DADI INSTITUTE OF ENGINEERING & TECHNOLOGY (Approved by A.I.C.T.E., New Delhi & Affiliated to JNTUK, Kakinada)

NAAC Accredited Institute

An ISO 9001:2008, ISO 14001:2004 & OHSAS 18001:2007 Certified Institute.

NH-5, Anakapalle – 531002, Visakhapatnam, A.P.

Phone: 08924-221111 / 221122/9963994049, www.diet.edu.in, E-mail: examcell@diet.edu.in

Department of Electronics and Communication Engineering

II B.Tech (ECE) Sem-II QUESTION BANK Subject: Electronic Circuit Analysis (R16)

Faculty: K.SOMESWARARAO , Assistant Professor, ECE Department

Unit-I

1. a) Sketch the circuit of a Common Source amplifier. Derive an expression for the Voltage gain. (5) b) The h-parameters of the transistor used in CE amplifier are hfe= 50, hie=1.1KΩ, hre= 2.5×10-4, hoe = 24µA/V. Find out current gain and voltage gains with and without source resistance , input and output impedances , given that RL= 10 K and RS= 1 K (5)

2. a) State Miller's theorem. Explain its significance in transistor circuit analysis. (5) b) For the Common Gate amplifier, derive expressions for voltage gain, input impedance and output impedance. Neglect capacitances. (5)

3. a) Draw the circuit diagram of Common Drain amplifier and derive an expression for its Voltage gain. (5) b) Explain the frequency response of CE amplifier and Gain bandwidth product. (5)

4. a) Draw the equivalent diagram of a single stage CE amplifier at high frequencies. Derive the expression for gain under short circuited load conditions. (5) b) When a Ge PNP transistor is biased at 2mA, 15V, it has a base width of 1 micron. Find Ce and fT if DB=47cm2/sec. (5)

5. a) Draw the High frequency model of a Transistor. Derive the relationship between high frequency and low frequency parameters. (5) b) Compare, CS, CG, and CD amplifier circuits at high frequencies. (5)

Unit-II

1. a) Explain the classification of amplifiers(5) b.) Explain methods of coupling. (5)

2. a) Explain the analysis of Cascaded transistor amplifier. (5) b) What are its advantages? (5)

3. a) Give the analysis of two stage RC coupled amplifier(5) b) What are its advantages? (5)

4. a) Explain the analysis of Darlington amplifier. (5) b) Explain the analysis of Cascode amplifier. (5)

5. a) Explain the analysis of Boot-strap amplifier. (5) b) Explain the analysis of Differential amplifier using BJT. (5)

Unit-III

1. a) Discuss quantitatively about the effect of negative feedback on i) Gain ii) Bandwidth iii) Distortion v) Input resistance and vi) output resistance. (10)

2. a) Draw the circuit diagram of a current series feedback amplifier. Derive expressions to show the effect of negative feedback on input & output impedances (6) b) Calculate Transconductance with feedback. (4)

3. a) Draw the circuit diagram of a voltage series feedback amplifier. Derive expressions to show the effect of negative feedback on input & output impedances (6) b) Calculate Voltage gain with feedback. (4)

4. a) Draw the circuit diagram of a current shunt feedback amplifier. Derive expressions to show the effect of negative feedback on input & output impedances (6) b) Calculate Current gain with feedback. (4)

5. a) Draw the circuit diagram of a Voltage shunt feedback amplifier, Derive expressions to show the effect of negative feedback on input & output impedances(6) b) Calculate Transresistance with feedback. (4)

Unit-IV0

1. a) What are the differences between an oscillator and an amplifier? Explain the operating principle of an oscillator. (5) b) Explain frequency stability and amplitude stability. (5)

2. a) Draw and explain the operation of Colpitt’s oscillator and derive its expression for frequency of oscillations. (7) b.) Explain briefly about Crystal Oscillator (3)

3. a) Draw and explain the operation of Hartley oscillator and derive its expression for frequency of oscillations. (7) b) Compare Colpitt’s and Hartley Oscillators.(3)

4. a) Draw and explain the operation of Wein Bridge oscillator and derive its expression for frequency of oscillations. (7) b) What are the advantages of a crystal oscillator over an LC oscillator? (3)

5. a) Draw and explain the operation of RC Phase shift oscillator and derive its expression for frequency of oscillations. (6) b) Differentiate between LC and RC oscillators? (4)

Unit-V

1. a) Classify large signal amplifiers based on its operating point. Distinguish these amplifiers in terms of the conversion efficiency.(5) b) Draw the push-pull power amplifier circuit. Derive the expression for the output current in push-pull amplifier with base current as Ib= Ibm sinωt. (5)

