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tut2_problems_31_01_09

Course: EE EE308, Spring 2009
School: IIT Bombay
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Word Count: 367

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of Department Electrical Engineering EE 308: Communication Systems (Spring 2009) Course Instructor: Prof. Abhay Karandikar Problem Set 2 1. An AM signal xc (t) = Ac cos(2fc t)m(t) is passed through a filter of impulse response h(t), resulting in an output v(t). Find the conditions on h(t) so that m(t) can be recovered from v(t) by synchronous detection. h(t) is called the "Sideband Shaping...

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of Department Electrical Engineering EE 308: Communication Systems (Spring 2009) Course Instructor: Prof. Abhay Karandikar Problem Set 2 1. An AM signal xc (t) = Ac cos(2fc t)m(t) is passed through a filter of impulse response h(t), resulting in an output v(t). Find the conditions on h(t) so that m(t) can be recovered from v(t) by synchronous detection. h(t) is called the "Sideband Shaping Filter". For example, h(t) may be designed so as to pass one sideband of the AM signal completely, wheras retain only a trace or vestige of the other sideband. The resulting output v(t) is then called the Vestigial Sideband modulated signal. 2. Let xc (t) = cos c t + 0.2 cos m t sin c t. (a) Show that xc (t) is a combination AM-FM signal. (b) Sketch the phasor diagram at t = 0. 3. The envelope detector illustrated in Fig. 3 is to be used to demodulate the AM signal xc (t) = Ac (1 + cos 2fm t) cos 2fc t, fc >> fm . (a) Sketch the waveshape of the current through the diode. (b) Determine the largest permissible value of the time-constant, RC. Figure 1: 4. Sketch the of spectrum the FM signal xc (t) = Ac cos(2fc t + 1 sin 2fm1 t + 2 sin 2fm2 t) and hence establish the non-linearity of frequency modulation. 1 5. Consider an AM signal xc (t). The signal at the receiver end, r(t) is given by r(t) = xc (t) + xc (t - ), || < 1. Investigate and compare the performance of (a) envelope detector and (b) synchronous detector. Consider two special cases, c = and c = /2. 6. x(t) be a sawtooth waveform, i.e. x(t) = At/T0 for 0 t < T0 x(t T0 ) = x(t) t Sketch the FM and PM signals of x(t). 7. A carrier wave of frequency 100 MHz is frequency modulated by a sine wave of amplitude 20 V and frequency 100 kHz. The frequency sensitivity of the modulator is 25 kHz/V. (a) Determine approximate bandwidth of the FM wave, using Carson's Rule (b) Determine the Bandwidth by transmitting only those side frequencies with amplitudes that exceed 1% of unmodulated carrier amplitude. (c) Repeat the calculations, assuming the amplitude of modulating wave is doubled. (d) Repeat the calculations, assuming the modulation frequency is doubled. 2
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IIT Bombay - EE - EE308
Department of Electrical Engineering EE 308: Communication Systems (Spring 2009) Course Instructor: Prof. Abhay KarandikarSolutions to Problem Set 2 1. Since Xc (f ) = we have Ac [M(f - fc ) + M(f + fc )] H(f ), 2 The output of the product modulator is V
IIT Bombay - EE - EE308
Department of Electrical Engineering EE 308: Communication Systems (Spring 2009) Course Instructor: Prof. Abhay KarandikarProblem Set 3 1. Let xc (t) = Ac cos [2fc t + (t)] and xi (t) = Ai cos [2fc t + i (t)] be any two bandpass Ai signals with = Ac . (a
IIT Bombay - EE - EE308
