Assignment No: 01 Subject: Microwaves and Antennas Subject Code: 15EC71 Name of the faculty: Raghu B R Semester: VII (A and B)

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1 DAYANANDA SAGAR ACADEMY OF TECHNOLOGY AND MANAGEMENT (Affiliated to Visvesvaraya Technological University, Belagavi & Approved by AICTE, New Delhi) Udayapura, Opp. Art of living, Kanakapura Road, Bangalore Assignment No: 01 Subject: Microwaves and Antennas Subject Code: 15EC71 Name of the faculty: Raghu B R Semester: VII (A and B) 1. Why can t conventional tubes used at microwave frequencies?. Explain operating principle of Reflex klystron. (08M) 2. Explain the mechanism of oscillation in reflex klystron oscillator. (08M) 3. Explain the followings with necessary equation regarding Reflex klystron: a. Mode number b. Velocity modulation c. Transit time d. Power output and efficiency (08M) 4. Explain Mode curve with waves and also derive the equations for frequency and changing repeller voltage. (08M) 5. Derive the transmission line equation by the method of distributed circuit theory. (Dec Marks)(8M) 6. Define reflection coefficient. Derive the equation for reflection coefficient at the load end and at a distance d from load end, starting from equation for Zl. (8M) 7. What are standing waves? Draw the standing wave pattern for: i) Open circuit termination ii) short circuit termination iii) Matched termination (Dec 08/Jan09 10 Marks,Dec Marks) (8M) 8. a. What are the applications of smith chart? Explain briefly. b. The characteristic impedance of the line is 50Ω and SWR 2, when the line is loaded. When the line is shorted the minimum shifts 0.15 towards load. Determine the load impedance. Use smith chart. (Dec 09/Jan10 05 M) (8M) 9. What is impedance matching? Explain single stub matching. (June/July 2014,,July Marks 08) 10. a. Explain S-matrix representation of multiport network. (Dec 2012,June M) b. Which properties are common in S, Z and Y matrices? (Dec 09/Jan10 05 M) Signature of the faculty Signature of the HOD

2 DAYANANDA SAGAR ACADEMY OF TECHNOLOGY & MANAGEMENT (Affiliated to Visvesvaraya Technological University, Belagavi and Approved by AICTE, New Delhi) Opp. Art of Living, Udayapura, Kanakapura Road, Bangalore Assignment 01 Subject: DIGITAL IMAGE PROCESSING Subject code: 15EC72 Class: VII semester A & B sec Faculty Name: Dr. RMP & KN 1a. What is digital image processing? Explain the fundamental steps in digital image processing. (June/July Marks) 1b. Mention the applications of image processing. (Dec.2016/Jan Marks) 2. With a neat block diagram, describe various components used in general purpose image processing system. (June/July Marks) 3a. Explain the process of image acquisition, using sensor strips and sensor arrays. (Dec.2014/Jan Marks) 3b. How many minutes would it take to transmit a 512 x 512 image with 256 gray levels using 300 k baud modern? (Baud rate is the number of bits transmitted per second. Assume each byte is one packet with a start bit and a stop bit.) (Dec.2014/Jan Marks) 4. Explain the following terms: i) Adjacency; ii) Connectivity; iii) Gray level resolution; iv) Spatial resolution; v) Neighbour of pixel (June/July Marks) 5 a. Explain the zooming of digital image. (Dec.2011/Jan Marks) 5 b. Consider the image segment shown in fig. i) Let V = {0, 1}. Compute the lengths of shortest 4 -, 8- and m- paths between p and q. ii) Repeat for V = {1, 2}. (Dec.2016/Jan Marks) (q) (p) Explain the basic concept of spatial filtering in image enhancement and hence explain the importance of smoothing filters and median filters. (Dec.2009/Jan Marks) 7a. Using the second derivative, develop a Laplacian mask for image sharpening. (Dec.2013/Jan Marks)

3 7b. Briefly explain how arithmetic and logic operations are used for image enhancement. (Dec.2012/Jan Marks) 8. Explain the following with applications: i) Contrast stretching ii) Bit plane slicing iii) Gray-level slicing iv) AND operation v) OR operation. (June/July Marks) 9. Perform histogram equalization for the following image data, Fig. in below. Sketch the histogram of the original image and histogram of equalized image. (Dec.2015/Jan Marks) Gray value Number of pixels (nk) For the given 4x4 image having gray scale between [0,9], get histogram equalized image and draw the histogram of image before and after equalization (Dec.2014/Jan Marks) Signature of the faculty members Signature of the HOD

4 DAYANANDA SAGAR ACADEMY OF TECHNOLOGY AND MANAGEMENT (Affiliated to Visvesvaraya Technological University, Belagavi & Approved by AICTE, New Delhi) Udayapura, Opp. Art of living, Kanakapura Road, Bangalore Assignment I Subject Code: 15EC73 Name of the faculty: Asha Rani A.R Subject: Power Electronics Semester: VII th A & B SEC 1. a. Mention and explain the different types of power electronic converter systems. Draw their input and output characteristics and mention the applications of each type(june /july marks) 2. Give the symbol, characteristic features of the following power devices: i) SCR ii) TRIAC iii)lascr iv)mct V)SITH vi)gto vii)mosfet Viii)DIAC (June /july marks) 3.What is power electronics? Give applications of power electronics along with advantages and disadvantages. (June /july marks) 4. With the circuit diagram, input and output waveforms, explain the control characteristics of a. SCR b. GTO and SITH c. MCT d. MOSFET and IGBT e. BJT (may/june marks) 5.a Explain the peripheral effects of power converter systems? what are the remedies for them? (June /july marks) 5. b. Compare BJT,MOSFET and IGBT s (dec/jan marks) (June /july marks) (december2012, Dec marks) 6. a.the beta(β) bipolar transistor shown in fig varies from 12to 75,the load resistance Rc=1.2Ω.the dc supply voltage is Vcc=40V and input voltage to the base circuit V B =6V,if Vce (sat) =1.2V, Vbe (sat) =1.6V,Rb=0.7Ω determine (may/june2010 5marks) a. i)overdrive factor(odf) b. ii)the forced β and c. iii)the power loss in the transistor Pt

