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1.What is analog-to-digital conversion of signals?

A discrete-time signal is defined by specifying its value only at discrete times, called sampling instants. When the sampled values are quantized and encoded, a digital signal is obtained. A digital signal is obtained from the analog signal by using an analog-to-digital converter. This entire process is referred to as the conversion of signals from analog to digital form.

2.What are the properties of ROC for z-Transform?

Properties of the ROC for the z-Transform:

X(z) converges uniformly if and only if the ROC of the z-transform X(z) of the sequence includes the unit circle. The ROC of X(z) consists of a ring in the z-plane centered about the origin. That is, the ROC of the z-transform of x(n) has values of z for which x(n) r-n is absolutely assumable.

  • The ROC does not contain any poles.
  • When x(n) is of finite duration then the ROC is the entire z-plane, except possibly z=0 and/or z=infinity.
  • If x (n) is a right sided sequence, the ROC will not include infinity.
  • If x (n) is a left sided sequence, the ROC will not include z=0. However if x(n)=0 for all n>0, the ROC will include z=0.
  • If x (n) is two sided and if the circle |z| = r0 is in the ROC, then the ROC will consist of a ring in the z-plane that includes the circle |z|=r0.
  • If X (z) is rational, then the ROC extends to infinity, i.e. the ROC is bounded by poles.
  • If x (n) is causal, then the ROC includes z=infinity.
  • If x (n) is anti- causal, then the ROC includes z=0.

3.What are the functions of Base Station System (BSS)?

Functions of BSS are as follows:

  • Radio path control.
  • BTS and TC control.
  • Connection establishment with MS-NSS.
  • Mobility management, speech transcending.
  • Connection of statistical data.

4.What are the parts of Network Management System (NMS)?

Following are the parts of network management system:

  • OMC: Operation and maintenance center – Computerized monitoring center.
  • NMC: Network Management Center – Centralized control of a network is done here.
  • OSS: Operation and support system – Used for supporting activities performed in an OMC and/or NMC.

5.What are applications of DSP?

Some selected applications or digital signal processing that are often encountered in daily life are listed as follows:

  • Telecommunication: Echo cancellation in telephone networks.
  • Military Radar signal processing
  • Consumer electronics Digital Audio/TV
  • Instrumentation and control
  • Image processing image representation, image compression
  • Speech processing speech analysis methods are used in automatic speech recognition
  • Medicine Medical diagnostic instrumentation such as computerized tomography (CT)
  • Seismology DSP techniques are employed in geophysical exploration for oil and gas.
  • Signal Filtering Removal of unwanted background noise.

6.What are the drawbacks of Walsh codes?

Walsh codes have the following drawbacks:

  • The codes do not have a single, narrow auto correlation peak.
  • The spreading is not over the whole bandwidth; instead the energy is spread over a number of discrete frequency components.
  • Although the full sequence cross correlation is identically zero, this does not hold for a partial sequence cross correlation function. Thus advantage of using orthogonal codes is lost.
  • Orthogonality is also affected by channel properties like multi path.

7. Explain radio environment in building.

  • Building penetration: Building penetration depends on the material used for construction and architecture used. This varies building to building and is based on building construction.
  • Building Height Effect: The signal strength is always higher at top floor and generally floor gain height is about 2.7dB/floor which is not dependent on building construction.
  • Building Floor Reception: The signal isolation between floors in a multi floor building is on the average about 20dB. Within a floor of 150 * 150 feet, the propagation loss due to interior walls, depending on the wall materials is about 20 dB between the strong and the weak areas.

8. List some advantages of GSM.

Here are some advantages of GSM:

  • GSM is mature; this maturity means a more stable network with robust features.
  • Less signal deterioration inside buildings.
  • Ability to use repeaters.
  • Talk time is generally higher in GSM phones due to pulse nature of transmission.
  • The availability of Subscriber Identity Modules allows users to switch networks and handset at will.
  • GSM covers virtually all parts of world so international roaming is not a problem.

9. What are the various types of numbers for network identity?

Various types of number for network identity are as follows:

  • MSISDN (Mobile station ISDN) Number: It is international mobile subscriber number which is normally called mobile number. It is unique worldwide.
  • MSRN (Mobile Subscriber Routing Number) : MSRN is used during mobile terminate trunk call to provide location of mobile subscriber.
  • HON (Hand Over Number) : HON is used for providing information required to transfer call from one B?SC to another BSC or to another MSC.
  • ISMI (International Mobile Subscriber Identity Number) : Purpose of ISMI is for location update and authentication.
  • TMSI (Temporary Mobile Subscriber Identity) : TMSI is used instead of IMSI to improve security efficiency of network.
  • IMEI : International Mobile Equipment Identity.

