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Electronics Interview Questions & Answers - Learning Mode

Electronics Interview Questions & Answers - Learning Mode

Electronics is the branch of science that deals with the study of flow and control of electrons (electricity) and the study of their behavior and effects in vacuums, gases, and semiconductors, and with devices using such electrons. Electronics means study of flow of electrons in electrical circuits. The word Electronics comes from electron mechanics which means learning the way how an electron behaves under different conditions of externally applied fields. IRE - The Institution of Radio Engineers has given a definition of electronics as "that field of science and engineering, which deals with electron devices and their utilization."

Try Electronics Interview Questions & Answers - Exam Mode

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Electronics Interview Questions & Answers - Learning Mode
Try Electronics Interview Questions & Answers - Exam Mode
Question: What is the difference between Photodiode and Solar cell?

Answer: A photodiode is made to detect light quickly a solar cell is made to collect energy from light. They are both typically silicon diodes, but modified to meet their different requirements. A photodiode has to be fast, which means low capacitance, which means small area of silicon. Therefore, it is not very sensitive, and cannot generate much power from light. A solar cell has as large an area as you can afford to buy, getting watts per square inch. There are other differences in the way they are m Source:
Question: How do you make a memory card of mobile phone?

Answer: A memory chip stores bits and mounted in a card with electrical contacts so a computer or camera can send data to be stored. There is not much more to it than that. Source:
Question: Explain negative test cases for testing
mobile phones?

Answer: Negative test cases for testing mobile phones:

1.removing the SIM card and made a call invalid phone number
3.made a call at which there is no tower signal
4.Made a call after removing the battery or at no power in battery and also we can add some more points... Source:
Question: How can the electromagnetic can travel in air and not lose any information contained in them?

Answer: There is a limit to how far you can get television signals. The power is spreading out the farther you are away from the source. At some distance, you reach a point where the noise in the atmosphere becomes greater than the signal, and you can no longer extract all the information from the signal. Digital television has much error correction, many bits are sent just so corrections can be made when there are errors. This helps on the fringe, but even this fails when the signal gets weak enough. H Source:
Question: How many memory locations can be addressed by a microprocessor with 14 address lines?

Answer: no of memory locations that can be addressed is 2 to the power of no. of address lines i.e. 2 power 14 Source:
Question: What are encoder and the decoder? What are the uses of these two devices? Also, write about how it works with circuit diagram.

Answer: There are zillions of things in electronics called encoders. You can look up LCDs and NAND gates as well and this is really basics. Source:
Question: How can we prove that radio waves are sine waves? What makes them sine?

Answer: Fourier says that only a sine wave has no harmonic content. The math works out that if you have any wave shape other than a sign wave, you can break it down into a group of sine waves of different harmonic frequency, phase, and amplitude. All those harmonics go to zero when the wave shape is a pure sine. We can tell that radio waves behave like a sine, you can run them through a narrowband filter, and no energy is lost. Maxwell's equations predict propagation and fields based on a sine wave, Source:
Question: what is 555 timer

Answer: 555 timer is used to generate time delay and also used as counter Source:
Question: Is it possible to build an AC or DC variable-speed generator with a variable field current, controlled by a signal from a torque sensor connected to the shaft of the generator (i.e., net torque = 0)?

Answer: You can control the field with anything, but why would you do it with torque? Why do you say net torque=0? What is the significance of variable speed?

I am trying to think of why you would do this. If the torque were low, you could increase the field to generate more energy, which would make the torque go up. That is positive feedback, but maybe it is constant power into a resistive load (voltage would go up). If you did negative feedback, that would mean the field would reduce as the tor Source:
Question: Which type of architecture 8085 has?

Answer: CISC Architecture Source:
Question: Why does charging batteries take lengthy periods? What can be done to quicken the speed?

Answer: Batteries work through a chemical process, some kind of ion exchange where the battery contains two elements that want to combine ions and give up an electron to cause current flow. They do this energy release all by themselves with no energy added, it wants this exchange to happen it is more stable after the reaction. Therefore, to charge the battery you are forcing things to go backwards, which the reaction does not like. By adding a current, you are making the reaction reverse. This is not an Source:
Question: What is the difference between TDMA and FDMA?

Answer: TDMA:
Time division multiple access (TDMA) is a channel access method for shared medium (usually radio) networks. It allows several users to share the same frequency channel by dividing the signal into different time slots. The users transmit in rapid succession, one after the other, each using his own time slot. This allows multiple stations to
share the same transmission medium (e.g. radio frequency channel) while using only a part of its channel capacity. TDMA is used in the digital 2G Source:
Question: How is the transmission of a signal in a computer over x number of clock cycles translated into binary?

Answer: All computer logic today uses FETs as switches. A FET is a switch with gain, meaning that a small signal change on its input (the Gate) causes a bigger signal in the Drain. Bigger does not mean bigger voltage, it usually means more current at the same voltage, so it can drive many other inputs after it. Two FETs can be connected together to make a logic gate, like an AND function. In addition, gates can be connected together to make flip-flops and counters and adders, etc.

Logic "1" is us Source:
Question: Is it possible to reverse the order of a Variable Frequency Drive? Ex: I want to be able to create 120v power from a variable speed engine, with at least 6kw of power.

