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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

Why does a rectifier diode is not operated in breakdown voltage?

The breakdown voltage of a diode is the minimum voltage at which it conducts in both directions. If you have a 100-volt rectifier diode (1N4002) and you wire it into a 110v circuit, it will flow current in both directions and you'll get no rectification.

Sound quality between AM and FM?

There are two types of modulations. They are amplitude modulation and frequency modulation. In AM, amplitude of the signal is modified. In FM, frequency is getting modulated. Frequency modulated with carrier waves are transmitted and received by receivers without any distortion.

What is something that a vacuum tube cannot do?

Vacuum tubes cannot eat. Perhaps you could word your question so as to be more specific for the type of answers desired. The word "something" is very broad and permits many answers.

What is an AF amplifier?

AF means audio frequency. Audio Amplifiers can be subgrouped as voltage amplifiers (or pre-amplifiers) and power amplifiers. The voltage amplifier will raise the level of level of the output of a microphone from say 1 mV to 500mV or 1V. The power amplifier will be the interface between this and the load, which is a speaker. The resistance of the speaker is often 4 ohm or 8 ohm. You cannot have a speaker with 1k as resistance! As such to get say 8W output, an amplifier providing 8V will have to pump 1 amp into an 8 ohm speaker. Thus power amplifiers will have to drive a lot of current into the load. Voltage amplifiers cannot do this. A power amplifier sometimes just has unity voltage gain, but has ability to drive a lot of current into the load.

Typical power amplifiers are operated in class B, where for 50% of the signal swing, one transistor provides current, and for the other 50%, the other transistor in a class B provides current into load. Class B amplifiers have cross over distortion, But this can be overcome by pre-biasing, or making the stage operate as class AB. The power amplifiers can also be used to power low resistance loads such as a step up transformer.

What is the open loop gain of an operational amplifier?

Ideally: infinite. Practically: very high, at least 1000 often several million maybe billions.

What does class D amplification mean?

Class-D amplification is where the amplifiers act as electronic switches.

What is system logic?

A positive logic system will output true only when the input is true. A negative logic system will output true only when the input is false.

The NOT logic gate is an example of a negative logic system. That is, NOT( false ) will output true.

What is the disadvantage of line follower robot?

It always need a path to run either white or else since the IR rays should reflect from the particular path (color mostly used white on black).

The rms value of sinusoidal 200v peak to peak wave is?

You can work this out yourself. For a sinusoidal waveform the rms value is 0.707 times the peak value. As you quote a peak-to-peak value, this must be halved, first. Incidentally, the symbol for volt is 'V', not 'v'.

How a Cathode Ray Oscilloscope is used to measure Alternating current?

An oscilloscope is, essentially, a voltmeter -it measures current by measuring the voltage drop caused by that current across a standard resistance.

Why digital multimeter fails to read low resistance values?

They read low resistance values very well. I measured several dead shorts today accurately with a digital voltmeter.

However, when attempting to measure LARGE amount of resistance, the current generator in a standard digital voltmeter may fail to effectively penetrate the medium being measured. It is for this reason that Meggers (Mega-Ohmmeters) are used to measure high amounts of resistance. They usually employ a hand crank to develop the current needed to effectively flow through the medium being measured.

Sometimes digital voltmeters can be very inaccurate if they are measuring something that matches the impedance of the meter (loading effects of the voltmeter), but that is another story.

What is interviewer induced bias?

Opinion or prejudice on the part of an interviewer, which is displayed during the interview process and thus affects the outcome of the interview. In research interviews, it is necessary that the interviewer conduct the interview with total objectivity, so that respondents are not influenced by any outside source in their responses. For this reason, interviews should be conducted by well-trained and qualified interviewers.

Need of frequency compensation in opamp?

Op amps have multistages. Each stage will contribute atleast a pole to the system. The effective effect of these poles will result in instability of system due to

Why digital and analog ground must be separated?

Digital GND has more noise than Analog GND. So never mix up Digital GND to Analog GND to avoid the coupling from Digital to Analog GND

How shunt helps to extend the range of ammeter?

A shunt is connected in parallel with an ammeter.

Any current applied to parallel devices will divide betwen them, so the ammeter will pass only a part of the total current.

What will happen if current is more than required in diode?

If the applied voltage is greater than maximum forward voltage, the diode will get damaged..

Why will one consider an operational amplifier as an ic circuit?

Operational amplifiers are usually bought as an i.c., but they may be constructed with discrete compenents too.

By the way, since i.c. means integrated circuit, your "ic circuit" reads as "integrated circuit circuit".

When a voltmeter is place across a forward biased diode it will read a voltage?

(A) The bias battery voltage

(B) 0V

(C) the diode barrier potentiaol

(D) The total circuit voltage