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Electronics Engineering
Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.
24,372 Questions
What is the effect of value of filter capacitor on ripple voltage?
Ripples in electricity are usually defined as small, unwanted variations due to direct current. The effect of using a filter capacitor in this environment may vary, but usually has a smoothing effect on the ripple.
What are the factors on which the heat produced the electric current depends upon?
It depends on
1 the resistance of wire.
2the voltage between the ends of the wire.
3the flowing current time.
What is approximate turns ratio of the centre-tapped transformer used?
It depends on the voltage ratio of the transformer. If you know the primary and secondary voltages, then you can work it out for yourself.
What is negative feedback of a closed loop system?
Negative feedback is a feedback where it is used in negative side in a closed loop system.Such as a inverting side feedback in op-amp.
What is the disadvantage of using the centre tapped full wave rectifier?
it can be driven by a single source voltage, such as the untapped secondary of a transformer or directly from the power line.
The peak reverse voltage that can be tolerated is 2x the reverse breakdown of the diodes.
What is the power when there is 500 mA of current through 4.7 Kilo ohm's of resistance?
Ohm's Law: Voltage is current times resistance, so 0.5 A through 4700 Ohms is 2350 volts. Power Law: Power is voltage times current, so 2350 volts times 0.5 A is 1175 watts.
WARNING: This is both high voltage and high power. Do not attempt to duplicate this in the lab without adequate protection and appropriate components.
When a transistor is used as an amplifier increasing the base current will cause an increase in?
Increasing base current causes a proportionate increase in collector current - proportionate to hFe, unless the transistor is operated outside of linear mode.
What is B.H.P in 3 phase induction motor?
BHP stands for 'brake horsepower', and simply means it is describing the output, rather than the input, power of the machine. Although a motor's output power is expressed in horsepower in North America, elsewhere it is expressed in watts.
Can I use a small DC electric motor as a generator to light up several LED's in a project?
Yes you can, the power will not be stored though, the LED's will only light when the motor is turning and their brightness will depend on the velocity of the motor's revolutions. Dont forget your resistor.
Does increasing the plate area of a capacitor increases the capacitance?
Yes. Increasing the plate area of a capacitor increases the capacitance. The equation of a simple plate capacitor is ...
C = ere0(A/D)
... where C is capacitance, er is dielectric constant (about 1, for a vacuum), e0 is electric constant (about 8.854 x 10-12 F m-1), A is area of overlap, and D is distance between the plates. (This is only a good estimate if D is small in comparison to A.) Looking at this, you can see that capacitance is proportional to plate area.
Which rectifier is not directly operated from mains?
Because , the high voltage can destroy the diodes used in the rectifier .
What happens when the emitter bypass capacitor is shorted?
Then gain becomes equal to hFe and thermal runaway becomes a problem. Further, the reduction of gain as frequency decreases is eliminated, so the stage's operation as a high pass filter is compromised.
What is the value of ripple in the ideal dc power supply?
In an ideal DC power supply, there is no ripple.
Can transistor be used to increase the strength of an ac signal?
Yes, a transistor can amplifiy an a.c. signal.
Is AC voltage measured from Peak to Peak or from 0 to peak?
Both. When an AC voltage is measured and a number is reported, it is necessary to state that this number is rms value or peak value or peak to peak value.
AnswerVoltages and currents are each normally expressed in root-mean-square (rms), unless otherwise stated. For example, when we talk about a '120-V service' or a '240-V service', we are expressing the voltages in rms values; it is unecessary to specify that these are rms values. For a sinusoidal waveform, Vrms = 0.707 Vpeak
What is the resistance value of a 2.2 megohm resistor?
A megohm is 1,000,000 ohms, so 2.2 megohms is 2,200,000 ohms, often abbreviated to 2.2M, or 2.2Mohm, or 2M2.
What is the signal type is characterized by continuous amplitudes in continuous time?
An analog signal is characterized by continuous amplitudes and continuous time.
What does micro farads measure?
A microfarad measures electrical capacitance. A farad can be defined as the charge in coulombs, which is 1 ampere per second, that a capacitor will accept for the potential across it to charge one volt. A microfarad is equal to one millionth of a farad.
What is cut in or knee voltage of Si and Ge?
For Si it is 0.6or 0.7 and for Ge 0.3 or 0.2.Both values correct for both si and ge
Why electronics device used dc current only?
DC direct current is be coming more popular than AC alternating current
AC is not really suitable for some devices maybe your device is needing low current
Why diode conducts current in forward bias but does not conduct in reversed bias?
If the reverse voltage exceeds the reverse breakdown voltage, current flows in a diode in reverse bias.
In an ordinary diode, this can destroy the diode unless current limiting is provided. In a zener diode, this is designed to be the normal operating mode of the diode.
Also, even below the reverse (or forward) breakdown voltages, current can flow due to parasitic leakage.
What is a 2N2369 transistor.
It's an npn switching transistor.
What is the sampler and mixer in current series feedback amplifier?
Here it is the current sampler and it is connected in series.
while the voltage mixer connected in series.
