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SAMPLE QUESTION PAPERS ELECTRONICS -...
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Government of Kerala Department of Education Prepared by State Council of Educational Research and Training (SCERT), Kerala 2015 Class - XII SAMPLE QUESTION PAPERS ELECTRONICS
Transcript of SAMPLE QUESTION PAPERS ELECTRONICS -...
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Government of KeralaDepartment of Education
Prepared byState Council of Educational Research and Training (SCERT), Kerala
2015
Class - XII
SAMPLE QUESTION PAPERS
ELECTRONICS
2
Guidelines for the Preparation of Question Paper forHIGHER SECONDARY EDUCATION 2015-16
IntroductionTerm evaluation is an important aspect of Continuous and Comprehensive Evaluation (CCE).It covers the assessment of learning aspect of the CCE. The Kerala School Curriculum 2013postulated that the examination system should be recast so as to ensure a method of assessmentthat is a valid, reliable and objective measure of student development and a powerfulinstrument for improving the learning process. The outcome focused written tests are beingused as tools for terminal assessment. Practical assessment is also considered for somesubjects. The syllabus, scheme of work, textual materials, teacher texts and learningexperiences may be considered while developing tools for term evaluation.In order to make the examination system effective and objective, quality of the question paperneeds to be ensured. Questions of different types considering various learning outcomes,thinking skills and of varying difficulty levels are to be included in the question paper. Thismakes question paper setting a significant task that has to be undertaken with the support ofproper guidelines.The guidelines for the preparation of the question paper have been divided into four headsfor its effective implementation and monitoring. The areas are i) preparatory stage, ii) natureof questions, iii) question paper setting and iv) structure of the question paper.
I. Preparatory stageBefore starting the process of question paper setting, the question paper setter shouldensure that she/he has:
Familiarised the current syllabus and textbook of the concerned subject. secured the list of LOs (Learning Outcomes) relating to the subject. acquired the list of thinking skills applicable to the subject. prepared a pool of questions from each unit of the subject. verified the scheme of work and weight of score for each unit/lesson. gone through guidelines for the preparation of question paper for higher secondary
education 2015-16.
II Nature of questionsQuestions selected from the pool to be included in the question paper should reflect thefollowing features:
stem of the question text should be relevant to the question posed. multiple choice questions should be provided with four competitive distracters. the possibilities of higher order thinking skills should be considered while setting
MCQs time allotted for each question should be justified according to the thinking skills
involved. the scope and length of the answer should be clearly indicated.
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questions should be prepared by considering the learning level of the learner. the question should focus on the learning outcomes. a wide range of thinking skills and learning outcomes from each unit/lesson
should be considered. varied forms of questions should be covered. there should be a balance between the time allotted and the level of question. question should be very specific and free from ambiguity. question text should not be too lengthy and complicated. questions can be prepared based on a single or a cluster of learning outcomes
which is scattered over one particular unit or units. cluster of learning outcomes from different units can be considered only for graded
questions (questions with sub-divisions). the possibilities of graded questions reflecting different thinking skills can be explored. while preparing questions for language papers importance should be given to the
language elements, language skills, discourses, textual content and elements ofcreativity.
while preparing questions for subjects other than languages, importance should begiven to content, concepts and skills.
questions should cater the needs of differently abled learners and CWSEN(Children With Special Education Needs)
the questions should contain varied forms such as objective type with specificfocus to multiple choice test items and descriptive types (short answer and essaytypes).
directions regarding the minimum word limit for essay type questions should be given. sufficient hints can be provided for essay type questions, if necessary. maximum usage of supporting items like pictures, graphs, tables and collage may
be used while preparing questions. questions which hurt the feelings of caste, religion, gender, etc. must be completely
avoided.
III. Question paper settingDuring the process of question paper setting the question setter should:
prepare a design of the question paper with due weight to content, learningoutcomes, different forms of questions and thinking skills.
prepare a blue print based on the design. prepare scoring key indicating value points and question based analysis along
with the question paper. while preparing scoring key, thinking skills should also be integrated. 60% weight should be given to thinking skills for conceptual attainment and 40% to
thinking skills for conceptual generation. 15 to 20% weight of total scores must be given to objective type questions and up
to 20% weight of total score must be given to essay type questions.
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the highest score that can be given to a question in the question paper is limited to10% of the total score.
while fixing the time for answering a question, time for reading, comprehendingand writing the answer must be considered.
The total time limit of the question paper - two hours for 60 scores and 2.30 hoursfor 80 scores question papers with an extra cool-off time of 15 minutes.
IV. Structure of the question paperThe question paper should reflect the following features in general:
general instructions for the question paper should be given on the top. instructions for specific questions can be given before the question text. monotony of set patterns (objective or descriptive) should be avoided. questions should be prepared in bilingual form. there should not be any mismatch between the bilingual versions of the questions. choice can be given for questions up to 20% of the total score. while giving choice, alternative questions should be from the same unit with the
same level of thinking skills. in the case of languages, language of the questions and answers should be in the
particular language concerned. Necessary directions in this regard must be givenin the question paper.
THINKING SKILLSCategory/ Alternative termsprocesses
1. Remember Retrieve relevant knowledge from long-term memory1.1. Recognising identifying- (e.g. Recognize the dates of important events in Indian
history)1.2. Recalling retrieving - (e.g. Recall the major exports of India)2. Understand Construct meaning from instructional messages, including oral,
written and graphic information2.1. Interpreting clarifying, paraphrasing, representing, translating (e.g. Write an
equation [using B for the number of boys and G for the number ofgirls] that corresponds to the statement ‘There are twice as many boysas girls in this class’)
2.2. Exemplifying illustrating, instantiating (e.g. Locate an inorganic compound and tellwhy it is inorganic)
2.3. Classifying categorizing, subsuming (e.g. Classify the given transactions to berecorded in Purchase returns book and Sales returns book)
2.4. Summarising abstracting, generalizing (e.g. Students are asked to read an untitledpassage and then write an appropriate title.)
2.5. Inferring concluding, extrapolating, interpolating, predicting (e.g. a studentmay be given three physics problems, two involving one principle
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and another involving a different principle and ask to state theunderlying principle or concept the student is using to arrive at thecorrect answer.)
2.6. Comparing contrasting, mapping, matching (e.g. Compare historical events tocontemporary situations)
2.7. Explaining constructing models (e.g. the students who have studied Ohm’s laware asked to explain what happens to the rate of the current when asecond battery is added to a circuit.)
3. Apply Carry out or use a procedure in a given situation3.1. Executing Carrying out (e.g. Prepare Trading and Profit and loss Account from
the Trial Balance given and find out the net profit.)3.2. Implementing using (e.g. Select the appropriate given situation where Newton’s
Second Law can be used)4. Analyse Break material into its constituent parts and determines how the
parts relate to one another and to an overall structure or purpose4.1. Differentiating discriminating, distinguishing, focusing, selecting (e.g. distinguish
between relevant and irrelevant numbers in a mathematical wordproblem)
4.2. Organising finding coherence, integrating, outlining, parsing, structuring (e.g. thestudents are asked to write graphic hierarchies best corresponds tothe organisation of a presented passage.)
4.3. Attributing deconstructing (e.g. determine the point of view of the author of anessay in terms of his or her ethical perspective)
5. Evaluate Make judgements based on criteria and standards5.1. Checking coordinating, detecting, monitoring, testing (e.g. after reading a report
of a chemistry experiment, determine whether or not the conclusionfollows from the results of the experiment.)
5.2. Critiquing judging (e.g. Judge which of the two methods is the best way to solvea given problem)
6. Create Put elements together to form a coherent or functional whole;reorganize elements into a new pattern or structure
6.1. Generating hypothesizing (e.g. suggest as many ways as you can to assure thateveryone has adequate medical insurance)
6.2. Planning designing (e.g. design social intervention programmes forovercoming excessive consumerism)
6.3. Producing constructing (e.g. the students are asked to write a short story basedon some specifications)
Considering the intellectual level of learners, while setting the question paper;1. 60% weight may be given to thinking skills used for factual and conceptual
attainment and2. 40% weight may be given to thinking skills for conceptual generation (higher thinking
skills has to be ensured in this category). Thinking skills for conceptual generationmeans thinking skills needed for elaborating the concepts.Refer the range of thinking skills given above. We can include the thinking skills no.1.1to 3.2 (11 processes) under first category and 4.1 to 6.3 (8 processes) under secondcategory.
