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TRC NGHIM CUI K K THUT O IN T
Cu 1 : Trong cc i lng sau y i lng no l i lng in tc ng l :
A . V , I , PB. V , I ,R
C . I , R, CD. P ,R, C .
Cu 2 : i lng in no sau y khng phi l i lng in tc ng :
A . VB. I
C. P D.R
Cu 3 : Trong cc i lng sau y i lng no l i lng in th ng l :
A . V , I , PB. V , I ,R
C . I , R, CD. R , L , C.
Cu 4 : Cc th t c sp xp no sau y ng vi qui nh ca cp chun ha trong o lng :
A . chun quc t , chun khu vc , chun quc gia , chun phng th nghim.
B . chun quc t , chun quc gia, chun khu vc , chun phng th nghim .
C . chun quc gia , chun quc t , chun khu vc , chun phng th nghim/
D . chun quc t , chun khu vc , chun phng th nghim , chun quc gia.
Cu 5 : c tnh tnh ca o lng bao gm cc loi no sau y :
A . chnh xc , phn gii , nhy , tnh tr , sai s ng.
B . chnh xc , phn gii , nhy , tuyn tnh ,tm ng vo ra.
C . chnh xc , phn gii , nhy , tnh tr .
D . Tc phn ng , tnh tr . sai s ng .
Cu 6 : c tnh ng ca o lng bao gm cc loi no sau y :
A . chnh xc , phn gii , nhy , tnh tr , sai s ng.
B . chnh xc , phn gii , nhy , tuyn tnh ,tm ng vo ra.
C . chnh xc , phn gii , nhy , tnh tr .
D . Tc phn ng , tnh tr . sai s ng .
Cu 7 : in p hai u in tr c tr s tin cy c l 50V . Dng vn k o c 49V. Sai s tuyt i l :
A . 1VB . -1V
C . 2VD. -2V
Cu 8 : in p hai u in tr c tr s tin cy c l 50V . Dng vn k o c 49V. Sai s tng i ca thit b l :
A . 1%B. 2%
C . 3%D. 4%
Cu 9 : in p hai u in tr c tr s tin cy c l 50V . Dng vn k o c 49V. chnh xc ca thit b o l :
A . 1%B. 2%
C . 98%D. 3%
Cu 10 : cho vn k c sai s tm o +5% tm o 100V . Gii hn sai s dng cho o in p 50V l :
A . 10%B. 20%
C . 30%D. 40%
Cu 11 : Trong qu trnh thc hin th nghim i vi cc thit b o , ngi s dng thit b o c sai , ghi nhm kt qu . thuc loi sai s no sau y :
A . sai s ch quanB. sai s h thng
C . sai s thit b oD. sai s ngu nhin.
Cu 12 : Sai s no sau y ph thuc thit bi o v nh hng mi trng bn ngoi :
A . sai s ch quanB. sai s h thng
C . sai s thit b oD. sai s ngu nhin.
Cu 13 : cc phn t thit b o c sai s do cng ngh ch to , s lo ha do s dng l :
A . sai s ch quanB. sai s h thng
C . sai s thit b oD. sai s ngu nhin
Cu 14 : Ga s in p c o bng mt vn k c cch khong 1 pht . mc d vn k hot ng bnh thng trong mi trng khng thay i, th tr s c ca vn k vn thay i cht t l do :
A . sai s ch quanB. sai s h thng
C . sai s thit b oD. sai s ngu nhin
Cu 15 : Vn k c sai s tm o tm o 300V. Gii hn sai s dng o in p 120V l :
A . 1% B.5%
C .10%D. 20%
Cu 16 : Vn k -Ampe-k c dng o cng sut tiu th ca in tr . c hai thit b ny u c sai s tm o 1% . Nu vn k c c tm o 150V c ch th 80V v ampe k c c tm o 100mA l 80Ma . Gii hn sai s tm o 80V l :
A . 1,5%B.1,86%
C . 1,7%D.2%
