Cau Hoi Trac Nghiem HTVT CD Nghe 2010

7/29/2019 Cau Hoi Trac Nghiem HTVT CD Nghe 2010

1/25

CU HI TRC NGHIM N THI TT NGHIPMn: H THNG VIN THNG

H Cao ng Ngh(Lu : Cu hi trc nghim ch mang tnh cht tham kho)

Cu 1: Cu no sau y sai khi khi nim m haa. M ha l vic chuyn i cc phn t ca mt tp i lng ny thnh mt tpi lng khc.

b. M ha nhm mc ch tin li cho vic lu tr v trao i thng tinc. M ho l php bin i cu trc tin ti ni pht nhm mc ch nhn c tin ti

ni thu trung thc hn, c tin cy cao hn, kh nng chng nhiu cao hn.d. M ha nhm mc ch tn hiu thu c khuch i ln hn tn hiu pht

Cu 2: Cc loi m ha trong h thng thng tin bao gma. M ha ngun, m ha knh, m ha ng truynb. M ha ngun, m ha d liu, m ha ng truync. M ha thng tin, m ha tn hiu, m ha ngund. M ha iu ch, m ha khi phc, m ha bo mt

Cu 3: Trong m ha ngun, ta s dng m ha no sau y th hin chui k t vnbn trong h thng my tnh.

a. M ha Winzipb. M ha Textc. M ha ASCIId. M ha Winword

Cu 4: M ha nn d liu no sau y c c im: di t m t l nghch vi xcsut xut hin.

a. Shanon Fanob. Lempel Zipc. Shanon Fano v Lempel Zipd. Tt c u sai

Cu 5: M ha nn d liu no sau y c c im: nn d liu trc tipe. Shanon Fanof. Lempel Zip

g. Shanon Fano v Lempel Ziph. Tt c u sai

Cu 6: M ho knh cho php pht hin li v sa li. N lm tng cht lng tin nhnc, gim t s bit li BER, do tnh cht ny nn ta cn c th gi l m chng nhiu. gim li nhn c ni thu, ngi ta dng mt trong hai k thut chnh sau y:

a. ARQ hoc FEC

b. ACK hoc REP

1


2/25

c. ARQ hoc ACK

d. ACK hoc FRAME

Cu 7: M ho knh cho php pht hin li v sa li. N lm tng cht lng tin nhnc, gim t s bit li BER, do tnh cht ny nn ta cn c th gi l m chng nhiu.Khi pht hin thy li, my thu s yu cu truyn li khi s liu v ARQ thng dngtrong h thng c tnh cht sau

a. Knh truyn song cng

b. Knh truyn n cng

c. Knh truyn bn song cng

d. Knh truyn n cng v song cng

Cu 8: Vic bin i tn hiu sao cho n c dng sng ph hp vi c tnh knh truyn

vt l v thit b thu c gi l m ho ng truyn (line coding ). Trong m lunphin o du AMI (Alternate Mark Inversion) thuc loi m no

a. M unipolar

b. M bipolar

c. M polar

d. M biphase

Cu 9: M B8ZS trong mt chui 8 bit 0 c m ho thnh mt chui khc v c

gi l s vi phm (violation). 8 bit 0 s c m ho thnh 000+-0-+ nu xung in pca bit 1 trc l dng. Ngc li, 8 bit 0 s c m ho thnh 000-+0+- nu xungin p ca bit 1 trc l m. y l m ha theo tiu chun no

a. Chun Vit Nam TCVN-B8ZS

b. Chun Bc M

c. Chun Chu u

d. Chun Nht bn

Cu 10: M HDB3 l m ha ng truyn theo tiu chun noa. Chun Vit Nam TCVN-HDB3

b. Chun Bc M

c. Chun Chu u v Nht bn

d. Chun UTU

Cu 11: M ha HDB3 l loi

2


3/25

a. M ha ngunb. M ha ng truync. M ha knh truynd. M ha bo mt

Cu 12: JPEG l loi m ha ga. M ha ngunb. M ha bo mtc. M ha ngund. M ha ng truyn

Cu 13: Trong cc loi m ha di y loi no l m ha ng truyna. MP3b. JPEGc. Winzipd. RZ

Cu 14 Trong cc loi m ha sau, loi no l m ha nguna. RZb. winzipc. MP3d. c b v c u ng

Cu 15: ng truyn no s dng m HDB3?a. modem cp ng trcb. cp quangc. wifi

d. E1 trn dy in thoi

Cu 16: Mc ch ca m ha knh ?a. Dng lu tr v sa ib. Dng lu tr v bo mtc. Dng chng nhiu trn ng truynd. Dng kim tra li v sa li

Cu 17: Khi nim chung m ha l g ?a. Bin i mt file d liu ny thnh mt file d liu khc lm cho ngi s dng nu

khng phi ch ca file d liu s khng c c thng tin cha trong fileb. Th hin d liu di dng cc h m (VD: DEC,BIN,HEX ..)c. S bin i tn hiu tng t thnh d liu sd. S th hin cc ngun tin thu c bng cc t m cho trong bng m

Cu 18: ng dng ca m ha:a. lu tr v bo mt thng tinb. trao i thng tinc. trao i, lu tr v bo mt thng tin

3


4/25

d. khi phc thng tin

Cu 19: Cho ngun tin: hom nay mua, me khong di cho Nu dng k thut m ha nhphn. Hy tnh chiu di ca t m c s.Kt qu:a. 4bit b. 5bit c. 6bit d. 7bit.