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Guidelines for setting Question Paper - ELECTRONICS
1. Multi level questions should be promoted.2. The weight of objective questions should be between 15%-20% of Total score and it
should carry one score3. The weight of essay question should be between 15%-20% of Total score and it should
carry four or five scores4. The short answer question should carry two or three scores.5. The content/problems given as box item in the SCERT text book should not be
used for term end evaluation.6. Derivation should be included for 20%- 25% of Total score.7. Numerical problems should be included for 15%- 20% of Total score.8. Graph, diagrams and pictures should be included in the questions wherever
necessary.9. Specific hints should be included in the questions if needed.
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After completing this unit, the learner :POWER SUPPLIES AND VOLTAGE STABILISERS
1.1. explains the need of regulated power supply1.2. explains the basic principles of series and shunt voltage regulators1.3. sketches the circuit diagrams of fixed voltage regulators1.4. identifies various IC voltage regulators1.5. designs and constructs a power supply
WAVESHAPING CIRCUITS2.1. explains different types of clipping circuits.2.2. demonstrates the working of clamping circuits.2.3. sketches the input and output waveforms of RC differentiator and integrator.2.4. identifies different types of RC filter circuits2.5. explains the working of different types of filters.2.6. sketches the circuit diagram of buffer, adder and subtractor using op-amps.2.7. explains the working of comparator and its applications.
DIGITAL ELECTRONICS3.1. explains the difference between combinational and sequential circuits.3.2. demonstrates the operation of multiplexer and demultiplexer.3.3. sketches the circuit of them.3.4. explains the operation of encoder and decoder.3.5. designs and set up a one bit comparator.3.6. explains the operation of the basic flip flops.3.7. sketches the circuit and prepares the truth table of these flip flops.3.8. explains the operation of a counter.3.9. sketches the circuit of a shift register with D FFs.3.10. explains the types of shift registers.
RADIO BROADCASTING4.1. identifies the need for modulation.4.2. explains the concept of AM.4.3. explains the concepts of spectrum, bandwidth and power of AM.4.4. explains the operation of AM generator and AM demodulation.4.5. explains FM.4.6. sketches the spectrum of FM4.7. describes the noise immunity of FM4.8. compares the performance of AM and FM.4.9. explains the operation of TRF receivers.4.10. explains the merit of superheterodyne receiver.
LEARNING OUTCOMES (Electronics)
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COMMUNICATION SYSTEMS5.1. explains the origin and history of development of communication system.5.2. points out the allocation of different frequency bands.5.3. explains the invention of radio waves and its propagation.5.4. points out the differences between long, medium and short wave propagation.5.5. differentiates ground wave and sky wave.5.6. identifies the different layers of Ionosphere.5.7. explains critical frequency and maximum usable frequency.
DATA COMMUNICATION6.1. explains the difference between continuous modulation and pulse modulation.6.2. describes the concept of sampling.6.3. explains the differences between PAM, PCM,PWM and PPM.6.4. explains the need for multiplexing.6.5. describes the concept and difference between TDM and FDM.6.6. demonstrates various digital modulation.6.7. explains different modulation schemes such as ASK, FSK, and PSK
OPTICAL FIBER AND SATELLITE COMMUNICATION7.1. points out the advantages of optical fiber communication system7.2. classifies optical fibers7.3. explains the structure of optical fiber cable and light propagation in optical
fibers7.4. explains the advantages of optical fiber communication7.5. differentiates various types of fiber optic cables7.6. describes the light phenomena like reflection and refraction7.7. describes the features of different light sources used in optical fiber
communication7.8. describes the block diagram of an optical communication system7.9. explains light detection in optical fibers7.10. explains the principles of satellite communication7.11. calculates the orbital velocity and time period of a satellite7.12. derives the relationship between orbital radius and time period7.13. points out various satellites launched by India.
TELEVISION8.1. explains the history and development of TV systems.8.2. explains the scanning process of television picture.8.3. explains the bandwidth of TV transmission.8.4. draws the block diagram and thereby explains the working of monochrome TV
receiver.8.5. identifies the basics of colour TV.
9
8.6. explains additive colour mixing.8.7. explains the reception process of dish antenna.8.8. points out the uses of co-axial cable.8.9. explains the arrangement of cable TV network.
FUNDAMENTALS OF COMPUTERS9.1. sketches the block diagram of a computer and explains its structure.9.2. explains the functions of various input and output devices.9.3. differentiates various printing technologies.9.4. identifies various units of memory storage.9.5. explains the characteristics of primary memory.9.6. explains the characteristics of different secondary storage devices.9.7. distinguishes between static and dynamic RAM.9.8. classifies computers on the basis of speed and computing power.9.9. explains the functions and structure of motherboard.9.10. identifies different computer ports.9.11. classifies computer softwares.9.12. explains various system and application softwares.9.13. differentiates various computer languages.
INTERNET TECHNOLOGY10.1. explains the needs and advantages of computer networking10.2. differentiates different network protocols10.3. compares different data communication devices10.4. explains the functions of MODEM10.5. identifies different network topologies10.6. differentiates different types of networks10.7. identifies domain names and IP addresses10.8. explains the concept of client/ server computing
BASICS OF TELEPHONE COMMUNICATION11.1. explains the need of PSTN11.2. sketches the structure of PSTN11.3. identifies different switching offices11.4. differentiates centralized SPC and distributed SPC11.5. describes how cell system is a spectrum efficient system11.6. explains the concept of frequency reuse11.7. points out the requirements for a multiple access11.8. differentiates TDMA,FDMA and CDMA11.9. explains GSM11.10. explains the working of GPS11.11. explains GPRS technology.
10
No. Thniking Skills Score Percentage
1 For Conceptual Attainment 36 602 For Conceptual Generation 24 40
Total 60 100
WEIGHT TO THINKING SKILLS
No. Type No. of Questions Score Percentage
1 Objective 17 17 282 Short Answer 14 31 523 Essay 4 12 20
Total 35 60 100
WEIGHT TO FORM OF QUESTIONS
WEIGHT TO CONTENT & LEARNING OUTCOMES
Sl. Content/ Unit LO. No. % ScoreNo.
1. Power Supplies and Voltage Stabilisers 1.1, 1.2 6.72. Digital Electronics 3.3, 3.5 10
(OR) Question 3.6, 3.7 (OR) (10)3. Optical fiber and satellite communications 7.1,7.3
7.7,7.9 104. Television 8.2, 8.3 105. Fundamentals of computers 9.2, 9.3 56. Internet technology 10.1, 10.3,10.4 6.77. Basics of telephone communication 11.2, 11.8 13.38. Data communiation 6.2, 4 109. Radio broadcasting 4.1, 4.2, 4.3 8.310. Communication systems 5.2, 5.5, 5.6,5.7 1011. Waveshping circuits 2.4, 2.3 10
Total 60 100
11
Thinking skills for Thinking skills forConceptual attainment Conceptual Generation
Unit Objective Short Answer Essay Objective Short Answer Essay Total1 1 (1) 3 (1) 4 (2)2 1 (2) 2 (1) 2 (1) 6 (4)3 1 (1) 2 (1) 3 (1) 6 (3)4 1 (1) 2 (1) 3(1) 6 (3)5 1 (1) 2 (1) 3 (3)6 1 (2) 2 (1) 4 (3)7 1 (1) 2 (1) 2 (1) 3 (1) 8 (4)8 1 (3) 3 (1) 6 (4)9 1(1) 1 (1) 3(1) 5 (2)10 1 (2) 2(2) 6 (4)11 1 (1) 2 (1) 3 (1) 6 (3)
Total 16 (16) 14 (7) 6 (2) 1(1) 17 (7) 6 (2) 60 (35)
BLUE PRINT
1. A regulated power supply is quiteessential in electronic circuits.(a) .......diode is commonly used in a
voltage regulator (zener diode,ordinary diode, photodiode, PINdiode) (1)
(b) Draw the block diagram of aregulated power supply unit (3)
2. A digital comparator circuit is used tocompare two data in microprocessors.This circuit is designed using logicalgates.
