TRIJdNG DHSPKTTPHCM
KHOADrEN-pmN r0
EETHI0I ( 07tr ang)
M6n: AN TOAN DIEN
Dirngchociicl6p:081022A
Thdi gian: 60 phrit
(SV kh6ng iltloc sir dung tdi li6u)
1.Tidp xfc gi6ntidp ld tidp xric vdi:
a. Vd dQngco b! rd di€n
b. DAy ddn diQnkh1ng boc cdch diAn
c. Tudng,nAnbi rd diQn
d. COngtdc bi ht cd.chdiAn
2. DiQn6p btrdcxut't hi6n khi ndo:
a. Ddy ddn bi hu cdchdi€n
b. Vo dQngco bi champha
c. Ddy ddn diQnbi dtr t,d rrti xu6'ngddt
d. Tudngbi nhi6mdiAn
3. Gi6 tri di6n tr6 hic binh thrrdngld baonhi6u?
a . 6 0 -1 0 0 0O
b. 80-t.000o
c . 6 0 -8 0 0O
d. 10.000-r00.000o
4. Di€n trd cria cd thd ngddi 6nh hrrdngnhu thd nio ddi vdi mfic d6 tiic hai cfia ddng ili6n
qua ngddi?
a. DiQn tr& ngutdildn, mtc dQ tdc lmi tdng
b. DiQn trd ngadi nh6, mtc dQ tdc hqi gidm
'
c. EiQn tr& ngtdi nh6, mftc dQ tdc hai tdng d. Kh6ng xdc dinh dtqc
5. Ddng di€n qua ngudi khi ngrrdicham vdo I ctrc cia m4ng di6n 3 pha di6n r{p d6y U,
tAn sd f, diQntrd c6ch di6n cfra dAy din so vdi da'tR., di6n dung C vd cti6ntrd Rnnilddc
xdc clinhbhngbidu thfc sau:
o.rnx=+,
II
)
= -L(
b. I...
4r
Rr"
(R, + 6R,,)
II
C. , , r = *,
+6R,*)
|, R,(R.
' - (H n,'-tc')R*
(1. 1 .. -- -_ 1
"r
R,,"
iL{.' + 6R,,,)
9(l+ Rjco2C21R,,,
6 . Di6n 6p tidp xric ldn nhl't cho ph6p d4t l6n ngudi trong didu ki6n kh6 16otheo TCVN
ld:
a. U"pec=50V, Ucppc= 80V
b. U.pac=50V, U,.prc=I00V
c.Urpec= 60V, Utppc= 80V
d. Urp,qc=60V, U,.pDC=
I00V
7. Nguydnnhdn ndo kh6ng phii ld nguy6nnhAndAnddn tai nan ddi vdi di6n dp th6'p:
a. Cham tr(c tidp vito y\t rnangdiAn
b. Ltip d(r cdc thiA'tbi chi€'usdng
c. Rd ri di€n & cdc dung cu cdm tay
d. Bi phdng di€n b&i di€n dp cao
8. d ngaych6chamdt't,diQntrd cfradi't se
do ddngchayquadiOntichnh6.Cing
xa vi tri ndy,di6ntrd cfradA'tsE
theokhodngci{ch,sd sut6p di6nthd s6 nh6.
a. ldn vd gidm
b. nh6 vd rdng
c. nhd vd.gidm
d. ldn yd tdng
Cdn b0 coi thi khong gidi thfch gi thAnt
Page1
9. Di6n 6p br/dcU5chlocxiic dinhbhngbidurhfc sau:
a. [ J o=
I'P'a
'
2r(x + a)
I'P 'a
c. ( J^=
' Zn(x - a)
b. Uo=
d. (J^=
'
I 'y'a
2 r(x + a )
I'P'a
2r.x(x + a)
10.EiQn5p tidp xtic mi ngudis€ chiu t6c dungkhi dungngaytr6ncuc n6i d6t ta:
a.Uu-Ud-U,=0
b. U,, = Ru . 1,,
c. Uo =U,
d . U, " = Uu
1l. Trongthuctd do di6n trd ngudithayddi rrongphamvi r6'tr6ng,vi vay dd an
todncho
ngdditrongmoi rrddnghdp,dien 6p tidp xric U1 cancd gi6 tri:
a. < 25V
b. <50v
c.
