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TRNG I HC CNTT&TT

KHOA CNG NGH T&TT

BI KIM TRA KT THC HC PHNMn: K thut Viba s

Thi gian lm bi: 60 pht***********************

H v tn:Lp hc phn:..

Cu 4 Phng thc iu ch s thng dng trong h thng vi ba s l: A) M- PSK

B) M- QAM a mcC) M- PSK, M- QAM a mc

D) ASK

Cu 5 Tn hiuc truyn trong h thng viba s lA) Tng tB) SC) Tng t, s

D) iu ch sCu 6 M truyn dn thng c dng trong h thng vi ba s l:

A) CMI, HDB3B) AMI, HDB3

C) AMI, CMI

D) HDB3, AMI, CMI

Cu 1 H thng viba sc gi l h thng c dung lng trung bnh, nu:A) B = 10bps 100bps

B) B = 10Mbps100MbpsC) B = 10100MHz

D) B = 10MHz100MHz

Cu 2 Phn loi theo c ly, tuyn ngn trong viba s c cimA) C ly lin lc L< 4kmB) C ly lin lc L < 40kmC) C ly lin lc L < 400km

D) C ly lin lc L < 4000kmCu 3 M c dng biu din di y l thuc loi m no ?

A) M AMI

B) M CMIC) M cc

D) M lng cc

M : 03

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Cu 7 K thut phn tp tn s c cim:A) Mt tn hiu trn hai hay nhiunten vi cng mt tn sB) Pht cc tin ging nhau trong cc khe thi gian khc nhauC) Mt tn hiu c gi i ng thi qua nhiu tn s

D) Trn mtanten, t hai hay nhiu feed - hornCu 8 Anten YAGI hotng di tn:

A) B)

C)

D)

Cu 9 Nhcim ca k thut phn tp tn s:A) i hi di thng rng cho c bn thu v bn phtB) i hi di thng rng cho bn phtC) i hi di thng rng cho bn thu

D) i hi di thng hp cho c bn thu v bn phtCu 10 Tuyn truyn dn viba s c khong cch gia hai anten l 100km, tn s cng tc l

10GHz, tn hao trong khng gian t do lA) 125,5dB

B) 152,5dBC) 332,5dB

D) 323,5dB

Cu 11 Tham s chtlng quan trng nht trong h thng viba tng t l:A) T s tn hiu trn tp mB) BERC) Xc sut li k hiu Pe

D) C 3 phng n trnCu 12 Tn hiu v tuyn gia li vo/ra ca mt trm lp c mc khc bit l

A) 60 dB

B) 80 dB

C) D) Ngoi khong

Cu 13 Trong h thng viba s, tuyn phtthc hin cc chc nng:A) Bini tn hiu bng gc thnh tn hiu dng sng

B) Chuyn i tn hiu ln bng tn cng tc

C) Khuych i tn hiu, hn ch ph tn hiu v bc x qua anten

D) C 3 phng n trnCu 14 Min Fresnel c dng l hnh

A) ElipB) Trn

C) TrD) Cu

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Cu 15 Trong h thng viba s, khong cch truyn khng cn s dng trm lpA) Khng qu 20km

B) Khng qu 20km

C) Khng qu 20km

D) Khng qu 60kmCu 16 Tn hao thit b (ng dn sng) truyn dn sng gia anten v my pht/thu l:

A) Tn hao trong khng gian t doB) Tn hao r nhnhC) Tn hao feeder

D) Tn hao hp th kh quynCu 17 Gi tro b rng chng viba l

A) i Fresnel 1B) Min Fresnel

C) H s bn knh hiu dng

D) Ngng thuCu 18 Kh nng s dng tuyn c biu th bng:

A) Phn trmB) Thi gianC) Dung lng

D) TcCu 19 Thit b MIMILINK E c cim :

A) L thit b viba im im, cho php truyn dn t 2 34Mbit/s.B) Cho php truyn dn t 2 34Mbit/s, cho php truyn dn tin cy.C) Hotng trong gii tn t 7GHz 38GHz.

