PREBOARD IN ELECTRONICS SYSTEMS AND TECHNOLOGY
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/hat /hat is the effec effecti1 ti1ee ra'ia ra'iate te' ' ,o(er ,o(er of of a re,e re,eate aterr (ith 055 (atts transmitter ,o(er o.t,.t: 7 'B fe+ine +oss: 7 'B '.,+e"er an' circ.+ator +oss: an' %5 'B antenna -ain2 A! 4%> / B! 0555 / C! %0< / D! 0<5 /
8!
/hich /hich of of the the fo++o fo++o(in (in- is stan'a stan'ar'i r'i=e' =e' as ,art ,art of GSM ,hase 0@ that can offer theoretica+ 'ata s,ee's of .,to %%6 )its2 A! EDGE B! GPRS C! /AP D! B+.et .etooth
%5!
A &&&&&& &&&&&& is essentia+ essentia++* +* a ce++ site that is mo.nte mo.nte' ' on a f+at)e' tractor$trai+er .se' for emer-enc* ,.r,oses! A! CO/ B! BLL C! CAL3 D! PONY
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/hich /hich of the fo++o(info++o(in- )est 'escri)es 'escri)es a 'i,$me 'i,$meter2 ter2 A! An S/R S/R mete meter r B! A co.nter C! A 1aria 1aria)+e )+e LC LC osci++at osci++ator or (ith (ith metere' metere' fee')ac fee')ac c.rrent D! A fie fie+' +' str stren en-t -th h mete meter r
%0!
/hich /hich is s,ace s,ace 'i1er 'i1ersit sit* * s*ste s*stem2 m2 A! T(o T(o or more more antennas antennas o,eratino,eratin- on on t(o 'iffe 'ifferent rent fre.encies2 B! T(o T(o transmit transmitters ters o,era o,eratintin- at at same fre.encie fre.enciess C! T(o T(o or more more antenn antennas as o,erati o,eratinn- on the the same same fre.enc* D! T(o T(o antennas antennas from from t(o 'iffer 'ifferent ent transm transmitter itterss
%4!
/hat /hat ,art ,art or sectio section n of a T rec recei1 ei1er er that that se,ar se,arate atess the so.n' an' 1i'eo si-na+s2 A! I3 sta-e B! i'eo 'eo am,+ am,+if ifie ier r C! i'eo 'eo 'et 'etec ecto tor r D! B.rst .rst se, se,ar arat ator or
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/hat /hat is the the channe channe++ n.m)er n.m)er of of an 3M 3M statio station n (ith (ith a carrier fre.enc* of 88!6 MH=2 A! 06< B! 069 C! 06> D! 068
%6!
In a tri,+e tri,+e con1er con1ersion sion s.,erhete s.,erhetero'*n ro'*nee recei1e recei1er: r: 'io'e mi"er sta-es are o,erate' A! In the the +in +inea earr rere-io ion n B! In the the non non+i +ine near ar rere-io ion n C! As c+a c+ass ss A am,+ am,+if ifie iers rs D! As c+a c+ass ss B am, am,+i +ifi fier erss
“To commit an error for the first time is a mistae! To commit the same error the ne"t time is a CHOICE!# $DGM %!
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&&&&&& &&&&&&&& && is is a stan'a stan'ar' r' (her (here)* e)* mo)i+e mo)i+e ,hones ,hones can -ain access to s,ecia++* tai+ore' Internet (e)sites! A! B+.etooth B! GPRS C! /AP D! EDGE /hat /hat noise noise is is a trans transien ientt short short$'. $'.rat ration ion 'is 'ist.r t.r)an )ance ce 'istri).te' essentia++* .niform+* o1er the .sef.+ ,ass)an' of a transmission transmission s*stem2 s*stem2 A! 3+ic 3+ice err nois noisee B! Tran Transi sit$ t$ti time me nois noisee C! Shot noise D! Im,. Im,.+s +see nois noisee /hat /hat is the the inser insertio tion n +oss +oss of of conne connecto ctorr t*,e t*,e s,+i s,+ices ces for a sin-+e mo'e o,tica+ fi)er2 A! 5!6% 'B B! 5!78 'B C! 5!4% 'B D! 5!49 ') In the the E.ro E.ro,ea ,ean n stan' stan'ar' ar':: the the a.ria a.ria++ trans transmi mitte tterr ma"im.m ra'iate' ,o(er is &&&&&& of ,ea 1is.a+ transmitter ,o(er! A! %5; B! 45; C! 05; D! 75; /hat /hat is is the the comm common on .,$ .,$co con1 n1er erte terr an' an' 'o(n 'o(n$$ con1erter I3 for micro(a1e comm.nications2 comm.nications2 A! <5 MH= B! 95 MH= C! %05 MH= D! >5 MH= /hat /hat is the the 'ata 'ata +in +in ,rotoc ,rotoco+ o+ that that is .se' .se' in as*nchrono.s transmission for transferrin- fi+es from one com,.ter to another2 A! A mo'em B! ? mo'em C! B mo'em D! C mo'em /hat /hat 'isto 'istorti rtion on is is not not ca.se ca.se' ' )* transm transmiss ission ion +ine +ine characteristics2 A! Phas Phasee 'ist 'istor orti tion on B! P.+s P.+see sha, sha,ee 'ist 'istor orti tion on C! S,ac S,acin in- )ias )ias 'isto 'istort rtio ion n D! Am,+ Am,+it it.' .'ee 'isto 'istort rtio ion n
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05!
