Paper-1 (Circuit Analysis) UNIT-I

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Paper-1 (Circuit Analysis) UNIT-I AC Fundamentals & Kirchhoff s Current and Voltage Laws 1. Explain how a sinusoidal signal can be generated and give the significance of each term in the equation? 2.

1 Paper-1 (Circuit Analysis) UNIT-I AC Fundamentals & Kirchhoff s Current and Voltage Laws 1. Explain how a sinusoidal signal can be generated and give the significance of each term in the equation? 2. Define Average value? Derive an expression for the average value of AC Signal? 3. Define RMS value? Derive an expression for the RMS value of AC Signal? 4. Define the terms Amplitude, frequency, phase, average value, RMS value of a periodic waveform and derive expression for the RMS value of an a.c waveform? 5. Explain the Phasor Diagram? Explain the operation of j operator? 6. Define Phasor and mention different forms in which a Phasor can be denoted. Explain Phasor algebra in detail? 7. What is a Phasor? Explain Phasor notation.describe how Phasors are used to represent sinusoidal wave form? 8. Explain Node voltage analysis with example? 9. State and Explain Kirchhoff s Law? 10. What is Kirchhoff s voltage Law? With the help of circuit diagram explain loop current method? π 11. An alternating current is represented by i=220sin (157t+ 2 ). Calculate i) peak value ii) average value iii) r.m.s value of current. 12. Explain the concept of ideal and practical voltage sources and discuss their V-I Characteristics? 13. Explain the concept of ideal and practical current sources and discuss their V-I Characteristics? 14. Find the current through R5 using Node Analysis. 15. Apply loop-current method to find loop currents I 1, I 2 and I 3 in the following circuit?

16. Find the currents I 1,I 2 and I 3 in the circuit given below using Kirchhoff s laws by node voltage analysis? 1. Explain the terms Complex Impedance and Admittance? 2. State KVL and KCL? 3. What is j-operator?

Explain Phasor Notation? 7. Derive an expression for the R.M.S value of an a.c voltage? 8. Derive an expression for the average value of an a.c voltage? 9.

2 16. Find the currents I 1,I 2 and I 3 in the circuit given below using Kirchhoff s laws by node voltage analysis? 1. Explain the terms Complex Impedance and Admittance? 2. State KVL and KCL? 3. What is j-operator? Write its significance in A.C circuits? 4. Define average voltage, effective or R.M.S value of ac signal? 5. Explain the terms ideal current and voltage source? 6. What is a Phasor? Explain Phasor Notation? 7. Derive an expression for the R.M.S value of an a.c voltage? 8. Derive an expression for the average value of an a.c voltage? 9. Define Polar and Rectangular forms of complex numbers? 10. Find average and R.M.S values of an A.C current represented by i=28.4 sin 628t. 11. Explain the concept of ideal and practical voltage sources? 12. Explain the concept of ideal and practical current sources? 13. Convert E=7.07+j707 into polar form? 14. Convert E= into Rectangular form? 15. Perform the following operation and express the final result in polar form Network Theorems (DC and AC) UNIT-II 1. State and Prove Superposition theorem?

2. State and Prove Norton s theorem? 3. State and Prove Milliman s theorem? 4.

State and Prove Maximum Power transfer theorem? 7.

8. Draw the Norton s equivalent of the circuit given below and determine the current I L through the Load R L?

3 2. State and Prove Norton s theorem? 3. State and Prove Milliman s theorem? 4. State and Prove Reciprocity theorem? 5. State and Prove Thevenin s theorem? 6. State and Prove Maximum Power transfer theorem? 7. Draw the Thevenin s equivalent of the circuit given below and determine the current I L through the Load R L? 8. Draw the Norton s equivalent of the circuit given below and determine the current I L through the Load R L? 9. For the circuit shown below, find the value of R L for which the power transferred to the load is maximum. Also find this power? 10. Using Superposition theorem, calculate current in each branch of the network shown in figure?

circuit and also find voltage across R L?