General Instructions to candidates:• There is a 'Cool off time' of 15 minutes in addition to the writing time of 2 h.• You are neither allowed to write your answers nor to discuss anything with others during the 'cool off time'.• Use the 'cool off time' to get familiar with questions and to plan your answers.• Read the questions carefully before answering• All questions are compulsory and only internal choice is allowed.• When you select a question, all the sub-questions must be answered from the same question itself.• Calculations, figures and graphs should be shown in the answer sheet itself.• Malayalam version of the questions is also provided.• Give equations wherever necessary• Electronics devices except nonprogrammable calculators are not allowed in the Examination Hall.s]mXp-\n¿t±-i-߃
• \n¿±njvS ka-b-Øn\v ]pdsa 15 an\n v́ "Iqƒ Hm v̂ ssSw' D≠m-bn-cn-°pw. Cu ka-bØv tNmZy-߃°vDØcw Fgp-Xmt\m, a‰p-≈-hcp-ambn Bibw hn\n-abw \S-Ømt\m ]mSn-√.
• DØ-c-߃ Fgp-Xp-∂-Xn\v apºv tNmZy-߃ {i≤m-]q¿Δw hmbn-°-Ww.
• F√m tNmZy-߃°pw DØcw Fgp-X-Ww.
• Hcp tNmZy-\-º¿ DØ-c-sa-gp-Xm≥ sXsc-s™-SpØv Ign-™m¬ D]-tNm-Zy-ßfpw AtX tNmZy-\-º-cn¬ \n∂v Xs∂ sXsc-s™-Sp-t°-≠-Xm-Wv.
• IW°v Iq -́ep-Iƒ, Nn{X-߃, {Km^p-Iƒ, F∂nh DØ-c-t]-∏-dn¬Øs∂ D≠m-bn-cn-°-Ww.
• tNmZy-߃ ae-bm-f-Ønepw \¬In-bn-́ p-≠v.
• Bh-iy-ap≈ ÿeØv ka-hm-Iy-߃ sImSp-°Ww
• t{]m{Km-ap-Iƒ sNøm-\m-ImØ Im¬°p-te-‰-dp-Iƒ Hgn-sI-bp≈ Hcp Ce-Ivt{Sm-WnIv D]-I-c-Whpw
]co-£m-lm-fn¬ D]-tbm-Kn-°m≥ ]mSn-√.
F.Y.March 2016
Reg. No: ..........................................
Name : ..........................................Part - III
ELECTRONICSMaximum : 60 Scores
Time: 2hCool off time : 15 Minutes
SET- 1
1. Ce-Ivt{Sm-WnIv k¿°-yq-́ p-I-fn¬ D]tbmKn-
°p∂ ]h¿ kssπ sdKp-te-‰Uv B th≠Xv
AX-y-¥m-t]-£n-X-am-Wv.
(a) thmƒt´Pv sdKp-te-‰dn¬ km[m-c-W-
bmbn D]-tbm-Kn-°p-∂-Xv... -U-tbmUv
BWv (1)
(sk\¿ Utbm-Uv, Hm¿Un-\dn Utbm-
Uv, t^mt´m-U-tbm-Uv, ]n≥ Utbm-Uv)
(b) Hcp sdKp-te-‰Uv ]h¿ kssπ-bpsS
tªm°v Ub{Kw hc-bv°p-I. (3)
2. temPn°v tK‰p-Iƒ sIm≠p-≠m-°p∂ UnPn-‰n¬ Iº-td-‰¿ k¿°yq´v D]-tbm-Kn-®mWvssat{Im s{]mk- -dp-I-fn¬ c≠v Um‰sb
Xmc-X-ayw sNøp-∂-Xv.
13
a) If A and B are two bits, .......logicalgate is used to compare if they areequal or not. (1)
(b) Write the truth table for the abovegate. (2)
(c) Draw a 1-bit comparator circuit (3)
OR
2. (a) .......is a digital circuit used to routeinformation from several lines intoa single line. (1)
(b) Draw the truth table for acombinational logic circuit totransmit 4 data inputs into a singleoutput ( 2)
(c) Realize the above circuit usingbasic logic gates (3)
3. Now a days, optical fiber communication is widely used for long distancecommunication such as telephones.(a) In optical fiber communication
system, electrical signals areconverted into light using.........(Photodiode, laser diode,phototransistor, APD) (1)
(b) Explain the advantages of usingoptical fiber cables instead ofcopper cables in communication.
(2)(c) A PIN photodiode is a better light
detector than a pn photodiode.Why? (3)
(d) Draw the structure of an OFC. (2)4. (a) In Indian TV system (625 line TV
system) .........scanning is used(Progressive scanning, interlacedscanning, document scanning,none) (1)
(a) A, B F∂o _n‰p-Iƒ Xpe-y-amtWm
A√tbm F∂v Xmc-X-ayw sNøm≥
......temPn-°¬ tK‰v D]-tbm-Kn-°p-∂p.
(1)
(b) ta¬∏-d™ tK‰ns‚ {SqØv tS_nƒ
Fgp-Xp-I. (2)
(c) Hcp 1˛_n‰v Iº-td-‰¿ k¿I-yq v́ hc-°pI.
(3)
OR2 (a) hnh-c-ßsf ]e sse\p-I-fn¬ \n∂v
Hscm‰ sse\n-te°v dq´p sNøp-∂-Xn\v
D]-b-Kn-°p∂ UnPn-‰¬ k¿Iyq v́ ............
BWv. (1)
(b) 4 tU‰m C≥]p-́ p-Isf Hscm‰ Hu v́]p v́
B°p-∂-Xn-\p≈ tImºn-t\-j-W¬
temPnIv k¿Iyq-´ns‚ {SqØv tS_nƒ
hc-bv°p-I. (2)
(c) apI-fn¬ ]d™ k¿Iyq-´ns\ ASn-
ÿm\ temPnIv tK‰p-Iƒ D]-tbm-Kn®v
bmYm¿∞y-am-°p-I. (3)
3. sSen-t^m¨t]m-ep≈ Zo¿L-Zqc IΩ-yq-Wn-
t°-j-\p-I-fn¬ H]v‰n-°¬ ss^_-dmWv
Ct∏mƒ IqSp-X-embn D]-tbm-Kn-°p-∂-Xv.
(a) H]v‰n-°¬ ss^_¿ IΩ-yq-Wn-t°-j-\n¬
Ce-Iv{Sn°v kn·-ep-I-sf sse‰v kn·-
epIfm-°p-∂-Xn-\mbn ..................... D]-tbm-
Kn-°p-∂p. (t^mt´mUtbm-Uv, tek¿
Utbm-Uv, t^mt´m-{Sm≥kn-ÿ, APD)(1)
(b) tIm∏¿ tI_n-fp-Iƒ°v ]Icw Hm]v‰n-
°¬ ss^_¿ tI_n-fp-Iƒ D]-tbm-Kn-
°p-∂-Xns‚ t\ -́߃ hni-Zo-I-cn-°pI.
(2)
(c) P-N t^mt´m-U-tbm-Un-s\-°mfpw anI®
sse‰v Un‰-IvS¿ BWv PIN t^mt´mU-
tbmUv, Imc-W-sa¥v? (3)
(d)Hcp H]v‰n-°¬ ss^_¿ tI_n-fns‚
LS\ hc-bv°pI (2)
4. (a) C¥-y≥ Sn.hn knÃ-Øn¬ (625 sse≥
knÃw) .............kvIm\nwKv BWv D]-tbm-
Kn-°p-∂-Xv. (t{]m{K-kohv kvIm\nw-Kv,
C‚¿sebvkvUv kvIm\nw-Kv, tUmI-yp-
sa‚ v kvIm\nw-Kv, Ch-sbm-∂p-a-√.) (1)
14
(b) .......modulation is used for picturesignals in TV transmission. (DSB,SSB, SSB-SC, VSB) (1)
(c) A complete TV channel, occupies abandwidth of ....for transmission
(1)(d) To avoid flickering, frame rate has
to be increased. But this increasesthe bandwidth requirements in TVtransmission. Suggest a method toavoid flicker without increasingbandwidth. (3)
5. (a) .....is a device used to get ahardcopy output from a computer(keyboard, printer, mouse, RAM)
(1)(b) A laser printer provides a better
quality output when compared toa dot matrix printer. With the helpof diagram, explain the working oflaser printer. (3)
(c) ......memory is the fastest memoryin computer (cache, primarymemory, secondary memory,none) (1)
6. (a) Networking between computersprovides us with severaladvantages. Mention any fouradvantages. (2)
(b) ......is a hardware component thatallows a computer to get connectedto the network. (1)
(c) Web pages are designed using.....(C, C++, HTML, FORTRAN) (1)
(d) Modems are essential forcommunication between twocomputers in internet. Explain.