10.What are GPRS services?

GPRS services are defined to fall in one of the two categories:

  • PTP (Point to point)
  • PTM (Point to Multi point)

Some of the GPRS services are not likely to be provided by network operators during early deployment of GPRS due in part to the phased development of standard. Market demand is another factor affecting the decision of operators regarding which services to offer first.

11.What are the advantages of CDMA?

Advantages of CDMA are as follows:

  • Frequency diversity: Transmission is spread out over a large bandwidth due to that less affected by noise. If bandwidth is increased S/N ratio increases, which means noise will be reduced.
  • Multiplication Resistance: Chipping codes used for CDMA not only exhibit low correlation but also low auto correlation. Hence a version of the signal that is delayed by more than one chip interval does not interfere with dominant signal as in other multi path environments.
  • Privacy: Due to spread spectrum is obtained by the use of noise like signals, where each user has a unique code, so privacy is inherent.
  • Graceful Degradation. In CDMA, more users access the system simultaneously as compared to FDMa, TDMA.

12.What are the advantages of spread spectrum?

Spread spectrum has the following advantages:

  • No cross talk interference.
  • Better voice quality/data integrity and less static noise.
  • Lowered susceptibility to multi path fading.
  • Inherent security.
  • Co-existence.
  • Longer operating distances.
  • Hard to detect.
  • Hard to intercept or demodulate.
  • Harder to jam than narrow bands.
  • Use of ranging and radar.

13. Explain the steps involved in demodulating a signal.

Once the signal is coded, modulated and then sent, the receiver must demodulate the signal. This is usually done in two steps: Spectrum spreading (e.g., direct sequence or frequency hopping) modulation is removed.The remaining information bearing signal is demodulated by multiplying with a local reference identical in structure and synchronized with received signal.

14. How can a Pseudo Random Noise Code be usable?

To be usable for direct sequence spreading, a PN code must meet the following conditions:

  • Sequence must be built from 2 leveled numbers.
  • The codes must have sharp auto correlation peak to enable code synchronization.
  • Codes must have a low cross-correlation value, the lower it is, more are the number of users which can be allowed in the system.
  • The codes should be “balanced” i.e. the difference between ones and zeros in code may only be one.

15.What are different categories of antenna and give an example of each?

Different categories of antenna are as follows:

  • Wire Antennas – Short Dipole Antenna
  • Micro strip Antennas – Rectangular Micro strip (Patch) Antennas
  • Reflector Antennas – Corner Reflector
  • Travelling Wave Antennas – Helical Antennas
  • Aperture Antennas – Slot Antenna
  • Other Antennas – NFC Antennas

16.What is handover and what are its types?

Handover in mobile communication refers to the process of transferring a call from one network cell to another without breaking the call. There are two types of handover which are as follows:

  • Hard Handoff: hard handoff is the process in which the cell connection is disconnected from the previous cell before it is made with the new one.
  • Soft Handoff: It is the process in which a new connection is established first before disconnecting the old one. It is thus more efficient and smart.

17. What is ionospheric bending?

When a radio wave travels into the ionospheric layer it experiences refraction due to difference in density. The density of ionospheric layer is rarer than the layer below which causes the radio wave to be bent away from the normal. Also the radio wave experiences a force from the ions in the ionospheric layer. If incident at the correct angle the radio wave is completely reflected back to the inner atmosphere due to total internal reflection. This phenomenon is called ionospheric reflection and is used in mobile communication for radio wave propagation also known as ionospheric bending of radio waves.

18.What is CDMA?

CDMA stands for Code Division Multiple Access which uses digital format. In CDMA systems several transmissions via the radio interface take place simultaneously on the same frequency bandwidth. User data is combined at the transmitter’s side with a code, then transmitted. On air, all transmission get mixed. At the receiver’s side the same code is used as in the transmitter’s side. The code helps the receiver to filter the user information of the transmitter from incoming mixture of all transmissions on the same frequency band and same time.

19.Explain the concept of frequency re-use.

The whole of the geographical area is divided into hexagonal shape geometrical area called cell and each cell having its own transceiver. Each BTS (cell site) allocated different band of frequency or different channel. Each BTS antenna is designed in such a way that i cover cell area in which it is placed with frequency allotted without interfering other sell signal.

20.Explain Bluetooth.

Bluetooth is designed to be a personal area network, where participating entities are mobile and require sporadic communication with others. It is Omni directional i.e. it does not have line of sight limitation like infra red does. Ericsson started the work on Bluetooth and named it after the Danish king Harold Bluetooth. Bluetooth operates in the 2.4 GHz area of spectrum and provides a range of 10 meters. It offers transfer speeds of around 720 Kbps.