D) C ba phng n trn.Cu 20 Ga tr ca h s bn knh hiu dng tri t K tnh cho vng n ho theo khuyn

ngh l:A) K= 4/3-3/2

B) K=4/3C) K= 6/5-4/3

D) K= 1

Cu 21 Khi trkhng ra ca my pht v trkhng vo my thu c chun ho 50, th trkhng vo ra ca b lc, ng dn song l

A) 20B) 30C) 40

D) 50Cu 22 Mtng trc chiu di L = 32km, khng s dngng cho php (Pucf) bng:

A) 0,032%B) 0,0032%

C) 0,322%

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D) 32%

Cu 23 nng ca v tr (x) lA) cao ca mt bng xy dng trm so vi mc nc binB) cao ca cc anten so vi mcnc binC) cao ca mt bng xy dng trm so vi mt t

D) cao ca anten dng trm so vi mttCu 24 Tham s th hin kh nng xut hin phading nhiu tia:

A) d tr phading

B) Khong thi gian phading

C) Xc sut phading phng nhiu tiaD) Xc sut phading phng di hn 10giy

Cu 25 Tn hao trong khng gian t do ph thuc vo:A) Tn s sng mang, di tuyn truyn dnB) Tn s sng mang, gc mhiu dng ca anten

C) Tn s sng mang, gc mhiu dng caanten, ng knh ming antenD) Tn s sng mang, bn knh min Fresnel 1

Cu 26 Tham s quytnh xem tuyn c hotng hay khng khi em so snh n vi mcngng thu ca my thu:

A) Cng sut u vo ca my thuB) Tng cc liC) Cng sut pht

D) Tn hao tngCu 27 Khi tnh mc tn hao hp th kh quyn nn theo cc ch tiu c khuyn ngh

A) Nht BnB) Bc M, CanadaC) Chu u

D) C 3 phng n trnCu 28 n v cng sut pht tnh bng

A) W

B) dB

C) dBW

D) dBmCu 29 Viba s bng rng (tc cao) c dng

A) Truyn cc tn hiu c tc t 34 - 75MbpsB) Truyn cc tn hiu c tc t 75 - 140MbpsC) Truyn cc tn hiu c tc t 140 - 280Mbps

D) Truyn cc tn hiu c tc t 34 - 140MbpsCu 30 Thit b viba s RMD 1504 s dng k thut gii iu ch:

A) Kt hpB) Khng kt hpC) Kt hp, khng kt hp

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D) Tch sng ng baoCu 31 Thit b viba s KST 2M98 c bng tn cng tc

A) 684806 MHzB) 1,4271535MHzC) 684806 GHz

D) 1,4271535GHzCu 32 MTTR c ngha:

A) khng kh dng ca thit bB) L thi gian trung bnh gia cc s c tnh bng giC) L thi gian trung bnh khi phc li dch v tnh bng gi

D) L thi gian trung bnh gia cc s c tnh bng giCu 33 H sa hnh C theo khuyn nghc chn cho vng c a hnh trung bnh, kh

hu n i l:A) 1B) 4

C) 0.25

D) 2

Cu 34 Hiu sut ca anten Parobol dung trong viba s c gi trA) B) C)

D)

Cu 35 M CMI c c im g?A) Khng m xung cho trng thi bit 0B)

Khng m xung cho trng thi bit 1C) Ch m xung cho trng thi bit 1D) M xung cho c hai trng thi 0 v 1

Cu 36 Cc h thng viba s c tc bit tng cng u vo c gi l

A) Cc h thng dung lng thpB) Cc h thng dung lng trung bnhC) Cc h thng dung lng cao

D) Cc h thng dung lng thp, trung bnh, caoCu 37 cao tia v tuyn phi tnh n:

A) cao vt chn O gia tuynB) cao ca cy ci T gia tuyn

C) Bn knh min Fresnel 1

D) C 3 phng n trnCu 38 Tn hiuiu ch QAM c cim:

A) Thay i c pha v bin B) Ch thay i v pha

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C) Chthay i v bin D) Thay i v tn s

Cu 39 Tn hao tng l tng caA) Tn hao trong khng gian t do, tn hao phidB) Tn hao phid, tn hao r nhnhC) Tn hao r nhnh, tng hao hp th kh quyn

D) Tn hao trong khng gian t do, tn hao phid, tn hao r nhnh, tng hao hpth kh quyn

Cu 40 Thit b RMD 1504 s dng k thutiu ch:A) OQPSK

B) PSK

C) QPSKD) BPSK

Cu 41 BPSKA) Thit b viba s KST 2M98 s dng m ng truynB) HDB3C) CMI

D) AMI

Cu 42 Tuyn viba s di 28km, hotngtn s 7GHz, bn knh min Fresnel 1 tiimgia tuyn c gi tr