(2)7. (a) A subscriber's telephone set is
connected to the end office using...
(b) Sn.hn. {Sm≥kvan-j-\n¬ ]nIvN-dp-Iƒ°p
th≠n..... -tam-Up-te-j≥ D]-tbm-Kn-
°p∂p. (DSB, SSB, SSB-SC, VSB) (1)
(c) Hcp apgp-h≥ Sn.hn. Nm\-ens‚ {Sm≥kvan-
j-\p-th≠n ......._m≥Uv hnUvØv Bh-
i-y-am-Wv. (1)
(d) Sn.hn-bn¬ ̂ vfn°-dnwKv Hgn-hm-°p-∂-Xn\v
s{^bnw td‰v Iqt -́≠-Xmbn hcpw.-]t£
CXv _m‚ vhnUvØv Iq´pw. F∂m¬
_m‚ vhnUvØv Iq´msX ̂ vfn°-dnwKv Hgn-
hm-°p-∂-Xn-\p≈ Hcp coXn hni-Z-am-°p-
I. (3)
5. (a) Hcp Iº-yq-́ -dn¬ \n∂pw lm¿UvtIm∏n
In´p-∂-Xn-\mbn ..........D]-tbm-Kn-°p-∂p.
(Iot_m¿Uv, {]n‚¿, aukv, dmw) (1)(b) Hcp tUm v́sa{SnIvkv {]n‚dns\ At]-
£n®v tek¿ {]n‚¿ anI® Izm-fn‰n
Hu v́]p v́ Xcp-∂p. Hcp tek¿ {]n‚dns‚
{]h¿Ø\w Ub-{K-Øns‚ klm-b-
tØmsS hni-Zo-I-cn-°p-I. (3)
(c) Iº-yq-́ -dnse G‰hpw thK-X-bp≈ saΩ-
dn.........-B-Ip-∂p.
(ImjvsaΩ-dn, ss{]adn saΩ-dn,
sk°≥Udn saΩ-dn Ch-sbm-∂p-a√.)
(1)
6. (a) Iº-yq-́ -dp-I-fpsS s\‰v h¿°nwKv sIm≠v
hf-sc-b-[nIw t\ -́ß-fp-≠v. GsX-¶nepw
\mev t\ -́ß-sf-gp-Xp-I. (2)
(b) Hcp Iº-yq-´-dns\ s\‰v h¿°p-ambn
_‘n-∏n-°p-∂-Xv.......... -lm¿Uvshb¿
Itºm-W‚ v BWv. (1)
(c) Hcp sh_v t]Pp≠m°m≥..................-D-]-
tbm-Kn-°p-∂p.
(C, C++, HTML, FORTRAN) (1)
(d) C‚¿s\‰nse c≠v Iº-yq -´ -dp -Iƒ
XΩn¬ IΩ-yq-Wn-t°‰v sNøp-∂-Xn\v
tamUw AX-ym-h-i-y-am-W.v hni-Z--am-°pI.
(2)
7. (a) Hcp k_vkvss{I-_-dpsS sSen-t^m¨
F≥Uv Hm^o-kp-ambn _‘n-∏n-°p-∂-
Xn-\m-bn.......-D-]-tbm-Kn-°p-∂p.
15
(a) Trunk (b) Intertoll trunks (c) localloops (d) coaxial cable (1)
(b) Distinguish between TDMA andFDMA technologies (3)
(c) Mention the advantages of CDMAover TDMA and FDMA (2)
8. a) Sampling theorem states that if fmis the maximum signal frequencythe sampling frequency must begreater than or equal to ......(fm, 2 fm, 3 fm, 4 fm) (1)
b) Sampling enables us to convert ananalog signal into digital signal.Explain how this is possible? (2)
(c) Sampled values are converted tothe nearest predetermined levelusing the process of.............. (1)
9. (a) .....helps us to transmit lowfrequency audio signals over longdistances.
(modulation, demodulation,multiplexing, demultiplexing (1)
(b) Modulation is a kind of frequencytranslation. With reference toamplitude modulation, explainhow is this possible? (3)
(c) With the help of mathematicalexpression draw the frequencyspectrum of AM wave. (2
10. a) TV signals are propagated overlong distances by means of....Propagation (ground wave,skywave, space wave, none) (1)
b) Explain the significance ofionospheric layer in radio wavepropagation. (2)
11. (a) ...................is a circuit used to select
({S¶v, C‚¿tSmƒ{S-¶v, tem°¬ eq∏v,
tImbm-Ivkn-b¬ tI_nƒ) (1)
(b) TDMA, FDMA sSIvt\m-f-Pn-Iƒ XΩn-
ep≈ hy-X-ym-k-߃ Fgp-Xp-I. (3)
(c) TDMA, FDMA F∂n-hsb At]-£n®v
CDMA bpsS t\ -́ß-sf-gp-Xp-I. (2)
8. (a) amIvknaw kn·¬ {^oIz≥kn fmBsW-¶n¬ kmwπnwKv Xnbdw {]Imcw
kmwπnwKv {^oI-z≥kn kn·-ens‚
amIvknaw {^oI-z≥kn-bpsS F{X-a-S-
ßn¬ IqSp-X-em-bn-cn-°Ww?
(fm, 2 fm, 3 fm, 4 fm) (1)(b) Hcp A\temKv kn·-ens\ UnPn-‰¬
kn·-em-°p-∂-Xn\v kmwπnwKv Bh-i-y-
am-Wv. CsX-ß-s\-bmWv hni-Zo-I-cn-
°pI. (2)
(c) kmw]nƒUv hme-yq -kns\ ap≥Iq´n
Xøm-dm-°nb Af-hp-I-fpsS G‰hpw
ASpØ hne-bn-te°v am‰p∂ {]{In-b......-
F-∂-dn-b-s∏-Sp-∂p. (1)
9. (a) Xmgv∂ {^oI-z≥kn-bn-ep≈ i_vZ kn·-
ep-Isf hfsc Zqtc°v Ab-°p-∂-Xn-
\v........-D-]-tbm-Kn-°p∂p (1)
(tamUp-te-j≥, Untam-Up-te-j≥, aƒ´n-
π-Ivknw-Kv, Unaƒ´n-πn-Ivknw-Kv)
(b) tamUp-te-j≥ F∂Xv Hcp Xc-Øn¬
{^oI-z≥kn {Sm≥kvtej\mWv. Bwπn-
‰-yqUv tamUp-te-j-\p-ambn _‘-s∏-
SpØn CsX-ß-s\-sb∂v hni-Z-am-°p-I
(3)
(c) amØ-am-‰n-°¬ FIvkv{]-js‚ klm-
b-tØmsS Hcp AM thhns‚
{^oIz≥kn kvs]Iv{Sw hc-bv°pI (2)
10. (a) hfsc Zqc-tØbv°v Sn.hn kn·-ep-Isf
Ab-°p-∂-Xv.........-s{]m-∏-tK-j-\n-eq-sS-
bmWv. (1)
({Ku≠v thhv, kvssIth-hv, kvt]kv
thhv, Ch-sbm-∂p-a-√. (1)
(b) tdUntbm thhv s{]m∏-tK-j-\n¬
A¥co-£-Ønse Ab-sWm-kvs -̂-dnIv
seb-dns‚ {]m[m-\yw hni-Z-am-°pI
(2)
16
a desired range of frequencies.