These are the questions and answers for Electronics and communication engineering. I have covered all important topics. you can easily crack the interview. Now be prepared with these question and answer in interview.

1. What is Electronic?

The study and use of electrical devices that operate by controlling the flow of electrons or other electrically charged particles.

2. What is communication?

Communication means transferring a signal from the transmitter which passes through a medium then the output is obtained at the receiver. (or)communication says as transferring of message from one place to another place called communication.



3. Different types of communications? Explain.

Analog and digital communication.
As a technology, analog is the process of taking an audio or video signal (the human voice) and translating it into electronic pulses. Digital on the other hand is breaking the signal into a binary format where the audio or video data is represented by a series of "1"s and "0"s.
Digital signals are immune to noise, quality of transmission and reception is good, components used in digital communication can be produced with high precision and power consumption is also very less when compared with analog signals.



4. What is sampling?

The process of obtaining a set of samples from a continuous function of time x(t) is referred to as sampling.



5. State sampling theorem.

It states that, while taking the samples of a continuous signal, it has to be taken care that the sampling rate is equal to or greater than twice the cut off frequency and the minimum sampling rate is known as the Nyquist rate.



6. What is cut-off frequency?

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



7. What is pass band?

Passband is the range of frequencies or wavelengths that can pass through a filter without being attenuated.



8. What is stop band?

A stopband is a band of frequencies, between specified limits, in which a circuit, such as a filter or telephone circuit, does not let signals through, or the attenuation is above the required stopband attenuation level.



9. Explain RF?

Radio frequency (RF) is a frequency or rate of oscillation within the range of about 3 Hz to 300 GHz. This range corresponds to frequency of alternating current electrical signals used to produce and detect radio waves. Since most of this range is beyond the vibration rate that most mechanical systems can respond to, RF usually refers to oscillations in electrical circuits or electromagnetic radiation.



10. What is modulation? And where it is utilized?

Modulation is the process of varying some characteristic of a periodic wave with an external signals.
Radio communication superimposes this information bearing signal onto a carrier signal.
These high frequency carrier signals can be transmitted over the air easily and are capable of travelling long distances.
The characteristics (amplitude, frequency, or phase) of the carrier signal are varied in accordance with the information bearing signal.
Modulation is utilized to send an information bearing signal over long distances.



11. What is demodulation?

Demodulation is the act of removing the modulation from an analog signal to get the original baseband signal back. Demodulating is necessary because the receiver system receives a modulated signal with specific characteristics and it needs to turn it to base-band.



12. Name the modulation techniques.

For Analog modulation--AM, SSB, FM, PM and SM
Digital modulation--OOK, FSK, ASK, Psk, QAM, MSK, CPM, PPM, TCM, OFDM



13. Explain AM and FM.

AM-Amplitude modulation is a type of modulation where the amplitude of the carrier signal is varied in accordance with the information bearing signal.
FM-Frequency modulation is a type of modulation where the frequency of the carrier signal is varied in accordance with the information bearing signal.



14. Where do we use AM and FM?

AM is used for video signals for example TV. Ranges from 535 to 1705 kHz.
FM is used for audio signals for example Radio. Ranges from 88 to 108 MHz.



15. What is a base station?

Base station is a radio receiver/transmitter that serves as the hub of the local wireless network, and may also be the gateway between a wired network and the wireless network.



16. How many satellites are required to cover the earth?

3 satellites are required to cover the entire earth, which is placed at 120 degree to each other. The life span of the satellite is about 15 years.



17. What is a repeater?

A repeater is an electronic device that receives a signal and retransmits it at a higher level and/or higher power, or onto the other side of an obstruction, so that the signal can cover longer distances without degradation.

18. What is an Amplifier?

An electronic device or electrical circuit that is used to boost (amplify) the power, voltage or current of an applied signal.



19. Example for negative feedback and positive feedback?

Example for ?ve feedback is ---Amplifiers And for +ve feedback is ? Oscillators



20. What is Oscillator?

An oscillator is a circuit that creates a waveform output from a direct current input. The two main types of oscillator are harmonic and relaxation. The harmonic oscillators have smooth curved waveforms, while relaxation oscillators have waveforms with sharp changes.



21. What is an Integrated Circuit?

An integrated circuit (IC), also called a microchip, is an electronic circuit etched onto a silicon chip. Their main advantages are low cost, low power, high performance, and very small size.



22. What is crosstalk?

Crosstalk is a form of interference caused by signals in nearby conductors. The most common example is hearing an unwanted conversation on the telephone. Crosstalk can also occur in radios, televisions, networking equipment, and even electric guitars.