2. a) What is Harmonic distortion in transistor amplifier circuits? Discuss second harmonic distortion. (5) b) A single transistor is operating as an ideal class B amplifier with a 500 load. A dc meter in the collector circuit reads 10mA. How much signal power is delivered to the load? (5)

3. a) Explain the analysis of Class-A amplifier. (5) b) Explain about Class AB amplifier. (5)

4. a) Write short notes on requirement and types of heat sinks for power dissipation in large signal amplifiers. (5) b) With the help of a neat circuit diagram, explain the operation of a complementary symmetry configured class B power amplifier. (5)

5. a) Derive the expressions for maximum Theoretical efficiency for (i) Transformer coupled (ii) Series fed amplifiers. (6) b) What are their advantages and disadvantages? (4)

Unit-VI

1. a) Draw the circuit diagram and small signal AC equivalent circuit of a single tuned amplifier (using BJT) with the tank circuit connected at the input side.(5)

b) With a neat diagram show how to cascade tuned amplifiers and determine gain and bandwidth? (5) 2. a) What is synchronous tuning? Derive an expression for bandwidth of an n-stage synchronously tuned

amplifier? (5) b) Show that for an ’n’ stage synchronously tuned amplifier; maximum bandwidth is obtained when the single stage gain is 4.34 dB. (5)

3. a) Derive an expression for bandwidth of a capacitive coupled tuned amplifier in CE configuration. Make necessary assumptions and mention them. (7) b) What are staggered tuned amplifiers? (3)

4. a) Draw the circuit diagram of a Double tuned amplifier. Draw and explain in detail the frequency response for different values of coefficient of coupling (K) i.e. K=1, K= 1.5, K=2 and also (7) b) Explain what is Loose coupling and Tight coupling? (3)

5. a) Discuss the necessity of stabilization circuits in tuned amplifiers. (5) b) Explain the principle and working of wide band amplifiers. (5)

DADI INSTITUTE OF ENGINEERING & TECHNOLOGY (Approved by A.I.C.T.E., New Delhi & Affiliated to JNTUK, Kakinada)

NAAC Accredited Institute

An ISO 9001:2008, ISO 14001:2004 & OHSAS 18001:2007 Certified Institute.

NH-5, Anakapalle – 531002, Visakhapatnam, A.P.

Phone: 08924-221111 / 221122/9963994049, www.diet.edu.in, E-mail: examcell@diet.edu.in

Department of Electronics & Communications Engineering

II B.Tech (ECE) Sem-II QUESTION BANK Subject: Management Science (R16)

Faculty: Dr.G.Santhoshi Kumari, Asst. Professor, MBA Department

I UNIT

1. a) What is the significance of Hawthorne experiments for management?

b) Define Management and explain its functions.

2. a) Define Management? Explain Henry Fayol’s principles of management?

b) Explain the importance of management in organisation?

3. a) Explain the nature of management?

b) What are the challenges you have to face as a manager?

4. a) Describe the theory of scientific management and explain how it was criticized.

b) What is line and staff organization and what is its uniqueness?

5. a) Why is management considered as a profession and what factors make it a

profession?

b) Distinguish between Theory – X and Theory – Y?

6. a) What is motivation? Explain Abraham Maslow’s needs Hierarchy theory.

b) What do you mean by Functional organization structure

7 ) Expalin the concept of GLOBE structure?

II UNIT

1. a) Describe the basic procedure to be followed in adopting work study techniques for

Sound results?

b) What is inventory? Explain the need for inventory control?

2. a) Define operations management and explain priciples of operations management?

b) Define control charts and explain its types?

3. a) What s meant by materials management? Explain its advantages and disadvantages.

b) Explain the types of ABC analysis.

4. What is statistical quality control? How is this important in operations management?

5) Explain EOQ Analysis with diagrammatic representation?

III UNIT

1. a) State the importance and methods of job evaluation?

2. a) Define marketing and marketing management?

(b) Explain briefly the functions of marketing?

3. a) Explain the functions of personnel management?

b) Define personnel management?

4. a) Explain the channels of distribution in marketing ?

b) Define Human Resource Development?

5. a) Define Human Resource Management. Explain its functions of HR manager?

b)Expalin the concept of Industrial Relations?

6. a) Discuss in brief about various wage payment plans? Are they relevant in present day

Context.?

b) What is product life cycle? Describe its stages?

Describe its stages?

IV UNIT

1. From the following information:

a) Draw the network

b) Find its critical path and project duration

c) Determine Total, Free and Independent Floats.

Activity Duration

1-2 5

1-3 4

2-4 6

3-4 2

4-5 1

4-6 7

5-7 8

6-7 4

7-8 3

2. From the following information:

(a) Draw the PERT network

b) Identify the critical path and projection duration.