(filter, comparator, integrator,differentiator) (1)
(b) Draw the circuit diagram of asimple RC integrating circuit. (2)
(c) Draw the output waveforms ofintegrating circuit for a square waveinput. (1)
(d) Explain the effect of change in RCtime constant value of the abovecircuit. (2)
11. (a) Hcp {]tX-yI td©n-ep≈ {^oI-z≥kn-
Isf th¿Xn-cn-s®-Sp-°m≥..........-k¿I-yq v́
D]-tbm-Kn-°p-∂p.
(^n¬´¿, Iº-td-‰¿, C‚t{K‰¿,
Un{^≥jn-tb-‰¿ k¿Iyq-́ ns‚ Ub{Kw
hc-bv°p-I. (1)
(b) Hcp RC C‚t{K‰nwKv k¿I-yq-´ns‚
Ub{Kw hc-°p-I. (2)
(c) Hcp C‚t{K‰nwKv k¿I-yq-´n¬ C≥]p-
´mbn Hcp kvIz-b¿ thhv sImSp-Øm¬
e`n-°p∂ Hu´v]p´v thhvt^mw hc-
bv°pI (1)
(d) ta¬∏-d™ k¿I-yq-´n¬ RC ssSw
tIm¨Ã‚ v amdp-tºmƒ Hu v́]p v́ thhn-
\p-≠m-Ip∂ am‰-߃ hni-Zo-I-cn-°p-I.
(2)
17
1 a) Zener diode 1b)
3 4
2 a) X OR or X NOR (Both are correct) 1b)
2 6
2. c) Draw the circuit of a one bit comparator. 3
If A>B, o/p of G1 is HighIf A < B, o/p of G3 is HighFor A = B, o/p of G2 is High OR
2. a) Multiplexer 1b)
2
The data select lines A and B decide which data input line is routed to the o/p
Qn. Sub Value points Score TotalNo. Qns.
Answer Key
aci/p
Transformer
Rectifier Filter Regulator constantdc o/p
↔
y (o/p)
D4 : 1Mux
D1
D2
D3
Data i/p
A B (Data select)
→
XORA B Y
0 0 0
0 1 1
1 0 1
1 1 0
XNORA B Y
0 0 1
0 1 0
1 0 0
1 1 1
18
2. c. The circuit diagram of a 4 : 1 multiplexer. 3 6
3 a) laser diode 1
b) • Long distance transmission• Large information capacity• Small size, low weight• Enhanced safety ½x4• Signal security (Any four) 2
c) A photodiode is operated in the reverse biased condition. 8As light falls in it, reverse saturation current increases.This increase in current is proportional to the amountof light. The structure of pin diode contains an i layerthereby widening the depletion layer. This increases the area 3available for capturing light. The time constant is alsoreduced. Thus pin diode becomes a better detector for highfrequencies also
d) Draw the structure of an optical fiber 2
4 a) interlaced scanning 1b) AM - VSB 1c) 7MHz 1d) Flickering can be avoided by increasing the frame rate. But
this increases the total bandwidth needed for transmittingTV signal. By conserving (saving) bandwith and at the sametime to avoid flicker, interlaced scanning can be used. In 3 6interlaced scanning the same frame is scanned twice bydividing the frame into odd andeven fields.
5 a) Printer 1b) The laser printer components should be drawn. Photosensitive
drum - given negative charge - laser beam falls on selectedareas of drum according to print image file - those areas get 3 5+ve charge - Negatively charged toner particles adhere to+vely charged portions of the drum - Fusers and rollers areused to produce permanent image on the paper
c) Cache memory 1
6 a) • File sharing• Security• Resource sharing
Qn. Sub Value points Score TotalNo. Qns
19
Qn. Sub Value points Score TotalNo. Qns
• Communication ½x4 = 2• Flexible Access (Any 4)
b) Network Interface card (NIC) 1 6c) HTML 1d) MODEM Explanation 2
7. a) local loop 1b) TDMA requires more time to transmit signals from several
sources. FDMA requires less time as different frequencies areused by different signals. Thus in FDMA bandwidth is divided 3whereas in TDMA, time is divided. This means that FDMAneeds more bandwidth than TDMA.
c) Code division multiple Access provides better data security 6when compared with FDMA & TDMA technologies. CDMAuses the entire frequency range available. The base stationallocates different codes to different users. At the receiving 2end the correct chip code has to be known in order to decodethe data.
8. a) 2 fmb) Sampling process converts an analog signal into digital signal 1
Instead of transmitting this analog signal, sample values aretaken at regular intervals and transmitted. However at the 2 4receiving side, the quality of the signal reconstructed dependson the frequency of samples.
c) quantization 1
9. a) modulation 1b) In amplitude modulation, the modulating signal represented
by Vm sinωm t is transmitted over the carrier Vc sinwmt.ie., amplitude of carrier Vc is made preportinal to Vm sinωmt
Thus the AM wave becomes Vcsinωct +MVc
2 [cos (ωc - ωm)t 6
- cos (ωc + ωm)t] 3ie., fm (or ωm) is translated to fc + fm (or ωc +ωm) andfc - fn (ωc - ωm)Thus AM is a kind of frequency translation.
c) Draw the spectrum of an AM signal 2
20
Qn. Sub Value points Score TotalNo. Qns
10. a) Space waveb) In ionosphere the radio waves are refracted by ionospheric 1
layers D1, E1 F1 and F2. Among there F1 + F2 tend to sent backthe radio wave after refraction from the ionosphere. Here the 2 3extend to which the radio wave is refracted depends on theionization density of ionosphere. Atmospheric distributiondoes not affect the propagation of radio waves as ionizationdensity, angle of incidence and frequency of radio waves arethe only factors that affect propagation of radio waves.
11. a) Filter 1
b) Draw RC integrator circuit 2
c) A triangular wave. 1d) For an integrator, to perform better integration, the RC time 2 6
constant should be very large compared to the time period ofthe input signal. Other wise, the output for a square wavewill not be a triangular wave, but it will be wave form similiarto the charging and discharging wave forms of a capacitor.
21
Qn. Content/ LO. Specific Form of Score TimeNo. Unit No. thinking Questions Minutes
skills (no.)
1(a) 1 1.1 1.1 Objective 1 21(b) 1 1.2 1.2 Essay 3 102(a) 3 3.3 1.1 Objective 1 22(b) 3 3.5 1.2 Short Answer 2 32(c) 3 3.6,3.7 5.1 Short Answer 3 43(a) 7 7.1 1.2 Objective 1 23(b) 7 7.3 2.6 Short Answer 2 33(c) 7 7.7,7.9 5.2 Short Answer 3 23(d) 7 7.9 2.4 Short Answer 2 24(a) 8 8.2 2.1 Objective 1 24(b) 8 8.2 1.2 Objective 1 24(c) 8 8.3 1.2 Objective 1 24(d) 8 8.3 4.2 Essay 3 105(a) 9 9.2 1.2 Objective 1 25(b) 9 9.2 4.2 Short Answer 3 45(c) 9 9.3 1.1 Objective 1 26(a) 10 10.1 2.6 Short Answer 2 36(b) 10 10.3 1.2 Objective 1 26(c) 10 10.4 1.2 Objective 1 26(d) 10 10.4 1.1 Short Answer 2 37(a) 11 11.2 1.1 Objective 1 27(b) 11 11.8 4.1 Essay 3 107(c) 11 11.8 4.2 Short Answer 2 68(a) 6 6.2 1.1 Objective 1 28(b) 6 6.2 2.6 Short Answer 2 38(c) 6 6.4 2.6 Objective 1 29(a) 4 4.1 1.2 Objective 1 29(b) 4 4.2 6.3 Essay 3 69(c) 4 4.3 5.2 Short Answer 2 6
10(a) 5 5.2 1.1 Objective 1 210(b) 5 5.6, 5.5 4.2 Short Answer 2 411(a) 2 2.4 1.1 Objective 1 211(b) 2 2.4 2.1 Short Answer 2 311(c) 2 2.3 2.1 Short Answer 1 211 (d) 2 2.3 6.3 Short Answer 2 4
QUESTION BASED ANALYSIS - ELECTRONICS
1
Sample Question Paper - II
2
Sl.No. Content/ Unit LO. No. Score
1 Poner supply unit & voltage stabilizers 1.3, 1.4 42 Waveshaping circuits 2.6, 2.6, 2.7 63 Digital Electronics 3.5, 3.1, 3.8 64 Radio Brodcasting 4.5, 4.9, 4.10 65 Communication systems 5.5, 5.7 36 Data Communication 6.1, 6.2 47 Optical fiber and satellite communication 7.3, 7.7, 7.8, 7.9 88 Television 8.6, 8.2, 8.3, 8.4 69 Fundamentals of capulers 9.2, 9.4, 9.5 5
10 Internet technology 10.6, 10.7 611 Basics of telephoen communication 11.1, 11.4 6
Total 60
WEIGHT TO CONTENT & LEARNING OUTCOMES
No. Type No. of Questions Score Percentage
1 Objective 11 15 252 Short Answer 16 36 603 Essay 3 9 15
Total 60 100
WEIGHT TO FORM OF QUESTIONS
No. Thniking Skills Score Percentage
1 For conceptual attainment 36 602 For conceptual generation 24 40
Total 60 100
WEIGHT TO THINKING SKILLS
3
Thinking skills for Thinking skills forConceptual attainment Conceptual Generation
Unit Objective Short Answer Essay Objective Short Answer Essay Total1 1(1) 3 (1) 4(2)2 1(1) 6(4)
1(1) 2(2)3 1(1) 2(1) 3(1) 6(3)4 2(3) 6(3)5 3(1) 3(1)6 2(2) 4(2)7 1(2) 3(1) 3(1) 8(4)8 1(2) 2(1) 2(1) 6(4)9 5(1) 5(1)
10 1(1) 3(1) 2(1) 6(3)11 1(1) 3(1) 2(1) 6(3)
Total 9(9) 24(10) 3(1) 6(2) 12(6) 6(2) 60(30)
BLUE PRINT
4
1. (a) Voltage regulators provide aconstant voltage across the load......is an example for adjustablepositive voltage regulator.