Cu 20: Mc ch ca m ha ngun ?a. Dng lu tr v sa ib. Dng lu tr v bo mtc. Dng chng nhiu trn ng truynd. Dng kim tra li

Cu 21: M ho ting ni l loi :a) M ho ngunb) M ho ng truync) M ho knh truyn

d) M ho bo mt

Cu 22: M ho Sharnon - Fan l loi :a. M ho ngunb. M ho ng truync. M ho knh truynd. M ho bo mt

Cu 23: M ho Winzip l loi :a) M ho ngun

b) M ho ng truync) M ho knh truynd) M ho bo mt

Cu 24: M ho NRZ l loi :a) M ho ngunb) M ho ng truync) M ho knh truynd) M ho bo mt

Cu 25: Mc ch ca m ha ng truyn:a) Dng lu tr v sa ib) Dng lu tr v bo mtc) Dng chng nhiu trn ng truynd) Dng chng nhiu v to ng b xung clock trn ng truyn

Cu 26: M ho AMI l loi :a) M ho ngunb) M ho ng truyn

4


5/25

c) M ho knh truynd) M ho bo mt

Cu 27: u im ca m ho RZ :a) Kh nng trit tiu thnh phn DC trn ng truyn ttb) Kh nng ng b xung Clock trn ng truyn ttc) Kh nng ng b xung Clock trn ng truyn cha ttd) Kh nng chng nhiu tt

Cu 28: u im ca m ho NRZ :a) Kh nng trit tiu thnh phn DC trn ng truyn ttb) Kh nng ng b xung Clock trn ng truyn ttc) Kh nng chng nhiu ttd) Kh nng trit tiu thnh phn DC trn ng truyn tt v chng nhiu tt

Cu 29: u im ca m ho AMI:a) Kh nng trit tiu thnh phn DC trn ng truyn tt

b) Kh nng ng b xung Clock trn ng truyn ttc) Kh nng ng b xung Clock trn ng truyn cha ttd) Cu a & c u ng

Cu 30: u im ca m ho B8ZS:a) Kh nng trit tiu thnh phn DC trn ng truyn ttb) Kh nng ng b xung Clock trn ng truyn ttc) Kh nng chng nhiu ttd) Cu 3 cu trn u ng

Cu 31: M ho MP3 l loi m ho g ?a) M ho ngunb) M ho ng truync) M ho knh truynd) M ho bo mt

Cu 32: So snh u im ca m B8SZ vi NRZa) Kh nng trit tiu thnh phn DC trn ng truyn tt hnb) Kh nng ng b xung Clock trn ng truyn tt hnc) Kh nng chng nhiu tt hn

d) C 3 cu trn u ngCu 33: Cho lung d liu s: 110010. Hy xc nh m ho RZ ca lung s trn.

5


6/25

Cu 34: Cho lung d liu s: 110010

Hy xc nh m ho NRZ ca lung s trn.

Cu 35: Cho lung d liu s: 110010

Hy xc nh m ho AMI ca lung s trn.

6

1 1 0 0 1 0

a)

b)

c)

d)

1 1 0 0 1 0

a)

b)

c)

d)


7/25

Cu 36: Cho lung d liu s: 110010000000010Hy xc nh m ho HDB3 ca lung s trn.

Cu 37: Cho lung d liu s: 110010000000010Hy xc nh m ho B8ZS ca lung s trn.

7

1 1 0 0 1 0

a)

b)

c)

d)

1 1 0 0 1 0

a)

b)

c)

d)

0 0 0 0 0 00 1 0


8/25

Cu 38: Cu no sau y sai khi ni c tnh chung ca mi trng truyn thng

a. D liu truyn gia thit b pht v thit b thu thng qua mi trng truyn, mitrng truyn c 2 loi: hu tuyn hay v tuyn.

b. Phng thc truyn n cng (simplex), bn song cng (half duplex), song cng(duplex).

c. S suy gim cht lng ca tn hiu truyn thng do: Suy yu v dn n mo dng,

b lm tr, b nhiu.d. Mi trng truyn ph thuc vo vic truyn thoi (voice) hay truyn d liu (data)

Cu 39 Cu no sau y sai khi ni cp ng trc

a. Cp ng trc cu to t 2 dy kim loi ng trc, phn cch nhaubng vt liu cch in.

b. Li thng lm bng ng, v ni t thng bng cc di ng haynhm xon li theo chiu di.

c. Tr khng c tnh ca cp ng trc thng c gi tr 75 hay 50

d. Cp truyn tn hiu c tn s ln hn 3 GHz

Cu 40: Tr khng c tnh ca cp ng trc c gi tra. 75 b. 50 c. 120

8

1 1 0 0 1 0

a)

b)

c)

d)

0 0 0 0 0 00 1 0


9/25

d. a, b ng

Cu 41: Cc thng s vt l ca ng truyn: in tr ni, t k sinh, cun k sinh, nh hng n cht lng ca ng truyn d liu nh th no:a) Gy suy haob) Gy si dng tn hiuc) Gy bc x tn hiu v nhiu tn hiud) C ba cu u ng

Cu 43: Cu tr li no sai khi th hin s nh hng ca cc thng s vt l ca ng truyn,in tr ni, t k sinh, cun k sinh, , n cht lng ca ng truyn d liu?