Activity To Tm Tp

1-2 3 3 3

2-3 3 6 9

2-4 2 4 6

3-5 4 6 8

4-6 4 6 8

5-6 0 0 0

5-7 3 4 5

6-7 2 5 8

3. a) What is CPM? Discuss its advantages and limitations.

b) Distinguish between PERT and CPM.

5. a) What is PERT? State its advantages and limitations

b) What is CPM? Explain its advantages.

V UNIT

1. (a) How do you formulate and implement strategy? Explain

(b) What is the need for corporate planning process?

2. (a) what are the factors of external and internal environmental to be considered

for formulating the strategy? Explain.

(b). Explain various generic strategy alternatives in detail

3. (a) Define strategic management and describe the process of strategic management.

(b) How do you carry out SWOT analysis for a manufacturing unit?

4. (a) What do you understand by the concept of strategy? Discuss the concept of Mission and

Vision.

(b). Discuss corporate planning process.

5. (a). Explain various external environment scanning techniques used by the organization

(b) What is environmental scanning? How is this important in present day context.

VI UNIT

1. Write a notes on:

(a) Capability Maturity Model (b) Balanced Score card.

2. Write a notes on :

(a) Supply Chain Management b) Performance Management.

3 (a) What is Enterprise Resource Planning? Explain

(b) Explain the merits and demerits of Enterprise Resource Planning.

4. (a) define total quality management and explain its significance.

(b) Write notes on six sigma

5. Write short notes on:

(a) Management Information System (b) Bench Marking.

6. Discuss the following;

a) Supply Chain Management b) Enterprise Resource Planning

DADI INSTITUTE OF ENGINEERING & TECHNOLOGY (Approved by A.I.C.T.E., New Delhi & Affiliated to JNTUK, Kakinada)

NAAC Accredited Institute

An ISO 9001:2008, ISO 14001:2004 & OHSAS 18001:2007 Certified Institute.

NH-5, Anakapalle – 531002, Visakhapatnam, A.P.

Phone: 08924-221111 / 221122/9963994049, www.diet.edu.in, E-mail: examcell@diet.edu.in

QUESTION BANK

Name of faculty: Mr. P. Ram Prasad Subject: EMWTL

Year: II / IV, II-Semester Branch: ECE

Regulation: R16 Academic Year: 2018-2019

UNIT – I: Electrostatics

1. a. Point charges 4 mc and -3 mc are located at (2, 1, -3) and (-1, -2, 4) respectively. Calculate the electric

force on a 12nc charge located at (0, 3, 1) and the electric field intensity at that point.

5M

b. State the applications of Gauss Law with respect to a) Point charge b) Infinite line charge 5M

2. a. Derive an expression for the electric field intensity due to a finite length line charge along

the Z- axis at an arbitrary point Q( x,y,z). 5M

b. The finite sheet 0 ≤ x ≤ 1 and 0 ≤ y ≤ 1 on the z =0 plane has a charge density ρs = xy(x2

+ y2 + 25 )

3/2

nC/m2 Find 5M

i. The total charge on the sheet

ii. The electric field at (0,0,5)

iii. The force experienced by a -1nC charge located at (0, 0, 5).

3 a. Briefly explain Dielectric constant and its strength. 5M

b. Explain about continuity equation and relaxation time. 5M

4. a. Explain about the parallel plate capacitor and coaxial capacitor with necessary equations. 5M

b. With necessary equations explain poisson’s and Laplace’s equation. 5M

5. a. If D = 2x2ax + ay + 2z

2 pC/m

2. Derive volume charge density. 5M

b. Give the Maxwell’s equations for electrostatic fields. 5M

6. a. Explain about Electric flux density. Determine D at (4, 0, 3) if there is a point charge -5П mC at (4,0,0)

and a line charge at 3П mC/m along the y-axis. 5M

b. Write about convection current and conduction current. 5M

UNIT – II: Magnetostatics & Maxwell’s Equations for Time Varying Fields.

