Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q :In AM a plot of modulation index verses carrier amplitude yields a A)horizontal line B) vertical line C) parabola D) hyperbola Correct Answer : hyperbola Q :When a broadcast AM transmitter is 50 modulated! its antenna current is "#A$ What will be the current when the modulation depth is increased to %0 & A)12.9 A B) 13.4 A C) 16.6 A D) 21.8 A Correct Answer : "'$( A Q :In amplitude modulation! the carrier and the modulatin) volta)es are )iven by *he modulation index will be A) B) C) D) Correct Answer : Q: A)
B) C) D) Correct Answer : Q :A sinusoidal volta)e amplitude modulates another sinusoidal volta)e of amplitude " +, to result in two sideband terms of amplitude #00 volts each$ *he modulation index is A)0.5 B) 0.4 C) 0.2 D) 0.1 Correct Answer : 0$( Q :A carrier is simultaneously modulated by two sine waves with modulation indices of 0$' and 0$(- the total modulation index A)i 1 B) cannot be calc!late" !nle the phae relation are #no$n C) i 0.5 D) i 0.% Correct Answer : is 0$5 Q: A) B) C) D) Correct Answer : Q :In amplitude modulation the carrier power at "00 modulation is A)3% & B) 6% & C) 20 & D) 80 & Correct Answer : ./ Q :A transmitter radiates % +W with the carrier unmodulated and "0$"#5 +W when the carrier is sinosoidally modulated$*he modulation index will be A)40 & B) 44 & C) 50 & D) 66 & Correct Answer : 50 Q :*he positive 1 pea+s of an AM volta)e rise to a maximum value of "# , and drop to a minimum value of ( ,$ *he modulation index assumin) sin)le tone modulation is A)3
B) C) D) Correct Answer : Q :An AM wave is )iven by of the envelope is A)0.4 B) 0.5 C) 0.3 D) 0.9 Correct Answer : 0$5
*he modulation index
Q :In AM! the modulation envelope has a pea+ value double the un modulated carrier level! When the modulation is A)25 & B) 33 & C) 50 & D) 100 & Correct Answer : "00 Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q :*he antenna current of an AM transmitter is 2 amperes when only the carrier is sent$ It increases to 2$2 amperes when the carrier is sinusoidally modulated$ *he percenta)e modulation is A)64 &
B) %2 & C) %8 & D) 84 & Correct Answer : .( Q :*he antenna current of an AM transmitter is 2 amperes when only the carrier is sent$ It increases to 2$2 amperes when the carrier is sinusoidally modulated$ *he percenta)e modulation is What will be the antenna current when the depth of modulation is 20 & A)8.8 A B) 9.19 A C) 9.91 A D) 10 A Correct Answer : %$"% A Q: A) B) C) D) Correct Answer : Q :An audio si)nal "5 sin # 3"000 t 4 amplitude modulates /5 sin # 3"00!000 t4 $ *he modulation index will be A)20 & B) 25 & C) 50 & D) 80 & Correct Answer : #0 Q :In an AM si)nal pea+ antenna current is "#A and the minimum is 'A *he percenta)e modulation is A)100 percent B) 60 'ercent C) 50 'ercent D) 40 'ercent Correct Answer : .0 ercent Q: A) B) C) D) Correct Answer : Q: A)
B) C) D) Correct Answer : Q :A carrier is amplitude modulated to a depth of (0 $ *he increase in power is A)40 & B) 20 & C) 16 & D) 8 & Correct Answer : 2 Q :*he ratio of the total power in amplitude modulated wave to the unmodulated carrier power is )iven by A) ( 1*+2 B) ( 1,*+2 C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q :A transmitter radiates % +W with the carrier unmodulated and "0$"#5 +W when the carrier is sinusoidally modulated$ If another sine wave! correspondin) to (0 modulation! also modulates the carrier simultaneously! determine the total radiated power A)9.9 #B) 10#C) 10.42 #D) 10.84 #- Correct Answer : "0$2( +Ws Q: A) B) C) D) Correct Answer : Q :A carrier volta)e of unmodulated carrier power " +W is bein) amplitude modulated by an audio sinusoidal volta)e to a depth of "00 has total modulated carrier power of A)1.25 $
B) 1.5C) 1.%5 #D) 2#Correct Answer : "$56W Q :If the carrier of a "00 percent modulated AM wave is suppressed! the percenta)e power savin) will be A)50 B) 150 C) 100 D) 6% Correct Answer : ./ Q :*he modulation index of an AM wave is chan)ed from 0 to "$ *he transmitted power is A)!nchan/e" B) halve" C) "o!ble" D) increae" by 50 percent Correct Answer : increased by 50 percent Q :A #00 W carrier is modulated to a depth of /5 percent$ *he power of the modulated wave will be A)128.1 B) 256.2 C) 512.5 D) 886.6 Correct Answer : 5"#$5 W Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q :A '.0 W carrier is simultaneously modulated by two audio waves with modulation percenta)e of 55 and .5 respectively$ *he total side band power radiated will be A)180B) 130 -
C) 60 D) 30 Correct Answer : "'0 W Q :An AM radio transmitter radiates 50 +W of carrier power$ *he radiated power with 25 modulation will be A)50.85 #B) 51.% #C) 59.9 #D) 68.1 #Correct Answer : .2$" +W Q: A) B) C) D) Correct Answer : Q :A boardcast radio transmitter radiates #0 +W when the modulation percenta)e is .0$ *he carrier power will be A)12 #B) 14.5 #C) 16.94 #D) 20 #Correct Answer : ".$%( +W Q :*he output current of a .0 modulated AM )enerator is "$5 A$ What will be the percenta)e power savin) if the carrier and one of the side bands are now suppressed & A)85 & B) %0 & C) 60 & D) 45 & Correct Answer : 25 Q :When C is the power of the unmodulated si)nal and m is the modulation index then power of the modulated si)nal is )iven by A) *'C B) *2 'C C) D) Correct Answer : Q :If the carrier of a "00 percent modulated AM wave is suppressed! the percenta)e power savin) will be A)50