23. What is resistor?

A resistor is a two-terminal electronic component that opposes an electric current by producing a voltage drop between its terminals in proportion to the current, that is, in accordance with Ohm's law:
V = IR.



25. What is inductor?
An inductor is a passive electrical device employed in electrical circuits for its property of inductance. An inductor can take many forms.



26. What is conductor?

A substance, body, or device that readily conducts heat, electricity, sound, etc. Copper is a good conductor of electricity.



27. What is a semi conductor?

A semiconductor is a solid material that has electrical conductivity in between that of a conductor and that of an insulator(An Insulator is a material that resists the flow of electric current. It is an object intended to support or separate electrical conductors without passing current through itself); it can vary over that wide range either permanently or dynamically.



28. What is diode?

In electronics, a diode is a two-terminal device. Diodes have two active electrodes between which the signal of interest may flow, and most are used for their unidirectional current property.



29. What is transistor?

In electronics, a transistor is a semiconductor device commonly used to amplify or switch electronic signals. The transistor is the fundamental building block of computers, and all other modern electronic devices. Some transistors are packaged individually but most are found in integrated circuits



30. What is op-amp?

An operational amplifier, often called an op-amp , is a DC-coupled high-gain electronic voltage amplifier with differential inputs[1] and, usually, a single output. Typically the output of the op-amp is controlled either by negative feedback, which largely determines the magnitude of its output voltage gain, or by positive feedback, which facilitates regenerative gain and oscillation.



31. What is a feedback?

Feedback is a process whereby some proportion of the output signal of a system is passed (fed back) to the input. This is often used to control the dynamic behaviour of the system.



32. Advantages of negative feedback over positive feedback.

Much attention has been given by researchers to negative feedback processes, because negative feedback processes lead systems towards equilibrium states. Positive feedback reinforces a given tendency of a system and can lead a system away from equilibrium states, possibly causing quite unexpected results.



33. What is Barkhausen criteria?

Barkhausen criteria, without which you will not know which conditions, are to be satisfied for oscillations.
?Oscillations will not be sustained if, at the oscillator frequency, the magnitude of the product of the
transfer gain of the amplifier and the magnitude of the feedback factor of the feedback network ( the magnitude of the loop gain ) are less than unity?.
The condition of unity loop gain -A? = 1 is called the Barkhausen criterion. This condition implies that
A?= 1and that the phase of - A? is zero.



34. What is CDMA, TDMA, FDMA?

Code division multiple access (CDMA) is a channel access method utilized by various radio communication technologies. CDMA employs spread-spectrum technology and a special coding scheme (where each transmitter is assigned a code) to allow multiple users to be multiplexed over the same physical channel. By contrast, time division multiple access (TDMA) divides access by time, while frequency-division multiple access (FDMA) divides it by frequency.
An analogy to the problem of multiple access is a room (channel) in which people wish to communicate with each other. To avoid confusion, people could take turns speaking (time division), speak at different pitches (frequency division), or speak in different directions (spatial division). In CDMA, they would speak different languages. People speaking the same language can understand each other, but not other people. Similarly, in radio CDMA, each group of users is given a shared code. Many codes occupy the same channel, but only users associated with a particular code can understand each other.



35. explain different types of feedback

Types of feedback:
Negative feedback: This tends to reduce output (but in amplifiers, stabilizes and linearizes operation). Negative feedback feeds part of a system's output, inverted, into the system's input; generally with the result that fluctuations are attenuated.
Positive feedback: This tends to increase output. Positive feedback, sometimes referred to as "cumulative causation", is a feedback loop system in which the system responds to perturbation (A perturbation means a system, is an alteration of function, induced by external or internal mechanisms) in the same direction as the perturbation. In contrast, a system that responds to the perturbation in the opposite direction is called a negative feedback system.
Bipolar feedback: which can either increase or decrease output.



36. What are the main divisions of power system?

The generating system,transmission system,and distribution system



37. What is Instrumentation Amplifier (IA) and what are all the advantages?

An instrumentation amplifier is a differential op-amp circuit providing high input impedances with ease of gain adjustment by varying a single resistor.



38. What is meant by impedance diagram.

The equivalent circuit of all the components of the power system are drawn and they are interconnected is called impedance diagram.



39. What is the need for load flow study.
The load flow study of a power system is essential to decide the best operation existing system and for planning the future expansion of the system. It is also essential for designing the power system.



40. What is the need for base values?

The components of power system may operate at different voltage and power levels. It will be convenient for analysis of power system if the voltage, power, current ratings of the components of the power system is expressed with referance to a common value called base value.

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