Descripción: examen tema numero 2 de Ace! 5 oxford para quinto de primaria
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SUBJECT NAME & CODE: ANALOG COMMUNICATION (5EC04) NAME OF FACULTY FACULTY:: Ms. DIVYA SIGGER SIGG ER UNIT-2 UNIT-2 AMLITUDE AMLIT UDE MODULATION MODULATION
Q.1 In a 100% amplitude modulated signal,if the total transmitted power is P,then P,then the carrier power will be a) 2/P 2/P b) 1/2P 1/2P c) 1/P 1/P d) 1/!P 1/!P Q.2 "or an #$ wae haing a power of &00' at its carrier fre(uenc and modulation inde* of +0%,thepower content of each side band is a) &1' b) 12' c) 200' d) !00' Q. In a - sstem with 100% modulation,the power saing is a) 0% b) % c)3% d)100% Q.! # ! 456 carrier is amplitude 7modulated b a lowpass signal of ma*imum cutoff fre(uenc 1$56 if this signal is to be ideall sampled, the minimum sampling fre(uenc should be nearl a) !$56 b) !456 c)&$56 d) &456 Q. If the modulation inde* of an #$ wae is changed from 0 to 1,the transmitted power a)increase b 0% b)increase b 3% c) increase b 100% d)remains unaffected Q. # modulator is a deice de ice to a)separate two fre(uencies b) Impress the information on to a radio fre(uenc carrier c)8*tract information from the carrier d)#mplif the audio fre(uenc signal. Q.3 In #$, the percentage of total power in sideband is a)10% b)1.3% c)2.!% d)3.% Q.& In #$,the modulation enelop has a pea9 alue which is double the unmodulated carrier alue.'hat is the alue of the modulation inde*: a) 2% b) 0% c) 3% d) 100% Q.+ ;he capacitor charging time in the #$ enelop demodulator is based on the time for one a) half ccle of the carrier fre(uenc b) (uarter ccle of lowest audio fre(uenc c) half ccle of the lowest audio fre(uenc d)(uarter ccle of the highest audio fre(uenc Q.10 'hich of the following desirable features are possessed b in comparison to #$: a) less less power isis re(uired b) andwidth re(uired is less c)antenna si! b) 2,>! c)1>2 d) 1,2>! Q.11 'hich of the following signals can be detected b an enelop detector:
a) - b) -full carrier c) "re(uenc modulated signal d) Q.12 "or a single amplitude modulated to depth of 100% b a sinusoidal signal,the power is as the power of unmodulated carrier a) same b) s(uare root of 2 times c)1. times d)twice Q.1 # carrier is simultaneousl modulated b two sine waes with modulation indices of 0. > 0.!.If the modulated power is 10?',what is the total modulated power. a) 11.2?' b) 10?' c) 11.2 ?' d) 10.?' Q.1! ;he enelope detector is/an a) snchronous detector b) asnchronous detector c) product demodulator d)coherent detector Q.1 In a low leel modulation #$ sstem,the amplifers following the modulated stage can be a) liner amplifers b) harmonic generators c)class power amplifiers d) class untuned amplifier Q.1 ;he choice of the product @ in a simple enelop detector using a diode and @ c9t is goerned b a)oth the lowest and the highest modulation fre(uencies b) the depth of modulation and the lowest modulation c) the highest modulation fre(uenc and depth of modulation d) the carrier fre(uenc Q.13 # 10?' carrier is sinsoidall modulated b two carriers corresponding to a modulation inde* of 0% and !0% resp.;he total radiated power is a) 11.2?' b) 10?' c) 11.2 ?' d) 10.?' Q.1& In an amplitude modulated sstem,if the total power is 00' and the power in carrier is !00',then the modulation inde* is a) 0. b) 0.3 c)0.+ d) 1 Q.1+ ;he modulation inde* of an #$ is changed from 0 to 1.5ow dows the transmitted power change: a) 4ets haled b) gets doubled c) gets increased b 0% d) @emains Q.20 # - signal is generated using the carrier cosAwctB C) and modulating signal *At).;he enelope of the - signal is a) *At) b) D*At)D c) onl Be portion of *At) d) *At) cosC