In ISDN: (hat is the )asic access B channe+ 'ata rate2 A! 40 ),s B! <7 ),s C! %77 ),s D! %< ),s /hat is the channe+ s,acin- for M3$H3 1oice fre.encies2 A! 0!9 H= B! 655 H= C! 4!6 H= D! 4 H= /hat is the .anti=ation si-na+$to$noise ratio if an 9$ )it PCM co'e is .se'2 A! 75 'B B! 65 'B C! <5 'B D! <6 'B /hat is the emission 'esi-nation of a sin-+e si'e)an' re'.ce' carrier si-na+2 A! H4E B! 4E C! R4E D! B9E /hat is the most common+* .se' interme'iate fre.enc* of ra'ar recei1ers2 A! 75 MH= B! <5 MH= C! >5 MH= D! 45 MH=
D! A4H 06!
/hich of the fo++o(in- is not a )o.n'e' me'i.m2 A! Coa"ia+ +ine B! T(o$(ire +ine C! /a1e-.i'e D! 3ree s,ace
0
/hat is affecte' )* the 'istance )et(een the +istener an' the so.rce of the so.n' )eca.se the intensit* 1aries in1erse+* (ith the s.are of the 'istance2 A! o+.me B! Pitch C! Lo.'ness D! 3re.enc*
0>!
Com,arin- the ca,acities of a DD an' an or'inar* CD: DD is &&&&&& time )i--er than CD! A! %5 B! 05 C! %6 D! 06
09!
Locin- on to a 'efine' tar-et is no(n as A! HominB! ReferencinC! SearchinD! Definin-
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/hat ca.ses the ma"im.m .sa)+e fre.enc* to 1ar*2 A! The tem,erat.re of the ionos,here B! The s,ee' of the (in's in the .,,er atmos,here C! The t*,e of (eather F.st )e+o( the ionos,here D! The amo.nt of ra'iation recei1e' from the s.n
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The in,.t si-na+ of a tra1e++in- (a1e t.)e is intro'.ce' at A! Catho'e B! Ano'e C! Catho'e en' of the he+i" D! Co++ector en' of the he+i"
45!
/hat +imits the sensiti1it* of a recei1er2 A! The ,o(er s.,,+* of the recei1er B! The ,o(er o.t,.t of a transmitter C! The noise f+oor of the recei1er D! The 'istance )et(een the transmitter an' recei1er
00!
/hat 'etermines the a)i+it* of ra'ar to 'etermine the )earin- to a tar-et2 A! S,ee' of +i-ht B! S,ee' of tar-et C! Antenna 'irecti1it* D! 3re.enc* of si-na+
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/hat is the stan'ar' test tone .se' for a.'io meas.rements2 A! %55 H= B! 655 H= C! %555 H= D! 0555 H=
04!
/hat is the minim.m n.m)er of )its re.ire' in a PCM co'e for a ran-e of %5:5552 A! %0 B! 8 C! %7 D! %5
40!
/hat ca.ses ima-e interference2 A! Lo( -ain B! Hi-h I3 C! Poor front$en' se+ecti1it* D! Lo( si-na+$to$noise ratio
44!
/hat fre.enc* )an' is referre' to as the metric (a1es2 A! H3 B! H3 C! H3 D! SH3
07!
The antenna c.rrent is 'o.)+e' (hen the mo'.+ation in'e" is 'o.)+e' in &&&&&& AM s*stem! A! A6C B! A4 C! A4
47!
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A (a1e-.i'e ,assi1e com,onent that )rin-s a smooth chan-e in the 'irection of a"is maintaine' ,er,en'ic.+ar to the ,+ane of ,o+ari=ation2 A! L )en' B! H )en' C! T )en' D! ? )en' Ho( far is the 1is.a+ carrier from the +o(est fre.enc* in the s,ectr.m of a monochrome T )roa'cast channe+ fo++o(in- the NTSC stan'ar'2 A! %!6 MH= B! %!06 MH= C! 7!6 MH= D! 5!06 MH=
4
/hat aircraft 'e1iation is meas.re' )* an ILS +oca+i=er2 A! A+tit.'e B! Gro.n' s,ee' C! ertica+ D! Hori=onta+
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Si, =one is other(ise no(n as A! Em,t* =one B! Sha'o( =one C! N.++ =one D! one of si+ence
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In the American stan'ar': the a.ra+ transmitter ma"im.m ra'iate' ,o(er is &&&&& of ,ea 1is.a+ transmitter ,o(er! A! %5 ; B! 45 ; C! 05 ; D! 75 ;
48!
/hat character si-nifies the start of the test for Bis*nc2 A! ST? B! SOH C! BCC D! ET?
75!
A +o( fre.enc* a.'i)+e ,erio'ic 1ariation in ,itch of so.n' o.t,.t in hi-h fi'e+it* so.n' re,ro'.ction s*stem2 A! 3+.tter B! /o( C! Strin- 1i)ration D! Ra'io so.n'
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/hen can a cor,oration or association incor,orate' .n'er the Phi+i,,ine +a(s an' (ith forei-n in1estors )e -rante' ra'io station +icense2 A! /hen <5; of the ca,ita+ is o(ne' )* 3i+i,ino citi=ens B! /hen 65; of the ca,ita+ is o(ne' )* 3i+i,ino citi=ens
C! /hen the chairman of the )oar' is a 3i+i,ino D! /hen the ,resi'ent of the cor,orationassociation is a 3i+i,ino 70!
&&&&&& is a term in the test +an-.a-e for noise testinin te+e,hone circ.its that means a one$s*++a)+e (or' consistin- of a consonant: a 1o(e+: an' another consonant! A! Lo-atom B! Nosfer C! Ore D! Be+core
74!
