Electronics and Communication Engineering Interview Questions and Answers 2022

Electronics and Communications Engineering (ECE) mainly involves designing, researching, developing, and testing electronic equipment utilized in various systems. The Electronics and Communications engineers even oversee and conceptualize the manufacturing of broadcast and communications systems.

This engineering stream deals with basic electronics, analog transmission, microprocessors, digital and analog communication, solid-state devices, analog integrated circuits, satellite communication, microwave engineering, antennae, and wave progression. The ECE branch also deals with the manufacturing of electronic circuits, devices, and another communications equipment.

If you are good at electronics communication and circuits, ECE is a great choice. This blog covered the top 50 interview questions for both freshers and experienced Electronics and Communication Engineering graduates.

Top Electronics and Communication Engineering Interview Questions and Answers 2022

Below is a list of 50 interview questions for Electronics and Communication Engineering that have been divided on the basis of freshers and experienced graduates.

A) Electronics and Communication Engineering Interview Questions and Answers for Freshers

Here are the top 25 interview questions and answers for Electronics and Communication Engineering freshers’ candidates.

1. What is Electronic?

Ans- The study and utilization of electrical devices which operate by controlling the electron’s flow or other electrically charged particles.

2. What is communication?

Ans- Communication means signal transfer from the transmitter that passes through a medium; then, the output is obtained at the receiver.

3. What are the two types of communications?

Ans- Analog and digital communication.

4. What is sampling?

Ans- The process of obtaining a sample set from a continuous function of time x(t) is known as sampling.

5. State the sampling theorem

Ans- The sampling theorem states that, while taking the samples of a signal, it has to be taken specific care that the sampling rate is equal to or greater than the cut-off frequency along with the minimum sampling rate.

6. What is the cut-off frequency?

Ans- The frequency at which the response is within -3dB with respect to the maximum response.

7. What is the passband?

Ans- The passband is a range of wavelengths or frequencies that can pass through a filter without being attenuated.

8. What is a stop band?

Ans- A stopband is a band of frequencies happening between specified limits, where a circuit, like a filter or a telephone circuit, does not allow the signals to pass through.

9. Explain RF?

Ans- RF is a Radiofrequency which is a rate or frequency of oscillation within the range of about 3 Hz to 300 GHz.

10. What is modulation?

Ans- Modulation is the procedure of varying a few characteristics of a periodic wave with external signals.

11. What is demodulation?

Ans- Demodulation is a procedure of removing the modulation from a particular analog signal to get the original baseband signal back.

12. Name the modulation techniques.

Ans- For Analog modulation, the techniques are known as AM, SSB, FM, PM, and SM, and for Digital modulation, the techniques include OOK, FSK, ASK, Psk, QAM, MSK, CPM, PPM, TCM, and OFDM.

13. Explain AM and FM.

Ans- AM, also known as the Amplitude modulation, is a modulation type where the amplitude of the carrier signal is varied in compliance with the information-bearing signal.
FM, also known as the Frequency modulation, is a modulation type where the frequency of the carrier signal is varied in compliance with the information-bearing signal.

14. Where do we use AM and FM?

Ans- AM is utilized for video signals, for example, TV, and ranges from 535 to 1705 kHz. While FM is utilized for audio signals, for example, Radio. This ranges from 88 to 108 MHz.

15. What is a base station?

Ans- A base station is a radio transmitter or receiver that serves as the hub of the local wireless network. It might also be the gateway between the wired networks.

16. What is a diode?

Ans- A diode is a two-terminal device. It has two active electrodes in between which the interest signals may flow, and most are utilized for their unidirectional current property.

17. What is a repeater?

Ans- A repeater is a kind of electronic device that receives a signal and retransmits it at a higher level so that signals can easily cover longer distances without much degradation.

18. What is an Amplifier?

Ans- An Amplifier is an electrical circuit or electronic device that is utilized for boosting or amplifying the power, current, or voltage of an applied signal.

19. Example for negative feedback and positive feedback?

Ans- An example of negative feedback is Amplifiers, and positive feedback is Oscillators.

20. What is Oscillator?

Ans- An oscillator is a kind of circuit that creates a waveform output directly from the current input. The two main types of oscillators are relaxation and harmonic.

21. What is an Integrated Circuit (IC)?

Ans- An integrated circuit (IC), also known as a microchip, is a kind of electronic circuit that is etched onto a silicon chip. The main benefits of IC are that it is low power, low cost, high performance, and very small size.

22. What is crosstalk?

Ans- Crosstalk is a type of interference that is caused by signals in the nearby conductors. The most common type of example hears an unwanted conversation over the telephone.

23. What is a resistor?

Ans- A resistor is a type of two-terminal electronic component which opposes an electric current through the production of a voltage drop in between its terminals; in proportion to the current, which is in accordance with the Ohm’s law:
V = IR.