1. a. Derive expression for magnetic field at any point on the axis at a distance ‘h’ from the centre of a circular

loop of radius ‘a’ and carrying current ‘I’. 5M

b. State and explain Biot – Savart’s law. Give the expressions of Biot – Savart’s law for line, surface and

volume currents. 5M

2. a. State Ampere’s circuit law and explain. Give its applications. 6M

b. Explain about inconsistency in Ampere’s Law. 4M

3. a. A circular loop located on x2 + y

2 = 9 and z = 0 carries a direct current of 10A along aф. Determine H at

(0, 0, 4) and (0, 0, -4). 5M

b. With necessary equations explain about Magnetic scalar and Vector potential. 5M

4. Explain about the following

i. Force on a charged particle. 5M

ii. Force on a current element. 5M

5. a. Write about the following Dielectric – Dielectric Boundary Condition and Conductor dielectric

boundary condition. 5M

b. State the Faraday’s Law and explain briefly. 5M

6. a. State all Maxwell’s equations in differential and integral form for time varying fields. 5M

b. Explain the concept displacement current and derive its necessary equations. 5M

UNIT – III: EM Wave Characteristics - I

1. Define and explain the terms

i. Skin Depth 4M

ii. Intrinsic Impedance of free space 3M

iii. Phase Constant. 3M

2. a. Derive the expression for attenuation and phase constants of uniform plane wave. 5M

b. Prove that E and H are perpendicular to each other in uniform plane waves. 5M

3. Derive the expression for wave equation in

i. Lossless Dielectric 4M

ii. Good Conductors 3M

iii. Free Space 3M

4. A plane wave with E = 2 V/m and has a frequency of 300MHz is moving in free space impinging on thick

copper sheet located perpendicular to the direction of the propagation. Find

i. E and H at the plane surface 4M

ii. Depth of penetration 3M

iii. Surface Impedance 3M

5. a. In a lossless medium for which η = 60П, µr = 1 and H = - 0.1cos (ωt - z) ax + 0.5 sin (ωt - z)ay A/m.

Calculate εr, ω and E. 5M

b. An elliptical polarized wave has an electric field of E = sin (ωt - ßz) ax + 2 sin (ωt – ßz + 750)ay V/m.

Find the power per unit area conveyed by the wave in free space. 5M

UNIT-IV: EM Wave Characteristics - II

1. a. What is Brewster angle? Derive the expression for the same. 5M

b. Discuss about power loss in plane conductor. 5M

2. a. State and prove the critical angle theorem. 5M

b. Derive an expression for reflection when a wave is incident on a dielectric obliquely with parallel

polarization. 5M

3. a. State and prove Poynting theorem. 5M

b. For good dielectric derive the expression for α, ß, v and η. 5M

4. a. Find the depth of penetration ᵟ of an EM wave in copper at f = 60Hz and f = 100MHz. For copper σ = 5.8

x 107 mho/m, εr = 1 and µr = 1. 5M

b. Prove that E i = - E r when the wave is normal incidence on a perfect conductor. 5M

5. a. A plane wave travelling in air is normally incident on a material with µr = 1 and εr = 4. Find the reflection

and transmission coefficient. 5M

b. Define and derive the transmission coefficient of a wave incidence in normal on dielectric. 5M

UNIT – V: Transmission Line – I

1. a. Derive the relationship between the primary constants and secondary constants in a transmission line.

5M b. Derive the expression for the input impedance of a transmission line length L. 5M

2. a. Show that a transmission line will be distortion less free if RC = LG 5M

b. A high frequency line has the following primary constants L=1.2 mH /Km, C=0.05µF/Km.

R = G = negligible. Determine the characteristics impedance and propagation constant of the

line. 5M

3. a. List out applications of smith’s chart. How to measure them? 5M

b. Give details about smith chart and write steps how to calculate impedance, reactance, and

wavelength using this chart. 5M

4. a. Define and explain both lossless and distortion less transmission lines in terms of transmission lines

parameters. 5M

b. State the impedance relations, reflection coefficient and VSWR for 5M

i. Shorted line

ii. Open circuited transmission line.

5. a. A lossy cable which has R = 2.25Ω/m , L = 0.1µH/m, C = 1 pF/m and G = 0 operates at f = 0.5 GHz. Find

the attenuation constant of the line. 5M

b. Define the term characteristic impedance and derive the expression for it. 5M

6. a. A transmission line in which no distortion is present has the following parameters:

Z0 = 50Ω, α = 0.02 m-1

, v = 0.6 v0. Determine R, L, G, C and wavelength at 0.1GHz. 5M

b. List out types of transmission lines and draw their schematic diagrams 5M

7. a. Define phase & group velocities in transmission line and derive the relation between them. 5M

b. A lossless transmission line used in a TV receiver has a capacitance of 50pF/m and an inductance of 200

nH/m. Find the characteristic impedance for section of a line 10m long. 5M

UNIT – VI: Transmission Line - II

1. a. Write short notes on stub matching technique. 5M

b. For a uniform transmission line, the open and short circuit impedances are given by Zoc = (50 + j25 ) Ω

and Zsc = (60 – j20) Ω. Find Z0 of the line. 5M

2. a. Define the reflection coefficient and derive the expression for the input impedance in terms of reflection coefficient. 5M

b. Explain with sketches how the input impedance varies with the frequency. 5M

3. a. List out types of transmission lines and draw their schematic diagrams 5M

b. A low transmission line of 100Ω characteristic impedance is connected to a load of 400Ω. Calculate the

reflection coefficient and standing wave ratio. 5M

4. a. Discuss the configuration of the smith chart considering the two families of constant circles. 5M

b. What are the advantages and disadvantages of stub matching? 5M

5. a. A transmission line in which no distortion is present has the following Parameters Z0 = 60Ohms, α =

