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PHE-10 ASSIGNMENT BOOKLET Bachelor's Degree Programme (B.Sc.) Electrical Circuits and Electronics (Valid until June 30, 2008) School of Sciences Indira Gandhi National Open University Maidan Garhi, New Delhi-110068 2007-08 9 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 two tutor-marked assignments (TMA) for this course. 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 CODE: ………………….… 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 until June 30, 2008. However, you are advised to submit TMA-1 within 8 weeks and TMA-2 in 12 weeks of receiving this booklet to accomplish its purpose as a teaching-tool. We strongly recommend that you should retain a copy of your assignment response to avoid any unforeseen situation. If possible, please attach a photocopy of this assignment along with your response. You could obtain response to the difficulties you may face in PHE-10 course via e-mail by writing to [email protected]. Please note that, we do not provide answers to Assignment questions. We wish you good luck. 10 Tutor Marked Assignment-1 Electrical Circuits and Electronics Course Code: PHE-10 Assignment Code: PHE-10/TMA-1/2007-08 Max. Marks: 100 Note: This assignment is based on Blocks 1 and 2. Attempt all questions. Marks for each question are indicated against it. 1. State, with reasons, whether the following statements are True or False: i) ii) Transformer is a passive device hence it cannot boost voltage. Reciprocal network can be built using diode and transistors. iii) A frequency selective circuit (like filter) can be built by using combination of only resistors. iv) Practically it is impossible to have a resonant circuit with infinite Q. v) vi) Silicon can be doped with germanium to obtain p-type semiconductor. Centre tapped transformer is necessary for functioning of a bridge rectifier. vii) Amplifier with common collector mode offers maximum voltage gain. viii) A greater than unity results into sustained oscillations. 2. ix) High pass filter is used in voltage regulator circuit after rectifier stage. x) If two amplifiers of gain A1, and A2 are cascaded, the resultant gain is A1 + A2. a) Calculate the value of resistor R in the circuit shown in Fig. 1. (Three current values are shown with their directions of flow.) (210) (7) Fig. 1 b) In the practical current source shown in Fig. 2, Is = 10 A and Rs = 10 Ω. Convert this into a practical voltage source. Fig. 2 11 (3) 3. A series LCR circuit with L = 400 mH, C = 20 nF and R = 250 Ω is connected to an ac source of 65 V. Calculate the resonance frequency and Q of the circuit. What is the current flowing through the circuit and voltage across the capacitor at resonance frequency? (10) 4. a) b) 5. Design a band pass filter to pass the frequencies between 100 kHz and 200 kHz. Design and draw a circuit of a symmetrical lattice type attenuator to give attenuation of 20 dB and to have characteristic impedance of 200 Ω. (4) What are the major causes of charge carrier transport in uniformly doped n-type semiconductor? Explain in brief. (5) Calculate the value of load impedance at 100 Hz to achieve maximum power transfer from a source with 10 Ω resistance and 100 mH inductance. (5) Explain the basic difference between the construction and biasing of enhancementtype and depletion-type MOSFETs. (6) Draw the biasing circuit (indicting proper polarities) for a common collector amplifier using p-n-p transistor. (4) What is an operating point, Q of a transistor? How is a Q point for class A amplifier chosen? Why class C amplifier is not used in audio amplifiers? (5) b) Design and draw a circuit of a Colpitt’s oscillator to provide 100 kHz frequency. (5) a) Refer to the universal bias shown in Fig. 4.11(c), of your study material. If VCC = 20V, R1 = R2 = 20 kΩ, RC = 3 kΩ, RE = 5 kΩ, VBE = 0.7 V and = 50, calculate VB, VE, VC, IE, IB and VCE. (6) b) Explain the working of Wein bridge oscillator. (4) a) Design and draw a circuit of a transformer, rectifier and filter for providing 10V, 1A unregulated dc voltage from 220V ac supply. Mention the required turns ratio of the transformer; current ratings of primary and secondary windings; diode ratings and filter capacitor voltage rating. (6) Design a Zener voltage regulator to provide a 8V dc voltage with 1 A load current using a 10V unregulated dc supply designed in the above question. Specify the voltage and power ratings of all components used. (4) a) b) 6. a) b) 7. 8. 