25. What is an inductor?

Ans- An inductor is a type of passive electrical device that is employed in electrical circuits for its property of inductance. This inductor can take several forms.

Also read: Future Scope of Electronics and Communication Engineering in India

B) Electronics and Communication Engineering Interview Questions and Answers for Experienced

Here are the top 25 interview questions and answers for Electronics and Communication Engineering experienced candidates.

1. What is Capacitor?

Ans- A capacitor is an electronic or electrical device that can store energy in the electric field between plates, also known as a pair of conductors.

2. What is a Rectifier?

Ans- A rectifier changes the alternating current into a direct current. This procedure is known as rectification. The three main types of rectifiers are the full­wave, half­wave, and bridge.

3. What is Multiplexing?

Ans- Multiplexing, also known as muxing, is referred to as a process where the multiple analog message signals or digital data streams come together into one particular signal over a shared medium.

4. What are the three main divisions of the power system?

Ans- The three main divisions of the power system include the transmission system, generating system, and distribution system.

5. What is an Instrumentation Amplifier (IA)?

Ans- An instrumentation amplifier or IA is a differential op-amp circuit that provides high input impedances with the ease of gain adjustment by varying a single resistor.

6. What do you understand about the impedance diagram?

Ans- The equivalent circuit of various components of the power system is drawn and interconnected. This is known as the impedance diagram.

7. What is the requirement for the load flow study?

Ans- The load flow study of a particular power system is crucial to deciding the best operation existing system. It is also needed for designing the power system.

8. What is the requirement for base values?

Ans- The power system components may operate at various voltage and power levels. It will be convenient for analysis of the power system if the voltage and current ratings are expressed with reference to the common value known as the base value.

9. What is Power Rating?

Ans- The power rating of a diode is mainly defined as the maximum value of power that can be easily dissipated without failure, which means Pd= V f x I f.

10. What is a rheostat?

Ans- A rheostat is a variable resistor that is utilized to control the flow of electric current by manually decreasing or increasing its resistance.

11. What do you mean by demodulation?

Ans- Demodulation is the act of modulation removal from an analog signal to receive the original baseband signal back.

12. What are GPRS services?

Ans- GPRS services are mainly defined to fall into one of the two categories:
PTP (Point to point) and PTM (Point to Multipoint)

13. What is op-amp?

Ans- An op-amp, also known as the operational amplifier, is a DC-coupled high-gain electronic voltage amplifier with various differential inputs.

14. What is a Photodiode?

Ans- A photodiode is made specifically to detect light quickly in a solar cell for the collection of energy from light. They are both silicon diodes but modified to meet their various requirements.

15. What is a solar cell?

Ans- A solar cell, also known as the photovoltaic cell, is a type of electrical device which converts the energy of light directly into electricity through the photovoltaic effect, which is a chemical and physical phenomenon.

16. How do you make a memory card for a mobile phone?

Ans- A memory chip stores bits and is mounted on a card with electrical contacts so that the computer or camera can send the data that needs to be stored.

17. What is handover?

Ans- Handover in mobile communication mainly refers to the process of call transfer from one network cell to another without disrupting the call.

18. What is CDMA?

Ans- CDMA, also known as the Code Division Multiple Access, is mainly known for utilizing the digital format.

19. Explain the concept of frequency reuse?

Ans- Frequency reuse is a technique for utilizing a specified range of frequencies more than once in the radio system so that the system’s total capacity is increased without increasing the allocated bandwidth.

20. Explain Bluetooth?

Ans- Bluetooth is mainly designed to be a personal area network, where the participating entities are mobile, which requires sporadic communication with others. It is Omnidirectional, i.e., it does not have a line of sight limitation like the infrared does.

21. What are the functions of the base station system (BSS)?

Ans- The functions of BSS are as follows:
● BTS and TC control.
● Radio path control.
● Connection establishment with MS-NSS.

22. What is an analog-to-digital conversion of signals?

Ans- Analog-to-digital conversion of signals is defined by the specification of its value only at discrete times, known as sampling instants.

23. What is the main difference between latches and flip flops?

Ans- Flip flops have clock signals, while latches don’t need any kind of clock pulse.

24. What is the difference between voltage and potential?

Ans- A Voltage is referred to as the potential difference between the two points, whereas potential means its force.

25. What is the effect of threshold value on transmission power increased or decreased in telecommunication?

Ans- When the transmission power increases the sensitivity of the antenna, the threshold increases or decreases.

Final Thoughts

Getting a dream job after completing BTech or Mtech in ECE may seem difficult before, but if you are steadfast enough in achieving your goal, then you will definitely get your dream job. Whether you are applying for a government or private job, it is extremely vital to check the website of the potential employees to understand the job responsibilities, skill requirements, and other additional insights about the vacant positions.

Also read: 10 Fantastic Jobs Where An ECE Engineer Will Boost Your Career

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