Department of Electrical Engineering EE 308: Communication Systems (Spring 2009) Course Instructor: Prof. Abhay KarandikarSolutions to Problem Set 1 1. Let xc (t) = Ac cos [2fc t + (t)] and xi (t) = Ai cos [2fc t + i (t)] be any two bandpass Ai signals w
IIT Bombay - EE - EE308
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IIT Bombay - EE - EE308
Department of Electrical Engineering EE 308: Communication Systems (Spring 2009) Course Instructor: Prof. Abhay KarandikarSolutions to Problem Set 4 1. Solution: The spectrum of the PAM signal is given byS(f ) = fs H(f )k=-M(f - kfs )(1)where f 800
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Chapter 14Mechanisms of Genetic Variation1Mutations: Their Chemical Basis and Effectsstable, heritable changes in sequence of bases in DNA point mutations most common from alteration of single pairs of nucleotide from the addition or deletion of nucle
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Chapter 15Recombinant DNA Technology1Some Terminologygenetic engineeringrecombinant DNA technologydeliberate modification of organism's genetic information by directly changing the sequence of nucleic acids in its genome procedures used to carry out
University of Texas - BIO - 326R
HW answer key: Ch 9/10 MCQ: 1) C 2) C 3) C 4) B 5) B 6) B 7) CTrue/ False: 1) F 2) T 3) F 4) T 5) T 6) F 7) F
University of Texas - BIO - 326R
HW: Ch 9 &amp; 10 MCQ: 1) A complete enzyme that consists of a protein component and a nonprotein component is called a(n) A. apoenzyme. B. heteroenzyme. C. holoenzyme. D. multienzyme. 2) Enzymes catalyze a reaction by A. decreasing the amount of energy relea
University of Texas - BIO - 326R
Answer key: HW Ch 12 MCQ: 1) D 2) C 3) C 4) A 5) D 6) B 7) C 8) B 9) A 10) D True / False: 1) F 2) F 3) F 4) T 5) T 6) F 7) T 8) F 9) T 10) T
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HW: Ch 12 MCQ: 1) Which of the following is true about the structure of DNA? A. Purine and pyrimidine bases are attached to the 1'-carbon of the deoxyribose sugars. B. Purine and pyrimidine bases are joined by phosphodiester bonds. C. Adjacent bases are s
University of Texas - BIO - 326R
Answer key: HW Ch 13 MCQ: 1) A 2) A 3) C 4) B 5) C 6) D 7) D 8) B 9) B 10) A True / False: 1) F 2) T 3) F 4) T 5) F 6) T 7) TMatch A and B: 1) iv 2) vi 3) v 4) vii5) i 6) iii 7) ii
University of Texas - BIO - 326R
HW: Ch 13 MCQ: 1) If Escherichia coli is cultured in broth containing both glucose and lactose, it A. uses glucose preferentially until the supply is exhausted, then uses lactose. B. uses lactose preferentially until the supply is exhausted, then uses glu
University of Texas - BIO - 326R
Ch 14: HW answer key MCQ: 1) C 2) D 3) B 4) A 5) B 6) A 7) B 8) D 9) A 10) A True or false: 1) F 2) T 3) T 4) F 5) F 6) F 7) T Fill in the blanks: 1) Auxotrophs 2) Nonsense 3) Mutagens 4) Regulatory 5) Alleles
University of Texas - BIO - 326R
HW: Ch 14 MCQ: 1) A mutagen that inserts between the stacked bases of a DNA double helix, distorting the DNA to induce single-pair insertions or deletions is called a(n) _ agent. A. insertional B. interspersing C. intercalating D. distortional2) Spontane
University of Texas - BIO - 326R
Ch 15: HW answer key MCQ: 1) B 2) B 3) D 4) C 5) B 6) B 7) C 8) D 9) B 10) A True/ false: 1) F 2) T 3) T 4) F 5) T Fill in the blanks: 1) Endonuclease 2) Human insulin 3) Taq polymerase 4) Transformation 5) Artificial chromosome
University of Texas - BIO - 326R
Ch 15: HW MCQ: 1) Recombinant DNA technology does not rely on which of the following enzymes? A. restriction endonucleases B. RNA methylase C. DNA ligase D. reverse transcriptase 2) Restriction endonucleases in bacteria may have evolved in order to A. car
