Enroll. No. _____________

SILVER OAK COLLEGE OF ENGINEERING & TECHNOLOGY BE - SEMESTER–VII• MID SEMESTER-I EXAMINATION – WINTER 2017

SUBJECT: MICROWAVE ENGINEERING (2171001) (EC) DATE: 06/08/2018 TIME: 10:00 pm to 11:30 pm TOTAL MARKS: 40

Instructions: 1. All the questions are compulsory. 2. Figures to the right indicate full marks 3. Assume suitable data if required.

Q.1 (a) Explain in brief standing wave and reflection coefficient. Write the significance

of Standing Wave ratio (SWR). Also, obtain the expression of reflection

coefficient at any point on the line.

[05]

(b) Derive necessary equations for attenuation constant and phase constant with

reference to EM wave propagating along transmission line.

[05]

Q.2 (a) Derive the equivalent circuit of two wire parallel transmission line and derive

necessary equations (Voltage & Current) for same.

[06]

(b) Write a short note on Advantages and Disadvantages.

1. Coplanar line. 2. Slot line.

[05]

(c) Why TEM wave cannot propagate through rectangular waveguide? [04]

OR

Q.2 (a) What is impedance matching? Explain impedance matching using single stub. [06]

(b) Write a short note on 1) Half Wavelength transmission line and 2) Quarter

Wavelength transmission line.

[05]

(c) Explain advantages of Microwave signal. [04]

Q.3 (a) Determine the cutoff wavelength for the dominant mode in a rectangular

waveguide of breadth 10 cms. For a 2.5 GHz signal propagated in this

waveguide in the dominant mode, calculate the guide wavelength, the group

velocity and the phase velocity.

[06]

(b) Explain the operation of Magic TEE with its S-parameters. Also list some

applications of magic TEE.

[05]

(c) Differentiate transmission line and waveguide. [04]

OR

Q.3 (a) The dimension of a waveguide is 2.5 X 1cms. The frequency is 8.6 GHz. Find

the possible modes that can propagate through the waveguide. Also find the

cutoff frequencies for the same.

[06]

(b) Explain the operation of E-plane Tee and obtain Scattering matrix for the

same.

[05]

(c) Why TE 10 is the dominant mode for rectangular waveguide? [04]

Enroll. No. _____________

SILVER OAK COLLEGE OF ENGINEERING & TECHNOLOGY

BE – SEMESTER–VII • MID SEMESTER-IEXAMINATION – WINTER 2018

SUBJECT: Digital Signal Processing(2171003) (EC)

DATE: 07-08-2018 TIME: 10:00 am to 11:30 am TOTAL MARKS: 40

Instructions: 1. All the questions are compulsory. 2. Figures to the right indicate full marks. 3. Assume suitable data if required.

Q.1 (a) With the help of block diagram explain typical Digital Signal Processing

system and also mention the advantages of DSP over ASP.

[05]

(b) Prove convolution of two sequences in time domain is equivalent to

multiplication of two sequences in frequency domain i.e.

X1[n] * X2[n] = X1[Z]X2[Z]

[05]

Q.2 (a) 1. Determine if the systems described by the following input-output relations

are causal or non-causal.

(i) Y (n) = x (n) - x (n-1) (ii) y (n) = ax (n)

(iii) Y (n) = x (n) + 3x (n+4) (iv) y (n) = x (-n).

Also give an example of LTI system.

[06]

(b) Use the bilinear transformation to convert the analog filter with system

function

into a digital filter.ωr= π/4.

[05]

(c) Classify the following systems

i) Linear Vs.nonlinear systems ii) FIR system Vs. IIR system

[04]

OR

Q.2 (a) List down properties of Z-transform and prove differentiation property in Z-

domain.

[06]

(b) Find out H(z) for the given H(s) = 2/( s2 + 3s +2) using impulse invariance

method. Take T= 1s

[05]

(c) Determine Z transform including ROC of the sequence,

𝑥 𝑛 = − 1

3 𝑛

𝑢 𝑛 − 1

2 𝑛

𝑢 −𝑛 − 1

[04]

Q.3 (a) Determine the inverse-z transform of the function X (z) =log (1+az-1

). [06]

(b) Perform convolution using tabulation method.

h[n]={1,2,1,-1} and x[n] = {1,2,3,1}

↑↑

[05]

(c) Determine the inverse z-transform of the function

X(z) = 1 , |z| > 1

-------------------------

(1-1.5z-1

+0.5z-2

)

04]

OR

Q.3 (a) Obtain Direct Form I & II realization, cascade of a system described by [06]

y(n) – 1/6 y(n – 1) + 1/3 y(n-2) = x(n) + 2x(n-2)

(b)

Find Inverse Z Transform of the above equations.

[05]

(c) State and prove time shifting property of Z transform and determine Z

transform for(2)n+2

u(n-1).