/h* are fre.enc* mo'.+ation transmitters more efficient2 A! Beca.se their ,o(er is increase' )* c+ass C am,+ifiers B! Beca.se their ,o(er is increase' )* c+ass A am,+ifiers C! Beca.se their ,o(er is increase' )* c+ass B am,+ifiers D! Beca.se their ,o(er is increase' )* c+ass AB am,+ifiers
77!
A %555/ carrier is am,+it.'e mo'.+ate' to a 'e,th of 96;! Ca+c.+ate the tota+ ,o(er of the mo'.+ate' (a1e2 A! %4<%!06 / B! <95!<0 / C! %706 / D! >%0!6 /
76!
/hich is not an IT sector2 A! IT$/ B! IT$R C! IT$T D! IT$D
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/hat is the ,rocess of cance++in- the effect on interna+ 'e1ice ca,acitance in ra'io transmitters2 A! De-a.ssinB! Ne.tra+i=ation C! Ioni=ation D! Sta)i+i=ation
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/hich of the fo++o(in- is the )asic s*nthesi=er circ.it2 A! 3re.enc* 'i1i'er B! 3re.enc* m.+ti,+ier C! PLL D! Mi"er
79!
/hich one is not an im,ortant characteristic of the ,h*sica+ +a*er2 A! E+ectrica+ B! Lo-ica+ C! Mechanica+ D! A++ of the choices
78!
/hat is the t*,ica+ se,aration )et(een the t(o con'.ctors in a ,ara++e+ (ire +ine2 A! 5!55% to 5!5% m B! 055 to 655 mm C! 5!<46 to %6!07 cm D! 0!6 to 6 in!
65!
In t$carrier s*stem: t4 has a )it rate of A! 6<5!%<5 M),s B! 77!4>< M),s C! 77!>4< M),s D! 6<5!%5< M),s
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In ra'io si-na+ emission 'esi-nation: the fifth s*m)o+ means A! Detai+s of si-na+s B! T*,e of information transmitte' C! Nat.re of m.+ti,+e"inD! Nat.re of si-na+ mo'.+atin- the main carrier
60!
/hat is the channe+ s,acin- for SITOR fre.encies2 A! 655 H= B! %>5 H= C! 455 H= D! 4 H=
64!
/hich of the fo++o(in- is the ne( name of CCITT2 A! IT$T B! IT$R C! IT$S D! IT$D
67!
66!
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/hich of the fo++o(in- fre.encies is norma++* .se' for 'istress an' safet* comm.nications2 A! 7058!6 H= B! 785 H= C! 6%9 H= D! 0%>7!6 H= /hat is the 'ifference )et(een a1ai+a)+e ,o(er an' ,o(er ).'-et2 A! Po(er mar-in B! E"tra ,o(er C! 3a'e mar-in D! S*stem -ain A matche' termination in (hich the e+ectroma-netic ener-* is a)sor)e' )* (ater! A! Ma"im.m ,o(er transfer B! Loa' C! Loa' (ater D! Basin /hat 'o *o. ca++ the e+ectrica+ con'.ction in a ,hotosensiti1e materia+ (hich is not e",ose' to ra'iation2 A! Dar con'.ctance B! P.re con'.ctance C! B+ac o.t D! S.,er con'.ctance
69!
Ho( man* si'e)an's are ,resent in the 4E mo'e2 A! T(o si'e)an's an' a carrier B! One .,,er si'e)an' C! One +o(er si'e)an' D! T(o carriers an' one si'e)an'
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A com,onent that sam,+es the micro(a1e si-na+ tra1e++in- in one 'irection 'o(n to the transmission +ine A! Iso+ator B! Com)iner C! Directiona+ co.,+er D! Atten.ator
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/hat 'oes OMB stan' for2 A! O,tica+ me'ia )oar' B! Or-ani=ation of me'ica+ )io+o-ist C! O,tica+ me'i.m )oar' D! O,tim.m main )oar'
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A test metho' of com,arin- t(o a.'io s*stems )* s(itchin- in,.ts so that the same recor'in- is hear' in ra,i' s.ccession o1er one -i1en s*stem an' then the other! A! B test B! A test C! AB test D! C test
<0!
An' IT$T s,ecification co'e that 'ea+s (ith the te+e,hone circ.its! A! ? series B! T series C! series D! I series
<4!
/hat 'i-ita+ carrier transmits a 'i-ita+ si-na+ at 0>7!%>< M),s2 A! T% B! T4 C! T0 D! T7
<7!
/hat si-na+$to$noise ratio is re.ire' for satisfactor* te+e1ision rece,tion2 A! %5 'B B! 45 'B C! 75 'B D! 05 'B
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Ho( man* te+e,hone channe+s are there in AT 0 +ine2 A! 65 B! 85 C! 94 D! 8<
<
/hat o,tica+ so.rce ra'iates +i-ht .niform+* in a++ 'irections2 A! Isotro,ic so.rce B! Lam)ertian so.rce C! o+ta-e so.rce
D! I'ea+ so.rce <>!
/hat is the s,ectr.m of stereo,honic 3M si-na+2 A! %8 to 49 H= B! 45 to 64 H= C! 68!6 to >7!6 H= D! 99 to %59 MH=
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/hat is the re.ire' .a+it* factor for an SSB fi+ter (ith the fo++o(in- 'ata center fre.enc* % MH=: the 'esire' atten.ation +e1e+ of the .n(ante' si'e)an' 95 'B an' the se,aration )et(een si'e)an's 055 H=2 A! %:065 B! %0:655 C! %06:555 D! 06:555
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D! The front ,ane+ >6!