20m Np/m, v = 0.7v0. Determine R, L,G, C and wavelength at 0.1GHz. 5M

b. Discuss the applications of smith chart. 5M

6. a. Write short notes on reflection coefficient and VSWR? Derive the relation between them. 5M

b. Write short notes on different lengths of transmission lines with open end load. 5M

Page 1 of 4

DADI INSTITUTE OF ENGINEERING & TECHNOLOGY (Approved by A.I.C.T.E., New Delhi & Affiliated to JNTUK, Kakinada)

NAAC Accredited Institute

An ISO 9001:2008, ISO 14001:2004 & OHSAS 18001:2007 Certified Institute.

NH-5, Anakapalle – 531002, Visakhapatnam, A.P.

Phone: 08924-221111 / 221122/9963994049, www.diet.edu.in, E-mail: examcell@diet.edu.in

II B.TECH-IISEM Question Bank

Subject Name:: P&DCBranch:ECE- B Faculty: S Suresh Kumar

UNIT-1

1. a) What is meant by linear wave shaping (4M)

b) Show that the output of a differentiator circuit is derivative of the input. What are the assumptions to

be made in the derivation? (6M)

2. a) Explain RL and RLCs circuits(4M)

b) Obtain the expression for percentage tilt P in the response of an RC high pass Network to a

symmetrical square-wave(6M)

3. a) Discuss the application of an attenuator as a CRO probe.(5M)

b) Why a capacitor in a high-pass RC circuit is named as blocking capacitor.(5M)

4. a) Draw the low pass RC circuit and explain its working.. (4M)

b) Draw high-pass RC circuit. Explain its response to a square-wave input.(6M)

5. a) Derive the expression for rise-time of pulse waveform after passing through low-pass RC circuit(8M)

b) Define ringing circuit(2M)

UNIT-2

1. a) Explain how clipping at two independent levels can be achieved. .(5M)

b) Explain the operation of a diode comparator with a ramp input signal. .(5M)

2. a) Define clipper. Explain the positive peak clipper.(5M)

b) Draw a transistor clipper and explain its operation.(5M)

3. a) What is the difference between the output from a clipping circuit and a clamping circuit? Explain

with neat sketches.(5M)

b) State and prove the clamping circuit theorem?(5M)

Page 2 of 4

4. a) What do you mean by positive clamping and negative clamping(5M)

b) Explain about practical clamping circuit(5M)

5. Draw the circuit diagram of an Emitter-Coupled clipping circuit. Explain its operation with its transfer

characteristic and necessary expressions. (10M)

UNIT-3

1.a)What is meant by multi vibrator? Explain the operation of fixed-bias multi vibrator. (6M)

b) What are Commutating capacitors(4M)

2. a) Define the statement TRANSISTOR AS A SWITCH.(5M)

b) Explain the diode switching times.(5M)

3. a) What is a Bistable circuit? What are the other names of a bistable multivibrator?(5M)

b) What are the applications of a bistable multivibrator?(5M)

4 a) Explain the saturation parameters of Transistor and their variation with temperature(5M)

b) Briefly explain the Triggering of Binary Circuits(5M)

5 a) Explain the stable stated voltages and currents in a fixed bias binary(5M)

b)Explain the operation of Schmitt trigger (5M)

UNIT-4

1. a) Explain the operation of Monostable multivibrator. (5M)

b) Explain how the Astable multi vibrator can be used as voltage to frequency converter. (5M)

2. a) For a mono stable multi vibrator calculate the input pulse width for the design values of RC = 2 kΩ,

RB = 10 kΩ, C = 0.1 µF, VCC = 10 V, VBE(sat) = 0.8 V. (7M)

b) Explain the triggering in mono stable multi vibrator. (3M)

3. a) In an astable multivibrator, the base resistors are of 12.5 kΩ and the capacitors are of 0.01µF

Determine the pulse repetition rate. (5M)

b) With the help of circuit diagrams explain the working of mono stable multi vibrator. (5M)

Page 3 of 4

4. a) Explain the application of Monostable Multivibrator

b) Draw the circuit diagram of astable multivibrator and explains its operation. (5M)

5. a) Derive the pulse width of Astable Multivibrator(5M)

b) Explain how astable multivibrator can be used as Voltage to Frequency Converter. (5M)