B) 6% C) 100 D) 150 Correct Answer : ./ Q: A) B) C) D) Correct Answer : Q :An amplitude modulated current is )iven by I7 "08"90$5 sin .#20tsin3'$"(;"000004t $*he modulation index of the wave is A)0.1 B) 0.5 C) 10 & D) 1. Correct Answer : 0$5 Q :1or a si)nal amplitude modulated to a depth of "00 by a sinusoidal si)nal! the power is A)a*e a the po$er o !n*o"!late" carrier B) t$ice a the po$er o !n*o"!late" carrier C) o!r ti*e the po$er o !n*o"!late" carrier D) ne an" hal ti*e the po$er o !n*o"!late" carrier. Correct Answer :
D) Correct Answer : Q :1 power amplifiers of the ummodulated carrier si)nal usually operate at A)Cla A B) Cla B C) Cla AB D) Cla C. Correct Answer : Class C$ Q: A) B) C) D) Correct Answer : Q :*he followin) is an advanta)e of linear modulation A)lar/e *o"!latin/ po$er B) le "itortion C) carrier po$er i le D) *o"!latin/ po$er i le. Correct Answer : less distortion Q :In a low=level AM system! amplifiers followin) the modulated sta)e must be A)linear "evice B) har*onic "evice C) cla C a*pliier D) non linear "evice Correct Answer : linear devices Q :>?uare law modulation uses A)non linear active "evice B) linear active "evice C) non linear paive "evice D) inear paive "evice Correct Answer : non linear active device Q :*he most suitable method for detectin) 1M si)nal is A)envelope "etector B) ynchrono! "etector C) ratio "etector D) !are la$ "etector Correct Answer : ratio detector Q:
A) B) C) D) Correct Answer : Q :Modulated amplifier is operated as an amplifier under class A)AB B) B C) C D) A Correct Answer : C Q :A balanced modulator produces A)A B) B C) DB D) 7B Correct Answer : @> Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q :*he output current of a .0 modulated AM )enerator is "$5 A$ *o what value will this current chan)e if the )enerator is modulated additionally by another audio wave whose modulation index is 0$/ A)1.05 A B) 1.15 A C) 1.35 A D) 1.65 A Correct Answer : "$.5 A Q: A) B)
C) D) Correct Answer : Q :A sinusoidal volta)e of amplitude " 6, amplitude modulated by another sinusoidal volta)e produce '0 modulation$ *he amplitude of each side band term is A)300 7 B) 150 7 C) 500 7 D) 100 7 Correct Answer : "50 , Q :Which of the followin) fre?uency is li+ely to be associated with AM radio broadcast& A)1000#z B) 100z C) 500 z D) 10z Correct Answer : "000+B Q: A) B) C) D) Correct Answer : Q :*he followin) is not the purpose of modulation A)*!ltiple:in/ B) eective ra"iation C) ;arro$ ban"in/ D) increae in i/nal po$er Correct Answer : increase in si)nal power Q :In amplitude modulation! the carrier and the modulatin) volta)es are )iven by *he pea+ amplitude of the amplitude modulated volta)e will be A) B) C) D) Correct Answer : Q :@urin) amplitude modulation! the phase an)le of the modulatin) volta)e chan)es by A)0 "e/ree B) 90 "e/ree C) 180 "e/ree
D) 45 "e/ree Correct Answer : 0 de)rees Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q :1or broadcastin) purpose! full AM si)nal is preferred to >>> si)nal because A)it re!ire lar/e ban"$i"th B) /eneration o !ll A i eaier C) "etection o !ll A i i*pler D) re!ire le ban"$i"th Correct Answer : detection of full AM is simpler Q: A) B) C) D) Correct Answer : Q :An amplitude modulated current is )iven by I7 "08"90$5 sin .#20tsin3'$"(;"000004t$ *he M> value of the carrier current is A) B) C) 10 A D) 5 A Correct Answer : Q :An audio si)nal "5 sin # D 3"000 t4 amplitude modulates /5 sin # D3"00!000 t4 $*he two side band fre?uencies will be A)90 #z an" 110 #z B) 99 #z an" 101 #z C) 99.9 #z an" 100.1 #z D) 99.99 #z an" 100.01 #z Correct Answer : %% +B and "0" +B
Q :If be the simultaneous modulatin) volta)es! then total modulatin) volta)e E t is )iven by A) B) C) D) Correct Answer : Q :In amplitude modulation of modulation index is more than " than A)the ban"$i"th $ill increae B) there $ill intererence $ith other i/nal C) eiciency o tran*iion $ill i*prove D) the $ave $ill /et "itorte". Correct Answer : the wave will )et distorted$ Q :*he unit of modulation index is A)ert< B) C) D) no !nit. Correct Answer : no unit$ Q: A) B) C) D) Correct Answer : Q :An amplitude modulated current is )iven by I7 "08"90$5 sin .#20tsin3'$"(;"000004t *he carrier fre?uency is A)100 z B) 500 z C) 200 z D) 50 z Correct Answer : 50 6B Q :An amplitude modulated current is )iven by I7 "08"90$5 sin .#20tsin3'$"(;"000004t $ *he modulatin) fre?uency is A)100z B) 500z C) 1000z D) 200z Correct Answer : "000B
Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q :*he @>=>C out put si)nal of balanced modulator is A)2 #a =*>t) =c Co -c t B) #a =* >t) =c Co -c t C) 2 =a =c Co -c t D) 2 =c co -c t Correct Answer : # +a Em3t4 Ec Cos Wc t Q: A) B) C) D) Correct Answer : Q :1re?uency translation is the result of A)hetero"yne action B) ilterin/ action C) overlappin/ action D) o"!lation Correct Answer : Modulation Q :*he balanced modulator principle is to eliminate the A)carrier B) *ea/e i/nal C) *o"!late" i/nal D) both carrier an" *ea/e i/nal Correct Answer : carrier Q :*he output of a balanced modulator consists of A)both the i"eban" an" the carrier B) one i"eban" an" carrier C) only carrier