e) Gy s bin i cc thnh phn tn s ca tn hiu b) Gy si dng tn hiuc) Gy bc x tn hiu v nhiu tn hiud) Gy ra s mt phi tr khng ca tn hiu ti hai u ca ng dy

Cu 44: Hiu ng Skin effection l g?a) L hiu ng ch xy ra b mt ca vt th thu sngb) L hiu ng ch xy ra b mt ca vt th pht sngc) L hiu ng dng in tch ch chy b mt ca dy dnd) L hiu ng dng in tch chy u qua tit din ngang ca dy dn

Cu 45: Hiu ng Skin effection xy ra vng tn s:a) Tn s thp b) Tn s trungc) Tn s cao d) Tn s t VHF tr ln

Cu 46: Tc lan truyn sng in t trong khng gian t do c th hin bi cng thc:

a)

=V b) fC = c)

=V d) smc /103 8=

Cu 47: Cu tr li no sai khi ni v mi lin h cc thng s h thng vi khong cch truynsng?

a) Khong cch truyn sng t l thun vi cng sut pht.

b) Khong cch truyn sng t l nghch vi nhy b thu.c) Khong cch truyn sng t l nghch vi h s suy gim ca sng.d) Khong cch truyn sng t l nghch vi tn s sng mang.

Cu 48: khc phc hiu ng Skin effection mt cch hiu qu ta nn lm g?a) Tng tit din ca dy dn.b) Gim tit din ca dy dn.c) Tng din tch b mt ca dy dn bng cch dng cc ng dn sng.d) Tng din tch b mt ca dy dn bng cch dng cp ng trc truyn dn sng.

Cu 49: Xc nh vng tn s sng siu m (VLF)

a) 3-30KHz b) 30-300KHz c) 3-40KHz. d) 3-300KHz.

Cu 50: Xc nh vng tn s sng trung (MF)a) 30-300KHz b) 300KHz-3MHz c) 300KHz-30MHz. d) 30KHz-30MHz.

Cu 51: Xc nh vng tn s cao (HF)a) 3-30MHz b) 300KHz-30MHz c) 3-100MHz. d) 3-300MHz.

Cu 52: Xc nh vng tn s rt cao (VHF)

9


10/25

a) 3-30MHz b) 30-300MHz c) 3-300MHz d) 30-3GHz.

Cu 53: Th no l truyn d liu dy nn:a) Truyn tn hiu ngun vi ton b bng thng ca nb) Truyn nguyn thy ngun d liu s bng cch dch tng bt trn ng truyn

c) Truyn d liu sd) Truyn d liu ngun vi ton b bng thng ca n c ci trn sng mang

Cu 54: Th no l truyn d liu qua sng mang:a) Tn hiu ngun c truyn i bng cch iu ch vi sng mangb) Ngun d liu s c truyn i bng cch iu ch sc) Truyn d liu sd) Truyn nguyn thy ngun d liu s bng cch dch tng bt trn ng truyn

Cu 55: L do ti sao truyn d liu dy nn khng th truyn i vi khong cch xac?a) Do nh hng ca nhiub) Xuy gim bin c) Do nh hng ca cc thng s ng truyn, gy bin dng sng nn b thu khngnhn ng gi tr logicd) Do nh hng ca nhiu ngoi v s suy gim bin trn ng truyn

Cu 56: Ti sao truyn d liu bng cch iu ch vi sng mang c th truyn i trnng truyn vi khong cch xa c ?

a) V tn hiu sau iu ch dng s nn t b xi dng trn ng truynb) V tn hiu sau iu ch dng tng t nn khng b suy gim trn ng truync) V tn hiu sau iu ch dng tng t nn khng b nh hng ca nhiud) V tn hiu sau iu ch dng analog nn t b bin dng trn ng truynCu 57: Truyn d liu song song l:a) Truyn d liu trn hai ng song song vi nhaub) Truyn bng nhiu ng truyn khc nhauc) Truyn cng mt lc trn nhiu ng, mi ng truyn ng vi gi tr ca mt bt

d liu

d) Truyn d liu trn hai ng thu v phtCu 58: Truyn d liu ni tip l:a) Truyn bng nhiu ng truyn ni tip nhaub) Truyn cng mt lc trn nhiu ng, mi ng truyn ng vi gi tr ca mt bt

d liuc) Truyn d liu trn hai ng thu v phtd) Gia ni thu v pht, d liu c truyn trn mt ng truyn duy nht

10


11/25

Cu 59: Truyn d liu ng b l:a) Truyn d liu m gia ni thu v ni pht c cng chung ng xung Clockb) Truyn d liu m gia ni thu v ni pht khng c cng chung xung Clockc) Truyn d liu m gia ni thu v pht khng c cng chung tn s xung Clockd) Truyn d liu m gia ni thu v ni pht c cng tn s xung Clock, nhng mi ni

thu v pht u c ngun pht Clock ring bit

Cu 60: c im ca truyn d liu bt ng b l:a) Gia ni thu v ni pht khng c cng chung ng xung Clockb) Gia ni thu v ni pht c cng chung ng xung Clockc) Gia ni thu v ni pht c cng chung tn s xung Clockd) Gia ni thu v ni pht khng c cng chung ng xung Clock, nhng c cng

mt tn s Clock

Cu 61: Chun RS232 l tiu chun quc t v :a) Truyn d liu Internetb) Truyn d liu ni tip bt ng b dy nn

c) Truyn d liu c iu ch sng mangd) Truyn d liu ni tip ng b dy nn

Cu 62: Truyn d liu theo chun RS232 mt file c kch thc 2MB, tn s Clocktruyn l 4800bps, nh dng khung d liu 1start bit, 2stop bit, 1 parity bit v 8bit data.Hy tnh thi gian truyna)1gi 28 pht b)2 gii 30 pht c)3 gii 16 pht d)12 gii 50 pht

Cu 63: Truyn d liu theo chun RS232 mt file c kch thc 1MB, tn s Clocktruyn l 9600bps, nh dng khung d liu 1start bit, 2stop bit, 1 parity bit v 8bit data.