IN,
d. 0.5 I L,,< I
I
^<
^n
51.Dd dim b6o b6o vO ph6nbiQtgiirahai thidt bi b6o vQ chdngddngrd mdc ndi tidp,
cricthidtbf ndy phii th6acA hai didu kiQnsau:(1) D4c tuydnkhOngt6c cl6ngddng-thdi
. so vdi thidt bi chdngddng
giancfrathidt bi chdngddngrd d4t 6 phiangudnph6i .
rb d phia tai, (2) Ddng tric clQngclinhmfc crla thidt bi chdngddng rd d4t d phia ngu6n
phii ...... ddngttinhmfc cfiathidtbi chdngddngrd dfltd phiatii:
b. I- ndm ffAn & 2- nhd hon
a. I- niim ffAn & 2- ldn hon
d.1- ndm dudi & 2- nhd hon
c. 1- ndmdrdi & 2- ldn hrtn
52.Khuydtdidm ldn nh6'tcfrasd dd tx ta:
b. Khing cri khd ndng bdo v€ diAn gigt
a. Sod6 phtc tqp
d. Nguyco hoa hoan cao
53. Trong m?ng 3 pha c6 trungtinh ndi Aa't,Oidmndo kh6ng lh r-ruti€n cfia mang:
a. Khi xdy ra ngiin mach I plru cham ddi, tdc dQngciit ngu6n vdi thdi g,ianngdn
b. Ddm bdo tinh hAn nc cung cA'pdiAn
c. Gidm bdt su nguy hidm do clnm dd'tgdy n€n
c. ton Kem
2
r^\
d. IaI ca aeu sal
54.MangdiQnduqcrhrlchi6n b6o v€ ndi aay trungtinh khi t[ng sd ndi d6'tlap l4i thi:
b. Gidm diQndp ri|fu xtic
a. TdngdiQndp budc
d. Gidm diQndp budc
c.TdngdiQndp tidp xilc
55.EiQntrd cfrahQthdngndi dA'tphu thuQcv d o :
b. Khoang cdch giira cdc cpc
a. ChiAuddi coc ndi ddt
d. Td't cd d0u dung
c. Ei€n tro sudtcia dat
56. MQt ngudi cham tr{c tidp vdo hai ctlc cfia m4ng
di6n TT. Ddng cli6nchay qua ngddi li bao nhi€u khi
Rng- 1000Q?
diQn6p ngu6n 3801220Y,
a. l27mA
c . 3 8 0 mA
b.220r nA
d.440m A
Ro
57. MOt ngr/dichamgir{ntidp vdo mangdi6n TT, di6n 6p tidp xtic d4t l6n ngudibing
R6=Bo-4f) voi Rp lhdiQntro n6i d6t
Rng=1gggf),
baonhi6ukhi tliQn6p ngudn3801220V,
chothititbi?
b. 220v
a . 1 1 0V
Cdn b0 coi thi khong giai thich gi th€n
Page6
c. 380V
58. Chom4ngdiQn
d. K€t qua khdc
= I 1(V), diQntrd ngucriRne= 1 (KQ)' Rn =0,
Cho U,6 virricham
Rno= 4(Q). Ddng diQnqua nguoi ld:
a. Ing = 10,95mA
b. Inx = 1095 mA
c. Irt<= 10A
d. Ins= 20A
59. Ngucri dimg cr{ch ch6 ch4m dAt x = I l00cm, ddng diQn
cham d6t tu = 10004, diQntro su6t cira d6t p6 = 100 Q.m, bucvc
chdn a = 0.8m.DiQn6p budc li:
a. U6 = 1.05 V
c. U6 = 25.4 V
b. Ub = 98.09 V
d. Ket qud khdc
60.Dbng Utx
a. Ua = U,.,
C. U,, = Ua- Ut,
d. Ud < Utx
20m ld:
9. DiQn 6p tidp xric md ngddi sOchiu t6c dung khi o ngodi
a.Uu=Ua-U,
b.Uu=R,t'l,t
c' U,, =U,
d' U,, =U,
10.C6cthinh phdndiQntrd cirabQphQnndi ddt E9 g<\
Cdn b0 coi thi khong Siai thich gi thAn
a. DiQntr& tdn crtactc n6'idd'r(kd cd diQntr7 fia'pxric).
b. Di€n tr6 thudncfia bdn than cuc n6'idd'rvd ddy ndi ddt.
c. EiQntr& thudncrtabdn thAnctc n6'iddi.
d. Cd avd b d)u dilng.