D) only i"eban" an" *o"!latin/ re!ency. Correct Answer : only sidebands and modulatin) fre?uency$ Q: A) B) C) D) Correct Answer : Q :Which of the followin) statement is false& A)the carrier i !ppree" in in/le i"e ban" B) A balance" *o"!lator pro"!ce "o!ble i"e ban" $ith !ppree" carrier C) A in/le i"e ban" i/nal ha one hal the ban"$i"th o a "o!ble "o!b le i"e ban" i/nal D) Ban"$i"th o DB i 1+2 o A Correct Answer : A balanced modulator produces double side bands with suppressed carrier Q :roduct modulators are used in A)A,?C B) DB,C C) ? D) ' Correct Answer : @>=>C Q :*he upper and lower side band fre?uencies for a ' 6B audio modulation with a #/ MB carrier fre?uency will be A)30 an" 24 z B) 2%.3 an" 26.% z C) 2%.3 an" 26.9% z D) 2%.003 an" 26.99% z Correct Answer : #/$00' and #.$%%/ MB Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer :
Q :In suppressed carrier modulation we can save transmission power to the extent of A)6% & B) 33 & C) 20 & D) 40 & Correct Answer : ./ Q: A) B) C) D) Correct Answer : Q :When compared to the AM=1C! the @>=>C bandwidth is A)a*e B) hal C) ininite D) @$o ti*e Correct Answer : same Q :In case of @>=>C! total transmitted power is A) =C2 + 4 B) =c2 +2 C) =c2 + D) Correct Answer : E C# F ( Q :In case of >>=>C the power saved over the AM is A)83.3 & B) 50 & C) 66.6 & D) 60 & Correct Answer : 2'$' Q: A) B) C) D) Correct Answer : Q :When modulatin) si)nal bandwidth is G! the @>=>C bandwidth is A) B)
C) D) Correct Answer : Q :In case of @>=>C wave )eneration! when the messa)e si)nal crosses ero an)le! the phase of modulation wave is A)a*e B) revere" by 1800 C) revere" by D) 00 Correct Answer : reversed by "20 0 Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q :In filter method of >>=>C )eneration how many balanced modulators are used A)1 B) 3 C) 4 D) 5 Correct Answer : " Q :In an >> transmitter! one is most li+ely to find A)cla A ? o!tp!t a*pliier B) cla B ? a*pliier C) cla C a!"io a*pliier D) t!ne" *ol"!lator Correct Answer : class 1 amplifier Q: A) B) C) D) Correct Answer :
Q :In third method of >>=>C )eneration how many balanced modulators are used A)2 B) 3 C) 4 D) 5 Correct Answer : ( Q :Which one of the followin) is not necessarily an advanta)e of the phase cancellation method of obtainin) >> over the filter method& A)t i poible to /enerate B at any re!ency B) B $ith lo$er a!"io re!encie preent can be /enerate" C) $itchin/ ro* one i"e ban" to the other i i*pler D) there are *ore balance" *o"!lator thereore the carrier i !ppree" better. Correct Answer : there are more balanced modulators- therefore the carrier is suppressed better$ Q :In phase shift method of >>=>C )eneration how many balanced modulators are used A)1 B) 2 C) 4 D) 3 Correct Answer : # Q :hase shift method uses A)ne ilter B) @$o ilter C) no ilter D) ?o!r ilter Correct Answer : no filter Q :Which of the followin) method is complicated for >> )eneration A)?ilter *etho" B) $eaverE *etho" C) 'hae hit *etho" D) all are co*plicate" Correct Answer : weaverHs method Q: A) B) C) D) Correct Answer : Q :Which of the followin) filter is )enerally use in >> )eneration&
A)Active ilter B) echanical ilter C) C ilter D) Crytal ilter. Correct Answer : Mechanical filter Q :o of phase shiftin) net wor+s used in phase shift method are A)1 B) 2 C) 3 D) 4 Correct Answer : # Q :and width of >> si)nal when 1 is modulatin) si)nal fre?uency A)? B) 2 ? C) 3 ? D) 4 ? Correct Answer : 1 Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q :In case >> detection! the followin) method is adopted A)ynchrono! "etection B) Aynchrono! "etection C) ;onlinear "etection D) inear "etection Correct Answer : >ynchronous detection Q :*he term neutraliation )enerally refers to A)i*!laneo! *o"!lation re!encie B) *o"!lation at lo$er re!encie C) inhibitin/ p!rio! ocillation D) *o"!lation at hi/her re!encie
Correct Answer : inhibitin) spurious oscillations Q :*he purpose of pilot carrier in >> is A)to provi"e increae" ban"$i"th B) to re"!ce po$er con!*ption C) i*prove" noie i**!nity D) re!ency tabiliation Correct Answer : fre?uency stabilisation Q :selective fadin) is less effective in A)DB , C B) B , C C) A D) ? Correct Answer : >> = >C Q: A) B) C) D) Correct Answer : Q :Which one of the followin) cannot be used to remove the unwanted side band in >>& A)'hae hit "evice B) Balance" *o"!lator C) ?ilter D) i:er Correct Answer : alanced modulator Q :Which of the followin) is invariably found in >>& A)@!ne" *o"!lator B) Cla B ? a*pliier C) Cla C a!"io a*pliier D) Cla A ? a*pliier. Correct Answer : Class 1 amplifier Q :Which of the followin) statement is false& A)a b!er a*pliier can !e the e*itter ollo$er circ!it B) ? po$er a*pliier o the !n*o"!late" carrier i/nal !!ally op erate cla C C) A in/le i"e ban" i/nal ha one hal the ban"$i"th o a "o!ble "o!b le i"e ban" i/nal D) A i"e ban" ilter i "ei/ne" or a ban" o a!"io re!encie Correct Answer : A side band filter is desi)ned for a band of audio fre?uencies Q :Jood ?uality si)nal with very narrow bandwidth is obtained usin) A)A
B) DB , C C) B , C D) ' Correct Answer : >> = >C Q: A) B) C) D) Correct Answer : Q :Which of the followin) circuit cannot be used to demodulate >>& A)B? B) 'ro"!ct "etector C) 'hae "icri*inator D) Balance" *o"!lator. Correct Answer : hase discriminator Q :Which one of the followin) is not necessarily the advanta)e of >> over AM A)i*ple circ!itry B) e po$er han"le" C) e ban"$i"th re!ire" D) o$ noie Correct Answer : >imple circuitry Q :,esti)ial side band is most commonly used in A)a"io tran*iion B) @eleviion tran*iion C) @elephony D) @ele/raphy. Correct Answer : *e *elevision levision transmission Q :In mobile communication the modulation techni?ues used is A)B B) DB C) 7B D) ? Correct Answer : >> Q :*he >> >C e?uation with lower side band transmitted A) B) C) D) Correct Answer :
Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q :*o provide # or more voice circuits with the same carrier! it is necessary to use A)B $ith pilot carrier B) carrier reinertion C) 7eti/ial i"e ban" D) B Correct Answer : I> Q :Indicate in which of the followin) only one side band is transmitted A)A3 B) A3 C) A5C D) A3B Correct Answer : A'B Q :When the modulation index of AM wave is doubled! the antenna current is also doubled the AM system used is A)A3F B) A3 C) A3 D) A5C Correct Answer : A'K Q :In A'K systems! the carrier should be suppressed at the transmitter down to at least A)36"B B) 45"B C) 25"B D) 40"B Correct Answer : (5d Q :*he A 'A modulation is some times used to A)e"!ce the po$er that *!t be tran*itte"
B) e"!ce the ban"$i"th re!ire" or tran*iion C) i*pliy the re!ency tability proble* in reception D) Allo$ the receiver to have a re!ency yntheize Correct Answer : >implify the fre?uency stability problem in reception Q :1i)ure of merit is always unity in A)B,C B) A C) ? D) ' Correct Answer : >>=>C Q: A) B) C) D) Correct Answer : Q :*he maximum number of voice si)nals carried by I> is A)2 B) 1 C) 4 D) 8 Correct Answer : ( Q :In ,B1 *, *ransmission! use of ,> results in a net bandwidth savin) of about A)4.5 z over A3 yte*. B) 5 z over A3 yte* C) 3 hz over A3 yte* D) 3.5 z over A3 yte* Correct Answer : ' Mh over A' system Q: A) B) C) D) Correct Answer : Q :In ,> A)nly one i"e ban" i tran*itte" B) @$o @$o i"e ban" in tran*itte" C) ne i"e ban" i pae" co*pletely co *pletely an" a pot o other i"e ban" i pae". D) ne i"e ban" i tran*itte" alon/ $ith carrier Correct Answer :
Q :Indicate false statement re)ardin) the advanta)es of >> over double side band! full carrier AM A)@he i/nal i *ore noie reitant B) ore channel pace i available C) e po$er i re!ire or the a*e i/nal tren/th D) @ran*itter @ran*itter circ!it *!t be *ore table /ivin/ better reception Correct Answer : *ransmitter circuits must be more stable )ivin) better reception Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q: A)11.5 B) 5.5 C) 6 D) 12 Correct Answer : 5$5
*he modulation index is
Q :An 1M si)nal has a fre?uency deviation of #0 +B produced by #, audio si)nal of (00 B$ What will be that modulation index& A)2.5 B) 4 C) 50 D) 10 Correct Answer : 50 Q: A) B) C) D)
Correct Answer : Q :In an 1M system when the audio fre?uency 3A14 is 500 B and A1 volta)e is #$( ,! the deviation is ($2 +B *he modulation index will be A)10 B) 23 C) 30 D) 400 Correct Answer : '0 Q :In an 1M system when the audio fre?uency 3A14 is 500 B and A1 volta)e is #$( ,! the deviation is (2 +B$ *he modulation index in this case will be A)20 B) 40 C) 80 D) 96 Correct Answer : %. Q :In case of wide band 1M si)nal! the modulation index may be expected to be A)0.5 B) 1.0 C) le than 1 D) *ore than 1 Correct Answer : more than " Q :In fre?uency modulation for a )iven fre?uency deviation! the modulation index varies A)inverely a the *o"!latin/ re!ency B) "irectly a the *o"!latin/ re!ency C) in"epen"ent o *o"!latin/ re!ency D) ?irt varie an" then re*ain contant Correct Answer : inversely as the modulatin) fre?uency Q :Modulation index in an 1$M$ si)nal A)7ari A)7ario! o! inverely a the "eviation B) 7ario! 7ario! "irectly a the *o"!lation re!ency re!en cy C) 7ario! 7ario! "irectly a the re!ency "eviation an" inverely a the *o"!latin/ re!ency D) -hen *!ltiplie" by 100 /ive percenta/e *o"!lation. Correct Answer : ,arious directly as the fre?uency deviation and inversely as the modulatin) fre?uency Q :An 1M si)nal with a modulation index m f is is passed throu)h a fre?uency tripler$ *he wave in the output of the tripler will have a modulation index of A) * + + 3
B) *+ C) 3 * D) 9* Correct Answer : ' m f Q: A) B) C) D) Correct Answer : Q :In fre?uency modulation! the modulation index is proportional to where ome)a m is the modulation fre?uency A) *
B) C) *2 D) Correct Answer : Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q :A fre?uency doubler has an 1M si)nal input at "' MB with a deviation of 5 +B$ what is the fre?uency deviation of the fre?uency doublers output si)nal& A)10#z B) 20 #z C) 25 #z D) 40 #z. Correct Answer : "0+B Q :In an 1M system when the audio fre?uency 3A14 is 500 B and A1 volta)e is #$( ,! the
deviation is ($2 +B If the A1 volta)e is increased to /$5 ,! the new deviation will be A)%.5 #z B) 8 #z C) 9.5 #z D) 15 #z Correct Answer : "5 +B Q :A 1M wave is represented by A)1094.5 z B) 1055.5 z C) 995.5 z D) 995 z Correct Answer : "0%($5 B
*he maximum deviations is
Q: A) B) C) D) Correct Answer : Q :In an 1M system when the audio fre?uency 3A14 is 500 B and A1 volta)e is #$( ,! the deviation is ($2 +B $If the A1 volta)e is raised to "0 , while the A1 is dropped to #00 B! the deviation will be A)15 #z B) 18 #z C) 20 #z D) 22 #z Correct Answer : #0 +B Q :A 1M wave has bandwidth of ".0 +B and modulatin) si)nal fre?uency of 5 +B$ *he fre?uency deviation will be A)%5 #z B) 115 #z C) %5 z D) 115 z Correct Answer : /5 +B Q: A) B) C) D)