Hy tnh thi gian truyna)12 pht b)22 pht c)32 pht d)38 pht

Cu 64: Truyn d liu theo chun RS232 mt file c kch thc 2MB, tn s Clocktruyn l 19200bps, nh dng khung d liu 1start bit, 1stop bit, 1 parity bit v 8bit data.Hy tnh thi gian truyna)12 pht b)20 pht c)32 pht d)38 pht

Cu 65: Mt phng my c ni mng truy cp Internet dch v ADSL gm mt mych (sever) v 30 my con. Bit rng tc truy cp ca dch v ADSL trung bnh

10Mbps, tc truy cp trn ng truyn cp mng l 100Mbps. Hy tnh thi gian down load trung bnh mt file d liu c kch thc 2MB t mt my con.a)12s b)22s c)40s d)50s

Cu 66: Mt phng my c ni mng truy cp Internet dch v ADSL gm mt mych (sever) v 20 my con. Bit rng tc truy cp ca dch v ADSL trung bnh10Mbps, tc truy cp trn ng truyn cp mng l 100Mbps. Hy tnh thi gian down load mt file d liu c kch thc 5MB t mt my con.

a)34s b)60s c)84s d)122s

11


12/25

Cu 67: u im ca quay s bng DTMF so vi quay s bng xung?a) c th quay ch ci cb) c th nhn tin SMS cc) gim gi thnh tng id) c th quay tc th tng ch s

Cu 68: u im ca k thut chuyn mch TDM so vi SDS:a) Kt cu gn khi s lng thu bao lnb) Gi thnh r trong khi s lng thu bao lnc) Kh thi v k thut ch to khi s lng thu bao tngd) C 3 cu trn u ng.

Cu 69: Chc nng ca tng i in thoi:a) L ni thc hin vic kt ni v cung cp cc dch v cuc gib) L ni thc hin vic kt ni cc thu bao vi nhauc) L ni cung cp cc tin hiu chung, Ringback tone, Dial tone v Busy tone

d) L ni cm nhn trng thi nhc gc my ca thu bao

Cu 70: c im ng dng ca tng i ni b:a) L ni thc hin vic kt ni v cung cp cc dch v cuc gib) Khng tn chi ph cho cc cuc gi ni bc) Khng tn chi ph cho cc cuc gi ni b v hn ch s lng ng dy trung kd) L ni thc hin tnh cc thu bao

Cu 71: Tn hiu Ringback tone l:a) Tn hiu bo bn

b) Tn hiu mi gi quay sc) Tn hiu bo ang chung cho thu bao gid)Tn hiu bo cho thu bao gi rng ang chung cho thu bao b gi

Cu 72: Tn hiu Busy tone l:a) Tn hiu bo bnb) Tn hiu bo chungc) Tn hiu mi gc quay sd) Tn hiu bo ang chung cho thu bao gi

Cu 73: Tn hiu Dial tone l:a) Tn hiu bo bnb) Tn hiu bo chungc) Tn hiu mi goi quay sd) Tn hiu bo ang chung cho thu bao gi

Cu 74: Trong tng i, khi mch giao tip thu bao c chc nng:a) Cm bin trng thi nhc, gc my v chuyn mch cuc gib) Cm bin trng thi nhc gc my, cp chung v kt ni thu bao vi b chuyn mch

12


13/25

c) Giao tip thu bao vi tng i ngoid) L b giao tip trung gian gia thu bao v trung k

Cu 75: Phn bit chuyn mch gi v chuyn mch mch l:a) Chuyn mch gi, d liu c phn thnh cc gi ri c th truyn i trn cc

tuyn knh truyn khc nhau, cn chuyn mch mch th ngun d liu c truynlin tc trn mt knh truyn c thit lp trc

b) Chuyn mch gi, d liu c phn thnh cc gi ri truyn i trn cc tuynknh truyn khc nhau, cn chuyn mch mch th ngun d liu c truyn lin tctrn cc knh truyn khc nhau c thit lp trc

a) Chuyn mch gi d liu c phn thnh cc gi ri truyn i trn mt knh truyn c thit lp trc, cn chuyn mch mch th ngun d liu c truyn lin tctrn mt knh truyn c thit lp trc

Cu 76: u im ca chuyn mch gi so vi chuyn mch mch l:a) C th m rng s thu bao, trong khi chuyn mch mch b hn ch v s lng

thu bao

b) Cc h thng chuyn mch gi t b nghn mch hn so vi cc h thng chuynmch mch

c) Chuyn mch gi cho tc nhanh hn so vi chuyn mch mchd) C hai cu a v b u ng

Cu 77: u im ca chuyn mch mch so vi chuyn mch gi:a) Cc h thng chuyn mch mch t b nghn mch hn so vi cc h thng chuyn

mch gib) Chuyn mch mch cho tc nhanh hn so vi chuyn mch gic) Chuyn mch mch cho php kt ni thng tin lin tc v thi gian

d) C hai cu c v d u ng

Cu 78: Kt ni Internet thuc loi chuyn mch g?a) chuyn mch gib) chuyn mch mchc) chuyn mch khng giand) chuyn mch mm

