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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 adaptive modulation?

Adaptive delta modulation is a analog-to-digital and digital-to-analog conversion technique which is primarily used for voice transmission data and can be used for multiple purposes.

What is instrumentation in Research?

A research instrument is the source from which the research came from. A book or an entire library can be a research instrument.

What is control program?

the computer is what runs the car and all the engine functions, you can change the functions of the engine to get more power by buying a performance programmer and downloading the program into the cars computer.

theres your answer :)

'why can't we determine barrier potential by using a voltmeter connected across the ends of a diode'?

The barrier potential is not a voltage created inside the diode. instead, it refers to the depleted zone around the juncture.

Since this region is deplete from carriers (electrons or holes), it became a virtual isolator. In order to make the depleted zone conductive, you need to apply an external voltage to the diode terminals.

If the voltage is in forward bias (+ to the anode and - to the cathode), you will need 0.2/0.3 V for germanium diodes and 0.6/07 V for silicon diodes. You need an external diode to keep the forward current with safe limits.

If the voltage is in reverse mode (- to the anode and + to the cathode), you will need to apply much more voltage to achieve conduction, although this could permanently damage the diode. Zenner diodes, for instance, always work in reverse bias to create a stable voltage, which is used for regulation purposes.

What does laser iridotomy treat?

Laser peripheral iridotomy makes an opening in the iris allowing the fluid to drain, argon laser trabeculoplasty is aimed at the fluid channel opening to help the drainage system function.

How long until MRI scan results come back?

For me, it took about five days. Though my doctor told me it could be anywhere from three days to two weeks. For me, it took about five days. Though my doctor told me it could be anywhere from three days to two weeks.

What is Transistor Switching time?

Transistor switching times: The turn-on time of switching transistor sum of delay time (td) and rise time (tr). ton = td + tr. Delay time (td): It is defined as the time during which the collector current rises from zero to 0.1ICS.

What is the nature of the current voltage graph for an unknown resistor?

Fixed-value resistors are normally manufactured so that they obey Ohm's Law -that is, the ratio of their voltage to current remains constant for variations in voltage, within specified limits. In other words, their resistance value remains constant for variations in voltage. This would produce a straight-line curve when plotted. Devices and materials that do not obey Ohm's Law (e.g. semiconductors, etc.) would produce a curved line.

What are advantages of bridge rectifier?

A bridge rectifier will rectify both halves of a sine wave and give "continuous output" through 360 degrees of the input. Oh, and you don't need a center-tapped transformer to use it.

What is difference between modulated wave and carrier wave?

Carrier Wave:

A carrier wave is a high-frequency electromagnetic wave that is used as the "carrier" or the base signal in a modulation process.

It is typically a pure sine wave with a constant frequency and amplitude.

The carrier wave by itself does not carry any information; it serves as a vehicle to carry the information from one location to another.

In AM and FM radio broadcasting, the carrier wave is the primary signal transmitted by the radio station.

Modulated Wave:

A modulated wave is the result of combining the carrier wave with an information signal, such as an audio signal or data.

Modulation is the process of varying the characteristics of the carrier wave (either its amplitude or frequency) in accordance with the information signal.

There are two common types of modulation: Amplitude Modulation (AM) and Frequency Modulation (FM).

In AM, the amplitude of the carrier wave is varied in proportion to the amplitude of the information signal. This variation encodes the information onto the carrier wave.

In FM, the frequency of the carrier wave is varied in proportion to the amplitude of the information signal. This variation encodes the information onto the carrier wave.

The modulated wave contains the information that needs to be transmitted, and it can be demodulated at the receiving end to retrieve the original information.

Is lovely professional university good for btech?

Lovely Professional University is one the best choice for B.tech. One single place where in you can find all the standards done at power.

LPU with its stellar record is easily the best among the lot.

LPU is a well-known university that offers top-notch instruction, cutting-edge methodology, and unequalled placements on both the national and international levels. LPU offers its students excellent academic exposure. It gives the students the opportunity to attend guest lectures or workshops so they can learn as much as possible. In order to put their knowledge into practise, the students also work on real-world projects. When creating a curriculum, it is one of the few that has incorporated worldwide practises. LPU has experimented with books, interactive problem-solving interactions, and working through real-world applications in place of traditional school textbooks and lectures.

The university provides ample opportunities to each and every of the eligible students to secure good placement. Special inputs in the form of placement classes are given to students to hone their skills and prepare them for placements. The university leaves no stone unturned to shape the future of its students. It is definitely the first choice of both national and international students. LPU has become the landing place of many leading industries for recruitment. It has many top rankings in placements.