/hat is the term .se' in te+e,hon* an' te+e-ra,h* for irre-.+ar 'ist.r)in- ra'iation '.e to 1ario.s ca.ses an' in a ,artic.+ar ,ro'.ce' )* arc transmitters ca.sin- a r.shin- so.n' in recei1in- te+e,hones2 A! 3a" tone B! M.sh C! Hiss D! Crossta+
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/hat 'e1ice in a (a1e-.i'e s*stem .se' for sto,,inor 'i1ertin- e+ectroma-netic (a1e as 'esire'2 A! Mechanica+ s(itch B! E+ectric s(itch C! P.sh$).tton s(itch D! /a1e-.i'e s(itch
>>!
/hat is the ma"im.m ,o(er that can )e o)taine' from a micro(a1e t.)e at %5 GH=2 A! 655 / B! %5 / C! 65 / D! 05 /
>9!
/hat 'o *o. ca++ a ca)+e consistin- of t(iste' ,airs of con'.ctors: each se,arate+* ins.+ate'2 A! Microstri, +ine B! Stri, +ine C! K.a' D! Coa"ia+ ca)+e
>8!
/hat mi"er t*,e has the +o(est s,.rio.s si-na+s2 A! Do.)+e$)a+ance' B! Sin-+e$)a+ance' C! S.,er$hetero'*ner D! Hetero'*ner
95!
/hat 'o *o. ca++ the ran'om noise seen on ra'ar 'is,+a* screen2 A! Im,.+se noise B! Atmos,heric noise C! Grass D! ohnson noise
/hat are the e+ectroma-netic ra'iations of (a1e+en-ths +ess than 455 an-stroms2 A! ?$ra*s B! +tra1io+et ra*s C! Infrare' D! Micro(a1es
9%!
/hich of the fo++o(in- antennas recei1es si-na+s e.a++* (e++ from a++ 'irections in a hori=onta+ ,+ane2 A! Het= antenna B! ertica+ Marconi antenna C! Ya-i antenna D! He+ica+ antenna
/hat is no(n as the a+i-nment of the three co+or -.ns to a common ,oint2 A! Confetti B! Di1er-ence C! Con1er-ence D! S*nchroni=ation
90!
/hat is the 'e,artment or'er that -o1erns commercia+ ra'io o,erator2 A! De,artment Or'er No! 6 B! De,artment Or'er No! 04 C! De,artment Or'er No! 99 D! De,artment Or'er No! 77
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The com,.ter (hich initiates information transfer A! Master
/hat 'o *o. ca++ the ref+ection of a ,art of inci'ent +i-ht at the interface of t(o me'ia that ha1e 'ifferent refracti1e in'ices2 A! Sne++Js ref+ection B! 3resne+ ref+ection C! Lam)ertian ref+ection D! H.*-enJs ref+ection /hich conference in the IT$str.ct.re 'oes the te+ecomm.nication stan'ar'i=ation ).rea. re,ort2 A! /or+' te+ecomm.nication stan'ar'i=ation conference B! IT$'e1e+o,ment sector C! Ra'io re-.+ation )oar' D! The secretar* -enera+ /hat re-ion aro.n' a )roa'castin- transmitter in (hich satisfactor* rece,tion of )roa'castin- si-na+ is not o)taine'2 A! 3rin-e area B! Primar* are C! Secon'ar* area D! Tertiar* area
/here is the )ri-htness contro+ +ocate' in a T2 A! The a.'io section B! The 1i'eo section C! The -ri'$catho'e circ.it
B! Station C! S+a1e D! Mainframe 97!
96!
9
9>!
99!
98!
85!
8%!
/hich of the fo++o(in- antennas re.ire -oo' -ro.n'in-2 A! Ya-i antenna B! Hert= antenna C! Marconi antenna D! Isotro,ic antenna /hich circ.it 'etects fre.enc* mo'.+ate' si-na+2 A! Mo'.+ator B! Discriminator C! Demo'.+ator D! Mo'em /hat s*nchroni=ation is ,ro1i'e' so that the start an' en' of messa-e is i'entifie'2 A! Carrier B! Character C! Bit D! C+oc A form of re-enerati1e re,eater for transmittinsi-na+s o1er a +on- ca)+e recei1e' thro.-h a re+a* in a c+earer form! A! Acti1e -enerator B! Acti1e re,eater C! Inter,o+ator D! A.'io -enerator /hat is the minim.m ,ro,a-ation 'e+a* of a -eostationar* sate++ite2 A! 0>9 ms B! 048 ms C! 455 ms D! <55 ms In meas.rin- crossta+ .sin- 'B" .nit the reference ,o(er is A! % m/ B! % / C! % ,/ D! < m/ A s,ot on the s.nJs 1isi)+e s.rface (here the ma-netic f+." +ines con1er-e2 A! S.ns,ot B! 3i+ament C! So+ar s,ot D! Prominence &&&&&& is a s+o( mo1in- +ar-e mass of ,+asma on the s.nJs s.rface! A! 3i+ament B! So+ar f+are C! Prominence D! Proton f+are
80!
&&&&&& is s+o( mo1in- “cor'$+ie# mass of ,+asma across the s.nJs s.rface! A! 3i+ament B! So+ar f+are C! Prominence D! So+ar s,ot
84!
At (hat ,artic.+ar (a1e+en-th is so+ar f+." meas.re'2 A! %5!> mm )an' B! %5!> m )an' C! %5!> cm )an' D! %5!> nm )an'
87!
/hat is the a,,ro"imate intensit* of the ma-netic fie+' at the earthJs s.rface2 A! 40:555 nT B! <0:555 nT C! 40:555 T D! <0:555 T
86!
/hat is the intensit* of the ma-netic fie+' at the earthJs north ,o+e2 A! 40:555 nT B! <0:555 nT C! 40:555 T D! <0:555 T
8
/hat 'o *o. ca++ a sate++ite (ei-hin- +ess than % -2 A! Nanosat B! Picosat C! 3emtosat D! Microsat
8>!