Cu 79: Tng i in thoi ngy nay thuc loi tng i g?a) Tng i c

b) Tng i in cc) Tng i in c d) Tng i in t

Cu 80: c im ca h thng thng tin di ng la) Tn hiu thoi c iu ch bng sng Radio, bc x ra anten ri truyn n my c

nh (my m)b) Tn hiu thoi c iu ch bng sng Radio, bc x ra anten ri truyn n tng i

trung tm

13


14/25

c) Tn hiu thoi c iu ch bng sng Radio, bc x ra anten ri truyn n trm thupht sng gn nht

d) Tn hiu thoi c iu ch bng sng Radio, bc x ra anten ri truyn n tng ign nht

Cu 81: Bng thng ca h thng GSM nc taa) 890 915MHz cho up link, 935 960 cho down linkb) 980 915MHz cho up link, 953 960 cho down linkc) 890 915MHz cho down link, 935 960 cho up linkd) 850 920MHz cho up link, 950- 1080 cho down link

Cu 82:Khong cch gia cc sng mang (Carrier frequency) trong mng GSM 900 MHz la) 20KHz b)200KHz c)2MHz d)25MHz

Cu 83: H thng GSM dng k thut iu cha) iu ch s GMSK

b) iu ch s BPSKc) iu ch s BFSKd) iu ch tng t

Cu 84:Mng GSM s dng k thut truy xut d liu no chuyn mch trong tng i:a) K thut TDMAb) K thut CDMAc) K thut chuyn mch gid) C hai cu a) v c) u ng

Cu 85: Ti sao trong h thng GSM vic u ch s tn hiu phi thc hin hai ln haynhiu hn :a) Chng nhiub) Tng h s khuch ic) C a v b u ngd) C a v b u sai

Cu 86: Cht lng thng tin di ng GSM tt hn so vi h thng thng tin Radio v:a>

H thng GSM H thng Radio_S dng k thut iu ch s_Tn s sng mang cao hn nn tc truyn d liu cao hn_Qu trnh thng tin lun c kim trahai chiu m bo thng tin truyn lunchnh xc_C th ung cp thng tin a dch v ;thoi, nhn tin, hnh nh

_S dng k thut iu ch tng t_Tn s sng mang cao hn nn tc truyn d liu cao hn_Qu trnh thng tin lun c kim trahai chiu m bo thng tin truyn lunchnh xc_C th ung cp thng tin a dch v ;thoi, nhn tin, hnh nh

14


15/25

b>H thng GSM H thng Radio

_S dng k thut iu ch s_Tn s sng mang cao hn nn tc truyn d liu cao hn_Qu trnh thng tin lun c kim trahai chiu m bo thng tin truyn lunchnh xc_C th ung cp thng tin a dch v:thoi, nhn tin, hnh nh

_S dng k thut iu ch tng t_Tn s sng mang thp hn nn tc truyn d liu cao hn_Qu trnh thng tin khng c kimtra hai chiu m bo thng tin truynlun chnh xc_C th ung cp thng tin a dch v:thoi, nhn tin, hnh nh

c>H thng GSM H thng Radio

_S dng k thut iu ch s_Tn s sng mang cao hn nn tc truyn d liu cao hn_Qu trnh thng tin lun c kim trahai chiu m bo thng tin truyn lunchnh xc_C th ung cp thng tin a dch v ;thoi, nhn tin, hnh nh

_S dng k thut iu ch tng t_Tn s sng mang thp hn nn tc truyn d liu thp hn_Qu trnh thng tin khng c kimtra hai chiu thng tin truyn khngm bo chnh xc_Khng c kh nng cung cp thng tina dch v ; thoi, nhn tin, hnh nh

Cu 87: Bn knh vng ph sng ca mt trm BTS ti a l:a) 5Km b)10Km b)20m d)20Km

Cu 88: Mng GSM s dng bng tn 890 902MHz cho up link v 935 947MHz chodown link. Hy xc nh s sng mang (carrier frequency) ti a c th c.a) 12 b)125 c)60 d)120

Cu 89: Trong h thng GSM, BTS l:a) Trm thu pht sngb) B iu khin trm nnc) B ng k danh xng thit bd) B ng k tm tr

Cu 90: Trong h thng GSM, BSC l:a) Trm thu pht sngb) B iu khin trm nnc) B ng k danh xng thit bd) B ng k tm tr

Cu 91: Trong h thng GSM, EIR l:a) Trm thu pht sngb) B iu khin trm nn

15


16/25

c) B ng k danh xng thit bd) B ng k tm tr

Cu 92: Trong h thng GSM, HLR l:a) Trm thu pht sngb) B ng k danh xng thit bc) B ng k tm tr thng tin thu baod) B ng k thng tr thng tin thu bao

Cu 93: Trong h thng GSM, VLR l:a) Trm thu pht sngb) B iu khin trm nnc) B ng k tm tr thng tin thu baod) B ng k thng tr thng tin thu bao