5 b. What are pinch off voltage, threshold voltage and transconductance of MOSFET? (december marks) 7. With the necessary waveforms, explain the switching characteristics of power transistors (june marks)(december marks)(dec/jan marks) 8.a. State and explain output and transient characteristics of enhancement type MOSFET (June /july marks) b.. write a short note on di/dt and dv/dt limitations (05marks) 9. Draw the two transistor model of a thyristor and derive an expression for the anode current in terms of the common base gain α1 and α2 of the transistors also explain the process of regeneration cycle./using a two transistor model of thyristor show that (december marks) (december marks) (dec/jan marks) (june marks) (june/july marks) 10. a. What is the difference between SCR and TRIAC? explain its characteristics (december marks)/july marks) b. Define the following term with respect to SCR: i)latching current ii)holding current iii)turn on time iv)turnoff time (may/june marks) Signature of the Faculty Signature of the HOD Signature of the Principal

6 DAYANANDA SAGAR ACADEMY OF TECHNOLOGY AND MANAGEMENT (Affiliated to Visvesvaraya Technological University, Belagavi & Approved by AICTE, New Delhi) Udayapura, Opp. Art of living, Kanakapura Road, Bangalore Assignment I Subject: Multimedia Communications Subject code: 15EC741 Class: VII Sem ECE A & B Faculty: Dr. Madhumathy P 1. a. Explain multimedia data networks. (Jun Marks) 1. b. Derive the maximum block size that should be used over a channel which has mean BER probability of 10-4 if the probability of a block containing on error and hence being discarded is to be (Jun Marks, Dec Marks) 2. a. Determine the propagation delay associated with the following communication channels: i) a connection through a private telephone network of 1 km. ii) a connection through a PSTN of 200 km. iii) a connection over satellite channel of km. Assume that the velocity of propagation of a signal in the case of. i) and ii) is 2x10 8 ms -1 and in case of iii) 3x10 8 ms -1. (Jun 13/ Marks) 2. b. Define the term multimedia communication. State the basis of representing different media types. (Dec Marks) 3. a. Briefly explain the following operational modes of a communication channel: i) Duplex; ii) Multicast. (Jun Marks) 3. b. Identify and explain the meaning of the key QOS parameters associated with i) Circuit switching ii) Packet switching (Dec Marks) 4. With neat diagram explain different types of multimedia network (Jun Marks) 5. With the help of a diagram, describe the main components of PSTN and show how a high speed modem provides multiple services in addition to basic telephony. (Jun 10, Jun Marks)

7 6. Explain the principle of operation of PCM speech codec with a block diagram. Also explain compressor and expander. (Jun Marks) 7. a. Describe raster scan operation associated with TV / computer monitor. (Dec Marks, Jun Marks) b Assuming the bandwidth of speech signal is from 50 Hz through 10 khz and that of music signal is from 15 Hz through to 20 khz. Derive the bit rate that is generated by the digitization procedure in each case assuming the Nyquist sampling rate is used with 12 bits/sample for speech signal and 16 bits/sample for music signal. Derive the memory required to store 10 minutes passage of stereophonic music. (Dec 10, Jun Marks, Jun Marks) 8. With the aid of diagrams, describe the following digitization formats, i) 4 : 2 : 2 ii) QCIF. For each format, state the temporal resolution. Spatial resolution, bit rate and give an example application for each format. (Jun 10, Jun Marks) 9. With the aid of a diagram, explain color image capture using camera and also RGB signal generation methods for above (Jun Marks) 10. Encode the string went. Comprising characters with probabilities of e = 0.3, n = 0.3, t= 0.2, w = 0.1, 0=0.1 using arithmetic coding. (Jun Marks) Signature of HOD Signature of Faculty

9 DAYANANDA SAGAR ACADEMY OF TECHNOLOGY AND MANAGEMENT (Affiliated to Visvesvaraya Technological University, Belagavi & Approved by AICTE, New Delhi) Udayapura, Opp. Art of living, Kanakapura Road, Bangalore Assignment No: 01 Subject: IoT and Wireless Sensor Networks Subject Code: 15EC752 Semester: VII ECE (A Sec and B Sec) 1a. What is Internet of Things (IoT)? What are the roles of things and Internet in IoT? 04 Marks 1b. What are the main challenges of Internet of Things (IoT)? 04 Marks 2a. Explain M2M communication in IoT devices? 04 Marks 2b. What are the differences between IoT and M2M communication? 04 Marks 3a. Explain with a block diagram the functional blocks of an IoT device? 04 Marks 3b. Explain in detail key technologies for Internet of Things? 04 Marks 4. Explain in detail IoT Architecture with a neat diagram? 08 Marks 5. Explain with a diagram the protocols used in different layers of IoT device? 08 Marks 6a. Explain in detail RFID technology with a neat diagram? 04 Marks 6b. What are the important Components of IoT System? 04 Marks 7. Explain in detail the various communication models of IoT systems? 08 Marks 8. Explain in detail the message communication protocols MQTT, CoAP and XMPP for IoT/M2M devices? 08 Marks 9. Explain in detail the advantages and disadvantages of IoT? 08 Marks 08. Explain in detail the various applications of IoT? 08 Marks Signature of Faculty Signature of HOD 1

DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING QUESTION BANK

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