The first creat.re in s,ace (as carrie' )* (hich of the fo++o(in- s,acecrafts in No1em)er 4: %86>2 A! S,.tni % B! S,.tni 4 C! S,.tni 0 D! E",+orer %
89!
The (ire+ess e1o+.tion is achie1e' thro.-h the GSM fami+* of (ire+ess techno+o-* ,+atforms (hich inc+.'e ).t e"ce,t one of the fo++o(in-! /hich one is NOT a mem)er of the GSM fami+*2 A! GSM B! EDGE C! GPRS D! CDMA
88!
/hich of the fo++o(in- is an enhancement of GSM inc+.'in- the GPRS2 A! %G B! 0!6G C! 0G D! 4G
%55! A +o( ,o(er: short ran-e (ire+ess techno+o-* 'esi-ne' to ,ro1i'e a re,+acement for seria+ ca)+es is ca++e' &&&&&&!
A! B! C! D!
/AP GPRS B+.etooth EDG
%! /hat si-nificant e+ement of so.n' refers to its characteristic tona+ .a+it*2 A! Pitch B! Tem,o C! Rh*thm D! Tim)re 0! /hat is the 1e+ocit* of so.n' in (oo'2 A! 6955 ms B! 6555 ms C! 4455 ms D! 4>55 ms 4! /hat is the t*,ica+ +o.'ness +e1e+ of a (atch ticin-2 A! 5 ,hon B! 75 ,hons C! 05 ,hons D! <5 ,hons 7! The t*,ica+ +en-th of the rhom)ic antenna is &&&&! A! 0 to 9 B! %5 to 05 C! % to 4 D! 6 to %5 6! /hat is the carrier fre.enc* of s.,er-ro., %52 A! 0>07 H= B! 046< H= C! 0%59 H= D! 4%55 H=
! The ,ro'.ct of the ra'iate' R3 ,o(er of a transmitter an' the -ain of the antenna s*stem in a -i1en 'irection re+ati1e to an isotro,ic ra'iator is ca++e' &&&&! A! Effecti1e Ra'iate' Po(er ERP B! Effecti1e Isotro,ic Ra'iate' Po(er EIRP C! Ra'iate' Po(er D! Transmit Po(er 9! The ,ro'.ct of antenna in,.t ,o(er an' the antenna ,o(er -ain e",resse' in / is ca++e' &&! A! Effecti1e Ra'iate' Po(er ERP B! Effecti1e Isotro,ic Ra'iate' Po(er EIRP C! Ra'iate' Po(er D! Transmit Po(er 8! /hat sate++ite s*stem ,arameter re,resents the .a+it* of a sate++ite or an earth station recei1er2
A! Gain$to$E.i1a+ent Noise Tem,erat.re Ratio GT e B! Ener-* of Bit$to$Noise Densit* Ratio E )No C! Carrier$to$Noise Densit* Ratio CN o D! Bit ener-* %5! /hat noise is o)ser1a)+e at fre.encies in the ran-e from a)o.t 9 MH= to some(hat %!6 GH=2 A! In'.stria+ noise B! Atmos,heric noise C! S,ace noise D! Shot noise %%! A s,ecia+ horn antenna consistin- of a ,ara)o+ic c*+in'er Foine' to a ,*rami'a+ horn! A! Ho-horn B! Cass$horn C! P*rami'a+ horn D! Conica+ horn %0! Ho( man* te+e-ra,h channe+s are there in the )asic 1oice )an' channe+s2 A! 07 B! 8< C! 79 D! <>0
%4! /hich of the fo++o(in- is o+'est m.+ti,+e"in- scheme2 A! 3re.enc* Di1ision M.+ti,+e"in- 3DM B! Time Di1ision M.+ti,+e"in- TDM C! Co'e Di1ision M.+ti,+e"in- CDM D! S,ace Di1ision M.+ti,+e"in- SDM %7! /hat carrier s*stem m.+ti,+e"es 8< 1oice )an' channe+s into a sin-+e ! /hich of the fo++o(in- is NOT a ,oro.s a)sor)er2 A! Prefa)ricate' ti+es B! P+asters an' s,ra* on materia+s C! Aco.stic )+anets D! Mem)rane a)sor)er
%9! /hat historica+ sate++ite )roa'caste' +i1e the %8<7 O+*m,ic -ames from To*o: a,an for the first time2 A! S*ncom I B! S*ncom III C! S*ncom II D! S*ncom I
0>! /ho (i++ a,,oint the chairman an' 0 mem)ers of the )oar' of E+ectronics En-ineerin-2 A! The Senate Presi'ent B! The Presi'ent C! The S.,reme Co.rt D! The Commission on A,,ointment
%8! In transmission +ine: (hich of the fo++o(in- is the first ste, in the ,roce'.re of .sin- st.) matchin-2 A! Ca+c.+ate st.) s.sce,tance! B! Ca+c.+ate +oa' a'mittance C! Connect st.) to +oa' D! Transform con'.ctance to resistance
09! Ho( man* nominees ,er ,osition of the E+ectronics En-ineerin- Boar' are nominate' )* IECEP to PRC2 A! 4 B! 6 C! 7 D! <
05! /hat t*,e of )a+.n )a+ance'$to$.n)a+ance' is .se' in hi-h fre.enc* a,,+ications2 A! Transformer t*,e )a+.n B! A s,ecia++* confi-.re' coa"ia+ transmission +ine C! A s,ecia++* confi-.re' ,ara++e+$(ire +ine D! A 0 transformer )a+.n
08! Accor'in- to RA 8080: ho( man* 'a*s after the )oar' e"am the res.+ts (i++ )e re+ease'2 A! /ithin 6 'a*s B! /ithin %6 'a*s C! /ithin 05 'a*s D! /ithin 4 'a*s