CU 17 : Vn k -Ampe-k c dng o cng sut tiu th ca in tr . c hai thit b ny u c sai s tm o 1% . Nu vn k c c tm o 150V c ch th 80V v ampe k c c tm o 100mA l 80Ma . Gii hn sai s ca cng sut o c
A . 3,29%B. 2.5%
C . 4,5%D. 6,34%
Cu 18 : Khi khng c l xo , cun dy trong c cu t in hot ng nh th no :
A . ng yn khng hot ngB. hot ng bnh thng
C . chy sau dng liD. kt hp chy v dng
Cu 19 : Trong c cu o t in , gc quay kim ch th t l vi :
A . tuyn tnh cng dng inB. tuyn tnh vi in p
C . bnh phng cng dng inD. bnh phng in p
Cu 20 : Trong c cu o in t , gc quay kim ch th t l cng dng in i vo khung quay . gi tr cng dng in l :
A . tr trung bnh
B . tr hiu dng
C . tr nh mc
D . dng in cc i
Cu 21 : Trong c cu o in t , gc quay kim ch th t l vi :
A . tuyn tnh cng dng inB. tuyn tnh vi in p
C . bnh phng cng dng inD. bnh phng in p
Cu 22 : S khc nhau trong nguyn l hot ng ca ng h ch th s v ch th kim l:
A . nguyn l in pB. nguyn l hin th kt qu
C . nguyn l dng inD. nguyn l o in tr
Cu 23 : u im no sau y khng phi ca c cu o t in :
A . chnh xc cao B. thang o c gc tuyn tnh
C . chu qu ti dng ttD. cng sut tiu th nh
Cu 24 : Trong cc c cu sau , c cu no c th o c dng in mt chiu :
A . c cu t inB. c cu in t
C . c cu in ng D. tt c 4 c cu trn
Cu 25: Trong cc c cu sau , c cu no c th o c dng in xoay chieu :
A . c cu t inB. c cu in t
C . c cu in ng D. c B & C.
Cu 26 : i vi c cu t in , khi dng in ng vo tng 2 ln th gc quay:
A . tng 2 lnB. gim 2 ln
C . tng 4 lnD. gim 4 ln
Cu 27 : m rng tm o dng DC trong c cu t in th cn phi :
A . Mc song song vi in tr shunt vi c cu o .
B . Thay i s vng dy ca cun dy .
C . Mc hn hp in tr shunt vi c cu o.
D . Mc ni tip vi in tr shunt vi c o
Cu 28 : m rng tm o dng DC trong c cu in t th cn phi :
A . Mc song song vi in tr shunt vi c cu o .
B . Thay i s vng dy ca cun dy .
C . Mc hn hp in tr shunt vi c cu o.
D . Mc ni tip vi in tr shunt vi c o
Cu 29 : Cho ampe-k DC kiu c cu t in nh hnh .
Vi Rm=1k , Imax = 50 , tm o 1mA th in tr shunt Rs c gi tr l :
A . 52,6 ohmB. 32,6 ohm
C . 23,57 ohmD. 34,49 ohm.
Cu 30: Mt ampe-k DC kiu c cu o t in c 3 in tr mc theo kiu shunt anyton . trong Imax ca c cu 50A , Rm =1k .Trong R1= 0,526 ohm ; R2 =4,737 ohm ; R3 =47,337 ohm.
Vy gi tr tm o ti B l :
A . 1 mA B. 10 ma
C .100maD.50ma
Cu 31 : Mt ampe-k kiu c cu o t in theo kiu shunt anyton . Trong Rm=1k ; Imax ca c cu 50A . cho 3 tm o : 1ma ; 10ma ; 100ma . Xc nh gi tr tm o l :
A . R1 = 0,526 ohm , R2 =4,737 ohm ; R3 = 47,337 ohm
B . R1 = 0,526 ohm , R2 =4,737 OHM ; R3 = 25,678 ohm
C . R1 = 0,526 ohm ; R2 = 47,337 ohm ; R3 =4,737 ohm
D. R1 = 47,337 ohm ; R2 =4,737 ohm; R3 = 25,678 ohm
Cu 32 : Cho c cu t in nh hnh v .
Cho ba tm o : 2,5V ; 10V ; 50V . Cho vn k dng c cu t in Imax =100A ; Rm =0,5k. Ga tr in tr 3 tm o tng ng l .