Companies which recruit from IIT's, IIMs also recruit the students of LPU. Companies like Microsoft, Google, Amazon, Cognizant Technology Solutions, TCS, Tech Mahindra, Amdocs, Capgemini, Verizon, Qualcomm, Drishti Soft Solutions, L&T Infoetch, Tek Systems, Alight Solutions, Tivo Corporation, Wipro, Interviewbit, LG Soft India, PEGA, Bosch, Samsung, Voltas, Lava, Vodafone, ,L&T Infotech, PEGA, hp, LG Soft India, Capgemini, Hind Rectifiers, Verizon, Hitachi Power, Videocon, L&T Technology Services, Ericsson, HCL Technologies, Asahi India, Ceasefire Industries, Sandhar Technologies, Indus tower, KEC International and many more visit lpu for placement of students.

Hope this information Helpful!!!!

Explain with necessary circuit diagram the basic priciple of a cathode ray oscilloscope with electronic control system?

"How to use an oscilloscope."Here's a few notes on how to use an oscilloscope. First off I am going to show you one very important point using my oldest oscilloscope and that is - they haven't changed at all!

If you study the picture below then you'll see that all modern oscilloscopes follow the same basic pattern.

OK these days they have more functions (and are now digital) but the basic method: how to use an oscilloscope remains the same.

Even digital oscilloscopes follow the same basic pattern of the original oscilloscope design.

So looking at them is just as relevant now as it was 20 years ago and its one of the measurement methods that has not changed except for modernizing it into DSPs.


How to use an oscilloscope : Older oscilloscope controls are still relevant today

Tip: For a digital oscilloscope all you need to know is the location of the 'Reset button'!!! - this will get you out of all trouble as you can set up digital oscilloscopes in many different ways and they often have options buried in the depths of the menu system.

Note: Before hitting the reset button - if someone else has been using it - save the settings (and possibly data) to an internal floppy drive or over the network to your hard disk - this will save you getting into trouble if someone else was using it.

How to use an oscilloscope (or CRT) : Find the beam!The cathode ray oscilloscope (above) is the original oscilloscope and uses a high voltage cathode ray tube. Electrons are forced off a plate at one end using very high voltages (1000s of volts) and guided by electric fields to the phosphor screen that fluoresces when hit by an electron.

Note: Never open the oscilloscope as these voltages are extremely dangerous they are high current and high voltage. Even 10mA at 250Vac can kill and voltages in the oscilloscope are far higher.

The first thing you need to know about it is how to find the beam! Unlike a digital scope it does not test the inputs and set itself up for the most appropriate display mode for you - with the CRT you have to do this yourself. Here's the bits that need setting up:

  1. Timebase
  2. Intensity
  3. Input
  4. Trigger
  5. Level

Note: You have to set all of these appropriately - setting any one incorrectly will result in an invisible beam.

TimebaseThe timebase sets the time that the beam is scanned from left to right on the screen and it's calibrated in horizontal divisions (the black grid on the front of the screen).

The timebase (picture to left) is set to 0.5ms/DIV which means that the beam (ray) is moved through each horizontal division over the period of 0.5ms. So the time for going from left to right covering the whole display is 10x05.ms = 5ms (a frequency of 200Hz - 200 times a second) - for finding the beam this is a reasonable time.

Make sure that X-Y mode is not selected as this disables the timebase - on this oscilloscope it is one of the controls to the right (black button in the green area).

How to use an oscilloscope: Intensity

Sets the amount of electrons hitting the phosphor screen and it can be set it to zero - so you won't see a thing! So set it to about ¾ full brightness.

Note: After you have found the beam turn it down as if you leave it on for a long time at a high intensity the phosphor burns leaving a permanent line in the phosphor.

How to use an oscilloscope: InputEach channel on the oscilloscope is really just a high quality amplifier with low noise, high bandwidth and selectable gain which connects to the vertical deflector in the oscilloscope.

So if there is any input signal it will be amplified possibly moving the beam out of the display! set the channel input switch to ground (this switch is labeled DC, AC, GND). Setting it to ground connects the input of the amplifier to ground and ignores the input signal.

Note: Remember to switch it back to DC or AC after beam finding otherwise you won't see any measurement!

How to use an oscilloscope: TriggerThe trigger detects when to start moving the beam to the right across the display. Setting this to Auto makes the beam trigger continuously.

It triggers continuously using the internal timebase unless there is an input signal in which case that is used instead i.e. you always see the beam regardless of the input signal.