9. a) b) 12 (6) Tutor Marked Assignment-2 Electrical Circuits and Electronics Course Code: PHE-10 Assignment Code: PHE-10/TMA-2/2007-08 Max. Marks: 100 Note: This assignment is based on Blocks 3 and 4. Attempt all questions. Marks for each question are indicated against it. 1. State with reasons whether the following statements are true or false: i) ii) Op-Amp 741C has only five pins. An ideal Op-Amp has infinite voltage gain; this means that at the output we should get infinite voltage. iii) If the output voltage of an Op-Amp is not equal to its saturation voltage then the differential input voltage is zero. iv) v) In non inverting Op-Amp the closed loop gain can not be less than 1. IC LM380 is a small signal amplifier used to amplify the voltage. vi) Conversion of a two digit decimal number into its binary equivalent and BCD equivalent leads to the same binary digits. NAND and NOR gates are said to be the universal gates. vii) viii) In D-Flip flop, if both preset and clear terminals are zero state, we get “no change” state at the output. xi) Synchronous counters are faster than the ripple counters. x) In cathode ray tube electron beam deflection is caused by magnetic field. 2. a) b) c) (210) What is the difference between Input offset voltage and output offset voltage? Write their significance. (2+2) Draw and explain the ideal voltage transfer curve for an op-amp. Why is the output voltage always less than the supply voltage? (2+1) Trace the output waveform of the circuit given in Fig. 1(a) for the input waveform shown in Fig. 1(b) (3) +12 V vin (V) vin +5 vo 0 t (s) 10 kΩ -5 -12 V (a) (b) Fig.1 13 3. a) Explain the working of 4input inverting adder. In which condition will it work as an averaging amplifier? (2+1) b) In the amplifier circuit shown in Fig. 2; find out (i) the gain, (ii) output voltage, V0 and (iii) ouput current I0 (1+1+2) 80 kΩ +15 V IF vI=+1.5V 10 k Ω IO II vo IL 6 kΩ -15 V Fig. 2 c) 4. a) Design and draw the basic differentiator circuit with RC time constant 1s. Draw the output waveform for the input signal of V= 2 sin (10πt) with t expressed in second. Draw a circuit of variable gain amplifier using IC LM380 with a variable gain upto 50 for audio frequency. 5. (3) (2) b) Write down the importance of dropout voltage in a voltage regulator IC. Why the dropout voltage should not be too large in a voltage regulator IC? (2+1) c) Using IC LM317, design an adjustable voltage regulator for an output voltage of 2 to 10 V. If the dropout voltage and the ripple voltage for this IC is 3 V and 2 V, respectively, then what the minimum voltage that should be applied at the input to get 10 V output? (3+2) a) Write the ASCII code for Indian (2) b) What is the hex equivalent of 11001001001110011.11010112 (3) c) What is the BCD code of 83710 (2) d) Multiply 1110.112 by 11.012 (3) 14 6. a) Realise three input NOR gate using diodes and transistor. (3) b) Obtain a Boolean expression from the truth table given in Table 1. Simplify it and find the MSP expression. Realise this MSP expression using only NAND gates (1+3+3) Table: 1 A 0 0 0 0 1 1 1 1 7. a) B 0 0 1 1 0 0 1 1 C 0 1 0 1 0 1 0 1 Y 1 0 1 1 0 1 0 1 For the R and S inputs shown in Fig. 3, draw the output Q of an RS flip flop. (4) 1 S 0 1 R 0 Fig. 3 b) 8. a) b) c) 9. a) b) c) What do you mean by edge triggered flip-flop? Give the truth table for a positive edge triggered R-S flip-flop. What would be the output if the clock is absent? (6) Design a mod-6 ripple counter using J-K flop-flop. (3) What do you mean by RAM and ROM in semiconductor memories? Which of these are volatile and why? (2) A 4bit DAC produces 21 mV output for a digital input of 1110. What is the resolution for this DAC? Find out the Vout for 0101. (3+2) Show that, in a flux meter, deflection is directly proportional to a change in flux of the search coil. (3) What is meant by deflection sensitivity of a cathode ray tube? Obtain an expression for it. (3) What is meant by duty cycle of a pulse? If ON time of a pulse is 10 s and its time period is 25 s then find out its duty cycle. Is it a square wave? (1+2+1) 15 FEEDBACK ON “ELECTRICAL CIRCUITS AND ELECTRONICS” (PHE-10) Dear Student, We are under process of revising the course material of PHE-10. We hope that you are studying this material and are completing the assignment responses. We would like to get your feedback on this course while you are studying it. Since this material is specially developed for you, your suggestions will be highly appreciated and it will help us in the revision process. We request you to spend few extra minutes to fill the feedback questionnaire and send it to us. Please send this feed back questionnaire to: The Course Coordinator (PHE-10), School of Sciences, D-Block New Academic Complex, Indira Gandhi National Open University (IGNOU), New Delhi 110 068. HOWEVER, PLEASE SUBMIT YOUR ASSIGNMENT RESPONSES AT YOUR STUDY CENTRE. DO NOT SEND THEM WITH THIS QUESTIONNAIRE. We wish you all the very best. (Course Coordinator) PHE-10 1. Personal information a. Name : ……………………………………………………… c. Date of Birth: ………………………. b. Male / Female d. Enrolment Number : …..