A . 24,5k ; 0,25k ; 35kB. 75k ; 24,5k; 0,5k
C . 24,5k ; 75k; 400kD. 75k ; 0,5k; 400k
Cu 33 : Cho ba in tr tm o tng ng l R1 =24,5k ; R2=75k; R3=400k l V1= 2,5V ; V2= 10V ; V3=50V . vn k dng c cu t in Imax = 100A ; Rm =0,5k.
Xc nh nhy ca vn k c gi tr l :
A . 10k/Vdc
B . 20k/Vdc
C . 30k/Vdc
D . 40k/Vdc
Cu 34 : Vn k dng c cu in t c cun dy c nh c dng Imax =50 ma tm o 0-300V . in tr ni Rm = 100 ohm . Cng sut ca in tr c gi tr :
A . 14,75 wB. 16,76W
C . 22,3 WD. 5,65W
Cu 35 : Cho s c cu in t nh hnh :
Rm = 1k ; Imax = 50A ; Xc nh gi tr R1 tm o Vac = 10V (RMS) vi Vd = 0,6(RMS).
A . 85kB. 100k
C . 120kD. 150k
Cu 36 : Cho s c cu in t nh hnh :
Rm = 1k ; Imax = 50A ; tm o Vac = 10V (RMS) vi Vd = 0,6(RMS).
Xc nh nhy ca vn k trong trng hp :
A . 9k.
B . 10k
C . 20k
D .30k
Cu 37 : cho s nh hnh v
Bit V =10V ; R2 =R1 =10k . Ga tr in p o c khi s dng vn-k c ni tr Rv = 200 k l :
A . 4,88VB.5V
C .5,55VD. 6,5V
Cu 38 : cho s nh hnh v
Bit V =10V ; R2 =R1 =10k . Ga tr in p o c khi s dng vn-k c ni tr Rv = 200 k l 4,88V . Sai s do nh hng ca vn k l :
A . 2,4%B. 3,2%
C . 4,8%D. 5,3%
Cu 39: Cho vn-k in t o p DC c h s khuch i =1 nh hnh v:
Cho cc tm o : 1V ; 10V ; 50V ; 100V . Dng in chy qua c cu Imax = 100 ; Rm =1k . gi tr in tr ca tm o R1 l :
A . 900k
B . 10k
C . 80k
D . 50k
Cu 40 : Cho vn-k in t o p DC nh hnh v :
Cho cc tm o : 1V ; 10V ; 50V ; 100V . Dng in chy qua c cu Imax = 100 ; Rm =1k . gi tr in p V0 l :
A . 1V
B . 10V
C . 50V
D . 100V
Cu 41 : Cho vn-k in t o p DC nh hnh v :
Cho Vi = 0,1V ; R1 = 90k ; R2 = 10k ; Rm =1k ; Imax = 50A .
Xc nh Rs Im qua ng h ch cc i :
A . 10kB. 19k
C . 20kD. 18k
Cu 42 : Cho vn-k in t o p DC nh hnh v :
Cho Vi = 0,1V ; R1 = 90k ; R2 = 10k ; Rm =1k ; Imax = 50A .
Xc nh gi tr in p Vo ca vn k l :
A . 1V B. 2V
C . 3VD. 4V
Cu 43: Cho vn k o in p DC dng omp IC nh hnh v :
Cho Vi = 0,1V , Imax = 50A ; Rm =1k . Xc nh gi tr R1 l :
A . 1 kB. 2k
C . 3kD. 4k
Cu 44 : Cho vn k o in p DC dng omp IC nh hnh v :
Cho Vi = 0,1V , Imax = 50A ; Rm =1k , Rs = 2k . Ga tr in p Vo l :
A . 250V B .500V
C . 100VD. 300V
Cu 45 : cho kf = 1,5 ; Imax = 2A . gi tr hiu dng thc ca vn-k ny l :
A . 2,7 AB. 6,2 A
C . 3,4 AD. 5,9 A
Cu 46 : Mt ampe-k dng c cu o t in c in tr c cu o Rm = 99 v dng lm lch ti a Imax =0,1ma . in tr Shunt c Rs = 1 ohm . Xc nh gi tr dng in tng cng i qua Dm .
A . 10ma
B . 5ma
C . 2,5ma
D . 15 ma
Cu 47 : Mt c cu o t in c I = 100A , in tr ni khung quay R=1k . Ga tr in tr shunt mc vo c cu o tr thnh mt ampe-k tng ng vi tm o 100ma l :
A . 1 ohmB. 2 ohm
C . 0,1 ohm D. 0,2 ohm.