Correct Answer : Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q :An 1M si)nal with a deviation 5 is passed throu)h a mixer! and has its fre?uency reduced fivefold$ *he deviation in the output of the mixer is A)3+G B) in"eter*inate C) 5+ G D) G Correct Answer : L Q: A) B) C) D) Correct Answer : Q :In 1M! the fre?uency deviation is A)proportional to *o"!latin/ re!ency B) proportional to a*plit!"e o *o"!latin/ i/nal C) contant D) "irectly proportional to a*plit!"e an" inverely proportional to *o"!latin/ re!ency. Correct Answer : proportional to amplitude of modulatin) si)nal Q :An 1M si)nal with a deviation is passed throu)h a mixer! and has its fre?uency reduced six fold$ *he deviation in the output of the mixer will be A) B) C) H
D) in"eter*inate Correct Answer : Q :In 1M! if the amplitude of the modulatin) volta)e is doubled! the maximum fre?uency deviation A)"o!ble B) beco*e o!r ti*e C) beco*e hal D) re*ain !naltere" Correct Answer : doubles! Q :In 1M! if the fre?uency of the modulatin) volta)e is doubled! the maximum fre?uency deviation A)"o!ble B) beco*e o!r ti*e C) beco*e hal D) re*ain !naltere" Correct Answer : remains unaltered Q: A) B) C) D) Correct Answer : Q :In 1M broadcast! the maximum modulation fre?uency is A)5 #z B) 1 0 #z C) 15 #z D) 25 #z Correct Answer : "5 +B Q: A) B) C) D) Correct Answer : Q: A) B)
C) D) Correct Answer : Q :In 1M A)noie "ecreae by increain/ "eviation B) noie "ecreae by "ecreain/ "eviation C) noie "ecreae by *aintainin/ "eviation contant D) noie increae by *aintainin/ "eviation contant Correct Answer : noise decreases by increasin) deviation Q :Which of the followin) statement is valid for 1M systems& A)t nee" le ban"$i"th B) t oer better +; ratio C) t re!ire leat *o"!latin/ po$er D) ? i i*ilar to DB,C Correct Answer : It offers better >F ratio Q: A) B) C) D) Correct Answer : Q :A fre?uency doubler has an 1M si)nal input at "' MB with a deviation of 5 +B$ *he output fre?uency of the carrier will be A)26 #z B) 260 #z C) 26 z D) 260 z Correct Answer : #. MB Q :A fre?uency multiplier sta)e should operate as A)cla A B) cla B C) cla C D) claAB Correct Answer : class C Q :A 1M wave is represented by A)66 z B) 95.5 z
*he carrier fre?uency is
C) 125 z D) 166 z Correct Answer : %5$5 MB Q :A 1M wave is represented by is A)199 z B) 1990 z C) 199 #z D) 199 z Correct Answer : "%% B
*he modulatin) fre?uency
Q :1M roadcast band )enerally lies in A)? B) ? C) 7? D) ? Correct Answer : ,B1 Q: A) B) C) D) Correct Answer : Q :Which of the followin) fre?uency is li+ely to be associated with 1M radio broadcastin) A)90 z B) 90 #z C) 900 #z D) 90 z. Correct Answer : %0 MB$ Q :@e=emphasis circuit is used A)prior to *o"!lation B) ater *o"!lation C) ?or "e,e*phaiin/ hi/h re!ency co*ponent D) or "e,e*phaiin/ lo$ re!ency co*ponent Correct Answer : 1or de=emphasisin) hi)h fre?uency component Q: A) B)
C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q :>ince noise phase modulates the 1$M$ wave as the carrier fre?uency increases the noise amplitude is A)"ecreae" B) !naltere" C) increae" D) e!alie". Correct Answer : decreased Q :>ine wave of fre?uency fm modulates carrier of fre?uency producin) the same fre?uency deviation and the same modulation index in both 1M and M$ ext if the modulation fre?uency is doubled! the modulation index in 1M relative to that in M will be
A)the a*e B) halve" C) "o!ble" D) !a"r!ple". Correct Answer : halved Q :*he difference between phase and fre?uency modulation A)i p!rely theoretical beca!e they are the a *e in practice B) i too /reat to *a#e the t$o yte* co*patible C) lie in the poorer a!"io repone o phae *o"!lation D) lie in the "ierent "einition o the *o"!lation in"e: Correct Answer : lies in the different definitions of the modulation index Q :pre=emphasis circuit provides extra norse immunity by A)bootin/ the ba re!encie B) a*pliyin/ the hi/her a!"io re!encie C) prea*pliyin/ the $hole a!"io ban" D) convertin/ the phae *o"!lation to ? Correct Answer : amplifyin) the hi)her audio fre?uencies
Q :When the modulatin) fre?uency is doubled! the modulation index is halved! and the modulatin) volta)e remains constant$ *he modulation system is A)a*plit!"e *o"!lation B) phae *o"!lation C) re!ency *o"!lation D) any one o the three Correct Answer : fre?uency modulation Q :Indicate which one of the followin) is not an advanta)e of 1M over AM : A)Better noie i**!nity i provi"e" B) o$er ban"$i"th i re!ire" C) @he tran*itte" po$er i *ore !e!l D) e *o"!latin/ po$er i re!ire" Correct Answer : Nower bandwidth is re?uired Q :1M and AM transmitters are to be compared$ Which of the followin) statement is valid&
A)A tran*itter i *ore eicient a co*pare" to ? tran*itter B) ? tran*itter i *ore eicient a co*pare" to A tran*itter C) ? an" A tran*itter have to a*e eiciency D) =iciency o tran*itter "epen" on re!ency only Correct Answer : 1M transmitter is more efficient as compared to AM transmitter Q: A) B) C) D) Correct Answer : Q :In a modulation system the modulatin) volta)e remains the same the modulatin) index is halved when the modulatin) fre?uency is doubled- the system is & A)A.. B) ?.. C) '.. D) '' Correct Answer : 1$M$ 1$M$ Q :re=emphasis circuit is used A)ater *o"!lation B) prior to *o"!lation C) to increae or e*phai the a*plit!"e o lo$ re!ency co*ponent o the i/nal D) ater "e*o"!lation.
