Electronics 2: Previous Year Questions & Answers

 Chapter 1: Introduction to electronic communication

1 mark

--Q. State Nyquist Sampling Theorem.

Q. Compare synchronous and asynchronous transmission.

2 mark

Q. Explain following terms w.r.t communication system:

1- Channel Bandwidth

-2- Signal to Noise Ratio

Q. A receiver has an input signal power of 1.0 mW. The noise power is 0.35 mW. Calculate the signal to noise ratio.

5mark

--Q. Draw and explain the block diagram of electronic communication system.

Q. How can communication systems be classified according to mode of transmission ? Explain in detail with diagrams and example.

Chapter 2: Information Theory

-Q. Construct hamming code for data information 1001 with odd parity.

0110 with even parity.

1011 with even parity.

Q. What are error correcting codes in communication.

Q. Why is error coding required in communication system? Explain steps involved in constructing hamming code.

-Q. Define baud rate with respect to communication system.

Q. Define data rate.

Chapter 3: Modulation and Demodulation

1 mark

-Q. Give any two examples of half duplex communication system.

-Q. Define simplex communication system and give one example.

-Q. Draw waveform of FSK for ,10101100,110011

Q. Draw waveform of ASK for data 101010, 11010110.

Q. Draw frequency spectrum of AM.

Q. What is broadband signal.

Q. What is base band signal?

Q. Give any two advantages of FM over AM.

Q. Draw constellation diagram of QPSK.

5 mark

-Q. Differentiate between AM and FM with respect to any five points.

-Q. Explain FSK modem with help of block diagram.

Q. With neat block diagram explain PAM

Q. With help of diagram, explain PCM modulator and demodulator.

Q. Explaub QPSK with respect to the following points:

-1. Concept

-2. Truth table

-3. Phasor Diagram

-Q. Explain steps involved in PCM and give any two applications of it.Demerits of it.

Chapter 4: Multiplexing and spread spectrum 

5 mark

-Q. Describe basic concept of TDM with help of block diagram.

Q. Differentiate between TDM and FDM.

Q. Explain FDM transmitter with neat block diagram.

-Q. Write any five features of TDMA.

Chapter 5: Media Access Control

Q. What do you mean by multiple access.

5 mark

-Q. Write any five features of CDMA.

--Q. Write any five featrues of FDMA.

Q. Comment on “Guard band is essential in FDMA”.

Chapter 6: Introduction to Computer Networks

Chapter 7: Network Devices

Chapter 8: Ethernet 

Chapter 9: Computer network models

Q. Explain working principle.

Q. Explain FHSS with neat block diagram.

Q. Define hop time with reference to FHSS.

-Q. Define dwell time wrt FHSS technology.

-Q. Give full form of GPRS. features of GPRS.

Q. Explain working principle of an antenna with neat suitable diagrams.

Q. Define Parameters of antenna.

Q. Draw radiation pattern of omnidirectional antenna.

--Q. Define radiation pattern of an antenna. 

Q. In FDM telephony system, how many subscribers can be combined in basic group ?

2 mark

Q. Explain GPRS architecture with block diagram.

---Q. Calculate modulation index, explain modulation index.

Q. Draw circuit diagram of transistorized amplitude modulator and explain its working.

Q. Explain CDM system with block diagram.

--Q. What are different elements of RFID system?

Q. What is an active RFID tag?

--Q. What is delta modulation. and delta modulator. advantages of it.

Q. How many voice channels are multiplexed in a master group?

5mark

Q. Explain bluetooth protocol architecture in detail.

-Q. Give full form. Explain working principle of DSSS.

Q. Explain working of diode modulator for AM.

Q. Obtain output expession for AM mathematically, draw frequency spectrum of AM.

Q. Draw and explain working of GSM architecture.

What do you mean by MTSO in GSM system.

Full form of GSM.

Q. Explain need of wireless communication.

Q. Explain the piconet and scatternet in bluetooth network.

-Q. Give any three features of spread spectrum technology.

--Q. What is hand off concept of mobile communication?

-Q.communication systems be classified according to mode of transmission ? Explain in detail with diagrams and example..