University of Texas - BIO - 326R
Chapter 30Microbial Interactions1Symbiosisan association of two or more different species of organismsH. A. deBary, 18792Microbial Interactionsectosymbiont endosymbiontorganism located on surface of another organism (usually larger) organism lo
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Chapter 31Infection and Pathogenicity1HostParasite Relationshipshost larger organism that supports the survival and growth of a smaller organism parasites are organisms that live on or within a host organism and are metabolically dependent on the hos
University of Texas - BIO - 326R
Chapter 32Nonspecific (Innate) Host Resistance1M.pneumoniaeAirway ciliaNormal bronchiole2Host Resistance Overviewmost pathogens (disease causing microbes)must overcome surface barriers and reach underlying tissue overcome resistance by host nons
University of Texas - BIO - 326R
Chapter 33Specific (Adaptive) Immunity1Overview of Specific (Adaptive) Immunity three major functions recognize nonself respond to nonself effector response anamnestic responseeliminates or renders foreign material harmless upon second encounter
University of Texas - BIO - 326R
Chapter 35 Clinical Microbiology and Immunology1Overview of the Clinical Microbiology Laboratory clinical microbiologist clinical specimenmajor function is to isolate and identify microbes from clinical specimens rapidly portion or quantity of human
University of Texas - BIO - 326R
Ch 30: HW answer key MCQ: 1) A 2) A 3) D 4) A 5) B 6) D 7) A 8) D 9) C 10) C 11) D 12) A Fill in the blanks: 1) Ectosymbiosis 2) syntrophism 3) Cooperation 4) Pathogen 5) acidicTrue/ False: 1) F 2) T 3) F 4) F5) T
University of Texas - BIO - 326R
Chapter 30: HW MCQ: 1) Any microorganism that spends a portion of its life associated with another organism of a different species is engaged in A. symbiosis. B. synergy. C. parasitism. D. commensalism. 2) In commensalism A. the host and commensal can be
University of Texas - BIO - 326R
Chapter 31: HW answer key MCQ: 1) D 2) D 3) B 4) B 5) B 6) A 7) D 8) D 9) A 10) C True/ False: 1) T 2) F 3) F 4) T 5) F 6) F 7) T Match A and B: 1) E 2) F 3) A 4) G 5) B 6) D 7) C
University of Texas - BIO - 326R
Chapter 31: HW MCQ: 1) The final outcome of most host-parasite relationships depends on A. the number of organisms present in or on the host. B. the virulence of the organism. C. the host's defenses. D. all of the choices 2) Which of the following is requ
University of Texas - BIO - 326R
Chapter 32: HW answer key MCQ: 1) B 2) D 3) A 4) D 5) D 6) A 7) D 8) D 9) D 10) A True/ False: 1) T 2) F 3) F 4) T 5) F 6) T 7) T 8) F 9) F 10) F Match A and B: 1) e 2) d 3) f 4) g 5) b 6) h 7) i 8) j 9) a 10) c
University of Texas - BIO - 326R
Chapter 32: HW MCQ: 1) Substances that are recognized as foreign and provoke immune responses are called A. antibodies B. antigens C. infective agents D. inducers 2) Which of the following is a physical barrier in the nonspecific defense of a mammalian ho
University of Texas - BIO - 326R
Chapter 33: HW answer key MCQ: 1) A 2) D 3) B 4) A 5) D 6) A 7) B 8) A 9) A 10) D 11) B 12) A 13) A 14) C 15) D True/ False: 1) F 2) T 3) F 4) F 5) T 6) F 7) F
University of Texas - BIO - 326R
Chapter 33: HW MCQ: 1) The immune system normally discriminates between _ antigens. A. self and nonself B. B and T cells C. humoral and cell-mediated D. primary and secondary response 2) T cells attack A. host cells that have been parasitized by microorga
