ASSIGNMENT BOOKLET Bachelor's Degree Programme (B.Sc.) ELECTRICAL CIRCUITS AND ELECTRONICS. Please Note

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1 PHE-10 ASSIGNMENT BOOKLET Bachelor's Degree Programme (B.Sc.) ELECTRICAL CIRCUITS AND ELECTRONICS Valid from January 1, 2014 to December 31, 2014 It is compulsory to submit the Assignment before filling in the Term-End Examination Form. Please Note You can take electives (56 or 64 credits) from a minimum of TWO and a maximum of FOUR science disciplines, viz. Physics, Chemistry, Life Sciences and Mathematics. You can opt for elective courses worth a MINIMUM OF 8 CREDITS and a MAXIMUM OF 48 CREDITS from any of these four disciplines. At least 25% of the total credits that you register for in the elective courses from Life Sciences, Chemistry and Physics disciplines must be from the laboratory courses. For example, if you opt for a total of 64 credits of electives in these 3 disciplines, at least 16 credits out of those 64 credits should be from lab courses. You cannot appear in the Term-End Examination of any course without registering for the course. Otherwise, your result will not be declared and the responsibility will be yours. School of Sciences Indira Gandhi National Open University Maidan Garhi, New Delhi (2014)

2 Dear Student, We hope you are familiar with the system of evaluation to be followed for the Bachelor s Degree Programme. At this stage you may probably like to re-read the section on assignments in the Programme Guide for Elective Courses that we sent you after your enrolment. A weightage of 30 per cent, as you are aware, has been earmarked for continuous evaluation which would consist of one tutor-marked assignment (TMA) for this course. Submit your assignment response at your Study Centre. Instructions for Formatting Your Assignments Before attempting the assignment please read the following instructions carefully: 1) On top of the first page of your TMA answer sheet, please write the details exactly in the following format: ENROLMENT NO. : NAME : ADDRESS : COURSE CODE :.. COURSE TITLE :.. ASSIGNMENT NO. :. STUDY CENTRE :... DATE :.... PLEASE FOLLOW THE ABOVE FORMAT STRICTLY TO FACILITATE EVALUATION AND TO AVOID DELAY. 2) Use only foolscap size writing paper (but not of very thin variety) for writing your answers. 3) Leave 4 cm margin on the left, top and bottom of your answer sheet. 4) Your answers should be precise and in your own words. Do not copy answers from study material. 5) While solving problems, clearly indicate the question number along with the part being solved. Write units at each step of your calculations as done in the text because marks will be deducted for such mistakes. Take care of significant digits in your work. Recheck your work before submitting it. 6) This assignment will remain valid from January 1, 2014 to December 31, However, you are advised to submit it within 12 weeks of receiving this booklet to accomplish its purpose as a teachingtool. We strongly feel that you should retain a copy of your assignment response to avoid any unforeseen situation and append, if possible, a photocopy of this booklet with your response. You could obtain response to the difficulties you may face in PHE-10 course via by writing to sgokhale@ignou.ac.in. Please note that, we do not provide answers to Assignment questions. We wish you good luck. 2

3 Tutor Marked Assignment PHE-10: Electrical Circuits and Electronics Course Code: PHE-10 Assignement Code: PHE-10/TMA/2014 Max. Marks: 100 Note: Attempt all questions. Symbols have their usual meanings. The marks for each question are indicated against it. 1. State, with reasons, whether the following statements are True or False. (2 10) i) Thevenin s theorem is valid only for resistive networks. ii) Impedance matching is the necessary condition for proper operation of any electronic system. iii) In practical rectifier circuit, the peak amplitude of the output voltage is always smaller than the input peak amplitude. iv) If the gain of an amplifier is 50 db, its mid band gain equals 25 db. v) By using positive feedback, the gain of an amplifier can be stabilized. vi) CMRR of an op-amp determines its highest operating frequency. vii) 79XX series voltage regulator IC cannot provide output current more than 10 ma. viii) Only the decimal numbers divisible by 8 can be represented by octal system. ix) Truth table of a 3-input OR gate is same as that of a 3-input NAND gate. x) X and Y inputs of CRO can be used to directly measure the current flowing through a given circuit. 2. Using superposition principle obtain the voltage across the load resistance RL and the current flowing through it in the circuit given in Fig. 1. (8+2) 10 Ω 10 Ω 10 A + 10 Ω 25V R L = 5 Ω Fig a) Explain the statement Transisitor is a current controlled device while FET is a voltage controlled device. (5) 3

