Analog Comm. 1 Past Paper - Question Bank 2023-24

**Question Bank 2023-24 GIFT (Autonomous) Bhubaneswar** +---------+---------+---------+---------+---------+---------+---------+ | | Marks | | | | | | +=========+=========+=========+=========+=========+=========+=========+ | I | 1 | What...

**Question Bank 2023-24 GIFT (Autonomous) Bhubaneswar** +---------+---------+---------+---------+---------+---------+---------+ | | Marks | | | | | | +=========+=========+=========+=========+=========+=========+=========+ | I | 1 | What is | 2 | | | | | | | the | | | | | | | | need | | | | | | | | for | | | | | | | | modulat | | | | | | | | ion? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 2 | Draw | 2 | | | | | | | the | | | | | | | | envelop | | | | | | | | of AM | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 3 | Give | 2 | | | | | | | the | | | | | | | | bandwid | | | | | | | | th | | | | | | | | of AM. | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 4 | | 2 | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 5 | | 2 | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 6 | | 2 | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 7 | | 2 | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 8 | | 2 | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 9 | Analyse | 2 | | | | | | | the | | | | | | | | concept | | | | | | | | of | | | | | | | | baseban | | | | | | | | d | | | | | | | | and | | | | | | | | passban | | | | | | | | d | | | | | | | | transmi | | | | | | | | ssion. | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 10 | | 2 | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 11 | | 2 | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 12 | A 400 W | 2 | | | | | | | carrier | | | | | | | | is | | | | | | | | modulat | | | | | | | | ed | | | | | | | | to a | | | | | | | | depth | | | | | | | | of 75%. | | | | | | | | Calcula | | | | | | | | te | | | | | | | | the | | | | | | | | total | | | | | | | | power | | | | | | | | in the | | | | | | | | modulat | | | | | | | | ed | | | | | | | | wave. | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 13 | Identif | 2 | | | | | | | y | | | | | | | | the | | | | | | | | modulat | | | | | | | | ion | | | | | | | | index | | | | | | | | for an | | | | | | | | amplitu | | | | | | | | de | | | | | | | | modulat | | | | | | | | ion. | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 14 | If a | 2 | | | | | | | 10V | | | | | | | | carrier | | | | | | | | is | | | | | | | | amplitu | | | | | | | | de | | | | | | | | modulat | | | | | | | | ed | | | | | | | | by two | | | | | | | | differe | | | | | | | | nt | | | | | | | | frequen | | | | | | | | cies | | | | | | | | with | | | | | | | | amplitu | | | | | | | | des | | | | | | | | 2V & 3V | | | | | | | | respect | | | | | | | | ively. | | | | | | | | Find | | | | | | | | the | | | | | | | | value | | | | | | | | of | | | | | | | | modulat | | | | | | | | ion | | | | | | | | index. | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 15 | Propose | 2 | | | | | | | the | | | | | | | | spectru | | | | | | | | m | | | | | | | | of AM | | | | | | | | signal | | | | | | | | and | | | | | | | | explain | | | | | | | |. | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 16 | Summari | 2 | | | | | | | ze | | | | | | | | the | | | | | | | | advanta | | | | | | | | ges | | | | | | | | of | | | | | | | | SSBSC | | | | | | | | modulat | | | | | | | | ion. | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 17 | Classif | 2 | | | | | | | y | | | | | | | | amplitu | | | | | | | | de | | | | | | | | and | | | | | | | | angle | | | | | | | | modulat | | | | | | | | ion. | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 18 | What is | 2 | | | | | | | Guard | | | | | | | | band? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 19 | Explain | 2 | | | | | | | the | | | | | | | | terms | | | | | | | | bandwid | | | | | | | | th | | | | | | | | and | | | | | | | | informa | | | | | | | | tion | | | | | | | | capacit | | | | | | | | y | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 20 | What do | 2 | | | | | | | you | | | | | | | | mean | | | | | | | | bit | | | | | | | | rate | | | | | | | | and | | | | | | | | baud | | | | | | | | rate? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 21 | Define | 2 | | | | | | | amplitu | | | | | | | | de | | | | | | | | demodul | | | | | | | | ation | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 22 | Define | 2 | | | | | | | Freqeny | | | | | | | | modulat | | | | | | | | ion | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 23 | Define | 2 | | | | | | | phase | | | | | | | | modulat | | | | | | | | ion | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 24 | Define | 2 | | | | | | | DSB-SC | | | | | | | | Modulat | | | | | | | | ion | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 25 | What is | 2 | | | | | | | single | | | | | | | | tone | | | | | | | | modulat | | | | | | | | ion? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 26 | What is | 2 | | | | | | | multi | | | | | | | | tone | | | | | | | | modulat | | | | | | | | ion? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 27 | What is | 2 | | | | | | | VSB? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 28 | State | 2 | | | | | | | samplin | | | | | | | | g | | | | | | | | theorem | | | | | | | |. | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 29 | Mention | 2 | | | | | | | its | | | | | | | | applica | | | | | | | | tions | | | | | | | | of | | | | | | | | modulat | | | | | | | | ion? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 30 | How is | 2 | | | | | | | TDM | | | | | | | | differe | | | | | | | | nt | | | | | | | | from | | | | | | | | FDM? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 31 | Draw | 2 | | | | | | | the | | | | | | | | spectru | | | | | | | | m | | | | | | | | of SSB | | | | | | | | modulat | | | | | | | | ed | | | | | | | | signal? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 32 | Draw | 2 | | | | | | | the | | | | | | | | spectru | | | | | | | | m | | | | | | | | of VSB | | | | | | | | modulat | | | | | | | | ed | | | | | | | | signal? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 33 | Write | 2 | | | | | | | the | | | | | | | | express | | | | | | | | ion | | | | | | | | for SSB | | | | | | | | and VSB | | | | | | | | Waves. | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 34 | What | 2 | | | | | | | are the | | | | | | | | methods | | | | | | | | for SSB | | | | | | | | generat | | | | | | | | ion? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 35 | ### Lis | 2 | | | | | | | t Appli | | | | | | | | cation | | | | | | | | of SSB? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 36 | ### Wha | 2 | | | | | | | t are t | | | | | | | | he adva | | | | | | | | ntages | | | | | | | | of VSB | | | | | | | | system | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 37 | ### Def | 2 | | | | | | | ine SSB | | | | | | | | -SC sys | | | | | | | | tem | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 38 | ### Wha | 2 | | | | | | | t are t | | | | | | | | he disa | | | | | | | | dvantag | | | | | | | | es of s | | | | | | | | ingle s | | | | | | | | ide ban | | | | | | | | d trans | | | | | | | | mission | | | | | | | | ? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 39 | ### Wha | 2 | | | | | | | t are t | | | | | | | | he meth | | | | | | | | ods for | | | | | | | | genera | | | | | | | | ting SS | | | | | | | | B-SC si | | | | | | | | gnal? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 40 | ### Wha | 2 | | | | | | | t is th | | | | | | | | e perce | | | | | | | | ntage o | | | | | | | | f power | | | | | | | | saving | | | | | | | | in SSB | | | | | | | | modula | | | | | | | | tion? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 41 | List | 2 | | | | | | | the | | | | | | | | advanta | | | | | | | | ges | | | | | | | | of SSB | | | | | | | | transmi | | | | | | | | ssion. | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 42 | What is | 2 | | | | | | | the | | | | | | | | differe | | | | | | | | nce | | | | | | | | between | | | | | | | | VSB and | | | | | | | | DSB? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 43 | What is | 2 | | | | | | | VSB | | | | | | | | Transmi | | | | | | | | ssion? | | | | | | | | How is | | | | | | | | it used | | | | | | | | in TV | | | | | | | | broadca | | | | | | | | st? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 44 | What | 2 | | | | | | | are the | | | | | | | | advanta | | | | | | | | ges | | | | | | | | of VSB | | | | | | | | system | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 45 | Define | 2 | | | | | | | SSB-SC | | | | | | | | system | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 46 | What | 2 | | | | | | | are the | | | | | | | | disadva | | | | | | | | ntages | | | | | | | | of | | | | | | | | single | | | | | | | | side | | | | | | | | band | | | | | | | | transmi | | | | | | | | ssion? | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 47 | Draw | 2 | | | | | | | one | | | | | | | | cycle | | | | | | | | of AM | | | | | | | | wave & | | | | | | | | Calcula | | | | | | | | te | | | | | | | | the | | | | | | | | modulat | | | | | | | | ion | | | | | | | | index | | | | | | | | in | | | | | | | | terms | | | | | | | | of | | | | | | | | Vmax&Vm | | | | | | | | in. | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 48 | Draw | 2 | | | | | | | the | | | | | | | | wavefor | | | | | | | | ms | | | | | | | | of AM | | | | | | | | signal | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 49 | If a | 2 | | | | | | | modulat | | | | | | | | ed | | | | | | | | wave | | | | | | | | with an | | | | | | | | average | | | | | | | | voltage | | | | | | | | of 20Vp | | | | | | | | changes | | | | | | | | in | | | | | | | | amplitu | | | | | | | | de | | | | | | | | ±5V, | | | | | | | | determi | | | | | | | | ne | | | | | | | | the | | | | | | | | maximum | | | | | | | | and | | | | | | | | minimum | | | | | | | | envelop | | | | | | | | e | | | | | | | | amplitu | | | | | | | | des | | | | | | | | and the | | | | | | | | modulat | | | | | | | | ion | | | | | | | | coeffic | | | | | | | | ients. | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 50 | List | 2 | | | | | | | the | | | | | | | | sourses | | | | | | | | of | | | | | | | | interna | | | | | | | | l | | | | | | | | and | | | | | | | | externa | | | | | | | | l | | | | | | | | noise | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 51 | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 52 | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 53 | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 54 | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 55 | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 56 | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 57 | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 58 | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 59 | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | 60 | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | **Secti | | | | | | | | on | | | | | | | | B(Subje | | | | | | | | ctive) | | | | | | | | -- 6 | | | | | | | | marks | | | | | | | | each** | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Explain | 6 | | | | | | | the | | | | | | | | differe | | | | | | | | nce | | | | | | | | between | | | | | | | | analog | | | | | | | | and | | | | | | | | digital | | | | | | | | signals | | | | | | | |. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Explain | 6 | | | | | | | the | | | | | | | | differe | | | | | | | | nt | | | | | | | | types | | | | | | | | of | | | | | | | | signal | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | A Radio | 6 | | | | | | | transmi | | | | | | | | tter | | | | | | | | radiate | | | | | | | | s | | | | | | | | 10 KW | | | | | | | | and | | | | | | | | carrier | | | | | | | | power | | | | | | | | is 8.5 | | | | | | | | KW. | | | | | | | | Calcula | | | | | | | | te | | | | | | | | | | | | | | | | modulat | | | | | | | | ion | | | | | | | | index. | | | | | | | | | | | | | | | | A Radio | | | | | | | | transmi | | | | | | | | tter | | | | | | | | radiate | | | | | | | | s | | | | | | | | 10 KW | | | | | | | | and | | | | | | | | carrier | | | | | | | | power | | | | | | | | is 8.5 | | | | | | | | KW. | | | | | | | | Calcula | | | | | | | | te | | | | | | | | | | | | | | | | modulat | | | | | | | | ion | | | | | | | | index. | | | | | | | | | | | | | | | | A Radio | | | | | | | | transmi | | | | | | | | tter | | | | | | | | radiate | | | | | | | | s | | | | | | | | 10 KW | | | | | | | | and | | | | | | | | carrier | | | | | | | | power | | | | | | | | is 8.5 | | | | | | | | KW. | | | | | | | | Calcula | | | | | | | | te | | | | | | | | | | | | | | | | modulat | | | | | | | | ion | | | | | | | | index. | | | | | | | | | | | | | | | | A Radio | | | | | | | | transmi | | | | | | | | tter | | | | | | | | radiate | | | | | | | | s | | | | | | | | 10 KW | | | | | | | | and | | | | | | | | carrier | | | | | | | | power | | | | | | | | is 8.5 | | | | | | | | KW. | | | | | | | | Calcula | | | | | | | | te | | | | | | | | | | | | | | | | modulat | | | | | | | | ion | | | | | | | | index. | | | | | | | | | | | | | | | | A Radio | | | | | | | | transmi | | | | | | | | tter | | | | | | | | radiate | | | | | | | | s | | | | | | | | 10 KW | | | | | | | | and | | | | | | | | carrier | | | | | | | | power | | | | | | | | is 8.5 | | | | | | | | KW. | | | | | | | | Calcula | | | | | | | | te | | | | | | | | | | | | | | | | modulat | | | | | | | | ion | | | | | | | | index. | | | | | | | | | | | | | | | | A Radio | | | | | | | | transmi | | | | | | | | tter | | | | | | | | radiate | | | | | | | | s | | | | | | | | 10 KW | | | | | | | | and | | | | | | | | carrier | | | | | | | | power | | | | | | | | is 8.5 | | | | | | | | KW. | | | | | | | | Calcula | | | | | | | | te | | | | | | | | | | | | | | | | modulat | | | | | | | | ion | | | | | | | | index. | | | | | | | | | | | | | | | | A Radio | | | | | | | | transmi | | | | | | | | tter | | | | | | | | radiate | | | | | | | | s | | | | | | | | 10 KW | | | | | | | | and | | | | | | | | carrier | | | | | | | | power | | | | | | | | is 8.5 | | | | | | | | KW. | | | | | | | | Calcula | | | | | | | | te | | | | | | | | | | | | | | | | modulat | | | | | | | | ion | | | | | | | | index. | | | | | | | | | | | | | | | | Write | | | | | | | | the | | | | | | | | time | | | | | | | | domain | | | | | | | | represe | | | | | | | | ntation | | | | | | | | of SSB | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Differe | 6 | | | | | | | ntiate | | | | | | | | A.M, | | | | | | | | DSB-SC | | | | | | | | and | | | | | | | | SSB-SC. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Sketch | 6 | | | | | | | SSBSC | | | | | | | | and | | | | | | | | explain | | | | | | | | in | | | | | | | | detail. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Conside | 6 | | | | | | | r | | | | | | | | an AM | | | | | | | | signal | | | | | | | | 𝑥(𝑡) = | | | | | | | | 2 | | | | | | | | cos(2𝜋𝑓 | | | | | | | | 𝑐𝑡) | | | | | | | | +0.5 | | | | | | | | cos(2 | | | | | | | | 𝜋𝑓𝑚𝑡). | | | | | | | | cos(2𝜋𝑓 | | | | | | | | 𝑐𝑡). | | | | | | | | Compute | | | | | | | | the | | | | | | | | modulat | | | | | | | | ion | | | | | | | | index | | | | | | | | used to | | | | | | | | generat | | | | | | | | e | | | | | | | | the | | | | | | | | signal. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | In an | 6 | | | | | | | amplitu | | | | | | | | de | | | | | | | | modulat | | | | | | | | ion | | | | | | | | system, | | | | | | | | the | | | | | | | | carrier | | | | | | | | frequen | | | | | | | | cy | | | | | | | | is 𝑓𝑐 = | | | | | | | | 100𝐾𝐻𝑧. | | | | | | | | The | | | | | | | | maximum | | | | | | | | frequen | | | | | | | | cy | | | | | | | | of the | | | | | | | | signal | | | | | | | | is 5 | | | | | | | | KHz. | | | | | | | | Estimat | | | | | | | | e | | | | | | | | the | | | | | | | | lower & | | | | | | | | uppersi | | | | | | | | de | | | | | | | | bands | | | | | | | | and | | | | | | | | bandwid | | | | | | | | th | | | | | | | | of the | | | | | | | | AM | | | | | | | | signal. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | The | 6 | | | | | | | antenna | | | | | | | | current | | | | | | | | of an | | | | | | | | AM | | | | | | | | transmi | | | | | | | | tter | | | | | | | | is 8 | | | | | | | | Amps, | | | | | | | | when | | | | | | | | only | | | | | | | | the | | | | | | | | carrier | | | | | | | | is | | | | | | | | sent, | | | | | | | | but it | | | | | | | | increas | | | | | | | | es | | | | | | | | to | | | | | | | | 8.93A, | | | | | | | | when | | | | | | | | the | | | | | | | | carrier | | | | | | | | is | | | | | | | | modulat | | | | | | | | ed | | | | | | | | by a | | | | | | | | single | | | | | | | | sine | | | | | | | | wave. | | | | | | | | Find | | | | | | | | percent | | | | | | | | age | | | | | | | | modulat | | | | | | | | ion. | | | | | | | | Determi | | | | | | | | ne | | | | | | | | the | | | | | | | | antenna | | | | | | | | current | | | | | | | | when | | | | | | | | the | | | | | | | | percent | | | | | | | | modulat | | | | | | | | ion | | | | | | | | changes | | | | | | | | to 0.8. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | What | | | | | | | | are the | | | | | | | | differe | | | | | | | | nt | | | | | | | | types | | | | | | | | of | | | | | | | | continu | | | | | | | | ous | | | | | | | | wave | | | | | | | | and | | | | | | | | pulse | | | | | | | | modulat | | | | | | | | ion | | | | | | | | techniq | | | | | | | | ues? | | | | | | | | Define | | | | | | | | them | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Sketch | | | | | | | | the | | | | | | | | envelop | | | | | | | | e | | | | | | | | for a | | | | | | | | maximum | | | | | | | | positiv | | | | | | | | e | | | | | | | | envelop | | | | | | | | e | | | | | | | | voltage | | | | | | | | of 12V | | | | | | | | & | | | | | | | | minimum | | | | | | | | positiv | | | | | | | | e | | | | | | | | envelop | | | | | | | | e | | | | | | | | amplitu | | | | | | | | de | | | | | | | | of 4V; | | | | | | | | determi | | | | | | | | ne | | | | | | | | the | | | | | | | | modulat | | | | | | | | ion | | | | | | | | index & | | | | | | | | percent | | | | | | | | age | | | | | | | | modulat | | | | | | | | ion | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | A 400W | | | | | | | | carrier | | | | | | | | is | | | | | | | | modulat | | | | | | | | ed | | | | | | | | on a | | | | | | | | depth | | | | | | | | of 75%. | | | | | | | | Calcula | | | | | | | | te | | | | | | | | the | | | | | | | | total | | | | | | | | power | | | | | | | | in the | | | | | | | | modulat | | | | | | | | ed | | | | | | | | wave in | | | | | | | | : (i) | | | | | | | | AM (ii) | | | | | | | | DSB SC | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | An AM | | | | | | | | transmi | | | | | | | | tter | | | | | | | | has an | | | | | | | | un-modu | | | | | | | | lated | | | | | | | | carrier | | | | | | | | power | | | | | | | | of | | | | | | | | 10KW.It | | | | | | | | can be | | | | | | | | modulat | | | | | | | | ed | | | | | | | | to a | | | | | | | | max | | | | | | | | depth | | | | | | | | of 40%, | | | | | | | | if the | | | | | | | | modulat | | | | | | | | ion | | | | | | | | index | | | | | | | | is | | | | | | | | reduced | | | | | | | | to 30 | | | | | | | | %. What | | | | | | | | is the | | | | | | | | extent | | | | | | | | of | | | | | | | | carrier | | | | | | | | power | | | | | | | | that | | | | | | | | can be | | | | | | | | increas | | | | | | | | ed | | | | | | | | to | | | | | | | | avoid | | | | | | | | overloa | | | | | | | | ding? | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Explain | | | | | | | | AM time | | | | | | | | domain | | | | | | | | analysi | | | | | | | | s | | | | | | | | and AM | | | | | | | | power | | | | | | | | distrib | | | | | | | | ution. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Draw | | | | | | | | and | | | | | | | | explain | | | | | | | | block | | | | | | | | diagram | | | | | | | | of | | | | | | | | Quadrat | | | | | | | | ure | | | | | | | | amplitu | | | | | | | | de | | | | | | | | modulat | | | | | | | | ion | | | | | | | | (QAM) | | | | | | | | modulat | | | | | | | | or | | | | | | | | and | | | | | | | | demodul | | | | | | | | ator. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Explain | | | | | | | | with | | | | | | | | diagram | | | | | | | | various | | | | | | | | types | | | | | | | | of | | | | | | | | Single | | | | | | | | sideban | | | | | | | | d | | | | | | | | system. | | | | | | | | Compare | | | | | | | | the | | | | | | | | relativ | | | | | | | | e | | | | | | | | power | | | | | | | | distrib | | | | | | | | ution | | | | | | | | and | | | | | | | | frequen | | | | | | | | cy | | | | | | | | spectra | | | | | | | | of | | | | | | | | convent | | | | | | | | ional | | | | | | | | AM and | | | | | | | | Single | | | | | | | | sideban | | | | | | | | d | | | | | | | | (SSB) | | | | | | | | systems | | | | | | | |. | | | | | | | | Draw | | | | | | | | wavefor | | | | | | | | m | | | | | | | | of | | | | | | | | SSBFC | | | | | | | | and | | | | | | | | SSBSC | | | | | | | | signal. | | | | | | | | Compare | | | | | | | | single | | | | | | | | sideban | | | | | | | | d | | | | | | | | transmi | | | | | | | | ssion | | | | | | | | with | | | | | | | | convent | | | | | | | | ional | | | | | | | | AM. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Compare | | | | | | | | with | | | | | | | | wavefor | | | | | | | | ms | | | | | | | | followi | | | | | | | | ng | | | | | | | | AM | | | | | | | | transmi | | | | | | | | ssion | | | | | | | | systems | | | | | | | | :- | | | | | | | | DSBSC | | | | | | | | ,SSBSC | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | What | | | | | | | | are the | | | | | | | | advanta | | | | | | | | ges | | | | | | | | of | | | | | | | | Single | | | | | | | | sideban | | | | | | | | d | | | | | | | | transmi | | | | | | | | ssion? | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Draw | | | | | | | | and | | | | | | | | explain | | | | | | | | followi | | | | | | | | ng | | | | | | | | circuit | | | | | | | | diagram | | | | | | | | s | | | | | | | | for | | | | | | | | single | | | | | | | | sideban | | | | | | | | d | | | | | | | | generat | | | | | | | | ion:- | | | | | | | | Balance | | | | | | | | d | | | | | | | | ring | | | | | | | | modulat | | | | | | | | or,. | | | | | | | | Balance | | | | | | | | d | | | | | | | | Bridge | | | | | | | | modulat | | | | | | | | or | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Draw | | | | | | | | and | | | | | | | | explain | | | | | | | | block | | | | | | | | diagram | | | | | | | | of :- | | | | | | | | A) | | | | | | | | Noncohe | | | | | | | | rent | | | | | | | | SSB | | | | | | | | receive | | | | | | | | r | | | | | | | | B) | | | | | | | | Coheren | | | | | | | | t | | | | | | | | SSB | | | | | | | | receive | | | | | | | | r | | | | | | | | C) | | | | | | | | Single | | | | | | | | sideban | | | | | | | | d | | | | | | | | envelop | | | | | | | | e | | | | | | | | detecti | | | | | | | | on | | | | | | | | receive | | | | | | | | r | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Draw | | | | | | | | wavefor | | | | | | | | ms | | | | | | | | for the | | | | | | | | followi | | | | | | | | ng: | | | | | | | | - a) | | | | | | | | Pulse | | | | | | | | modulat | | | | | | | | ion | | | | | | | | a) | | | | | | | | Sample | | | | | | | | pulse | | | | | | | | b) PWM | | | | | | | | c) PPM | | | | | | | | d) PAM | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | What do | | | | | | | | you | | | | | | | | mean by | | | | | | | | pulse | | | | | | | | modulat | | | | | | | | ion | | | | | | | | and | | | | | | | | define | | | | | | | | types | | | | | | | | of | | | | | | | | pulse | | | | | | | | modulat | | | | | | | | ion? | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Explain | | | | | | | | the | | | | | | | | princip | | | | | | | | les | | | | | | | | of | | | | | | | | amplitu | | | | | | | | de | | | | | | | | modulat | | | | | | | | ion | | | | | | | | its | | | | | | | | generat | | | | | | | | ion | | | | | | | | and | | | | | | | | detecti | | | | | | | | on. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Write a | | | | | | | | note on | | | | | | | | frequen | | | | | | | | cy | | | | | | | | spectru | | | | | | | | m | | | | | | | | analysi | | | | | | | | s | | | | | | | | of | | | | | | | | angle | | | | | | | | modulat | | | | | | | | ed | | | | | | | | waves | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Derive | | | | | | | | the | | | | | | | | relatio | | | | | | | | nship | | | | | | | | between | | | | | | | | the | | | | | | | | voltage | | | | | | | | amplitu | | | | | | | | des | | | | | | | | of the | | | | | | | | side | | | | | | | | band | | | | | | | | frequen | | | | | | | | cies | | | | | | | | and the | | | | | | | | carrier | | | | | | | | and | | | | | | | | draw | | | | | | | | the | | | | | | | | frequen | | | | | | | | cy | | | | | | | | spectru | | | | | | | | m. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | In an | | | | | | | | AM | | | | | | | | modulat | | | | | | | | or, | | | | | | | | 500 KHz | | | | | | | | carrier | | | | | | | | of | | | | | | | | amplitu | | | | | | | | de | | | | | | | | 20 V is | | | | | | | | modulat | | | | | | | | ed | | | | | | | | by 10 | | | | | | | | KHz | | | | | | | | modulat | | | | | | | | ing | | | | | | | | signal | | | | | | | | which | | | | | | | | causes | | | | | | | | a | | | | | | | | change | | | | | | | | in the | | | | | | | | output | | | | | | | | wave of | | | | | | | | +\_ 7.5 | | | | | | | | V. | | | | | | | | Determi | | | | | | | | ne: | | | | | | | | (1) | | | | | | | | Upper | | | | | | | | and | | | | | | | | lower | | | | | | | | side | | | | | | | | band | | | | | | | | frequen | | | | | | | | cies | | | | | | | | (2) | | | | | | | | Modulat | | | | | | | | ion | | | | | | | | Index | | | | | | | | (3) | | | | | | | | Peak | | | | | | | | amplitu | | | | | | | | de | | | | | | | | of | | | | | | | | upper | | | | | | | | and | | | | | | | | lower | | | | | | | | side | | | | | | | | frequen | | | | | | | | cy | | | | | | | | (4) | | | | | | | | Maximum | | | | | | | | and | | | | | | | | minimum | | | | | | | | amplitu | | | | | | | | des | | | | | | | | of | | | | | | | | envelop | | | | | | | | e. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | With | | | | | | | | the | | | | | | | | help of | | | | | | | | neat | | | | | | | | block | | | | | | | | diagram | | | | | | | | explain | | | | | | | | about | | | | | | | | the | | | | | | | | generat | | | | | | | | ion | | | | | | | | of | | | | | | | | SSBSC | | | | | | | | wave | | | | | | | | and | | | | | | | | demodul | | | | | | | | ation. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Draw | | | | | | | | The | | | | | | | | Amplitu | | | | | | | | de | | | | | | | | Modulat | | | | | | | | ion | | | | | | | | Wave | | | | | | | | Forms | | | | | | | | With | | | | | | | | Modulat | | | | | | | | ion | | | | | | | | Index | | | | | | | | (m) =1, | | | | | | | | m1. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Define | | | | | | | | AM. | | | | | | | | Derive | | | | | | | | the | | | | | | | | express | | | | | | | | ion | | | | | | | | for AM | | | | | | | | wave | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | **Defin | | | | | | | | e | | | | | | | | FDM?Dra | | | | | | | | w | | | | | | | | the | | | | | | | | block | | | | | | | | diagram | | | | | | | |.** | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Explain | | | | | | | | Envelop | | | | | | | | Detecti | | | | | | | | on | | | | | | | | of AM | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | **Secti | | | | | | | | on | | | | | | | | C(Subje | | | | | | | | ctive)- | | | | | | | | 8 marks | | | | | | | | each** | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Draw | 8 | | | | | | | the | | | | | | | | block | | | | | | | | diagram | | | | | | | | of | | | | | | | | communi | | | | | | | | cation | | | | | | | | system. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | 2 | With | 8 | | | | | | | necessa | | | | | | | | ry | | | | | | | | express | | | | | | | | ions, | | | | | | | | Explain | | | | | | | | single- | | | | | | | | tone | | | | | | | | AM | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Derive | 8 | | | | | | | an | | | | | | | | express | | | | | | | | ion | | | | | | | | for the | | | | | | | | power | | | | | | | | content | | | | | | | | and | | | | | | | | transmi | | | | | | | | ssion | | | | | | | | efficie | | | | | | | | ncy | | | | | | | | of | | | | | | | | single | | | | | | | | tone | | | | | | | | amplitu | | | | | | | | de | | | | | | | | modulat | | | | | | | | ed | | | | | | | | signal | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Draw | 8 | | | | | | | the | | | | | | | | frequen | | | | | | | | cy | | | | | | | | spectru | | | | | | | | m | | | | | | | | of | | | | | | | | DSB-SC | | | | | | | | modulat | | | | | | | | ion | | | | | | | | with | | | | | | | | necessa | | | | | | | | ry | | | | | | | | mathema | | | | | | | | tical | | | | | | | | express | | | | | | | | ions. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Explain | 8 | | | | | | | the | | | | | | | | differe | | | | | | | | nt | | | | | | | | types | | | | | | | | of the | | | | | | | | communi | | | | | | | | cation | | | | | | | | channel | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | Generat | 8 | | | | | | | e | | | | | | | | DSB-SC | | | | | | | | signal | | | | | | | | with | | | | | | | | the | | | | | | | | help of | | | | | | | | ring | | | | | | | | modulat | | | | | | | | or | | | | | | | | using | | | | | | | | diodes, | | | | | | | | with a | | | | | | | | neat | | | | | | | | sketch | | | | | | | | of | | | | | | | | wavefor | | | | | | | | ms. | | | | | | +---------+---------+---------+---------+---------+---------+---------+ | | A | 8 | | | | | | | carrier | | | | | | | | wave of | | | | | | | | frequen | | | | | | | | cy | | | | | | | | 10 MHz | | | | | | | | and | | | | | | | | peak | | | | | | | | value | | | | | | | | 10V is | | | | | | | | amplitu | | | | | | | | de | | | | | | | | modulat | | | | | | | | ed | | | | | | | | by | | | | | | | | | | | | | | | | a 5 KHz | | | | | | | | sine | | | | | | | | wave of | | | | | | | | amplitu | | | | | | | | de | | | | | | | | 6V. | | | | | | | | Determi | | | | | | | | ne | | | | | | | | the | | | | | | | | modulat | | | | | | | | ion | | | | | | | | index | | | | | | | | and | | | | | | | | amplitu | | | | | | | | de | | | | | | | | | | | | | | | | of the | | | | | | | | side | | | | | | | | frequen | | | | | | | | cies. | | | | | | | | | | | | | | | | A | | | | | | | | carrier | | | | | | | | wave of | | | | | | | | frequen | | | | | | | | cy | | | | | | | | 10 MHz | | | | | | | | and | | | | | | | | peak | | | | | | | | value | | | | | | | | 10V is | | | | | | | | amplitu | | | | | | | | de | | | | | | | | modulat | | | | | | | | ed | | | | | | | | by | | | | | | | | | | | | | | | | a 5 KHz | | | | | | | | sine | | | | | | | | wave of | | | | | | | | amplitu | | | | | | | | de | | | | | | | | 6V. | | | | | | | | Determi | | | | | | | | ne | | | | | | | | the | | | | | | | | modulat | | | | | | | | ion | | | | | | | | index | | | | | | | | and | | | | | | | | amplitu | | | | | | | | de | | | | | | | | | | | | | | | | o A | | | | | | | | carrier | | | | | | | | wave of | | | | | | | | frequen | | | | | | | | cy | | | | | | | | 10 MHz | | | | | | | | and | | | | | | | | peak | | | | | | | | value | | | | | | | | 10V is | | | | | | | | amplitu | | | | | | | | de | | | | | | | | modulat | | | | | | | | ed | | | | | | | | by | | | | | | | | | | | | | | | | a 5 KHz | | | | | | | | sine | | | | | | | | wave of | | | | | | | | amplitu | | | | | | | | de | | | | | | | | 6V. | | | | | | | | Determi | | | | | | | | ne | | | | | | | | the | | | | | | | | modulat | | | | | | | | ion | | | | | | | | index | | | | | | | | and | | | | | | | | amplitu | | | | | | | | de | | | | | | | | | | | | | | | | of the | | | | | | | | side | | | | | | | | frequen | | | | | | | | cies. | | | | | | | | | | | | | | | | f A | | | | | | | | carrier | | | | | | | | wave of | | | | | | | | frequen | | | | | | | | cy | | | | | | | | 10 MHz | | | | | | | | and | | | | | | | | peak | | | | | | | | value | | | | | | | | 10V is |