(LM 317, LM337, 7805, 7905) (1)
(b) Give the pin out diagram of theabove IC and explain how can it beused as a positive voltageregulator. (3)
1. (a) thmƒt´Pv sdKp-te-‰¿ sF.kn-Iƒ
temUn\v ]mc-e-embn ÿnc thmƒt´Pv
\¬Ip-∂p. AUvP-Ãn-_nƒ thmƒt´Pv
sdKpte-‰dn\v DZm-l-c-W-amb Hcp
sF.kn ..................... BWv.
(LM 317, LM337, 7805, 7905) (1)(b) ta¬∏-d-™n-cn -°p∂ sF.kn-bpsS
]n≥U-b{Kw hc®v AXv Fß-s\-bmWv
t]mkn-‰ohv thmƒt´Pv sdKp-te-‰-dmbn
D]-tbm-Kn-°p-∂Xv F∂v hnh-cn-°p-I.
(3)
General Instructions to candidates:• There is a 'Cool off time' of 15 minutes in addition to the writing time of 2 h.• You are neither allowed to write your answers nor to discuss anything with others during the 'cool off time'.• Use the 'cool off time' to get familiar with questions and to plan your answers.• Read the questions carefully before answering• All questions are compulsory and only internal choice is allowed.• When you select a question, all the sub-questions must be answered from the same question itself.• Calculations, figures and graphs should be shown in the answer sheet itself.• Malayalam version of the questions is also provided.• Give equations wherever necessary• Electronics devices except nonprogrammable calculators are not allowed in the Examination Hall.s]mXp-\n¿t±-i-߃
• \n¿±njvS ka-b-Øn\v ]pdsa 15 an\n v́ "Iqƒ Hm v̂ ssSw' D≠m-bn-cn-°pw. Cu ka-bØv tNmZy-߃°vDØcw Fgp-Xmt\m, a‰p-≈-hcp-ambn Bibw hn\n-abw \S-Ømt\m ]mSn-√.
• DØ-c-߃ Fgp-Xp-∂-Xn\v apºv tNmZy-߃ {i≤m-]q¿Δw hmbn-°-Ww.
• F√m tNmZy-߃°pw DØcw Fgp-X-Ww.
• Hcp tNmZy-\-º¿ DØ-c-sa-gp-Xm≥ sXsc-s™-SpØv Ign-™m¬ D]-tNm-Zy-ßfpw AtX tNmZy-\-º-cn¬ \n∂v Xs∂ sXsc-s™-Sp-t°-≠-Xm-Wv.
• IW°v Iq -́ep-Iƒ, Nn{X-߃, {Km^p-Iƒ, F∂nh DØ-c-t]-∏-dn¬Øs∂ D≠m-bn-cn-°-Ww.
• tNmZy-߃ ae-bm-f-Ønepw \¬In-bn-́ p-≠v.
• Bh-iy-ap≈ ÿeØv ka-hm-Iy-߃ sImSp-°Ww
• t{]m{Km-ap-Iƒ sNøm-\m-ImØ Im¬°p-te-‰-dp-Iƒ Hgp-sI-bp≈ Hcp Ce-Ivt{Sm-WnIv D]-I-c-Whpw
]co-£m-lm-fn¬ D]-tbm-Kn-°m≥ ]mSn-√.
F.Y.March 2016
Reg. No: ..........................................
Name : ..........................................Part - III
ELECTRONICSMaximum : 60 Scores
Time: 2 hCool off time : 15 Minutes
SET- 2
5
2. (a) The voltage follower circuit usingop-amps provides a voltagegain of.........(360, 180, 0, 1) (1)
(b) A voltage follower using op-ampsworks as a good impedancematching circuit. Explain how thisis possible. (2)
(c) Draw the circuit diagram of voltagefollower using op -amps. (1)
(d) Suggest on application where op-amp voltage follower can be usedfor impedance matching (2)
OR
2. a) Integrating circuits using op ampsare preferred to simple RCintegrating circuits. Comment onthis statement (1)
(b) Draw the circuit diagram of an op-amp integrating circuit. (2)
(c) A comparator, using op-amp circuitcan be called as an analog to digitalconverter. Substantiate. (3)
3. (a) Digital circuits are commonly usedin the memory of a computersystem. ..........is a circuit which canbe used as a 1-bit memory (counter,flip flop, comparator, adder) (1)
(b) Draw the circuit diagram of theabove circuit cosidering a four bitdata storage (3)
(c) Is flip flop an example forsequential circuit? Substantiateyour answer. (2)
2. (a) Hm]v Bºp-Iƒ D]-tbm-Kn -®p≈
thmƒt´Pv t^mtfmh¿ k¿I-yq´v .....
thmƒt´Pv sKbn≥ Xcp-∂p. (360, 180,
0,1) (1)
(b) Hm]v Bºp-Iƒ D]-tbm-Kn -®p≈
thmƒt´Pv t^mtfm-h¿ k¿I-yq-´p-Iƒ
Hcp \√ Cw]n-U≥kv am®nwKv k¿I-yq-
´mbn {]h¿Øn-°p-∂p. CXv Fßs\
km[-y-am-Ip∂p F∂v hnh-cn-°p-I. (2)
(c) ta¬∏-d™ Hm]v Bºv D]-tbm-Kn-®p≈
thmƒt´Pv t^mtfm-h¿ k¿I-yq-´ns‚
k¿I-yq v́ Ub{Kw hc-bv°pI (1)
(d) Cw]n-U≥kv am®nw-Kn-\mbn Hm]v Bºv
D]-tbm-Kn-®p≈ thmƒt´Pv t^mtfm-h¿
k¿I-yq-́ ns‚ Hcp D]-tbmKw Fgp-XpI
(2)
OR2. (a) Hcp knw]nƒ B¿.-kn. C‚ vt{K‰nwKv
k¿I-yq-́ ns\ At]-£n®v Hm]v Bºv D]-
tbm-Kn-®pff C‚ vt{K‰nwKv k¿I-yq-́ n-s\-
bmWv \mw IqSp-X-embn D]-tbmKn°m≥
Xm¬]-c-y-s∏-Sp-∂-Xv. CXn-s\-°p-dn®v
\nß-fpsS A`n-{]mbw tcJ-s∏-Sp-Øp-I.