Answer: You say many alternators, but really, you need only one. The more I think about this, the more I think it is not so hard to do. If you have a 6KW alternator, it's possible that it has some kind of voltage regulation, maybe the rotor is not a permanent magnet, but an electromagnet with ring brushes, and there's a regulator circuit that drives this to keep the voltage constant regardless of frequency. If this is the case, what I would do (not many would try this) is rectify this to make 15 Source:
Question: Can you explain electricity at atom level and if possible show some diagrams please

Answer: If you look at the classic Bohr model of the atom (from 1913), you have electrons orbiting around a nucleus of protons and neutrons. Normally there are as many electrons (negative charge) as protons (positive charge), so the net charge of the atom is zero. The various shells or orbit radii of the model have different characteristics as to how many electrons they are happy having orbiting in them. The first shell likes 2 max, the 2, and 6, etc. If there is one less electron that what the outermos Source:
Question: The current through a resistor of 50 ohms in an AC circuit at t = 0.008 s is 65% of the peak value. The smallest possible frequency of the generator delivering the current is

Answer: If it is then this is easy, you take the arcsine of 65% that gives you what angle you are at in the sine cycle, take the ratio of that to 360, and multiply that by 8mS to get the time of a full cycle, and then take one over that to get frequency. This will be the lowest frequency. Note that the 50 ohms has nothing to do with it, other than implying it is an RF circuit where 50 ohms is common. You say "smallest possible frequency" which also is not very clear I will assume you mean lowest frequen Source:
Question: What will be the common test case for SMS and Mp3 player applications?

Answer: There might be many common test cases: Here are 2
1. For SMS: It uses UDP protocol
2. for MP3: Audio streaming also uses UDP protocol

1. for SMS: For entering text for SMS, you need to open Text editor.
2. for MP3: For entering/editing play list names, text editor should be opened.
So, the test cases written for text editor can be used for both applications. Source:
Question: Why do I not see the battery and capacitor combination for power backup?

Answer: There are "super capacitors" that are used for power backup - they are efficient for short-term power take-over, but they are leaky and are not good for long term. Batteries tend to die slowly, more slowly than the leakage on a power backup capacitor, so the capacitor does not do any good. Regular capacitors store so little energy they cannot really be a power source. Source:
Question: What is the router?

Answer: In a network, multiple systems are use to be conncted. a router is simply a device which is having a multiple ports to connect number of systems with each other in a network Source:
Question: Do you have any ideas how to make a ping-pong ball launcher that reloads automatic and shoots automatically?

Answer: Air cannon is probably the simplest, PVC pipe from Home Depot and shoots things very far, can make any size you want, need a tire pump or air compressor to power it. It is also called Potato Cannons for obvious reasons. I shot a potato over 1000 feet with 60 psi and 2" pipe. Source:

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Latest 20 Questions
Payment of time- barred debt is: (a) Valid (b) Void (c) Illegal (d) Voidable
Consideration is defined in the Indian Contract Act,1872 in: (a) Section 2(f) (b) Section 2(e) (c) Section 2(g) (d) Section 2(d)
Which of the following is not an exception to the rule, "No consideration, No contract": (a) Natural love and affection (b) Compensation for involuntary services (c) Completed gift (d) Agency
Consideration must move at the desire of: (a) The promisor (b) The promisee (c) The promisor or any other party (d) Both the promisor and the promisee
An offer which is open for acceptance over a period of time is: (a) Cross Offer (b) Counter Offer (c) Standing Offer (d) Implied Offer
Specific offer can be communicated to__________ (a) All the parties of contract (b) General public in universe (c) Specific person (d) None of the above
_________ amounts to rejection of the original offer. (a) Cross offer (b) Special offer (c) Standing offer (d) Counter offer
A advertises to sell his old car by advertising in a newspaper. This offer is caleed: (a) General Offer (b) Special Offer (c) Continuing Offer (d) None of the above
In case a counter offer is made, the original offer stands: (a) Rejected (b) Accepted automatically (c) Accepted subject to certain modifications and variations (d) None of the above
In case of unenforceable contract having some technical defect, parties (a) Can sue upon it (b) Cannot sue upon it (c) Should consider it to be illegal (d) None of the above
If entire specified goods is perished before entering into contract of sale, the contract is (a) Valid (b) Void (c) Voidable (d) Cancelled
______________ contracts are also caled contracts with executed consideration. (a) Unilateral (b) Completed (c) Bilateral (d) Executory
A offers B to supply books @ Rs 100 each but B accepts the same with condition of 10% discount. This is a case of (a) Counter Offer (b) Cross Offer (c) Specific Offer (d) General Offer
_____________ is a game of chance. (a) Conditional Contract (b) Contingent Contract (c) Wagering Contract (d) Quasi Contract
There is no binding contract in case of _______ as one's offer cannot be constructed as acceptance (a) Cross Offer (b) Standing Offer (c) Counter Offer (d) Special Offer
An offer is made with an intention to have negotiation from other party. This type of offer is: (a) Invitation to offer (b) Valid offer (c) Voidable (d) None of the above
When an offer is made to the world at large, it is ____________ offer. (a) Counter (b) Special (c) General (d) None of the above
Implied contract even if not in writing or express words is perfectly _______________ if all the conditions are satisfied:- (a) Void (b) Voidable (c) Valid (d) Illegal
A specific offer can be accepted by ___________. (a) Any person (b) Any friend to offeror (c) The person to whom it is made (d) Any friend of offeree
An agreement toput a fire on a person's car is a ______: (a) Legal (b) Voidable (c) Valid (d) Illegal
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