Cu 48 :
A . 10ma ; 100ma ; 1A B. 10ma ; 1A ; 5A
C . 1A ; 100ma ; 3AD. 1A ; 10ma ; 1A
Cu 49 : Cho c cu o t in Imax = 100A , in tr ni Rm = 1k c dng lm vn k DC . Tnh in tr tm o vn k c Vtd =100V .
A . 999k
B . 788k
C . 1100k
D . 1200k
Cu 50 : : Cho c cu o t in Imax = 100A , in tr ni Rm = 1k c dng lm vn k DC , in tr tm o vn k c Vtd =100V l 999k . Xc nh gi tr in p hai u vn-k khi kim ch th c lch 0,5Dm l :
A . 50V
B . 75V
C .100V
D . 25V
CU 51 : Mt Vn k c tm o 5V , c mc vo mch
o in p hai u in tr R2 nh hnh v .
Ga tr in p VR2 khi cha c vn k l :
A . 10V B.5V
C .15VD.20V
CU 52 : Mt Vn k c tm o 5V , c mc vo mch
o in p hai u in tr R2 nh hnh v .
Ga tr in p VR2 khi c vn k ,c nhy l
L 20k/V. :
A . 3,87VB. 4,89V
C. 2,53VD. 6,56V
CU 53 : Gi tr in p hai u c cu o t in c Rm = 850 v Ifs = 100A khi kim lch ti a l :
A . 85mV B. 100 mV
C . 125 mVD. 200 mV
CU 54 : Mt c cu o t in c Ifs =1ma v in tr dy qun Rm =500 ohm kt hp mch chnh lu bn k tr thnh vn k AC . nhy vn k AC l :
A . 450/VB. 900/V
C . 1000/VD. 200/V
CU 55 : Mt c cu o t in c Ifs =1ma v in tr dy qun Rm =500 ohm kt hp mch chnh lu bn k tr thnh vn k AC . Xc nh gi tr in tr tm o vn-k c Vtd = 30V l :
A . 13k
B . 18k
C . 21k
D . 5k
Cu 56: Mt c cu o t in c Ifs =200A v in tr dy qun Rm =500 ohm kt hp mch chnh lu ton k tr thnh vn k AC . Xc nh gi tr in tr tm o vn-k c Vtd = 50V l :
A . 133,9k
B . 224,4k
C . 211,2k
D . 578,5k
Cu 57 : u im ca o dng/p dng phng php nhit in c in so vi phng php chnh lu l :
A . n gin , r tin
B . khng b nh hng ca mi trng
C . c th o tn hiu c dng xung bt k
D . Hot ng n nh.
Cu 58 : Nguyn l o dng DC trong ampe k in t l :
A . Chuyn dng cn o thnh in p cho php
B . Thay i s vng dy trong mch
C . to ra dng in cc mnh trong in p
D . phn chia in p thnh cc in p nh.
Cu 59 : Cho mch nh hnh v sau :
Vn-k c nhy 10k ch 500V v ampe- k ch 0,5A c RA =10 . Vn k t tm o 1000V . Ga tr in tr ca Rx l :
A . 990B. 1000
C . 1350D. 2000
CU 60 : Cho Eb =1,5V ; Imax =100A ; R1+Rm = 15k. Xc nh ch th ca kim khi Rx =0 v s ch th s in tr khi Im =1/2 thang o l :
A . 15000ohm
B . 25000ohm
C . 10000ohm
D . 32000ohm
Cu 61 : Cho s mch o in tr bng ohm-k nh hnh v :
Cho Eb = 1,5V ; R1 =15k ; Rm =1k ; R2 = 1k ; Imax = 50A . Xc nh gi tr ca Rx khi 3/4 thang o l :
A . 5kB. 10k
C . 15kD . 20k
Cu 62 : Bit Eb = 1,3V ; ; R1 =15k ; Rm =50 ; Ifs = 50A .
Ga tr R2 mi l :
A . 35,75 ohm B. 68,18 ohm
C . 45,76 ohmD . 98,4 ohm .
Cu 63 : Bit Eb = 1,3V ; ; R1 =15k ; Rm =50 ;Ifs = 50A .
