.

Also, in the case of an electrolytic capacitor, if it is generally in a discharged state then it is necessary from time to time to reform it. That process involved slowly charging it, i.e. through a resistor, and then letting it discharge by itself with no or little load. The resistor protects both the capacitor and the voltage source in the case that the capacitor might be shorted.

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Much of the newer overhead cables is made of aluminum with steel reinforcing it for strenght purposes. Aluminimum is much cheap, and much lighter, thus it is cheaper to use vs. copper for high voltage transmission, and copper has a lower resistance which means more electricity can get through the wire/ cable, which means more electricity can get around the world quicker. most people should use copper becasue it has a lower resistance where aluminuim has a bit of a high resistance not to much but a bit so that is why you use copper not alominuim.

yes it can. i cant believe you didn't know that.

Transformer utilization factor is the ration of power delivered to the load and ac rating of the transformer secondary.

Considering an incandescent bulb and using P=VxI

P= Power Watts

V= Volts

I= Current (amperes)

I=P/V

I=75Watts/120Volts = 0.625 Amperes (A or Amps)

Therefore the current through a 75watt bulb that is connected to a 120volt circuit is 0.625 amps.

Viscosity

smoke

Abstract - Cascaded tripping of power lines due to mal-operation

of zone 3 distance relays was one of the main causes of many

previous blackouts worldwide. Encroachment of load into the

zone 3 characteristics is one of the main cause for the maloperation

of the relays. By improving the operation of zone 3 of

distance relays it is possible to prevent such mal-operations so

that cascaded line tripping can be avoided.

A new algorithm that utilizes

Synchronized Phasor Measurements (SPM) to control the

operation of distance protection zone 3. Based on the proposed

algorithm, several improvements in operation of zone 3 can be

achieved. For instance, the relay can differentiate between actual

system faults and load encroachment.

2 bit comparator = 1bit magnitude comparator +1 bit magnitude comparator

if A>B =A(~B)(B bar);

if A<B = ~A.B;

A==B = AB + (~A)(~B);

block of instruction shown above is for 1 bit comparator

means if A>B ==true then High bit is set on (A>B) output.

if A<B true then high bit is set on (A==B) output,

If we cascade two 1 bit comparator then we can design 2-bit comparator...

In monostable multivibrators Circuits (quasi stable state) is one of two states, stable state and quasi stable state which is invoked by an external trigger and it will stay there for value determined by time constant.

Yes DC is periodic with zero frequency........and undefined fundamental time period To........