UNIT-5

1. a) Why are time-base generators called a sweep generators and what are the applications of it? (5M)

b) Define the sweep time and restoration time for time-base generators. (5M)

2. a) Define the terms slope error, displacement error and transmission error of time-base signal and

derive the relation among them(8M)

b) Mention the general features of time based signal. (2M)

3. a) Draw the circuit of a Boot strap sweep generator and explain its operation. Derive an expression for

its sweep time. (5M)

b) Explain with a circuit the working of a UJT sweep circuit and obtain the expressions for the intrinsic

standoff ratio (η). (5M)

4. With the circuit diagram explain current time base generator. (10M)

5. a) Explain about the transistor Bootstrap time-base generation.

b) What are the methods of generating a time-base wave form.

UNIT-6

1. a) Realize two-input AND & OR gates using diodes and explain their operation with the help of truth-

tables. 5M

b) Realize a three-input NOR gate using Resistor Transistor Logic and explain its operation with the

help of truth-table. .(5M)

2. a) Draw the circuit diagram of Nor logic using ECL and explain. (5M)

b) With the help of neat circuit diagram, explain the working of a CMOS inverter.(5M)

Page 4 of 4

3. a) What are the applications of sampling gates. (5M)

b) Explain unidirectional and bidirectional sampling gates(5M)

4. Explain four diode and six diode sampling gate (10M)

5. a) Explain the reduction of pedestal (5M)

b) Compare different logic families(5M)

DADI INSTITUTE OF ENGINEERING & TECHNOLOGY (Approved by A.I.C.T.E., New Delhi & Affiliated to JNTUK, Kakinada)

NAAC Accredited Institute

An ISO 9001:2008, ISO 14001:2004 & OHSAS 18001:2007 Certified Institute.

NH-5, Anakapalle – 531002, Visakhapatnam, A.P.

Phone: 08924-221111 / 221122/9963994049, www.diet.edu.in, E-mail: examcell@diet.edu.in

Academic Year :2018-2019

Name of the Faculty : A.V.S.Lakshmi

Designation : Asst.Professor,EEE Dept

Department :ECE

Year/Semester :II YEAR– II SEMESTER

Subject CONTROL SYSTEMS

UNIT-1

1. A) What are the advantages and disadvantages of closed loop control system [4M]

B) What is the classification of control system and discuss the importance of mathematical modelling of

control system[6M]

2. A) Explain Masons gain formula [4M]

B) Draw the signal flow graph x1+5x2-2x3=0 and x3+2x4-4x2=0 [6M]

3. A) Write force balance equation of ideal dashpot [4M]

B) What do you mean by sensitivity of control system and discuss the effect of feedback on sensitivity

[6M]

4. A) What are the characteristics for negative feedback [4M]

B) Draw the equivalent signal flow graph for the figure shown below and determine the C(s)

R(s) Mason’s

gain formula [6M]

5. A) Explain the linearizing effect of feedback [4M]

B)Determine the transfer function x1(s)/F(s)

[6M]

UNIT-2

1. A) What is the difference between type and order of system [4M]

B) Find the time domain specifications for G(s)H(s) =20

(s2+7𝑠+25) [6M]

2. A) Define position, velocity, acceleration and error constants [4M]

B) Explain steady state erro in terms of error constants for type 1 and type 2 systems[6M]

3. A) What are the standard test signals [4M]

B) The open loop transfer function of unity feedback control system is G(s)= K

𝑠(s+10) find the range

of K for which the peak overshoot is less than 12% [6M]

4. A) Define steady state error [4M]

B) Explain the working of synchro transmitter and receiver pair[6M]

5. A) How damping ratio affects the time response of 2nd

order system [4M]

B) [6M]

UNIT-3

1. A) What is the necessary and sufficient condition for stability [4M]

B) Determine the range of K for which the system having the characteristic equation 𝑆4 + 20KS3 +5S2 + 10S + 15 = 0 is stable.[6M]

2. A) Explain about routh Hurwitz criterion [4M]

B) Determine the stability of closed loop system whose open loop transfer is 5(2s+1)

(𝑠(𝑠+1)(1+3𝑠)(1+0.5𝑠) using

R-H criterion[6M]

3. A) Define break away point on root locus [4M]

B) Explain briefly about root locus technique [6M]

4. A) What are the limitations of Routh criterion [4M]

B) Explain the effect of adding poles and zeros to G(s) H(s) on the root locus [6M]

5. A) What are advantages and disadvantages of root locus [4M]

B) Draw the complete root locus for G(s)H(s)= K

s(s+2)(s+4) [6M]