Cu 94: Trong h thng GSM, OMC l:a) Trm thu pht sng

b) B iu khin trm nnc) B ng k danh xng thit bd) B phn vn hnh v khai thc h thng

Cu 95: Trong h thng GSM, GETWAY l:a) Trm thu pht sngb) B ng k danh xng thit bc) Cng ni kt gia tng i GSM v cc tng i bn ngoid) B phn vn hnh v khai thc thit b

Cu 96: Trong h thng GSM, HLR c chc nng:a) Lu tr cc thng tin cc nhn ca thu bao, VD : S IMSI, S my, tn khch hnh,a ch, s CMND, tnh trng cc, cc dch v ng k ..

b) Lu tr v tr a l ca thu bao hin ti tin cho vic tnh ccc) Lu tr thng tin v thit b Mobile tin cho vic gim st thit b, chng trm.d) iu hnh cc hot ng ca ton b h thng tng i v cc trm BTS, cn l ni

thc hin cc khai bo ng k dch v cho thu bao.

Cu 97: Trong h thng GSM, VLR c chc nng:a) Lu tr cc thng tin cc nhn ca thu bao, VD : S IMSI, S my, tn khch hnh,

a ch, s CMND, tnh trng cc, cc dch v ng k ..b) Lu tr v tr a l, cc thng tin kt ni ca thu bao hin ti, tin cho vic tnhcc

c) Lu tr thng tin v thit b Mobile tin cho vic gim st thit b, chng trm.d) iu hnh cc hot ng ca ton b h thng tng i v cc trm BTS, cn l ni


Cu 98: Trong h thng GSM, EIR c chc nng:

16


17/25

a) Lu tr cc thng tin cc nhn ca thu bao, VD : S IMSI, S my, tn khch hnh,a ch, s CMND, tnh trng cc, cc dch v ng k ..

b) Lu tr v tr a l ca thu bao hin ti tin cho vic tnh ccc) Lu tr thng tin v thit b Mobile, ch s hu ca mobile tin cho vic gim st

thit b v chng trm.d) iu hnh cc hot ng ca ton b h thng tng i v cc trm BTS, cn l ni


Cu 99: Trong h thng GSM, OMC c chc nng:a) Lu tr cc thng tin cc nhn ca thu bao, VD: S IMSI, S my, tn khch hnh,

a ch, s CMND, tnh trng cc, cc dch v ng ky ..b) Lu tr v tr a l ca thu bao hin ti tin cho vic tnh ccc) Lu tr thng tin v thit b Mobile tin cho vic gim st thit b, chng trm.d) iu hnh cc hot ng ca ton b h thng tng i v cc trm BTS, cn l ni


Cu 100:

Tng i GSM s dng cc k thut ghp knh no:a) Ghp knh SDSb) Ghp knh TDMc) Ghp knh FDMd) C cu b v c u ng

Cu 101: Trong h thng GSM khi thc hin cuc gi, tng i GSM s dng k thutchuyn mch:a) chuyn mch mchb) chuyn mch gi

c) chuyn mch khng giand) C cu a v b u ng

Cu 102: Trong h thng GSM khi thc hin vic gi tn nhn, tng i GSM s dngk thut chuyn mch:a) Chuyn mch mchb) Chuyn mch gic) Chuyn mch khng giand) C cu a v b u ng

Cu 103: Trong h thng GSM mt trm BTS c th c cc dng anten c lp ta) Dng Omnib) Dng Sectorc) Dng yagid) C 2 cu a v b ng

Cu 104: Trong h thng GSM cu trc mng cho cc trm BTS theo dng:a) Phn u theo din tch vng a lb) Phn theo dng t ong

17


18/25

c) Khng theo dng nht nhd) Theo dng Bus

Cu 105:Trong h thng GSM 900 s tn s sng mang ti a c th c l 125, mi sng mang c8 time slot, mi time slot c th phc v c cho mt knh thoi. Vy lm th no m rng dung lng ln vi triu thu bao nh hin nay cc mng Mobile trong nc.a) Tng s lng cc trm BTSb) Dng phng php s dng li tn sc) M rng Bng tn GSMd) Cu a v b ng

Cu 106: Trong h thng GSM 900 lm th no tng dung lng knh thng tin trongvng ph sng ca mt trm BTSa) Tng s lng cc trm BTSb) Dng phng php s dng li tn sc) Tng s tn s sng mang hoc dng phng php nhy tn (Frequency Hoping)

d) Cu a, b v c ng

Cu 107: Trong h thng GSM 900 cc yu t nh hng n qu trnh truyn snga) Hin tng tn x sngb) Hin tng nhiu x sngc) Hin tng Fading sngd) Tt c u ng

Cu 108: Cu no sao y sai khi ni cng ngh GSM s dng bng tn

a. Bng tn 900 MHzb. Bng tn 1800 MHz

c. Bng tn 1900 MHz

d. Ch gm bng tn 900 MHz v 1800 MHz

Cu 109: GSM l h thng thng tin di ng c vit tt

a. Gtel System for Mobile

b. Global System for Mobile communication

c. Global System for Mobiled. Genereation Mobile Station

Cu 110: MS l Mobile Station v c xem l

a. MS = ME + IMEI

b. MS = ME + SIM

18


19/25

c. MS = ME + My in thoi

d. MS = MI + SIM

Cu 111 : SIM c vit tt bi

a. System International Mobile

b. Subcriber Identity Mobile

c. Subscriber Identity Module

d. Subscriber Intel Mobile

Cu 112 : Cu no sau y sai khi n chc nng SIM:

a. Lu gi kho nhn thc thu bao cng vi s nhn dng trm di ng quc t IMSInhm thc hin cc th tc nhn thc

b.Lu gi kho nhn thc thu bao cng vi s nhn dng trm di ng quc t IMSInhm thc hin mt m ho thng tin.

