Electronics Communications interview questions and answers - part 2


Electronics Communications interview questions and answers - part 2

Part 1   Part 2   Part 3   Part 4   Part 5   Part 6

7. What are GPRS services?

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

- PTP ( Point to point)
- PTM ( Point to Multipoint)
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.

8. What are the advantages of CDMA?

Advantages of CDMa are as follows :

1. 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.
2. Multiplication Resistance : Chipping codes used for CDMA not only exhibit low correlation but also low autocorrelation. Hence a version of the signal that is delayed by more than one chip interval does not interfere with dominant signal as in other multipath environments.
3. 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.
4. Graceful Degradation. In CDMA, more users access the system simultaneously as compared to FDMa, TDMA.

9. What are the advantages of spread spectrum?

SPread spectrum has the following advantages :

1. No crosstalk interference.
2. Better voice quality/data integrity and less static noise.
3. Lowered susceptibility to multipath fading.
4. Inherent security.
5. Co-existence.
6. Longer operating distances.
7. Hard to detect.
8. Hard to intercept or demodulate.
9. Harder to jam than narrow bands.
10. Use of ranging and radar.

10. 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 :
1. Spectrum spreading (e.g., direct sequence or frequency hopping) modulation is removed.
2. The remaining information bearing signal is demodulated by multiplying with a local reference identical in structure and synchronised with received signal.

11. How can a Pseudo Random Noise COde be usable?

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

1. Sequence must be built from 2 levelled numbers.
2. The codes must have sharp autocorrelation peak to enable code synchronization.
3. 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.
4. The codes should be “balanced” i.e. the difference between ones and zeros in code may only be 1.

Part 1   Part 2   Part 3   Part 4   Part 5   Part 6

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technical questions for ece

sir i hve interview on friday so i need technical interview questions so can you please send me technical questions in basics of electronics ece then it will be useful for me.

Thank you

lokesh bm 09-19-2018 07:17 AM


Sir interview questions regarding communication purpose

Karthik 09-11-2018 08:49 PM

electronic engineering releted interview questions

Dear sir
Please send to electronic engg interview topic

sunil kumar 09-6-2016 10:06 AM

mobile communication

I need topics related to mobile communication.

angelin 08-4-2016 01:34 PM

basics of electronics

Am a 2015 B.E(ECE) passed out student.next month i have a technical interview in TCS so can you please send me technical questions in basics of electronics then it will be useful for me.

Thank you

sabitha pr 07-17-2016 09:52 AM


I want electrical question in my mail for my first interview

Shahabuddin 05-14-2016 12:28 PM


sir,please send interview questions to my mail

SHABREEN 03-26-2016 07:05 AM

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it is helpful.

SHABREEN 03-26-2016 07:01 AM

To get interview question based on ECE

Hello sir,
I need ece related interview question already asked in TCS

Jayapriya Mayilsamy 03-11-2016 04:11 AM


sr i need vadio interview

ashiq ali 11-19-2015 02:12 AM

engineering services interview for elelctronics telecommunication

pls send analog interview questions

anshul 09-27-2015 11:55 AM


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