Correct Answer : prior to modulation Q :In the spectrum of a fre?uency modulated wave A)the n!*ber o i/niicant i"eban" "epen" !pon the *o"!lation in"e: B) carrier re!ency cannot "iappear C) carrier re!ency vanihe $hen *o"!lation in"e: i lar/e D) ;!*ber o i"e ban" "epen" on *o"!latin/ i/nal a*plit!"e Correct Answer : the number of si)nificant sidebands depends upon the modulation index Q :In 1M! if the fre?uency of the modulatin) volta)e is doubled! the rate of deviation of carrier fre?uency A)"o!ble B) beco*e o!r ti*e C) beco*e hal D) re*ain !naltere" Correct Answer : doubles Q :In 1M! if the amplitude of the modulatin) volta)e is doubled! the rate of deviation of carrier fre?uency A)"o!ble B) beco*e o!r ti*e C) beco*e hal D) re*ain !naltere" Correct Answer : remains unaltered Q :In the spectrum of a fre?uency=modulated wave A)the carrier re!ency "iappear $hen the *o"!lation in"e: i lar/e B) the a*plit!"e o any i"eban" "epen" on the *o"!lation in"e: C) the total n!*ber o i"eban" "epen" on the *o"!lation in"e: D) the carrier re!ency cannot "iappear Correct Answer : the amplitude of any sideband depends on the modulation index Q :*he messa)e carryin) efficiency is best in A)? B) A C) A, C D) 'hae *o"!lation Correct Answer : AM= >C Q :1ollowin) is not advanta)e of 1M over AM A)noie i**!nity B) i"elity C) capt!re eect i"elity
D) pl!tterin/ Correct Answer : >plutterin) Q :A narrowband 1M does not have the followin) feature A)it ha t$o i"e ban" B) Ban" $i"th i a*e a A C) both i"eban" have a*e phae ph ae "ierence $ith repect to carrier D) it "oe not ho$ a*plit!"e variation Correct Answer : both sidebands have same phase difference with respect to carrier Q: A) B) C) D) Correct Answer : Q :*he commercial 1M radio broadcast band is A)535 to 1600 #z B) 20 to 80 #z C) 88 to 108 z D) 300 to 3000 z Correct Answer : 22 to "02 MB Q :Which system is free from noise& A)? B) A C) Both ? an" A D) DB Correct Answer : 1M Q :
Correct Answer : Q: A) B) C) D) Correct Answer : Q :An 1M si)nal has a fre?uency deviation of #0 +B produced by #, audio si)nal of (00 B$ If there are ei)ht pair of side bands in the 1M si)nal! the re?uired bandwidth will be A) B) C) D) Correct Answer : Q :*he modulatin) fre?uency in fre?uency modulation is increased from "0 +B to #0 +B$ * bandwidth is A)"o!ble" B) halve" C) ncreae by 20 #z D) increae" tre*en"o!ly Correct Answer : Increases by #0 +B Q: A) B) C) D) Correct Answer : Q :A 1M wave is represented by this 1M wave in a resistor will be A)4.8 B) 6.6 C) %.2 D) 8 Correct Answer : /$# W Q :In an 1M si)nal! the power A)increae a *o"!lation in"e: increae B) re"!ce a *o"!lation in"e: increae
*he power dissipated by
C) re*ain contant even $hen *o"!lation in"e: varie. D) 25. Correct Answer : remains constant even when modulation index varies$ Q :1or a 1M wave carrier modulatin) fre?uency is "0 +B and bandwidth is # MB$ If the modulatin) si)nal amplitude is doubled! the bandwidth will be A)0.5 z B) 1 z C) 2 z D) 4 z Correct Answer : ( MB Q :1or a 1M wave carrier modulatin) fre?uency is "0 +B and bandwidth is # MB$ if the modulatin) fre?uency is increased to #0 +B the bandwidth will be A)0.5 z B) 1 z C) 2 z D) 4 z Correct Answer : " MB Q :A 1M si)nal has modulatin) fre?uency f mand maximum fre?uency deviation of L$ *he bandwidth will be nearly A)G B) C) D) Correct Answer : Q :When bandwidth is the maOor consideration a narrow band 1M can be approximated to
A)B B) A C) ' D) 7B Correct Answer : AM Q: A) B) C) D) Correct Answer :
Q :*he ratio! maximum fre?uency deviationFhi)hest modulation fre?uency is called A)*o"!lation in"e: B) re!ency "eviation C) carrier a*plit!"e D) percenta/e o *o"!lation Correct Answer : modulation index Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q :Armstron) 1$M$ transmitter performs fre?uency multiplication in sta)es A)to increae the overall +; ratio B) to re"!ce ban"$i"th C) to in" the "eire" val!e o carrier re!ency a $ell a re!ency "eviation D) or convenience. Correct Answer : to find the desired value of carrier fre?uency as well as fre?uency deviation! Q: A) B) C) D) Correct Answer : Q :Armstron) modulator )enerates A)A.. B) ?.. C) '.. D) 'C Correct Answer : 1$M$ 1$M$
Q :Which one of the followin) is an indirect way of )eneratin) 1$M$& A)Ar*tron/ *o"!lator B) 7aractor "io"e *o"!lator C) eactance ?=@ *o"!lator D) eactance bipolar tranitor *o"!lator. Correct Answer : Armstron) modulator Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q: A) B) C) D) Correct Answer : Q :1oster seeley discriminator uses a A)in/le t!ne" circ!it B) "o!ble t!ne" circ!it $ith pri*ary an" econ"ary t!ne" to the a*e re!ency C) "o!ble t!ne" circ!it $ith pri*ary an" econ"a ry t!ne" to the "ierent re!ency D) "o!ble t!ne" circ!it an" in/le t!ne" t!n e" circ!it Correct Answer : double tuned circuit with primary and secondary tuned to the same fre?uency
Q :In a sin)le tone 1M discriminator is A)'roportional to "eviation B) proportional to c!be o "eviation C) nverely proportional to c!be o "eviation D) proportional to !are o "eviation Correct Answer : proportional to s?uare of deviation Q: A) B) C) D) Correct Answer : Q :Nimiter is not essential in the followin) detector A)?oter,eeley "icri*inator B) balance" lope "etector C) ratio "etector D) lope "etector Correct Answer : ratio detector