University of Texas - BIO - 326R
Chapter 35: HW answer key MCQ: 1) D 2) D 3) A 4) B 5) A 6) A 7) D 8) C 9) C 10) C True/ False: 1) T 2) F 3) F 4) T 5) F
University of Texas - BIO - 326R
Chapter 35: HW MCQ: 1) The clinical microbiology laboratory can provide preliminary identification of microorganisms based on A. microscopic examination of specimens. B. growth or biochemical characteristics. C. immunologic techniques that detect microbia
University of Texas - BIO - 326R
Chapter 34 Antimicrobial Chemotherapy1Chemotherapeutic Agentschemical agents used to treat disease destroy pathogenic microbes or inhibit their growth within host most are antibioticsmicrobial products or their derivatives that kill susceptible microb
University of Texas - BIO - 326R
Chapter 37Human Diseases Caused by Viruses and Prions1Airborne Diseaseswhen human is source, airborne viruses are propelled from respiratory tract by coughing, sneezing, or vocalizing2Chickenpox (Varicella) and Shingles (Herpes Zoster) DNA virus, m
University of Texas - BIO - 326R
Chapter 38Human Diseases Caused by Bacteria1Airborne Diseasesmost involve the respiratory system some are skin diseases2Diphtheria caused by Corynebacterium diphtheriae airborne transmission by grampositive lysogenized strains produce an exotox
University of Texas - BIO - 326R
Chapter 39Human Diseases Caused by Fungi and Protists1Pathogenic Fungi and Protistsfungi are eukaryotic saprophytes ~50 produce mycoses in humans five groups depending on route of infection superficial, cutaneous, subcutaneous are all direct contac
University of Texas - BIO - 326R
Chapter 34 HW answer key MCQ: 1) D 2) C 3) C 4) A 5) D 6) D 7) B 8) D 9) B 10) D True / False: 1) T 2) F 3) T 4) F 5) F Match A and B: 1) D 2) B 3) F 4) C 5) H 6) E 7) I8) G 9) J 10) A
University of Texas - BIO - 326R
Chapter 34: HW MCQ: 1) Consider an antibacterial drug. In which of the following cases would the action of the drug be considered primarily bacteriostatic? A. The minimal lethal concentration (MLC) is equal to the minimal inhibitory concentration (MIC). B
University of Texas - BIO - 326R
Chapter 37: HW answer key MCQ: 1) D 2) D 3) B 4) B 5) D 6) D 7) D 8) A 9) D 10) A 11) A 12) C 13) A 14) A 15) D 16) C 17) C True/ False: 1) F; herpes simplex 2) T 3) F 4) T 5) F; paramyxovirus 6) T7) T 8) F; young children 9) T 10) TCase studies: 1) Shi
University of Texas - BIO - 326R
Chapter 37: HW MCQ: 1) In influenza virus, antigenic shift A. results from reassortment of genomes when two different strains of flu viruses infect the same cell. B. results from the accumulation of mutations in HA and NA in a single strain of flu virus.
University of Texas - BIO - 326R
Chapter 38: HW answer key MCQ: 1) D 2) A 3) D 4) C 5) D 6) A 7) B 8) D 9) D 10) A 11) C 12) C 13) B 14) D 15) B T/F: 1) F 2) T 3) F 4) T 5) F 6) F 7) T 8) F 9) T 10) T Case studies: 1) Meningitis by N.meningitidis, vaccination and antibiotics 2) Mantoux t
University of Texas - BIO - 326R
Chapter 38: HW MCQ: 1) The exotoxin produced by Corynebacterium diphtheriae A. causes an inflammatory response. B. causes the formation of a pseudomembrane on the respiratory mucosa. C. may destroy cardiac and kidney tissue. D. all of the choices 2) Dipht
University of Texas - BIO - 326R
Chapter 39: HW answer key MCQ: 1) B 2) C 3) C 4) B 5) B 6) C 7) D 8) B 9) B 10) D True / False: 1) True 2) False, cryptococcosis 3) T 4) T 5) False, T.cruzi 6) False, hands 7) T 8) T 9) False, immunocompromised 10) T Case Studies: 1) Malaria, Plasmodium;