0%! &&&& is 'efine' as an* ra'iation of ener-* )* means of e+ectroma-netic (a1e! A! Emission B! Ra'iation C! Ra'io D! Broa'castin-
45! Ho( man* remo1a+ e"amination s (i++ )e -i1en to an e"aminee (ho o)tains a ,assin- ratin- in the maForit* of the s.)Fects ).t o)tains a ratin- in the other s.)Fect s )e+o( se1ent* ,ercent >5; ).t not +o(er than si"t* ,ercent <5;2 A! % B! 4 C! 0 D! n+imite'
00! In (hat *ear 'i' Hert= 'isco1er ra'io (a1es2 A! %977 B! %9>4 C! %99> D! %986 04! /hich of the fo++o(in- ,henomena is ,ossi)+e is free s,ace me'i.m2 A! Ref+ection of ra'io (a1e B! Diffraction of ra'io (a1e C! Refraction of ra'io (a1e D! Atten.ation of ra'io (a1e 07! /hat is the reactance ,ro,ert* at the in,.t of a shorte' .arter (a1e+en-th +ine2 A! A ,ara++e+ LC circ.it B! A ,.re in'.cti1e reactance C! A series LC circ.it D! A ,.re ca,aciti1e reactance 06! An ear+* sate++ite o(ne' )* S De,artment of Defense that +aste' on+* for %> 'a*s A! Co.rier B! Echo C! Score D! /estar % 047 C! RA >806 D! RA <978
4%! /hich of the fo++o(in- 'etermines the aco.stic )eha1ior of -ases2 A! Densit* B! Press.re C! Tem,erat.re D! A++ of the choices 40! In (hat me'i.m so.n' tra1e+s the faster2 A! ac..m B! So+i' C! Li.i' D! Gas 44! 3or a +o.'ness +e1e+ )et(een %%5 an' %05 'B: the ma"im.m 'ai+* e",os.re +imit is &&&& min.te s! A! % B! <5 C! 05 D! 76 47! A ,oro.s materia+ is far more efficient at hi-h than +o( fre.enc* a)sor,tion! Ho( to im,ro1e so.n' a)sor,tion at +o(er fre.encies .sin- this a)sor)er2 A! Increase the thicness B! Decrease the thicness C! Mo.nt (ith an' airs,ace )ehin' D! Both A an' C a)o1e 46! /hich of the fo++o(in- 'escri)es a TDM frame2 A! A 065$s frame B! A %06$s frame C! A 655$s frame
D! A <5$s frame 4! /hat is the s,ectr.m ran-e of <55 master-ro.,2 A! <5 Q %59 H= B! 6<7 Q 4597 H= C! 4%0 Q 660 H= D! <5 $0>99 H= 49! /hich fre.enc* re.se metho' is +ess effecti1e )eca.se of 3ara'a*Js effect2 A! D.a+ ,o+ari=ation B! Re'.cin- antenna )eam(i'th C! ona+ rotation D! S,in sta)i+i=ation 48! Three te+e,hone circ.its: each ha1in- an SN ratio of 77 'B: are connecte' in tan'em! /hat is the o1era++ SN ratio2 A! 77 'B B! 48!0 'B C! 7% 'B D! 74!60 'B 75! /hat is the noise factor if the e.i1a+ent noise tem,erat.re is 06 2 A! %!58 B! 5!58 C! 5!4< 'Bm D! 5!4< 7%! A -ro.n' station is o,eratin- to a -eostationar* sate++ite at a 6 an-+e of e+e1ation! Ca+c.+ate the ro.n'$tri, time )et(een -ro.n' station an' sate++ite! A! 0>6 s B! 0>6 ms C! %4>!6 s D! %4>!6 ms 70! Ca+c.+ate the re1er)eration time of a +i1in- room 9 ft hi-h: %4 ft (i'e an' 05 ft +on-! The tota+ a)sor,tion of the ).i+'instr.ct.re insi'e the room is %95!> sa)ines (ith fo.r ,ersons ,resent in the room! A! 5!6 ms B! 5!56 s C! 5!6 s D! 6 ms 74! /hat is the n.m)er of +e1e+s re.ire' in a PCM s*stem (ith SN ratio of 75 'B2 A! <7 B! %09 C! 06< D! 6%0
77! A ra'io comm.nications +in is to )e esta)+ishe' 1ia the ionos,here! The ma"im.m 1irt.a+ hei-ht of the +a*er is %55 m at the mi',oint of the ,ath an' the critica+ fre.enc* is 0 MH=! The 'istance )et(een stations is <55 m! 'etermine the o,tim.m (orin- fre.enc*2 A! % / B! 9>% / C! 5!9>% m/ D! 9>% n/ 7! /hat is the a,,ro"imate sin-+e$ho, ni-httime ran-e of 3 0 +a*er2 A! 4975 m B! 4555 m C! 7%45 m D! 0465 m 79! /hat ionos,heric +a*er has a 'a*time a,,ro"imate critica+ fre.enc* of 9 MH=2 A! 30 +a*er B! 3% +a*er C! E +a*er D! D +a*er 78! Determine the a''itiona+ a)sor,tion sa)ines contri).te' )* %5 ,ersons in a room! A! 7> B! 7!> C! 5!7> D! 7>5 65! A fre.enc* of 4555 H= has ho( man* octa1es a)o1e %555 H=2 A! %!< octa1es B! 0!% octa1es C! % octa1e D! 4 octa1es 6%! The +o.'ness +e1e+ increase' from 75 to 6< ,hons! /hat is the increase in +o.'ness sensation2 A! 4 times B! 7!6 times C! 0 times D! 7 times 60! In the North American TDM s*stem: (hat is the transmission rate in M),s of T4 carrier s*stem2