d. Trao i thng tin vi MS qua giao din v tuyn

c. Khai thc v qun l s nhn dng c nhn PIN (Personal Identity Number)

Cu 113: M PIN l m Personal Identity Number , bo v quyn s dng ca ngis hu hp php v c np bi nh khai thc khi ng k ln u. PIN l mt s gmt

a. 4 n 8 ch s

b. 1 n 8 ch s

c. 3 bit nh phn

d. ty theo nh cung cp dch v

Cu 114: Cu no sai khi ni chc nng ca BSC

a. iu khin chuyn giao

b. Qun l mng v tuyn

c. Qun l trm v tuyn gc BTS

d. iu khin ni thng cc cuc gi

Cu 115 H thng GSM dng k thut iu ch g?a. iu ch s GMSK b. iu ch s BPSKc. iu ch s BFSK d. iu ch s GSMK Cu 116 H thng GSM dng k thut iu ch g?

19


20/25

a. iu ch s GMSCb. iu ch s BPSKc. iu ch s GMSK d. iu ch s GSMK

Cu 117: Cu no sai khi ni chc nng ca MS

a. Thit b u cui thc hin cc chc nng khng lin quan n mng GSM.b. L thit b m qu trnh m ho v gii m ting c th ring cho GSM c tin

hnh, ti y cng thc hin thch ng tc trong trng hp truyn s liu.

c. B thch ng u cui lm vic nh mt ca ni thng thit b u cui vi kt cui di

ng.

d. Kt cui trm di ng thc hin cc chc nng lin quan n truyn n giao din v

tuyn.

Cu 118: Khong cch gia cc sng mang (Carrier frequency) trong mng GSM 900MHz la. 20KHzb. 200KHzc. 200MHzd. 45MHz

Cu 119: Cu tr li no sai khi m t c im ca h thng thng tin viba-v tinh?a) Tn sng mang ca h thng t 1GHz tr lnb) Anten viba c hng tnh thp nn vng ph sng hpc) H thng truyn dn viba c thit k theo tm nhn thngd) Tn hiu ng vo c iu ch 2 ln hay nhiu hn trc khi pht ra anten

Cu 120: Cu tr li no sai khi m t c im ca h thng thng tin viba-v tinh?a) Tn sng mang ca h thng t 100MHz tr lnb) Anten viba c hng tnh cao nn vng ph sng hpc) H thng truyn dn viba c thit k theo tm nhn thngd) Tn hiu ng vo c iu ch 2 ln hay nhiu hn trc khi pht ra anten

Cu 121: Cu tr li no sai khi m t c im ca h thng thng tin viba-v tinh?a) Tn sng mang ca h thng t 1GHz tr lnb) Anten viba c hng tnh cao nn vng ph sng hpc) H thng truyn dn viba s dng cc anten: dipole, yagid) Tn hiu ng vo c iu ch 2 ln hay nhiu hn trc khi pht ra anten

Cu 122: Cu tr li no sai khi m t c im ca h thng thng tin viba-v tinh?a) Tn sng mang ca h thng t 1GHz tr lnb) Anten viba c hng tnh cao nn vng ph sng hp

20


21/25

c) H thng truyn dn viba c thit k theo tm nhn thng, khong cch ti a vitrm mt

d) Tn hiu ng vo c iu ch 2 ln hay nhiu hn trc khi pht ra anten

Cu 123: Cu tr li no sai khi m t ng dng ca h thng thng tin viba-v tinh?a) Dng thit lp cc tuyn truyn dn hu tuyn thay th cp quang trong iu kin

kh khn v a hnh.

b) H thng thng tin v tinh cho php thng tin din rng, trong mi a hnh t vngni n hi oc) H thng truyn dn viba c s dng trong mng in thoi c nh to ng

lin kt trung k gia tng i v cc thu bao.d) H thng truyn dn viba c s dng trong mng in thoi di ng to ng

lin kt truyn s liu gia cc trm BTS v tng i.

Cu 124: Cu tr li no sai khi m t ng dng ca h thng thng tin viba-v tinh?a) Dng thit lp cc tuyn truyn dn hu tuyn thay th cp quang trong iu kin

kh khn v a hnh.

b) H thng thng tin v tinh cho php thng tin din rng, trong mi a hnh t vngni n hi oc) H thng truyn dn viba c s dng trong mng in thoi c nh to ng

lin kt trung k gia cc tng i.d) H thng truyn dn viba c s dng trong mng in thoi di ng to ng

lin kt truyn s liu gia my mobile v cc trm BTS.

Cu 125: Cu tr li no sai khi m t c im truyn dn ca h thng thng tin viba-v tinh?a) Cc tuyn truyn dn dng sng v tuyn, bng tn Microwaveb) Cht lng ca ng truyn b nh hng rt nhiu bi a hnh, thi tit v mi

trng khng gian, nh: khi, bi, my,

c) Tuyn truyn dn vi ba c thit k theo tm nhn thng.d) Tn s sng mang cng cao th cng sut pht cng gim.