……………….. e. Address:………………………………………………………………………………. ………………………………………………………………………………………… f. E-mail:……………….……………… g. Tel. No:………………………………… h. Study Centre Code and Name:.…………………………..…………………………... i. Are you employed? YES/NO If yes, please specify the nature of the job…………………………………………..….. …………………………………………………….…………………………………….. j. You have access to computer at :- (a) Home- Yes/No (b)Friend’s home -Yes/No (c) Cyber Café –Yes/No (d)Study center Yes/No. [Put tick mark () at each Yes/No] 16 2. Delivery Mechanism a) Are the counseling sessions for PHE-10 arranged at your study centre? YES/NO If Yes, how many?………………………………………………………………… b) Do you attend counseling session of PHE-10 held at your study centre? YES/NO If Yes, do you find these sessions useful? YES/NO If No, state the reasons…….………………………………………………………… ……………………………………………………………………………………… c) Are the number of sessions adequate? YES/NO If No, how many sessions do you expect?................................................................... 3. Multimedia in Learning a) Would you prefer teleconference mode of counseling over face-to-face counseling at the Study Centers? YES/NO Explain why...….………………………………………………………………… ….………….……………………………………………………………………… b) Will it be possible for you to attend the teleconferencing session on weekdays? YES/NO Any preferred timings?…………………………………………………………… c) Give your suggestions about using multimedia facilities for IGNOU course delivery. (Use additional pages if you answer is long.) ……………………………………………………………………………………… ……………………………………………………………………………………… d) Do you use computer during your studies? YES/NO If yes, specify the purpose. .....…………………………………………………………………………………… …………………………………………………………………………………… Which software packages do you use? ……………………………………………………………………………………… ……………………………………………………………………………………… 4. Please fill in the enclosed Table for unit-wise feedback. You may like to read the instructions given above the Table before starting to fill up the Table. 17 Unit-wise feedback for PHE-10 Note: Please tell us about your difficulties in studying each of the units. To describe your response, you may put an appropriate number from 1 to 8 below in each cell regarding different aspects of a unit. The name of unit is given in each row. Choose a number closest to your view: Not clear (1); Not sufficient (2); Difficult (3); Not relevant (4); Not interesting (5); Satisfactory (6); Understandable (7); Excellent (8). In the last column, you have to mention the approximate time you have taken to study each Unit. Please make sure that you have filled in all the 104 cells. Unit Explanation of Concepts Examples given Language used Mathematics used 1. Circuit Analysis 2. DC and AC Circuits 3. Electron Devices 4. Amplifiers 5. Oscillators 6. Power Supply 7. Operational Amplifier 8. Application of Operational Amplifiers 9. Linear ICs-Amplifiers and Voltage Regulators 10. Number System and Codes 11. Fundamentals of Boolean Algebra and Flip Flops 12. Registers, Counters, Memory Circuits and A/D Converters 13. Electronic Instruments 18 Figures Tables SAQs and Terminal Questions Time taken to study the unit (min./h.) 5. If you have filled numbers 1 to 5 in any of the cells of the above Table, please write your suggestions/problems for that specific aspect of the concerned unit. (Use additional pages if need be). ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… 6. What (e.g., explanations, diagrams, examples, definitions, etc.) would you like to be added or deleted in the units to make it easier to study? (Use additional pages if your answer is long). ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… 7. Give your suggestions about any new concepts/topics to be introduced in this course. Also mention if you would like to delete any topic with reason. (Use additional pages if your answer is long). ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… **************