4 11. Find the value of R L to transfer maximum power to the load in the given circuit and also find voltage across R L? 1. Draw Thevenin s equivalent circuit for the given network shown below? 2. What is Norton s equivalent to the network shown below? 3. Find the value of R L for Maximum Power in the circuit of figure given below.

5 4. Explain Reciprocity theorem? 5. Breifly Explain Milliman s theorem? 6. Explain the significance of Thevenin s and Norton s theorem? 7. Briefly explain how maximum power can be delivered to the load? 8. Give the statements of Thevenin s and Norton s theorems and explain how they can be transformed from one to the other? 9. State and explain the Principle of Super Position Theorem? 10. State and explain the Thevenin s theorem? 11. State and explain the Norton s theorem? RC and RL Circuits UNIT-III 1. What are different types of transients? Discuss the transient response of RC circuit with suitable diagrams? 2. Explain the Transient response of R-L circuit with DC source. Define the time constants? 3. Explain the working of R-L circuit as integrator? 4. Explain the frequency response of an RC circuit? 5. Explain the frequency response of an RL circuit? 6. Explain the functioning of RC circuits as integrating network? 7. What is a high pass filter? Describe how RL circuits work as high pass filter with required mathematical analysis? 8. Discuss how RL Low pass filter functions with the necessary mathematical theory?

6 9. Derive expression for the growth and decay of current in an RL circuit? 10. Explain the action of RL differentiator circuit? 11. Explain the action of RC High pass filter circuit? 12. Define low pass filter and discuss the frequency characteristics of RC low oass filter with necessary mathematical theory? 13. Explain the action of RC Differentiator circuit? 1. Draw the circuit of RC High pass filter circuit? 2. Explain the action of passive integrator circuit? 3. Define time constants of RL and RC circuit? 4. Define cut off frequency of low pass and high pass filter circuits? 5. Draw RC differentiating circuit? 6. Draw the circuit diagram for RL Low pass filter? 7. Draw the response curve and show the cut-off frequency for RC Low pass filter? 8. Define Steady state and transient state of an electrical circuit? 9. A capacitor is being charged from a d.c source through a resistance of 2 MΩ. If it takes0.5 second for the charge to reach three quarters of its final value, find the capacity of the capacitor? 10. A charged condenser of capacity 4µF is shunted by a high resistance. If half the charge leaks through in 50 second, calculate its resistance? 11. An inductor of self inductance 5mH and resistance 5Ω is connected to a battery of negligible internal resistance. Calculate the time in which the current will attain half its steady state? 12. In an RC low pass filter, the value of R is 5KΩ and the cut off frequency is 1KHz. Find the value of C? Resonance UNIT-IV