UNIT-4

1. A) Define phase margin and gain margin [4M]

B) Explain the procedure for constructing the polar plot [6M]

2. A) State the nyquist stability criterion [4M]

B) Determine the resonant frequency wr , resonant peak mp, bandwidth for the system whose transfer

function is G(jw) =5

(5+j2w+ jw 2) [6M]

3. A) Explain gain cross over frequency and phase cross over frequency [4M]

B) Sketch the bode plot for G s =1

(s(s+1)(s+2) [6M]

4. A) What is the effect of polar plot if a non zero pole is added to the transfer function[4M]

B) Define frequency domain specifications [6M]

5. A) Explain the advantages of bode plot [4M]

B) Draw the nyquist plot for the transfer function G s =(s+2)

𝑠+1 (𝑠−1)

UNIT-5

1. A) Draw the electrical equivalent circuits of lead lag and lag lead compensator [4M]

B) The open loop transfer function of a unity feedback system is G(s) =K

s(s+2) design a lead

compensator to have a velocity error constant of 20s-1

and a phase margin of atleast 500[6M]

2. A) What is the need of lag lead compensator [4M]

B) A system has G(s) =0.035

s 1+0.5s (1+0.04s) design a suitable lag compensator to give velocity of error

constant 27.3s-1

and phase margin 450.

[6M]

3. A) Write the properties of lag compensator [4M]

B) Explain the design of phase lag controller [6M]

4. A) What are the different types of electrical compensator [4M]

B) Explain the procedure of bode plot for a lag lead compensator in procedure steps[6M]

5. A) What is the need of compensation [4M]

B) Explain the effects of proportional, integral and derivative terms on PID Controllers on system

performance [6M]

UNIT-6

1. A) What are the advantages of state space representation[4M]

B) Find the Observability and controllability of the system given by x = Ax + Bu and y=Cx where

A = −1 −4 −1−1 −6 −2−1 −2 −3

B = 011 C = 1 1 1 [6M]

2. A) What is observability [4M]

B) The state equation of linear time invariant system is given below X1

X2 =

−2 01 −1

X1

X2 +

01 u determine state transition matrix [6M]

3. A) Explain the concept of state and state variable [4M]

B) Determine the controllability and Observability of the system [6M]

4. A) What are the properties of state transition matrix [4M]

B) A linear time invariant system is given by equation X = 0 6−1 5

𝑋 + 01 u y =

1 0 𝑋 X 0 = 00 obtain state transition matrix[6M]

5. A) What is controllability [4M]

B) Determine the state model of the system characterized by the differential equation(s4 + 8s3 + 2s2 +4s + 3)Y s = 10U(s) [6M]

DADI INSTITUTE OF ENGINEERING & TECHNOLOGY (Approved by A.I.C.T.E., New Delhi & Affiliated to JNTUK, Kakinada)

NAAC Accredited Institute

An ISO 9001:2008, ISO 14001:2004 & OHSAS 18001:2007 Certified Institute.

NH-5, Anakapalle – 531002, Visakhapatnam, A.P.

Phone: 08924-221111 / 221122/9963994049, www.diet.edu.in, E-mail: examcell@diet.edu.in

DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING DIGITAL IC APPLICATIONS

Academic Year : 2018-2019

Name of the Faculty : B. NEELIMA DEVI

Designation : ASST.PROFESSOR

Department : ECE

Year/Semester : II YEAR– II SEMESTER

Regulation : R16

Subject : Analog Communications

UNIT 1 - AMPLITUDE MODULATION

1. (a) As related to AM, what is over modulation, under modulation and 100% modulation? 3M

(b) Explain the Square law method of demodulating an AM wave 7M

2. (a) A transmitter radiates 15 kW without modulation and 20.125 kW after modulation. Determine

depth of modulation. 7M

(b) Draw the phasor diagram of AM signal. 3M

3. (a) Define Amplitude modulation. What are its applications 4M

(b) An audio frequency signal 10 sin 2_π500t is used to amplitude modulate a carrier of 50 sin 5_105

t. Calculate 6M

i. Modulation index

ii. Side band frequencies

iii. BW required

4. (a) What is multiplexing? Explain with suitable example?

or

(a)With a neat sketch explain the FDM. 5M

(b) A modulating signal of 2 cos5000t is amplitude modulated over a carrier signal of 5cos20000t.