A! 77!>4< B! 7!%>< 64! /hat is the 'ata rate in M),s of a sin-+e sate++ite trans,on'er consi'erin- an SN of 45 'B2 A! 46!9 B! 4!69 C! 469 D! 4695 67! /hat con'ition occ.r (hen the refracti1e in'e" of the air 'ecreases (ith hei-ht m.ch more ra,i'+* the norma+2 A! Refraction B! S.,errefraction C! S.)refraction D! Diffraction 66! /hat 'o *o. ca++ the increase of tem,erat.re (ith hei-ht2 A! Tem,erat.re in1ersion B! Norma+ in1ersion C! D.ctinD! S.,errefraction 6! /hich of the fo++o(in- (a1e+en-ths (here a)sor,tion of e+ectroma-netic (a1es )ecomes ,ea '.e to 1i)rationa+ resonances in the (ater 1a,or mo+ec.+e2 A! %!46 cm an' %!> mm B! %!6 mm an' 6 mm C! %!46 'm an' %!> cm D! %!6 cm an' 6mm 69! O"*-en mo+ec.+e a)sor,tion ,eas to e+ectroma-netic (a1e are at (hat (a1e+en-ths2 A! %!46 cm an' %!> mm B! 6 mm an' 0!6 mm C! 6 cm an' 0!6 cm D! %!46 mm an' %!> m 68! /hat instr.ment norma++* meas.res the 1irt.a+ hei-ht of ionos,here2 A! Ionoson'e B! A+timeter C! 3ie+' meter D! Ra'ar <5! The an-+e of e+e1ation of the antenna )eam is 05! Ca+c.+ate the transmission$,ath 'istance for an ionos,heric transmission that .ti+i=es a +a*er of 1irt.a+ hei-ht 055 m! se f+at$earth a,,ro"imation! A! 8<< m B! 0%55 m C! %%55 m D! 756 m
<%! If tem,erat.re chan-e is %8C: (hat amo.nt of chan-e to so.n' 1e+ocit* is ,ossi)+e2 A! %%!64 fts B! %%!64 ms C! %8!457 fts D! %8!457 ms <0! In the a)o1e ,ro)+em: (hat is the ne( 1e+ocit* of so.n' ass.min- 'r* air me'i.m2 A! 474 fts B! 4745 ms C! 474 ms D! 470 ms <4! In aco.stics: if the 1o+.me of the room is 055 m 4 then at (hat fre.enc* the coefficient of a)sor,tion is meas.re'2 A! %05 H= B! %05 H= C! %55 H= D! %65 H= <7! /hat is the a,,ro"imate )an'(i'th of an 3M s*stem (ith %5 H= of mo'.+atin- fre.enc* an' a %65 H= of fre.enc* 'e1iation2 A! 455 H= B! 405 H= C! %65 H= D! 055 H= <6! /hich of the fo++o(in- +a*ers of the ionos,here has no effect on s* (a1e ,ro,a-ation '.rin- 'a*time2 A! D B! E C! 3% D! 30 <! Ho( to ma"imi=e the si, 'istance2 A! sin- the sma++est ,ossi)+e ra'iation an-+e an' hi-hest ,ossi)+e fre.enc* B! sin- the sma++est ,ossi)+e ra'iation an-+e an' +o(est ,ossi)+e fre.enc* C! sin- the )i--est ,ossi)+e ra'iation an-+e an' hi-hest ,ossi)+e fre.enc* D! sin- the )i--est ,ossi)+e ra'iation an-+e an' +o(est ,ossi)+e fre.enc* <9! 3or a s,ace (a1e transmission: the ra'io hori=on 'istance of a recei1in- antenna (ith a hei-ht of <7 meters is a,,ro"imate+* A! 9 m B! 40 m C! <7 m D! 06< m
<8! /hat )an'(i'th is nee'e' to s.,,ort a ca,acit* of %09 ),s (hen the si-na+ ,o(er to noise ,o(er ratio in 'eci)e+s is %552 A! %8007 H= B! 4964 H= C! %8077 H= D! 4694 H= >5! /hich of the fo++o(in- s*stems .ses fre.enc* )an' 9>5$ 996 MH= as a transmit )an' of its )ase station2 A! TACS B! NTT C! NMT D! AMPS >%! A transmitte' si-na+ 6 meters in (a1e+en-th is recei1e' )* an antenna coi+ ha1in- a 65$ resistance an' a 5!5% H in'.ctance! /hat is the ca,acitance of the t.ner sh.ntin- the antenna coi+ at this ,oint2 A! 5!>57 f3 B! 5!>57 3 C! 5!>57 n3 D! 5!>57 m3 >0! /hich of the fo++o(in- is the )asic com,onent of a comm.nications sate++ite recei1er2 A! On$)oar' com,.ter B! Ref+ector C! Te+emetr* D! Trans,on'er >4! The re1er)eration time of a %97!0 c.)ic meters )roa'cast st.'io is 5!97 sec! 3in' the a)sor,tion effect of the materia+s .se' in metric sa)ines! A! 46!4 B! %5!8< C! 4>8!9 D! %58!< >7! /hat is the hi-hest fre.enc* that can )e sent strai-ht .,(ar' an' )e ret.rne' to earth2 A! M3 B! G*ro fre.enc* C! Si, fre.enc* D! Critica+ fre.enc* >6! /hat is the most im,ortant s,ecification of +o.'s,eaers an' micro,hones2 A! 3re.enc* res,onse B! Po(er 'ensit* C! 3ie+' Stren-th D! Gain >>! Sate++ite or)its aro.n' the earth are &&&& or)its! A! circ.+ar B! either e++i,tica+ or circ.+ar