7 1. Define the term Resonance, Obtain an expression for resonant frequency and Q-factor for series RLC circuit? 2. Define Q-factor? Obtain an expression for bandwidth of parallel RLC Resonant circuit? 3. Explain Q-factor of series and parallel resonant circuit? 4. Define resonance in a parallel LCR circuit. Find the bandwidth of parallel LCR circuits? 5. Compare series and Parallel Resonance circuit? 6. Obtain an expression for the resonant frequency and Q factor for a parallel Resonance circuit? 7. Obtain Resonant frequency and Q factor for a series LCR circuit with L=3H, C=27µF and R=7.4Ω 8. Deduce an expression for resonant frequency of series RLC circuit. Also obtain expression for lower and upper half power frequencies? 9. Draw the circuit diagram of a parallel resonant circuit and obtain an expression for its resonant frequency? 10. Explain LCR series resonance circuit condition. Define Q factor, Bandwidth and Selectivity? 11. A parallel resonant circuit having a coil of 150µH resonates at 1MHz. If value of circuit Q is 60, Calculate i) value of capacitor ii) value of resistor iii) impedance at resonance? 12. An RLC series circuit consists of a resistance R=1KΩ, an inductance of L= 100mH and a Capacitance C=10µF. Find the a) resonant frequency b) Q factor and c) half power points. 13. An RLC resonant circuit has a resonant frequency of 200Hz and a Q factor of 100. Calculate a) Bandwidth b) Lower and upper half power frequencies c) Sharpness of resonance. 14. A series RLC circuit has R=5Ω,L=40mH and C=1µF.Calculate i) Resonant frequency ii) Q of the circuit iii) Bandwidth. 1. Write about Selectivity? 2. A series RLC circuit has R=5KΩ, L= 40mH, C=1mF. Calculate i) Q-factor ii) Bandwidth. 3. Define Bandwidth and Selectivity of RLC circuit? 4. Why a series circuit is called acceptor circuit? 5. A series LCR circuit has Q=120 at resonance, a capacitance 200PF connected in series with an inductance of 150 µh. Calculate its bandwidth? 6. Show that the impedance at resonance is minimum in series resonant circuit? 7. Explain how Q factor is related to bandwidth? 8. Explain the term Q factor? 9. Why a parallel resonant circuit is called a rejector circuit? 10. Compare series and parallel resonant circuit? 11. A choke coil of resistance of 5Ω, and inductance of 0.6H is connected in series with a capacitance 10µF.Calculate the resonant frequency? 12. In series LCR circuit the resonant frequency is 800Hz. The half power points are obtained at frequencies 745 and 855 Hz. Calculate the value of Q. 13. A series LCR circuit has Q=120 at resonance, a capacitance 200pF connected in series with an inductance of 150µH. Calculated its bandwidth?

8 Paper-2(Electronic Devices) UNIT-I DIODES AND TYPES OF DIODES 1. Explain the V-I characteristics of P-N Junction diode? Obtain diode equation for the current across the P-N junction? 2. Discuss the construction, working and application of Zener diode? 3. Explain the theory of P-N junction? 4. Explain the forward bias and Reverse bias conditions of a PN Junction diode? 5. Explain the V-I characteristics of a Tunnel Diode? 6. Explain the forward bias and Reverse bias conditions of a Tunnel Diode? 7. Write diode equation and discuss the effect of temperature on diode current? 8. Draw the circuit diagram to study the Zener diode characteristics? Mention its Applications? 9. Explain Junction Capacitance and Depletion Region of a P-N Junction diode? 10. Describe the Construction and working of a Varicap diode. Draw its V-I characteristics and explain? 11. Explain the working of Tunnel diode and Mention its Applications? 1. Explain how P-N junction is formed? 2. Explain the Varicap or Varactor Diode? 3. Calculate the forward bias current I of a Si PN Junction diode at room temp (V T =26mV), I 0 =20nA, forward bias voltage of 0.6 volts? 4. Discuss the cut-off, active and saturation regions of a transistor? 5. Find the forward current in Ge PN Junction diode at room temp (300 0 K) for a forward voltage V= 0.7 Volts and reverse saturation current I 0 =20µA? 6. Explain Zener and Avalanche breakdown mechanisms? 7. Explain the tunneling phenomenon? 8. Obtain Diode Equation? 9. How does reverse saturation current in a P-N junction diode vary with temperature? 10. Give different types of P-N Junction diodes and mention their applications? 11. Define Static and Dynamic resistances of a diode? 12. Write a short note on tunnel diode? UNIT-II BI-POLAR JUNCTION TRANSISTOR (BJT) & BIASING 1. Explain the working of NPN and PNP transistors? 2. Discuss the input and output characteristics of a CB transistors?