A)

B)

C)

D) Cu 43 Anten Parabol hotngdi tn

A)

B)

C)

D) Cu 44 H thng vi ba s phn loi theo c ly lin lc gm:

A) Tuyn di, tuyn trung.B) Tuyn trung, tuyn ngnC) Tuyn ngn, tuyn di

D) Tuyn di, tuyn trung, tuyn ngn

Cu 45 H thng vi ba s phn loitheo dung lng gm c:A) Cc h thng dung lng thpB) Cc h thng dung lng trung bnhC) Cc h thng dung lng cao

D) Cc h thng dung lng thp, trung bnh, caoCu 46 H thng vi ba s bt u hnh thnh t khi no?

A) Nhng nm 40

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B) Nhng nm 50C) Nhng nm 60

D) Gn yCu 47 Phn b tn s lung cao tn trong vi ba s ph thuc vo:

A) Phng thc iu ch sB) c tnh mi trng truynC) Cch sp xp cc lung cao tn

D) C 3 phng n trnCu 48 tc tin cy cao, thit b hotng khng b nhm li, BER cn c cc c

im:A) Cng cao cng ttB) Cng thp cng ttC) Khng cn quan tm ti gi tr

D) Tu thuc vo h tng thit bCu 49 Mc suy hao ca sng v tuyn t anten pht n anten thu trong khng gian t do

c cim:A) T l nghch vi bnh phng khong cch, t l thun vi dibc sngB) T l nghch vi di bc sng, t l thun vi bnh phng khong cchC) T l nghch vi bnh phng dibc sng, t l thun vi khong cch

D) T l thun vi bnh phng dibc sng, t l thun vi khong cchCu 50 Dung lng tn hiua vo ca thit b viba s RMD 1504 l:

A) 2* 2,048 MbpsB) 4* 2,048 Mbps

C) 6* 2,048 Mbps

D) 8* 2,048 Mbps

Cu 51 Mtng trc chiu di L = 40km, khng s dngng cho php (Pucf) bng:A) 0,004%B) 0,4%

C) 0,04%

D) 4%

Cu 52 i vi tuyn cnh, khi tn s tng ln v anten ln hn, th i Fresnel s:A) Hp hnB) Khng thay iC) Rng hn

D)L hnh trnCu 53 Thit b viba s AMLD16/12 c cng sut pht l

A) 32dB

B) 23dB

C) 28dBmD) 82dBm

Cu 54 Khi tnh tn hao do ma, h s ma to c chn l:

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A) 0,1

B) 0,04

C) 0,01

D) 0,4Cu 55 Sng mang gia cc lung cao tn trong viba s theo khuyn ngh c cim:

A) Nn cch nhau 29MHz 40MHz

B) Phn cc trc giaoC) Nn cch nhau 29MHz 40MHz, Phn cc trc giao

D) Khng cn khong phng vCu 56 Tiu hao do ma tng nhanh tn s s:

A) >35GMHzB) >35MHz

C) >35KHz

D) >35Hz

Cu 57 Tnh Tham s chtlng: xc sut BER vt 10-3 ca tuyn viba s da vo:A) Xc sut Phading nhiu tia(P0), Xc sutt ti gi trngng thu tng ng vi

RXb(Pb)

B) Cc xc sutt ti cc gi trngng thu tng ng vi RXa,RXbC) Xc sut Phading nhiu tia, Xc sut t ti gi tr ngng thu tng ng vi

RXaD) Xc sut Phading nhiu tia, Cc xc sutt ti cc gi trngng thu tng ng vi

RXa,RXb

Cu 58 Tham s quytnh xem tuyn c hotng hay khng khi em so snh n vi mcngng thu ca my thu:

A) Cng sut u vo ca my thuB) Tng cc liC) Cng sut pht

D) Tn hao tngCu 59 Thit b MIMILINK E c tc truyn dn l :

A) 2bps 34Mbps

B) 2kbps 34Mbps

C) 2Mbps 34MbpsD) 20Mbps 34Mbps

Cu 60 D liu tng ng vi tn hiuciu ch s

A) 000110B) 110001

C) 100111

D) 111100

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