C! e++i,tica+ D! circ.+ar on+* >9! Ho( 'oes s,atia+ iso+ation techni.e in sate++ite comm.nications a1oi' interference2 A! se of 'ifferent ,o+arit* antennas B! se of 'ifferent t*,es of antennas C! Em,+o*ment of hi-h+* 'irectiona+ s,ot$)eam antennas D! se of +o( -ain antennas >8! An area on earth co1ere' )* a sate++ite ra'io )eam is ca++e' &&&&! A! SSP B! Re-ion C! foot,rint D! ,rimar* area 95! The American concert ,itch A is e.i1a+ent to (hich if the fo++o(in- fre.encies2 A! 775 H= B! 746 H= C! 0<5 H= D! 066 H= 9%! The internationa+ ,itch A is e.i1a+ent to &&& H=! A! 746 B! 775 C! 0<5 D! 066 90! The s,ee' of the sate++ite increases as its hei-ht in or)it -ets A! +o(er B! hi-her C! c+oser to the moon D! c+oser to the s.n 94! /hat is the effecti1e ra'iate' ,o(er of a re,eater (ith 65 (atts transmitter ,o(er o.t,.t U: 7 'B fee'+ine +oss: 4 'B '.,+e"er an' circ.+ator +oss: an' < 'B antenna -ain2 A! %69 / B! 48!> / C! 06% / D! <8!8 / 97! A ce++.+ar stan'ar' no(n as the c'maOne! A! IS$86 B! IS$%4< C! IS$67 D! IS$%55 96! /hat is the effecti1e ra'iate' ,o(er of a re,eater (ith 65 (atts transmitter ,o(er o.t,.t: 6 'B fee'+ine +oss: 7 'B '.,+e"er an' circ.+ator +oss: an' > 'B antenna -ain2 A! 455 / B! 4%6 / C! 4%!6 / D! <8!8 / 9
B! 05 Base 0 C! %5 Base 6 D! %5 Base % 9>! /hat is the effecti1e ra'iate' ,o(er of a re,eater (ith >6 (atts transmitter ,o(er o.t,.t: 7 'B fee'+ine +oss: 4 'B '.,+e"er an' circ.+ator +oss: an' %5 'B antenna -ain2 A! <55 / B! >6 / C! %9!>6 / D! %65 / 99! /hich of the fo++o(in- re-.+ates the o(nershi, an' o,eration of ra'io an' te+e1ision stations in the co.ntr*2 A! PD 6><$A B! PD >6< C! PD <6> D! PD <>> 98! /hat is the effecti1e ra'iate' ,o(er of a re,eater (ith >6 (atts transmitter ,o(er o.t,.t: 6 'B fee'+ine +oss: 7 'B '.,+e"er an' circ.+ator +oss: an' < 'B antenna -ain2 A! 4>!< / B! 04> / C! %65 / D! 04!> / 85! In GSM ce++.+ar s*stem: the s,eech co'in- rate is &&&&! A! %4 ),s B! 9 ),s C! %6 ),s D! 05 ),s 8%! /hat is the effecti1e ra'iate' ,o(er of a re,eater (ith %55 (atts transmitter ,o(er o.t,.t: 6 'B fee'+ine +oss: 7 'B '.,+e"er an' circ.+ator +oss: an' %5 'B antenna -ain2 A! 955 / B! %0< / C! %0!6 / D! %0<5 / 80! /hich NTC memoran'.m circ.+ar -o1erns the r.+es an' re-.+ations a)o.t the man.fact.re: ac.isition: sa+e an' ser1ice of ra'io comm.nication e.i,ment2 A! MC No! 0$56$99 B! MC No! 0$57$99 C! MC No! 0$5>$99 D! MC No! 0$58$99 84! /hat is the effecti1e ra'iate' ,o(er of a re,eater (ith %05 (atts transmitter ,o(er o.t,.t: 6 'B fee'+ine +oss: 7 'B '.,+e"er an' circ.+ator +oss: an' < 'B antenna -ain2 A! <5% / B! 075 /
C! <5 / D! 4>8 / 87! /hat 'o *o. ca++ a short )it se.ence sent t *,ica++* %09 )its in 'i-ita+ si-nat.res2 A! Hash B! P.)+ic e* C! Pri1ate e* D! Pass(or' 86! /hat me'i.m is .se' )* IBM toen rin- net(or that o,erates at either 7 M),s or %< M),s2 A! T(iste' ,air B! Coa"ia+ ca)+e C! 3i)er$o,tic D! Para++e+$(ire +ine 8! Accor'in- to BP re1ise' ra'io co'e (hich airtime )e+o( is c+assifie' c+ass D for AM stations2 A! <55 AM to %055 NN B! %055 NN to <55 PM C! 855 PM to %0 Mi'ni-ht D! %055 Mi'ni-ht to 655 AM 89! Encr*,tion of 'ata is im,ortant to ens.re its ,ri1ac*! It is most common+* achie1e' )* .sin- a &&&&! A! ,.)+ic$e* encr*,tion B! ,ri1ate$e* encr*,tion C! ,ass(or'$e* encr*,tion D! character set encr*,tion 88! The s,eech co'in- rate in D$AMPS is &&&&! A! 9 ),s B! %4 ),s C! %6 ),s D! 05 ),s %55! /hich of the fo++o(in- ,rinci,a+ m.sica+ inter1a+s is consi'ere' 'issonant2 A! >9 B! %0 C! 69 D! 46 GOD BLESSVVV Pre,are' )* En-r! Den1er G! Ma-ti)a*: ECT