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In TV systems, equalising pulses are sent during A horizontal blanking . B vertical blanking . serrations . ! horizontal retrace . Ans"er# $ption A %hich o& the &ollo"ing is not considered as a use&ul quantity in comparing noise per&ormance o& receivers' receivers' A (oise temperature temperature . B (oise )gure . (oise resistance . ! Input noise voltage . Ans"er# $ption ! An *+ signal has modulating &requency f m and maimum &requency deviation o& -. The band"idth "ill be nearly equal to A . B . f m . ! f m . Ans"er# $ption B n a cellular communication system, path loss bet"een transmitter and receiver is due to A scattering &rom building, trees, vehicles and other structure . B reason at /a above and due to re1ections &rom ground only . reason at /a and /b above along "ith re1ections &rom ionosphere only
. ! reasons at /a, /b and /c above along "ith loss due to sur&ace "ave . phenomenon Ans"er# $ption B A pre2emphasis circuit provides etra noise immunity by A converting the phase modulation to &requency modulation . B pre2ampli&ying pre2ampli&ying the "hole audio band . boosting the base &requencies . ! ampli&ying the higher audio . &requencies Ans"er# $ption ! *or attenuation o& high &requencies "e should use A shunt . capacitance B series capacitance . inductance . ! resistance . Ans"er# $ption A 3planation# 4ince 5c &or high &requencies is lo", the high &requencies are shunted to ground and are not transmitted. In *+ signal "ith a modulation inde mf is passed through a &requency tripler. The "ave in the output o& the tripler tripler "ill have a modulation modulation inde o& A mf . B6 . mf mf 76 . ! mf 78 . Ans"er# $ption B
3planation# *requency multiplier increase the deviation, . The number o& noise sources sources in a B9T are A . 6 B . : . ! ; . Ans"er# $ption A 3planation# 4hot noise, partition noise and thermal noise. A ;00 % carrier is amplitude modulated "ith m < 0.=>. The total po"er in A+ is A ;00 % . B >: . % >?? % . ! @>0 % . Ans"er# $ption B 3planation# . (on2coherently detection detection is not possible pos sible &or A 4 . B A4 . *4 . ! both /a and /c
. n radar systems C* stands &or A o"er Ceturn *actor . B ulse Ceturn *actor . ulse Cepetition . *requency ! ulse Cesponse *actor . Ans"er# $ption A telephone echange has 8000 subscribers. I& the number o& calls originating at peak time is :0, 000 in one hour, the calling rate is A 0.8 . B :07 . 8 0.?: . ! 0.: . Ans"er# $ption B As the &requency increases, the absorption o& ground "ave by earthDs sur&ace A decreases . B increas . es remains the same . ! either /a or /c . Ans"er# $ption B 3planation# Because o& this reason ground "aves can be used &or &requencies upto about :@00 kEz only. he velocity o& sound "aves in air A is constant at all a ll temperatures temperatures .
B varies directly as temperature . varies inversely as absolute temperature . ! varies directly as square root o& absolute a bsolute . temperature Ans"er# $ption ! 3planation# F v F
T. T.
!egaussing in a picture tube means A Adding magnetism in mask and mounting &rame . B Cemoving Cemoving residual magnetism in mask, . shield etc... Increasing resistance o& coils to decrease time constant . ! !ecreasing resistance resistance o& coils to increase time constant. . Ans"er# $ption B 3planation# 4ince gauss is a unit o& magnetic 1u, degaussing means removal o& magnetism. 4ome types o& traps used in video I* ampli)er o& colour TV are A shunt traps . B series traps . absorption traps . ! all o& the above . Ans"er# $ption ! A :000 kEz carrier is simultaneously modulated "ith 600 Ez, ?00 Ez and kEz audio sine "aves. %hich o& the &ollo"ing &requency is least likely to be present in the output' A :00 kEz . B . :000
kEz 888. kEz . ! 88?.0 kEz . Ans"er# $ption B 3planation# *requency present present in the sidebands is equal to < f c G f m, f c G f m , f c G 6f m . In standing "ave pattern on a transmission line A voltage and current nodes coincide . B voltage and current antinodes coincide . voltage nodes and current antinodes as "ell as current current nodes and . voltage antinodes coincide ! both /a and /b . Ans"er# $ption 3planation# %hen standing "ave is set up voltage maima and current minima and voltage minima and current current maima I& the band"idth is increased by , the H*+ HA+ /"here H is the ratio o& 4(C o& output to 4(C at input, *+ is &requency modulation and A+ is amplitude modulation is increased by a &actor o& A . B 6 . . ; ! @ . Ans"er# $ption 3planation# !oubling o& &requency increase 4(C in &requency modulation by ;. It has no eect in A+. *requency shi&t keying is used mostly in A telegrap . hy B telephony
. satellite communication . ! radio transmission . Ans"er# $ption A 3planation# *requency shi&t keying /*4 is a system o& &requency modulation used in telegraphy. In a &ascimile reproduction reproduction time to scan one line is ms. I& it has ;J blanking, the visible trace time is A :.8 ms . B .0? ms . >0 ms . ! 0.0? ms . Ans"er# $ption A 3planation# / ms /: 2 0.0; < :.8 ms. A generator is &eeding po"er to a transmission line o& characteristic impedance K0. The line is terminated in impedance KL. 4tanding "aves "ill be set up i& A KL < K0 . B K M K0 . L KL N K0 . ! both /b and . /c Ans"er# $ption ! 3planation# Both the case, i.e., KL N K0 and KL M K0 give rise to standing "aves. Cadio broadcasts are generally A amplitude modulation .
