GATE Electronics|Electrical

How to make effective short notes for GATE?

Making effective short notes is also an art, which is really important in cracking the exam, since the syllabus is huge.

🔹 Firstly, you should study the topic very well and solve all previous year questions(each and every question) related to that topic.

🔹When you have thoroughly studied the topic and questions make a note or mark important points and concepts that are repeatedly asked in past exams.

🔹You’ll find some exceptionally good questions from gate exams that require crystal clear conceptual approach,remember to add them in short notes.

Now follow some points

✔️Take a blank drawing chart(comes around 4 or 5 rs per chart)

✔️Starting from the beginning try to cover a fair part in concise ways and add only important points and go till the end to give complete touch of the subject.

✔️Try to cover all types of question from a topic and just write the formula or approach to be used.

✔️Add a conceptually good question in concise way to revise the concept in every go ,along with the formulas and a definition for important concepts.

✔️Use a highlighter to mark utmost important formulas.

✔️Add the mistake warning if you commit some silly mistake while solving question that is important (eg in Test series or solving previous years).

✔️Write always in your words which you feel comfortable as these notes are only for you.

Stick the chart on the wall

Keep revising…..

the chart technique is very helpful in learning complex formulas very easily, as photographic memory lasts longer.

By Shivom Bhargava, Mtech (IIT Kanpur)

Read this book guys, it is amazing

Shaum Series on Digital Electronics

Define a memoryless system.

Ans. A system is memoryless if the output at any time instant depends only on the input at that particular instant, it is also called as static system.


@GateElectronics

What are even signals and odd signals? Give their expressions.

Ans. Odd signals are symmetric in the first and third quadrant.

Given as              f(-t) = -f(t)

Even signals are symmetric in first and second quadrant.

Given as              f(-t) = f(t)


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What are the methods to generate SSB?

Ans. (i) Filter method: double side band signal is passed through filter to get single side band signal.

 (ii) Phase shift method: phase shift using Hilbert transform is done to generate SSB signal.

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Why direct sequence spread spectrum secure?

Ans. Direct Sequence Spread Spectrum (DSSS) is a spread spectrum technique whereby the original data signal is multiplied with a pseudo random noise spreading code. This spreading code has a higher chip rate (this the bitrate of the code), which results in a wideband time continuous scrambled signal. The steam of information in DSSS is divided into small pieces, each associated with a frequency channel across spectrum. Data to be transmitted is combined data based on spreading ratio. The chipping code is a redundant bit pattern associated with each bit transmitted. This makes the communication safe and secure.


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Tunnel Diode:

A normal p-n junction diode exhibits doping concentration of about 1 part in 10⁸ (1 dopant atom in 10⁸ Si or Ge atoms). If the doping level is further increased, say about 1 part in 10³, we see the change in characteristics of diode. As a result, the depletion layer gets very narrow. In comparison with the conventional diode, the depletion layer of tunnel diode is 100 times narrower.

Read more about tunnel diode here:

https://electricalvoice.com/tunnel-diode-symbol-working-applications

Explain the difference between sensitivity and selectivity?

Ans. The sensitivity of an electronic device, such as a communications system receiver, or detection device, such as a PIN diode, is the minimum magnitude of input signal required to produce a specified output signal having a specified signal-to-noise ratio, or other specified criteria.

Selectivity is a measure of the performance of a radio receiver to respond only to the radio signal it is tuned to (such as a radio station) and reject other signals nearby in frequency, such as another broadcast on an adjacent channel.

In communication, the sensitivity of a communication receiver is the ability of communication receiver to satisfactorily work on weak signals while selectivity of a receiver is the characteristic that determines the extent to which it is capable of distinguishing between the desired and undesired signals.




@GateElectronics