(1)
(b) ta¬∏-d™ Hm]v Bºv C‚ vt{K‰nwKv
k¿I-yq-́ ns‚ Ub{Kw hc-bv°p-I. (2)
(c) Hm]v Bºv D]-tbm-Kn-®p≈ Hcp Iw]m-
c-‰¿ k¿I-yq-́ ns\ A\-temKv ‰p UnPn-
‰¬ I¨th¿ -́dm-sW-Wv ]d-bmw. \nß-
fpsS DØcw km[q-I-cn-°p-I. (3)
3. (a) Iwº-yq-´-dns‚ saΩdn k¿I-yq-´p-I-fn¬
km[m-c-W-bmbn UnPn-‰¬ k¿I-yq-´p-
Iƒ D]-tbm-Kn-°p-∂-Xmbn ImW-s∏-Sm-
dp≠v. 1˛_n‰v saΩdn sk√mbn D]-tbm-
Kn-°p-∂-Xv....-k¿I-yq v́ BWv (Iu≠¿,
v̂fn]v̂ vtem-]v, Iw]m-c-‰¿, BU¿)(1)
(b) ta¬∏-d™ k¿I-yq-´p-]-tbm-Kn®v Hcp
4˛_n‰v tU‰ tÃm¿ sNøp-∂-Xn\v Bh-
i-y-amb k¿I-yq v́ hc-bv°p-I. (3)(c) ^vfn]v^vtfm]v Hcp knI-z≥j-y¬
k¿Iyq-́ ns‚ DZm-l-c-W-am-tWm? \nß-
fpsS DØcw km[q-I-cn-°p-I. (2)
6
4. (a) A superheterodyne radio receiveris preferred over a TRF receiver.What are the possible reasons forthis? (2)
(b) In a super heterodyne receiver, thein coming RF signals are mixedwith a local oscillator output. Iflocal oscillator output is a 1MHzsignal and the incoming RF signalsare of 1.5 MHz, what are thefrequencies that will be producedat the mixer output? (2)
(c) Explain the heterodyning processin a superheterodyne radioreceiver. (2)
5. The sky wave is radiated in upwarddirection and returned to earth at somedistant location because of refractionand reflection from the ionosphere.
(a) Give the significance of criticalfrequencyin sky wave propagation.
(1)
(b) Explain the terms critical frequencyand maximum usable frequency insky wave propagation (2)
6. Quantization is unavoidable in PCM
(a) Write the need of quantiztion (2)
(b) What is the problem withquantization (2)
7. (a) Light travels down an optical fibrecable. Light propagates in opticalfibre cable according to............(refraction, reflection, totalinternal reflection). (1)
(b) Name two light sources used foroptical fiber communication? (1)
4. (a) Sn.B¿.-F^v dnko-h-dn-s\-°mƒ kq∏¿
sl‰-tdm-U-bn≥ dnko-h-dmWv \mw km[m-
c-W-bmbn D]-tbm-Kn-°p-∂Xv. Fs¥-√m-
amWv CXns‚ Imc-W-߃. (2)
(b) Hcp kq∏¿ sl‰-tdm-U-bn≥ tdUntbm
dnkn-h-dn¬ B¿. F^v kn·-\-ep-Isf
tem°¬ Hmkn-te-‰¿ kn·-ep-I-fp-ambn
anIvkv sNøp-∂p. tem°¬ Hmkn-te-‰¿
kn·-ep-Iƒ 1MHz epw RF kn·¬ 1.5MHz ep≈Xp-am-sW-¶n¬ anIvk¿ k¿Iyq-
´ns‚ Hu v́]p´n¬ Fs¥√mw {^nI-z≥kn-
Iƒ D≠mIpw? (2)
(c) ta¬∏-d™ kq∏¿s^‰-tdm -U-bn≥
tdUntbm dnko-h-dns‚ "sl‰-tdm-U-b-
\nwKv' F∂ {]{In-bsb Ipdn®v hnh-cn-
°p-I. (2)
5. apI-fn -te°v tdUn -tb‰v sNø-s∏-Sp∂
kvssIth-hp-Iƒ Xncn®v `qan-bn-te°v Xs∂
Atbm-tWm-kv^n-b-dnse dn{^m-£≥, dn^vf-
£≥ F∂o {]h¿Ø-\-߃°p-tijw Xncn-
s®-Øp-∂p.
(a) kvssIthhv s{]m∏-tK-j-\n¬ {In´n-°¬
{^oI-z≥kn-bpsS {]m[m-\-y-sØ-°p-dn®v
hnh-cn-°p-I. (1)
(b) kvssIthhv s{]m∏-tK-j-\n¬ {In´n-°¬
{^oI-z≥kn, amIvknaw bqk-_nƒ
{^oIz≥kn F∂n-h-sb-Ip-dn®v hnh-cn-
°pI. (2)
6. ]n.kn.-Fw. knÃ-Øn¬ "Izm-ss≠-tk-j≥'
F∂Xv Hgn-hm-°m-\m-hm-Ø-XmWv
(a) "Izmss≠tkj≥' F∂-Xns‚ Bh-i-y-
IX hy‡am°p-I. (2)
(b) ta¬∏-d™ {]{In-b-bn¬ t\cn-Sp∂
_p≤n-ap-́ p-Iƒ Fs¥√mw? (2)
7. (a) Hcp Hm]v‰n-°¬ ss^_¿ tI_n-fn¬
sse‰v IS-∂p-t]m-Ip-∂Xv.........{]{Inb hgn-
bmWv (dn{^m-£≥, dn^vf -£≥,
A_vtkm¿]vj≥, tSm´¬ C‚t‚W¬
dn^vf-£≥) (1)
(b) H]v‰n°¬ ss^_¿ IΩ-yq-Wn-t°-j-\p-
th≠n D]-tbm-Kn-°p∂ c≠v sse‰v
tkmgvkp-Iƒ°v DZm-l-c-W-sa-gp-XpI(1)
7
(c) Draw the basic block diagram of anoptical fiber communicationsystem. (3)
(d) 1. What are the features of a singlemode fiber?
2. Compare step index and gradedindex fibers? (3)
8. (a) Colour TV is based on the mixingof primary colours. .......... colourmixing is the basic principle ofcolour TV. (1)
(b) In television scanning, thecombination of two fields iscalled....(frame, vertical trace,horizontal trace, retrace) (1)
(c) TV signals are transmitted alongwith some synchronizing pulses.Explain. (2)
(d) With the help of a diagram, explainthe channel bandwidthrequirements of TV. (2)
9. Classify the following as input, outputand memory devices:-
Laser printer, monitor, scanner,microphone, loudspeaker, RAM,Joystick, CDROM, hard disk, flash drive
(5)
10. (a) The unique identifier of a computeris called.......
(b) Write a URL and identify thedomain name included in it (2)
(c) Expand the following: FTP, HTML,HTTP. (3)
(c) Hcp Hm]v‰n-°¬ ss^_¿ IΩ-yq-Wnt-t°-
j≥ knÃ-Øns‚ tªm°v Ub{Kw hc-
bv°p-I. (3)
(d) i. Hcp knwKnƒ tamUv ss^_-dns‚
{]tXy-I-X-Iƒ Fs¥√mw?
ii. tÃ∏v C≥UIvkv ss^_-dns‚bpw
t{KUUv C≥UIvkv ss^_-dns‚bpw
{]tX-y-I-X-Iƒ XΩn¬ Xmc-X-ayw
sNøpI (3)
8. (a) ss{]adn If-dp-I-fpsS anIvknw-Kns\ ASn-
ÿm-\-s∏-Sp -Øn -bmWv If¿ Sn.hn.