9 3. Explain the fixed bias arrangement for operating point stability and mention its demerits? 4. Define h-parameters of a transistor and explain how they are determined from transistor characteristics? 5. In a self bias arrangement of a CE transistor calculate the stability factor S with the following values β=100, R 1 =10KΩ, R 2 =20KΩ, R E =2KΩ. 6. Draw the circuit diagram of BJT in CE Configuration & Explain cut-off, active and saturation regions? 7. A transistor has α= 0.98, IB =100µA and I CO =6MA. Calculate I C and I E. 8. Explain the input and output characteristics of BJT CE Configuration? 9. Explain the input and output characteristics of CC Configuration? 10. Describe about various methods of transistor biasing. Give their merits and Demerits? 11. Draw the hybrid equivalent circuit of CE amplifier and derive its four hybrid parameters? 1. Define h-parameters. 2. Derive the relationship between α and β in a transistor? 3. In a CE transistor β=50, I B =100mA, I CEO =50µA.Calculate I C. 4. Explain AC load line? 5. Explain DC load line? 6. Explain hybrid model of a transistor? 7. What is a load line analysis? Explain its significance in biasing of a BJT? 8. Distinguish between PNP and NPN transistor? 9. Draw BJT static characteristics? 10. Define hybrid parameters of transistor? 11. Draw h parameter model for a transistor in CE configuration? 12. Explain various current components in a BJT? 13. What is fixed bias arrangement? 14. What is self bias arrangement? 15. Describe early effect? UNIT-III FIELD EFFECT TRANSISTOR (FET) & UNI JUNCTION TRANSISTOR 1. Explain the construction, working and characteristics of JFET? 2. Discuss the structure, working and characteristics of a UJT? 3. Explain the structure, working and characteristics of MOSFET? 4. Explain the construction and working of Enhancement and Depletion MOSFET s? 5. Mention the advantages of FET over transistor? 6. Define FET parameters and derive the relation between them? 7. Explain the static characteristics of UJT? 8. Draw the circuit diagram of UJT relaxation Oscillator and explain its Operation?

10 9. Explain the output and transfer characteristics of JFET? Mention how a JFET is superior to a BJT? 10. What is UJT? Describe the V-I characteristics of a UJT? 1. Distinguish between BJT and FET? 2. Explain FET parameters? 3. Derive the relation µ=r d g m? 4. A FET has an amplification factor µ 210 and transconductance gm 5m.Find its drain resistance? 5. Mention the advantages of FET over transistor? 6. Write short note on MOSFET? 7. Describe the V-I characteristics of a Uni junction transistor? 8. Draw the Schematic diagram of UJT and explain its working? 9. Distinguish between UJT and BJT? 10. Explain the working of UJT as relaxation oscillator? 11. Sketch the basic structure of P-channel JFET? 12. Describe the operation of JFET? UNIT-IV SILICON CONTROLLED RECTIFIER (SCR) & PHOTO ELECTRIC DEVICES 1. Draw the two transistor representation of an SCR and mention its applications? 2. Discuss how SCR is used for Power control? 3. Explain the structure and working of Photo transistor? 4. Explain the structure and operation of LDR? 5. Explain the theory of LED and its uses? 6. Describe an Experimental setup to obtain SCR Characteristics? 7. Explain the working of a photodiode and photo transistor? 8. Draw the Schematic diagram of SCR and explain its working? 9. Describe the construction and V-I characteristics of SCR? 10. Explain the characteristics and working of LED. Mention its applications? 1. Discuss the features of Photo Diode? 2. Explain the features of Photo voltaic cell? 3. Write briefly about LDR? 4. Discuss briefly about structure of SCR?

11 5. What is SCR? Give its symbol and two transistor representations? 6. Write short note on LED? 7. Draw the Schematic diagram of Photo voltaic cell and explain its working? 8. Describe the V-I characteristics of SCR? 9. Draw the two transistor representation of an SCR? 10. Write short note on Photo transistor?

Osmania University B.Sc Electronics - Syllabus (under CBCS w.e.f ) I ST and II nd Year

Osmania University B.Sc Electronics - Syllabus (under CBCS w.e.f 2016-2017) I ST and II nd Year UNIT - I B.Sc. ELECTRONICS SYLLABUS B.Sc. I YEAR Semester - I DSC- Paper I : Circuit Analysis Total number