[04]

Enroll. No. _____________

SILVER OAK COLLEGE OF ENGINEERING & TECHNOLOGY

BE - SEMESTER–VII • MID SEMESTER- I EXAMINATION – WINTER 2018

SUBJECT: Wireless Communication (2171004) (EC)

DATE: 08-08-2018 TIME: 10:00 to 11:30 am TOTAL MARKS: 40

Instructions: 1. All the questions are compulsory. 2. Figures to the right indicate full marks. 3. Assume suitable data if required.

Q.1 (a) Define following terns: (1) Forward Channel (2) Reverse Channel (3) Control [03]

channel

(b) Describe evolution of 1G, 2G and 3G mobile phone systems. [03]

(c) Advantage of CDMA system [04]

Q.2 (a) Describe in details GPRS architecture with necessary block diagram [06]

(b) Explain the concept of umbrella cell. [05]

(c) Different between hard handoff and soft handoff [04]

OR

Q.2 (a) Describe in details GSM architecture with necessary block diagram and its various blocks. [06]

(b) Explain the concept of Cell Splitting and Cell Sectoring. [05]

(c) Define co-channel interference and adjacent channel interference [04]

Q.3

(a) Explain in detail about the various types of channel used in GSM. [06]

(b) Describe in details of Rake receiver in CDMA with necessary block diagram. [05]

(c) Explain Micro Cell Zone Concept. [04]

OR

Q.3 (a) Explain handover concept in detail. [06]

(b) Explain the concept of Frequency Reuse. [05]

(c) Give Comparisons between GSM, IS-136 and IS-95. [04]

Enroll. No. _____________

SILVER OAK COLLEGE OF ENGINEERING & TECHNOLOGY

BE - SEMESTER–VII • MID SEMESTER-I EXAMINATION – WINTER 2018

SUBJECT: Satellite Communication (2171007) (EC)

DATE: 09-08-2018 TIME: 10:00 am to 11:30 am TOTAL MARKS: 40

Instructions: 1. All the questions are compulsory. 2. Figures to the right indicate full marks. 3. Assume suitable data if required.

Q.1

(a) Define following Term for Earth Orbiting Satellites.

(i) Ascending Node

(ii) Descending Node

(iii) Sub satellite path

(iv) Prograde orbit

(v) Line of apsides

[05]

(b) Explain Kepler’s three laws with their importance in Satellite Communication. [05]

Q.2

(a) Write a short note on polar mount antenna. [06]

(b) A geo stationary satellite is located at 90 degree W. Calculate the azimuth angle for an earth-

station antenna at latitude 35 degree N and longitude 100 degree W. Also find range and

antenna elevation angle.

[05]

(c) Explain what is meant by thermal control and why this is necessary in a satellite. [04]

OR

Q.2

(a) Explain what is meant by satellite attitude. [06]

(b) Briefly describe orbital elements. [05]

(c) Write a short note on : Universal time & sidereal time. [04]

Q.3

(a) What is station keeping? Describe maneuvers required in station keeping. [06]

(b) Explain in detail earth eclipse of satellite and sun transit outage. [05]

(c) Determine the limits of visibility for an earth station situated at mean sea level, at latitude

48.42 degree N and longitude 89.26 degree W. Assume a minimum angle of elevation of 5

degree.

[04]

OR

Q.3

(a) Explain in detail TT&C subsystem. [06]

(b) What is the use of polar mount antenna?

Determine the angle of tilt required for a polar mount used with an earth station at latitude 49

degree N. Assume a spherical earth of mean radius 6371 km, and ignore earth-station altitude.

[05]

(c) Explain atmospheric losses and rain attenuation. [04]

Enroll. No. _____________

SILVER OAK COLLEGE OF ENGINEERING & TECHNOLOGY BE - SEMESTER–VII • MID SEMESTER-I EXAMINATION – WINTER 2018

SUBJECT: Data communication & Networking (2171008) (EC) DATE: 13/08/2018 TIME: 10:00 to 11:30am TOTAL MARKS: 40

Instructions: 1. All the questions are compulsory. 2. Figures to the right indicate full marks. 3. Assume suitable data if required.

Q.1 (a) Explain Bridge, Router, Hub, Switch and Gateway in brief. [05]

(b) Compare Packet switching and circuit switching. [05]

Q.2 (a) Draw and explain OSI reference model for Network. Also describe each layer in detail. [06]

(b) What is framing? List all methods used for framing and explain any two in detail.

[05]

(c) What is network topology? Explain different network topologies with example and compare

them.

[04]

OR

Q.2 (a) What are the functions of data link layer in the network. Explain in detail. [06]

(b) Classification of transmission media in detail. [05]

(c) Write short note on HDLC. [04]

Q.3 (a) Explain sliding window protocol in detail. [06]

(b) Discuss error detection and correction methods. [05]

(c) Differentiate Pure ALOHA and Slotted ALOHA protocols. [04]

OR

Q.3

(a) Discuss channel allocation problems in network. Also explain solution in detail. [06]

(b) Explain TCP/IP Reference model. [05]

(c) Write a short note on Ethernet. [04]