{]h¿Øn-°p-∂-Xv......-X-c-Øn-ep≈ If¿
anIvknw-KmWv If¿ Sn.hn-I-fpsS ASn-
ÿm\ XX-zw. (1)
(b) sSen-hn-j≥ kvIm\nwKv {]{In-b-bn¬,
c≠v ^n¬Up-Iƒ XΩn¬ tNcp-tºmƒ
.....F∂p ]d-bp-∂p. (s{^bnw, th¿´n-°¬
s{Sbn-kv, s^mdn-tkm-≠¬ s{Sbn-kv, dos{S-
bn-kv) (1)
(c) Sn.hn kn·-ep-Iƒ Zqsc ÿe-tØ°v
{Sm≥kvan‰v sNøp-tºmƒ knw{K-ssW-
knwKv ]mƒkp-Isf tN¿°p-∂p. ImcWw
hy-‡-am-°p-I. (2)
(d) Hcp Ub-{K-Øns‚ klm-b-tØm-Sp-IqSn
Sn.hn-bpsS _m≥Uv hnSvØv Bh-i-y-ß-
sf-°p-dn®v hnh-cn-°p-I. (2)
9. Xmsg X∂n-cn-°p-∂-hsb C≥]p-́ v, Hu v́]p-́ v.
saΩdn Unssh-kkv F∂n-ßs\ Xcw Xncn-
°p-I.
tek¿ {]n‚¿, tamWn-‰¿, kvIm\¿, ssat{Im-
t^m¨, euUvkv]o-°¿ dmw, tPmbvÃn-°v,
kn.Un tdmw lm¿Uv UnkvIv, ̂ vfmjv ss{Uhv.
(5)
10. (a) Hcp Iº-yq-́ -dns‚ bqWnIv sFU‚n^b-
dns\.....F∂p ]d-bp-∂p. (1)
(b) Hcp bq.B¿.-F¬. \p≈ DZm-l-c-W-sa-
gpXn AXns‚ sUmsa-bn≥ s\bnw Xncn-
®-dn-bp-I. (2)
(c) Xmsg-∏-d-bp-∂-h-bpsS ]q¿Æ cq]w Fgp-
Xp-I. FTP, HTML, HTTP. (3)
8
11. (a) Sketch the block diagram of apublic switched TelephoneNetwork. (3)
(b) Stored program control conceptallows us to make or add newfacilities to the telephone system.What is the reason behind it. (2)
(c) Name two different types of SPC's(1)
11. (a) Hcp ]ªnIv kzn®v sSen-t^m¨ s\‰v
h¿°ns‚ tªm°v Ub{Kw hcbv°pI.
(3)
(b) \ne-hn-ep≈ sSen-t^m¨ kwhn-[m-\-
Øn-te-°v ]pXnb Hcp Aπn-t°-j≥
tN¿°p-∂-Xn-\p-th≠n \mw FIvkvtN-
©nse tÃm¿Uv t{]m{Kmw I¨t{Smƒ
knÃw F∂ Bi-bsØ B{i-bn-
°p∂p. CXn\p ]n∂n-ep≈ ImcWw hy-
‡-am-°p-I. (2)
(c) c≠v hy-X-ykvX Fkv.-]n.-kn-I-fpsS t]cp-
Iƒ \n¿t±-in-°p-I. (1)
9
1 a. LM 317 1 1b Draw the circuit diagram of the IC and explain how
different regulated voltages are obtained with necessary 3 4equation.
2 a. 1b. The circuit has high input impedence and low
output impedenceO/P voltage is exact copy of i/p 2
c. The circuit of a voltage follower. 1 6d. In a public address system, impedance matching is needed
between loudspeaker and PA to deliver maximum power. 2Here, an op-amp follower can be used.
OR a. An op-amp integrator can mark effeciently for a higherrange of frequencier, ie, they work properly for highfrequencies also. 1
b. Op - amp integrating circuit 2c. For a comparator circuit
if Vin < Vref, VO = -V sat& if Vin > Vref, VO = +Vsat 3 6Thus the comparator it can mark as an analog to digitalconverter
3. a. Flip flop 1b. The circuit diagram of a 4 bit shift register 3 6c. Any 2 aspects of sequential circuit (has memory storage,
o/p previous o/p, i/p and present i/p) 24. a. Better selectivity
High sensitivityBetter adjacent channel rejection (Image freq) (any two) 2 6
b Sum and difference frequences 2c. Heterodyning process is to be explained by taking an
example. 25. a. Critical frequency for a given layer is the highest frequency
that can return to Earth after reflection critical frequency 1½depends on the ioniztion density.
b. Fc represents the highest freq; that can be reflected back at 1½ 3vertical incidence. The maximum frequecy that can bereflected back for a given distance of transmission is calledmaximum usable frequency (MUF)
Qn. Sub Value points Score TotalNo. Qns
Answer Key
10
MUF = criticalfrequency
cos6 a. In pulse code modulation, sampling process samples the
analog signal into a number of samples. There sampledvalues are approximated to a nearest voltage ...byquantization. If there are N quantzed voltage level, nnumber of bits are need to incode them into binary such 2 4than N=2n. Thus quantization is unavoidable is PCM.Otherwise two many voltage levels should have beenencoded.
b. Quantization error 2
7. a. Total internal reflection 1b. LEB, larer diodes 1 8c. Block diagram 3d. (i) Single mode - small core
- light trands in straight line 1- unlimited BW- large capacity(ii) Multimode fibers are of 2 types - step index + gradedindex form.Step index mode - change is refractive index is brupt- low BWGraded index mode - change is refraction index is gradual. 2- less loss- high bandwidth- reduces modal dispersion
8. a. additiveb. frame 1c. Scanning rates at the transmitter and receiver sides must be
same. Moreover the sound and picture signals must be 2maching. So synchromizing pulsess are added along withTV signals.
d. Picture signals - O to 5 MHzfitter Characterisation - 5.5 MHz -Guard Band - 0.25Vestigial part - 0.75 -filter -.5Total BW = 7 MHzSpectrum showing bandwidth can also be drawn. 2 5
9. Input devices - scanner, microphone, Joystick Output devices- laser printer, monitor, loudspeaker Memory - RAM, 5 5CDROM hard disk, flash drive.
Qn. Sub Value points Score TotalNo. Qns
5.75 MHz
1.25 MHz
11
Qn. Sub Value points Score TotalNo. Qns
10. a. IP address 1b. Domain names is URL represents a web page.
Any example can be written 2c. FTP - file transfer protocol
HTML - Hyper Text Mark up LanguageHTTP - Hyper text Transfer protocol 3 6
11. a. Regional officeSectional officePrimary officeToll office 3End officelocal loops
b. Stored program control concept helps us to make or add new facilities to an exchange system. This is because the junctionsperformed by the exchanges are written in the form of 2programs and stored in the memory. So the SPC allows newchanges by a small change in the programe.
c. Centralised SPC 1 6Distributed SPC
12
Qn. Content/ LO. Specific Form of Score TimeNo. Unit No. thinking Questions
skills (no.)
1(a) 1 1.3 2.5 Objective 1 21(b) 1 1.4 2.4 Essay 3 62(a) 2 2.6 2.5 Objective 1 22(b) 2 2.6 4.1 Short Answer 2 62(c) 2 2.7 2.6 Objective 1 22(d) 2 2.7 6.3 Short Answer 2 43(a) 3 3.5 2.3 Objective 1 23(b) 3 3.5 4.2 Essay 3 103(c) 3 3.1 4.1 Short Answer 2 34(a)) 4 4.5 3.1 Short Answer 2 44(b) 4 4.9 3.1 Short Answer 2 64(c) 4 4.10 3.2 Short Answer 2 6
5 5 5.7,5.5 3.2 Short Answer 3 46(a) 6 6.1 2.7 Short Answer 2 36(b) 6 6.2 2.7 Short Answer 2 37(a) 7 7.3 1.2 Objective 1 27(b) 7 7.3 1.2 Objective 1 27(c) 7 7.7 2.2 Short Answer 3 67(d) 7 7.8, 7.9 5.2 Essay 3 78(a) 8 8.6 1.2 Objective 1 28(b) 8 8.2 1.2 Objective 1 28(c) 8 8.3 4.3 Short Answer 2 48(d) 8 8.4 2.7 Short Answer 2 6
9 9 9.2,9.4,9.5 2.3 Objective 5 710(a) 10 10.6 1.2 Objective 1 210(b) 10 10.6 6.1 Short Answer 2 3
10(c) 10 10.7 3.1 Short Answer 3 411(a) 11 11.1 1.2 Short Answer 3 411(b) 11 11.4 6.1 Short Answer 2 411(c) 11 11.4 1.1 Objective 1 2Total 60 120
QUESTION BASED ANALYSIS - ELECTRONICS
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