Ga tr Rx bao nhiu khi tr ch th thang o .
A . 5k
B . 10k
C . 15k
D . 20k
Cu 64 : Cho s dng cu wheatstone cn bng nh hnh v :
Cu pht biu no sau y ng cho trng hp trn :
A . Dng in qua in k khng thay i
B . VP = VR
C . R =S
D. VR =VP
CU 65 : u im ca php o in tr dng cu Wheatstone cn bng l :
A . khng ph thuc vo ngun cung cp E v ph thuc vo nhy ca in k
B . Ph thuc vo dong in tr ni
C . ph thuc hon ton vo nhy ca in k
D . to s cn bng tt cho in tr
Cu 66 : Cho sai s ca S l ; P ,Q l 1% . Sai s ca R l :
A . 0,5%B. 1%
C . 1,5%D. 2,5%
Cu 67 : Cho wheatstone cn bng nh hnh v :
Cho P = 1W ; Q = 10W ; S =237,5 ohm. Khi cu cn bng , gi tr R l:
A . 23,75
B . 2375
C . 2,375
D . 0,2375
Cu 68 : Cho s o in tr dng cu Wheatstone khng cn bng nh hnh v :
Tng tr ng ra ca cu xc nh theo cng thc l :
A . r = [P // R] +[Q // S]B. r =[P //Q] + [R//S]
C . r = [P // S]+[Q // R]D. r = [P+R] //[ Q+S]
CU 69 : Cho s o in tr dng cu Wheatstone khng cn bng nh hnh v :
Dng in chy qua in k khi cu khng cn bng :
A . Ig = B . Ig =
C . Ig = D . Ig =
Cu 70* : Cho ohm k thng c chnh , c ngun cp l 5V , in tr chun tm o R1 = 50k , s dng c cu ch th t in c R2 = Rm = 1 k , dng ti a qua c cu ch th l 50A . Gc quay kim ch th v tr qc quay ln nht .
in tr cn o c gi tr l bao nhiu :
A . 50K *
B . 100K
C . 150K
D . 200K
CU 71 : Loi no di y dng o in tr c gi tr nh l :
A . Cu Wheatstone cn bng
B . cu Wheatstone khng cn bng.
C . cu i KelVin .
D . Vn k v microampe-k
Cu 72 : o in tr trong V.O.M in t c ghi R00 tr s c trn mt ch th l 36 th c kt qu o nh th no l ng nht :
A . 3600
B . 360
C . 36
D . 0,036
Cu 73 : cho mch o nh hnh v sau :
Dng in chy qua c cu o kim ch th ca Ohm-k khi s dng tm o R trong trng hp Rx =0 l :
A . 622,4
B . 534,8A
C . 783,9A
D . 845,6A
CU 74 : Ta o in tr bng phng php V v A c mc r di . Ampe-k ch 0,5A , vn-k ch 500V . Ampe-k c Ra = 10 , vn k s dng tm o 1000V v c nhy l 10k/v . Tnh tr gi ca R l :
A . 500 ohm
B . 700 ohm
C . 990ohm
D . 1000 ohm
Cu 75 : Mt Ohm-k ni tip c cc thnh phn sau : ngun cung cp Eb =3V , in tr ni tip R1 = 30k , in tr shunt R2 = 50 ohm , c cu o c Ifs = 50 , in tr c c cu o Rm = 50 ohm .
Ga tr Rx o c tng ng vi lch FSD l :
A . 75k
B . 100k
C . 90k
D . 110k
Cu 76 : Ga s ohm-k cu 75 c Eb gim xung cn 2,5V . xc nh li gi tr R2 mi cn iu chnh l :
A . 50 ohmB. 100ohm
C . 75,2 ohmD. 45,8 ohm .
Cu 77 : o in dung bng vn k , ampe k , watl-k cho nh hnh v :
Gi tr in dung tnh theo cng thc no sau y :
A . CX = B. CX =
C . CX = D. CX =
Cu 78 : o in dung v in cm dng Wheatstone xoay chiu cn bng nh hnh v sau :
iu kin cn bng no sau y l chnh xc nht trong qu trnh cn bng :
A . B. Re =Re
C. Z1.Z4=Z2.Z3D.
CU 79 : Cu o in dung mc theo s hnh sau :
Ga tr in dung khi cu cn bng xc nh theo cng thc :
A . CX = B. CX =
C . CX = R3R4C1 D. CX = 0.