Derive expressions for the modulation index, LSB and USB frequencies, Bandwidth and the ratio of

Side Band Power in the Total Power of AM wave. 5M

5. What is the principle of Amplitude modulation? Derive expression for the AM wave and draw its

spectrum. 10M

6. (a) Explain the process of demodulating an AM wave using diode detector 6M

(b) When a signal m(t) = 3 cos (2π x 103t) modulates a carrier c(t) = 5 cos (π x 10

6t),find the

modulation index and transmission bandwidth if the modulation is AM. 4M

UNIT-II- DSB & SSB MODULATION

1. (a) What are the advantages of VSB-AM? 3M

(b) Draw the block diagram for the generation of a VSB signal and explain the principle of operation

7M

2. (a) What is VSB? What is its significance? 3M

(b) Obtain a relationship between carrier and side band powers in an SSBSC wave and explain how

power distribution takes place in SSB SC system. 7M

3. (a) What are the Advantages of SSB? 3M

(b) Discuss the generation of SSB signal using phase discrimination method. 7M

4. (a) Obtain a relationship between carrier and side band powers in DSBSC wave and explain how

power distribution takes place in DSB SC system. 4M

(b)What are the disadvantages of DSB-FC. 3M

(c) Explain the detection of DSB signals using COSTAS Loop 3M

5. (a)Draw the circuit diagram of balanced modulator using transistors and show that it produces DSB-

SC wave. 5M

(b)Explain the generation of SSB signal using balanced modulator and phase shifter 5M

UNIT-III- ANGLE MODULATION

1. (a) List the properties of Bessel function 3M

(b) What is the bandwidth required for an FM wave in which the modulating frequency signal is 2

kHz and the maximum frequency deviation is 12 kHz? 7M

2. (a) Explain Armstrong method of generation of FM signal. 5M

(b) A carrier of frequency 100 MHz is frequency modulated by a signal x(t)=20sin(200_x103 t ).

What is the bandwidth of the FM signal if the frequency sensitivity of the modulator is 25 kHz per

volt? 5M

3. (a) Distinguish between FM and PM by giving its mathematical analysis. 4M

(b) Describe the frequency analysis of Angle modulated waves. Explain their Bandwidth

requirements. 6M

4. Explain the principle of Angle Modulation. Derive and explain phase deviation, Modulation index,

frequency deviation and percent modulation 10M

5. (a) Compare the noise performance of AM and FM Systems 5M

(b) Distinguish between Narrow band FM over Wide band FM 5M

6. (a) With a neat sketch explain the principle of operation of Phase locked loop. 5M

(b) Compare the advantages and disadvantages of angle modulation with amplitude modulation 5M

UNIT-IV-TRANSMITTERS & RECEIVERS

1. (a) Distinguish between low level and high level transmitters 5M

(b) Write in detail about the limiter used in FM receiver. 5M

2. (a) What is meant by image frequency? Explain. 5M

(b) What are the advantages of Superhetrodyne receiver over Tuned radio frequency receiver? 5M

3. (a) Explain the Characteristics of RF section. 5M

(b) Discuss briefly the similarities and differences between FM and AM receivers. 5M

4. (a) Describe the operation of variable reactance type and phase modulated FM transmitter. 5M

(b) What is the significance of AGC circuit? Differentiate between simple, delayed and amplify

AGC and explain the function with the help of neat diagram 5M

5. (a) Explain the effect of feedback on the performance of AM transmitter. 5M

(b) With neat sketch explain the principle of operation of Super heterodyne receiver. 5M

6. (a) Discuss the frequency stability of FM transmitter. 5M

(b) Write short notes on Frequency changing and tracking 5M

UNIT-V-NOISE

1. (a) What is thermal noise and shot noise? Write the expression for PSD of Thermal Noise? 5M

(b) Give the frequency domain representation of Noise. 5M

2. (a) What is Noise figure? Find the Average Noise Figure of cascaded networks 5M

(b) Discuss threshold effect in angle modulation systems 5M

3. (a) Write short notes on Modeling of Noise Sources. 5M

(b) Explain about noise in AM systems. 5M

4. (a) Explain the effect of Noise in SSB system 5M

(b) With neat sketch explain the significance of Pre-emphasis and De-emphasis. 5M

5. (a) Explain the effect of Noise in DSB system. 5M

(b) Discuss about Effective noise temperature and Noise figure 5M

UNIT-VI- PULSE MODULATION

1. (a) Draw PWM and PPM waveforms.

(b) What is PAM? What are the drawbacks of PAM.

2. (a) Distinguish between TDM and FDM.

(b) What are the different types of Pulse modulation techniques?

3. (a) With a neat sketch explain the Time Division Multiplexing

(b) Explain the demodulation of PWM, with a neat circuit diagram and waveforms.

4. (a) Explain the generation of PAM, with a neat circuit diagram and wave forms

(b) Explain the generation of PWM with a neat circuit diagram and wave forms

5. (a) What are the advantages and disadvantages of PPM over PWM

(b) Explain the generation of PPM, with a neat circuit diagram and wave forms