Note: If it is set to NORM then the oscilloscope won't trigger (unless there is an input signal) so again you won't see anything!

How to use an oscilloscope: Channel LevelThe level adjust control moves the channel beam up and down on the display so you need to adjust it as the beam may be positioned outside the display. Each channel has a level control located beside the channel amplifier (here it's on the far right). How to use an oscilloscope : Setting up.Most oscilloscopes have a test point that generates a low frequency square wave (~1kHz) and you can use it to setup the oscilloscope and the oscilloscope probes.

First of all adjust the focus and intensity (after finding the beam) to get the best looking display - a nice sharp line.

Then set the input to ac and plug in the probe to the channel you are looking at and then attach the probe tip to the test point. You should then see the square wave - adjust the channel amplifier until its a good size in the display screen.

How to use an oscilloscope : Adjust a x10 probe.Each probe has an adjustment screw terminal for probe compensation of the x10 mode.

Note: Times 10 means that the probe divides down the input signal by a factor of 10. Inside the probe in addition to the resistive divider is a capacitive divider - the screw terminal is adjusting one of the capacitors.

Adjust the trigger level so that the signal is stable and you can see a stable square wave.

Adjust the probe while looking at the signal so that the square wave has sharp edges at all corners i.e. shows high frequencies accurately.

There may be undershoot (rounded corners) or overshoot (spikes at the corners) just adjust the screw terminal until these disappear and you have no overshoot and no undershoot.

You have now adjusted the probe correctly.

How to use an oscilloscope: Making measurementsThere are two fundamental things you can measure with an oscilloscope
  • Voltage
  • Time
How to use an oscilloscope : Measuring Voltage and frequencyUsing the channel amplifier setting you can measure voltage here the amplifier is set to 0.2V per (vertical) division.

Just adjust the channel amplifier setting until the signal you are looking at 'just' fills the screen - this gives the maximum (most accurate) view of the signal.

You can measure DC or AC signals by selecting the appropriate switch setting.

GND sets the input of the channel amplifier to ground ignoring the input signal and it useful to find out where the zero volt reference is on the screen.

How to use an oscilloscope: Measuring DC signalsBefore you measure a steady DC signal set the switch to GND and move the trace to the lowest horizontal graticule (black lines on screen). This sets the zero voltage position - now set the switch to DC and put the probe on the DC signal - adjust the channel amplifier to keep the signal on screen.

Count the number of divisions and multiply by the channel amplifier setting to read the voltage. Of course its easy to select an easy voltage and amplifier setting to start with e.g. 5V with a 1V/division setting will make the trace move up 5 graticule divisions.

How to use an oscilloscope: Measuring AC signalsAn AC signal is simply Alternating Current and is more commonly used to describe an alternating voltage as well and the text book AC waveform is the sinewave.

To make the measurement the amplifier settings are used in the same way as a DC measurement but now you need to start with the ground reference in the middle of the screen. So set the input switch to GND and move the trace up to the center then set the input switch to AC.

You need to do this as an AC signal moves above and below ground so to see the whole signal you need the ground reference in the middle.

Now set the trigger level and adjust the channel amplifier so that the signal fills the screen and is stable. Here's an example of a AC sinewave centered about the mid graticule.

Here settings were:

Timebase : 0.5ms/div

Amplifier: 1.0V/div

So for a quick look the signal period is (looking at the rising edge where it crosses the zero axis - ~4.7 divisions or

5.2* 0.5ms = 2.6ms

So the frequency is 1/2.6ms = 384Hz

The peak voltage is

1V/div * 2 div = 2V

and so the Vrms = Vp/sqrt(2) = 1.41Vrms.

Note: The zero axis is shown by the other channel that is switched to ground - it just helps you to see the signal more easily and is not essential.

But this is not the most accurate way you can measure the signal - to do that you have to maximize the displayed signal.

In the image to the right only half the signal is displayed because you know that a sine wave is repetitive and symmetrical. So you only need to see half the signal to fully characterize it.

Here settings were:

Timebase : 0.2ms/div

Amplifier: 0.5V/div

Half the period of the signal is 6.6 divisions

so

Half period : 6.6 * 0.2ms = 1.32ms,

Whole period : 2 * 1.32ms = 2.64ms

So there is an extra digit of accuracy obtained and the frequency is

1/2.64ms = 378.8Hz

Peak voltage is 4.2 divisions so

0.5V/div * 4.2 div = 0.5 * 4.2V = 2.1Vpeak

So Vrms = Vp/sqrt(2) = 1.49Vrms

Note: This measures the period in the most accurate way I'll leave you to figure out how you could measure both period and amplitude more accurately.