B &requency . modulation both amplitude and &requency modulation . ! neither amplitude nor &requency modulation . Ans"er# $ption B 3planation# *requency modulation gives noise &ree reception and is used &or radio broadcasts. %hich o& the &ollo"ing is taken as re&erence re&erence antenna &or directive gain' A Eal& "ave dipole . B 3lementary doublet . Isotrop . ic ! In)nitesimal dipole . Ans"er# $ption 3planation# Isotropic antenna is one "hich radiates equally in all directions. It is a standard re&erence antenna. ounterpoise is used in coils having A high . resistivity B lo" resistivity . medium resistivity . ! both /b and /c . Ans"er# $ption A 3planation# ounterpoise is a horizontally buried "ire used to provide lo" grounding resistance in high resistivity resistivity soils. %hich o& the &ollo"ing types o& noise assumes greater importance at high &requencies' A
B 4hot noise . Impulse noise . ! Candom noise . Ans"er# $ption A 3planation# At high &requencies time period o& "ave and transit time become comparable In transistor radio receivers the number o& I* ampli)er stages are A : . B . ; . ! @ . Ans"er# $ption B 3planation# T"o T"o I* ampli)er stages are are very commonly commonly used. It is &ound that in a telephone system @0 subscribers initiate calls during a 60 minute interval and the total duration o& all the calls is :00 minutes. The load is A . B 6 erlang . 6.666 erlang . ! 0.666 erlang . Ans"er# $ption 3planation# . I& transmission band"idth is doubled in *+, 4(C is A doubled . B raised &our times
. decreased &our . times ! halved . Ans"er# $ption 3planation# 4(C changes in the ratio o& square o& change in band"idth. !irectivity means A maimum directive gain . B zero directive gain . minimum directive gain . ! none o& the above . Ans"er# $ption A 3planation# !irectivity means maimum directive gain Assertion (A): A balun is an a n C* impedance matching trans&ormer. trans&ormer. Reason (R): 4ometimes a booster ampli)er is used "ith a TV set.
A Both A and C are correct and C is correct eplanation o& A . B Both A and C are correct but C is not correct . eplanation o& A A is correct but C is "rong . ! A is "rong but C is correct . Ans"er# $ption B 3planation# Balun gives a ; # : impedance trans&ormation. In areas "here TV reception is poor, booster is used to strengthen a TV signal. *ields are said to be circularly polarised i& their magnitudes are A equal and they are in phase . B equal but they dier in phase by G 80O . unequal and dier in phase by G 80O .
! unequal but are in phase . Ans"er# $ption B 3planation# +agnitudes should be equal and phase angle G 80O In the output o& a !+ speech encoder, the consecutive pulses pulses are o& opposite polarity during time interval t : M t M M t . This indicates that during this interval A the input to the modulator is essentially constant . B the modulator is going through th rough slope overload . the accumulator is in saturation . ! the speech signal is being sampled at the (yquist rate . Ans"er# $ption A 3planation# In delta modulator, "hen consecutive pulses o& polarity are opposite then signal is constant. Audio ampli)ers need A Bass control . B Treble Treble control control . Both Bass and Treble . control ! 3ither Bass or Treble control . Ans"er# $ption 3planation# Bass means lo" &requency tones and treble means high &requency tones. In a TV, studio the &unction o& vision s"itcher is to A edit television programs . B relay television programs . control zoom lens . ! mi audio and video signals
. Ans"er# $ption A 3planation# Viscon s"itcher has a provision to select any one or o r more o& a large number o& inputs and s"itching then on to outgoing circuits. In a TV, studio the &unction o& vision s"itcher is to A edit television programs . B relay television programs . control zoom lens . ! mi audio and video signals . Ans"er# $ption A 3planation# Viscon s"itcher has a provision to select any one or o r more o& a large number o& inputs and s"itching then on to outgoing circuits. An *+ signal "ith deviation - is passed through mier. Its &requency is reduced )ve &old. The deviation in output o& mier mier is A 0.? . B . >. ! very very high . Ans"er# $ption B 3planation# !eviation is not aected by mier. In a :00J amplitude modulated signal, the po"er in the upper sideband "hen carrier po"er is to be :00 % and modulation system 44B4, is A :00 % . B @@ % . >0 % .
! > . % Ans"er# $ption ! 3planation# +odulation inde < :00J
:
c < :00 %
4kin depth at :000 +Ez in comparison "ith that at >00 +Ez is A . B . . ! :7 . Ans"er# $ption 3planation# 4kin depth decreases as square root increase in &requency. %hen the carrier is unmodulated, a certain transmitter radiates 8 k% "hen the carrier is sinusoidally modulated the transmitter radiates :0.:> k%. k%. The modulation inde "ill be A 0.: . B :0.:> . 0.; . ! 0.> . Ans"er# $ption ! 3planation# . %hich o& the &ollo"ing microphones "orks on the principle o& *aradayDs *aradayDs la"' A arbon
. B ondenser . +oving . coil ! 3lectret . Ans"er# $ption 3planation# In moving coil microphone variations o& sound pressure cause an em& to be induced in the moving coil. !irective !irective gain is A a po"er . ratio B a voltage ratio . a current ratio . ! a distance ratio . Ans"er# $ption A 3planation# !irective !irective gain is the ratio o& po"er density radiated in a particular direction by the antenna to the po"er density that "ould be radiated by isotropic antenna. Linear diode detector utilizes A linear portion o& static characteristics o& diode . B linear portion o& dynamic characteristic o& diode . square la" portion o& dynamic characteristics o& diode . ! recti)cation recti)cation property o& diode . Ans"er# $ption ! 3planation# !etection /also called demodulation is due to recti)cation recti)cation property o& diode. In a TV studios, 1ying spot scanner is a device &or A miing video and audio signals .
B telecasting &eature . )lms live telecast o& outdoor programs . ! telecast o& indoor music programs . Ans"er# $ption B The antenna diameter o& a radar system system is doubled. The maimum range "ill A be . doubled B become &our times . be halved . ! decrease to one &ourth . Ans"er# $ption A 3planation# Cange is proportional to antenna diameter. %hen modulation inde o& an A+ "ave is increased &rom 0.> to :, the transmitted po"er A remains the same . B increases by >J . increases by . 66.6J ! increases by >0J . Ans"er# $ption 3planation#
. %hich one o& the &ollo"ing &o llo"ing is non2resonant antenna' A *olded dipole
. B Broad side array . 3nd )re array . ! Chombic . antenna Ans"er# $ption ! 3planation# Chombic antenna is a non2resonant antenna capable o& operating over 6 to 60 +Ez range.