Cu 126: Cu tr li no sai khi m t s ph ca h s suy gim sng theo cc thng s hthng?a) H s suy gim tng khi khong cch truyn tngb) H s suy gim tng khi cng sut bc x tngc) H s suy gim tng khi tn s sng bc x tngd) H s suy gim tng khi nng vt cht ca mi trng truyn tng.

Cu 127 : Cu tr li no sai khi m t hin tng fading sng?a) L hin tng sng c bin lc to, lc nhb) L hin tng sng thu c do tng hp cc thnh sng phn x, nhiu x t cc vt th chnsng n my thuc) L hin tng sng b nhiu.d) Hin tng ny thng xy ra trong mi trng truyn c a hnh g gh.

Cu 128: Ba bc sng s dng ph bin trong thng tin cp si quang l:a. 850, 1300, 1550 m.b. 850, 1300, 1550 nm.c. 850, 1300, 1550 pm.

21


22/25

d. 850, 1300, 1550 mm.

Cu 129: Si quang n mode c ng knh lia. 125 m.b. 60,2 mc. 10 m.d. 62,5 m.

Cu 130: Si quang a mode c ng knh lia. 125 m.b. 50 mc. 10,5 m.d. 62,5 m.

Cu 131: Si quang n mode c ng knh lp v bca. 125 m.b. 60,2 m

c. 10,5 m.d. 62,5 m.

Cu 132: Si quang no c bng thng ln hna. Si n modeb. Si a modec. Si n mode v a mode c bng thng nh nhaud. Khng xc nh c

Cu 133: Bin i in quang E/O din ra ti u no ca h thng truyn dn quang

a. Ti u phtb. Ti u thuc. C hai u ngd. C hai u sai

Cu 134: Cu no sai khi ni u im si quang :

a. Bng thng rng

b. Khng chu nh hng ca nhiu in t

c. t thay i c tnh theo nhit

d. Ghp cc knh quang d dng

Cu 135: Cu no sai, khi ni nguyn nhn suy hao si quang

a. Suy hao do hp th

b. Suy hao do tn x

c. Suy hao do un cong

22


23/25

d. Suy hao do nhit mi trng

Cu 136: Trong h thng truyn dn s dng cp quang truyn, tc c thng tin phthuc voa. Tc chuyn i in quangb. Knh truyn

c. D liu truynd. Khong cch truyn

Cu 137: Trong thit b thu pht quang. Cc b chuyn i quang in thng thng l

a. LED, diode Laser

b. Photodiode PIN, photodiode thc l APD

c. Transistor quang

d. Tt c u sai

Cu 138: ISDN s dng tng i no sau y trong mng in thoia) tng i ni htb) tng i ni bc) tng i hostd) tng i in t s

Cu 139: Cu hnh no khng c BRI cung cpa) Bb) B+Dc) 2B+D

d) D

Cu 140: Mc ch ca knh E trong giao din BRI (ITU-T Rec.I.430) l g?a) Bo dng knhb) Phn gii tranh chp s dng knh Dc) Bo hiu iu khin cuc gid) ng b khung truyn dn lp vt l.

Cu 141: u l nhc im ca cng ngh ISDNa) tr tn hiu ln

b) lm qu ti chuyn mch knhc) truyn d liu i xngd) tc thp nht trong cc loi truy xut s liu

Cu 142: ISDN c c quan no tiu chun haa) TCVNb) ITU-Tc) ISOd) IEEE

23


24/25

Cau 143 : Bandwidth la g?a) o chenh lech gia tan so thap nhat va cao nhat

c truyenb) n v bien dang thong tinc) toc o truyen cua kenhd) ca 3 cau tren eu sai

Cau 144 : Trong mang LAN mot may tnh hong se dan enieu g ?a) mang ngng hoat ongb) ch anh hng nhng g lien quan en may tnh oc) mang ngng hoat ong hoac ch lien quan en may tnho, phu thuoc vao cau truc mang.d) Ca 3 cau tren eu sai

Cau 145: giao thc TCP la giao thc :a) Co nh hng ket noib) Hoat ong lp 4 trong mo hnh OSI.c) Khong nh hng ket noid) Hoat ong lp 3 trong mo hnh OSI.

Cau 146: oi thu canh tranh ln nhat cua ADSL:a) Cable modem.b) Power Line Communication.c) ISDN.d) Direct Broadcast Satellite.

Cu 147: Trong cu trc a ch IP ca lp A , ngi ta chia a ch mng netid gma. 1 Byteb. 2 Bytec. 1 Bitd. 2 Bit

Cu 148: Trong bng cc a ch IP, dy a ch t 240.0.0.0.0 n 247.255.255.255 thuclp no

a. Lp B

b. Lp Cc. Lp Dd. Lp E

Cu 149: Knh B thc hin cc dch v ISDN qua mng v truyn tin tc (thoi v phithoi) gia cc ngi dng v hot ng ti tc

a. 56 Kbps

24


25/25

b. 64 Kbps

c. 16 Kbps

d. 16Kbps vi knh BRI v 64Kbps vi knh PRI.

Cu 150: Knh D trong mng ISDN hot ng ti tc

a. 56 Kbps

b. 64 Kbps

c. 16 Kbps

d. 16Kbps vi knh BRI v 64Kbps vi knh PRI.

Cau Hoi Trac Nghiem HTVT CD Nghe 2010

Documents