Tip: Buy a digital oscilloscope : All these calculations are done for you in real time - if you buy the right one - some also give you standard deviation, jitter and all manner of other measurements done using dsp.

What happens if you add more batteries to a circuit?

Depends on how you add them. Added in series, the voltage will increase, maybe to the point of damaging the LED. If the LED survives, it will shine brighter.

Added in parallell, the LED will shine the same, and will be able to shine longer before draining the batteries.

Why isn't silicon in the connecting wires of electric circiuts?

The primary reason we don't use silicon in wires in electric circuits is because it is not a conductor. Recall that "wires" in electric circuits are conductors, and conductors will allow electric current flow through themselves without a lot of resistance.

Silicon is what we call a semiconductor material. That means it "sorta" conducts, and "sorta" doesn't, depending on the conditions we set up when we manufacture it. There may be other reasons for not using silicon, but next to copper or aluminium, silicon doesn't conduct very darn well.

How do you find the power factor with true and apparent power?

to put out the power fector you have to divided apparent power with true power.

Answer

You can determine the true power of any load using a wattmeter. To find the apparent power, you use a voltmeter to measure the supply voltage and an ammeter to measure the load current, and multiply the two readings together.

If you then want to go on to find the power factor, then you divide the true power by the apparent power. If you want to find the reactive power you use the following equation:

(reactive power)2 = (true power)2 x (apparent power)2

What is the Difference between resistive and reactive load?

A resistive load is one which does not power a motor. Examples of resistive loads would be light bulbs, toasters, stereo systems, televisions, hot plates and convection heaters. To calculate the wattage required to run these items, simply multiply input amps x volts for each individual item, then add those figures together to get the total wattage required. For example, 5 light bulbs at 60 watts each would be a total of 300 watts. If you want to add a 1500 watt hot plate, your total is now 1800 watts. Adding some music from a radio would add another 100 watts, and so on. • A reactive load is one that is usually associated with some type of electric motor. Examples of reactive loads would be circular saws, furnace motors, water pumps and air conditioners. This type of load may take three times the rated power requirement to start up and perform the required work. An example of this would be an air conditioner that runs on 20 amps at 120 volts. The running watts would be calculated.

Circuit diagram of RC coupled amplifier?

One of the several uses of an RC coupled amplifier is to amplify the given input signal. It makes use of a sinusoidal input signal.

What are the differences between digital and analog circuits?

Analog circuits operate on a continuous range of voltages. For example, an audio signal may range anywhere from 0V to 1000mV, and an infinite number of places between. Digital circuits operate on only one of two states: "off" or "on", typically represented as 0 and 1. These on and off states are represented by different voltages in different systems. But any given digital signal will have one of only two distinct values. For example, a typical digital signal will dictate that anything below 1.0V is considered "off", and anything above 4.5V is considered "on". Information in digital circuits is represented as either a consecutive stream of these on and off states ("serial") (ex: 10010110) or a set of signals together representing a value ("Parallel") where 8 wires represent 8 bits of a one byte value.

What is depletion region in PN junction?

when the p type semi conductor is connected to n type the electrons in n type migrates towards p type to fill the vacancy i.e holes in p type. As a result accepter ions are developed in n type and donor ions in p type which restrict further movement of electrons and holes . this layer of donor and accepter ions at the pn-junction is called depletion region. and across this region a potential is developed which is called barrier potential.

Active and passive components?

Electronic components are divided into active and passive categories. Passive components are those that do not exhibit gain or directional characteristics. They include resistors, capacitors and inductors.

Active components are those that show a gain, such as a voltage or current gain, or have a directional characteristic such as a diode conducting only in one direction. Transistors, diodes, triacs and SCRs are examples.

There is something of a debate about certain other components. Transformers, motors and relays are sometimes called active and sometimes not. It is perhaps more important that their function is understood than how they are classified.

What is magnetic flux measured in?

The SI unit of magnetic flux is the weber (in derived units: volt-seconds)

What are the parts and its function of electric motor?

1. Armature coil

2. Field magnets

3. Split or Slip rings

4. Carbon or metallic brushes

Define the bandwidth of a frequency modulated signal?

I believe the bandwidth of ANY signal is defined as the range of frequencies

that encompasses 99% of the signal's power.

For an AM signal at anything less than 100% modulation, it's 2 x the highest

modulating frequency.

FM signals aren't that simple to characterize. "Cramer's Rule" says that the

bandwidth is 2 x (peak deviation + highest modulating frequency), but as

the 'modulation index' increases, that rule becomes a poorer approximation.