Cu 80 : H s tn hao ca t in c tr s nh mch tng ng c tnh theo cng thc sau :
A . Rx/CXB. RXCX
C . 1/CxRxD. CX/RX
CU 81 : : H s tn hao ca t in c tr s ln mch tng ng c tnh theo cng thc sau :
A . Rx/CxB. RXCX
C . 1/CXRXD. WCX/RX
Cu 82 : H s phm cht ca cun dy c tr s nh mch tng ng c tnh theo cng thc sau :
A . LX/RXB. RX/LX
C . LXRXD. 1/RXLX
CU 83 : H s phm cht ca cun dy c tr s ln mch tng ng c tnh theo cng thc sau :
A . RXLXB. LX/RX
C . LXRXD. 1/RXLX
CU 84 : Cho cu ph qut o in dung nh hnh v l :
Cng thc tnh gi tr Cx l :
A . CX = B. CX =
C . CX = 1/R3R4C1D. R3R4C1
CU 85 : Cho cu ph qut o in dung nh hnh v l :
Ga tr h s tn hao D l :
A . D = C1R1 B . D = CXRX
C . D = 1/C1R1 D. D = C1/R1
CU 86 : Cho nh hnh v sau :
C1 = 0,1A; R3 = 10k . iu chnh R1 = 125 ohm ; R4 = 14,7 kohm th cu cn bng xc nh gi tr tn hao D l :
A . 0,008D. 0,001
B . 0,16C. 0,0032
CU 87 : cho cu ph qut o in cm nh hnh v :
Ga tr Lx cn tm l :
A . C3R1R4
B . C3R1/R4
C. 1/C3R1R4
D . R1R4/C3
CU 88 : cho cu ph qut o in cm nh hnh v :
GI tr h s phm cht ca cun dy l :
A . C3R3B. 1/R3C3
C .C3/R3D. R3/C3
CU 89 : Trong cu Maxwell nh hnh v trn , in dung mu C3 = 0,1F , tn s tn hiu cung cp cho cu f=100Hz . Khi cu cn bng R1 = 1,26k ; R3 =470 ohm ; R4 = 500 ohm . Ga tr h s in cm
A . 63mhB. 126mh
C. 50mhD. 75mh.
Cu 90 : Trong cu Maxwell nh hnh v trn , in dung mu C3 = 0,1F , tn s tn hiu cung cp cho cu f=100Hz . Khi cu cn bng R1 = 1,26k ; R3 =470 ohm ; R4 = 500 ohm . Ga tr h s phm cht ca cun dy l :
A . 1578
B . 29540 x
C . 35882x
D . 10892x
Cu 91 : Cho cu o in dung nh hnh v sau :
Cho C1 = 0,1A ; R3 = 10k . Bit rng cu cn bng khi ngun cung cp c f= 100Hz ;
R1=125ohm v R4=14,7k. Ga tr in dung ca cu l :
A . 0,068
B. 0,15F
C . 0,098F
D.0,01F
CU 92 : Cho cu o in dung nh hnh sau :
Bit thnh phn mu c C1=0,1F; R3=10k. Cu cn bng khi ngun cung cp c f=100Hz ; R1=375 ohm ;R4= 14,7k. Gi tr h s tn hao ca t l :
A . 42,5
B . 45,8
C . 58,8
D . 22.4
Cu 93 : Cu Maxwell o in cm nh hnh v sau :
C3 =0,1F ; ngun cung cp c tn s f=100Hz . Cu cn bng khi R1=1,26k ; R3=470 v R4=500.
H s phm cht l
A . 0,03
B . 1,21
C . 0,08
D . 2,35
Cu 94 : Cho hnh v cu Hay sau :
C ngun cung cp f=100Hz cn bng khi C3=0,1F ; R1=1,26k, R3=75 ; R4=500.
H s phm cht ca cun dy l :
A . 212
B . 257
C . 435
D . 200
Cu 95 : Tnh thnh phn tng ng ca Ls ca cun dy c Lp = 63mh ; Rp=8,4k , c tn s f=100Hz.
A .
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