4 b) Calculate the resonance frequency, bandwidth and Q-factor of the circuit shown in Fig. 2. (5) AC Input 100 Ω 0.1 mh 1µF Fig a) In the universal biasing of a transistor, which resistor acts as a feedback element? How does it provide stability to the circuit? (1+4) b) Explain, how class B amplifier is more efficient than class A amplifier. What will be the effect on the output of a push-pull amplifier if unmatched transistors are used? (2+3) 5. a) Why LC oscillators are preferred over RC oscillators to generate high frequencies? Why 2-stage amplifier is required in Wein bridge oscillator in contrast to a single stage amplifier in the phase shift oscillator? (3+2) b) Design and draw a zener voltage regulator to provide 5V output if load resistance varies between 100 Ω and 500 Ω. Assume that the input unregulated dc voltage is 6V. (5) 6. Compare the operational amplifier with a class A common emitter amplifier on the basis of gain, bandwidth, input-output phase relationship, input impedance and output impedance. (10) 7. a) Draw the output waveform indicating proper scales on the time and voltage axes for the given input waveform to the circuit shown in Fig. 3. (5) V i 100 kω + 5V V t (s) V i 10 kω + 12 V + 12 V 10 kω 10 kω V out Fig. 3 b) Design and draw voltage regulator to provide 2 to 10V variable output voltage using IC (5) 4

5 8. a) Divide (BCD) by and express the result in octal equivalent. (5) b) Find the MSP expression for following relation and draw its logic gate implementation with minimum number of gates. Y = AC + AC ( B + C ) (5) 9. a) Explain the working of synchronous counter. (5) b) Discuss the use of signal generator circuits in the functioning of a CRO. (5) ***** 5

6 TENTATIVE SCHEDULE FOR PHYSICS PROGRAMMES BROADCAST ON GYAN DARSHAN 1 January 2014 December 2014 This is the tentative schedule for Physics students. The students may approach their cable operator to avail this facility. Date/Day Time Slot Course Code Video Programme Title January February March April May pm PHE-15 Glimpses of the Cosmos pm PHE-02 Simple Harmonic Motion pm PHE-15 Exploring the Night Sky am PHE-02 Dolan pm PHE-15 On the Trail of Stars am PHE-06 Second Law of Thermodynamics am PHE-02 Coupled Oscillations am PHE- 13 Introduction to Crystal Structure am PHE- 15 Astronomical Coordinates pm PHE- 10 Operational Amplifier am PHE- 06 Carnot Cycle pm PHE- 15 Astronomical Measurements (Measurement of Distance and Brightness) pm BPHE- 101 Rotating Frames of Reference pm PHE -15 Astronomical Measurements (Measurement of Mass, Temperature and Time) am PHE -10 Logic Gates 6

7 Date/Day Time Slot Course Code Video Programme Title July August pm PHE-04 Vector Calculus Part-I am BPHE-101 Exploring Physics: Experiments with Low cost Materials pm PHE-11 Matter Waves and the Uncertainty Principle pm PHE-11 Wave Particle Duality am BPHE-101 The Bicycle: A Vehicle for Teaching Physics am BPHE- 101 The Physics of Dance am PHE- 15 The Milky Way am PHE -04 Vector Calculus Part-II am PHE- 15 Stellar Spectra and Classification September am PHE- 10 Digital Modulation am PHE -10 Amplitude Modulation am PHE- 06 First Law of Thermodynamics October pm PHE-06 Applications of the First Law of Thermodynamics pm PHE-15 Stellar Structure November pm PHE-10 Transistor Biasing December pm PHE-06 Thermodynamics in Action am PHE-06 Ushmagatiki ke Anuprayog am PHE-10 Electronic Devices 7

8 TENTATIVE SCHEDULE FOR PHYSICS STUDENTS ON DD1 (National Network) (January 2014 to November 2014) Time: 6.00 AM to 6.30 AM Month/Date* Course Topic January February March April May July August September October November PHE-13 BPHE-101 PHE-15 PHE-10 PHE-15 PHE-10 PHE-02 PHE-10 PHE-06 PHE-15 * Second Monday of every month Introduction to Crystal Structure Ghurni Nirdesh Tantra (Hindi) The Milky Way Semiconductor Diode On the Trail of Stars Operational Amplifier Coupled Oscillations Transistor Configuration Thermodynamics in Action Exploring the Night Sky 8