11.Theo dudngcong an todn (d4c ruydnthdi gian-diQndp),
vdi criQnd,pc6 gid tri u, =
50V,thdi gianchoph6pddngquangddild:
a. V6 han
b. 5s
c. I}s
d. Is
12.Nguydn nhdn kh6ng ph6i ln nguydn nhdn d6n ddn
a. Vi pham khodng cdch an rodn
tai nan ddi vdi mang cli6n6p cao:
b. Ddng crit cdc thi|i bi cao dp
c. Cdc ddy ddn boc cdch dien bi hu h6rtg
d. Sft d4ng diQn kh6ng dung qui cdch
13.Nguydn nhdn d6n ddn ho6 hoan vi chiiy ndvd
dicn:
a. 16 ) I,o
b. Ngiin mach
c. ChQpdi€n & m6i rrrdng hori cttd'td6 chdt, nd
14.Tidp xfc gidn tidp li tidp xfc vdi:
cl. Cd 3 cdu d)u dilng
a. V6 dQngco bi rd diQn
b. DAy ddn diQn kh6ng boc cdch di€n
c. Tudng, n)n bi rd diQn
d. COngtiic bi ht cdch dien
15.Di6n 6p budcxud'thiQnkhi ndo:
a. Ddy ddn bi hu cdchcti€n
b. V6dQngco bi champha
c. Ddy ddn di€n bi drrt t,d roi xu6'ngcrdt
d. Tudngbi nhi6mcti€n
16. d ngay ch6 cham dA't,cliOntrd cfia dd.tse
do ddng chay qua diQntich nh6.
cing xa vi tri ndy,di€n trd cfia da'ts€
theokho6ng cl,ch,sdsut rip ctiQnthd s€ nh6.
a. ldn vd.gidm
b. nhd vd tdn7
c. nhd vd gidm
d. ldn vd tdng
1 7 'N g u y d nn h d nn i o kh 6 n gp h i i l d nguyOn
nhandAnddntai nandoi vdi di6n6p th6.p:
a. Clnm trLtctidp vdo t'Qtrnungcrian
b. Liip ddt cdcrhi\i bi chi€'usang
c. Rd ri di€n & cdc dung cu cdm my
d. Bi ph6ngcriQnb&i di€n dp cao
18' Khoing cr{chnh6 nh6'ttheoquy ttinh cAmnguoi dOngAn
thict bi di6n ngoaitroi khi xdy
ra chamd6t:
a .4m - 5 m
b . 8 m - I )n t
c.2 m - 4 m
d.6m - 8m
19.Kho6ngcdch an todn phu thu6cvio:
a. EiQndp
c. Stc khdecon ngudi
b. Cdchdi€nctia mang
( diQn
d. DOdm kh6nskhi
20.Di€n trd crjangddiphu thu6cvio cticydu td nio?
a. Tinh trang ldp sitng tr/n da
c. Trang thdi bQnhtj.
b. DiQn tich yd cip sud'tilA'p xtic
d. Cd 3 cdu diu dilng
21.Ei€n 5p budckh6ngphu thuQcvdo ydu td nio?
a. Khodngcdchbudcchdn ngtdi
Cdn bd coi thi khong gidi thich si th€m
6. Ddng cliOncha1,trong dd.t
Page2
cham ddt
c. Khodng cdch til chdn ngudi ddn didnt
d. Tidt di€n ddy ddn
22.DiQn6pbrrdcphr;thuQcvio ydu td nio:
vitdidmndi ddt
a. Khodngcdchtit vd thiAl bi r)uqcndt ddt
b. Vbng trbn ddng thA'
d . Ch ic 6 a v d c
c. Mtlc d0 cdn bdng thd
l€n ngddi trong didu kiQn kh6 rrlo theo TCVN
23.DiQn6p tidp xric ldn nhdtchoph6pd4t
ld:
a.Urpec= 50V,Ucpttc=80V
c.Urpec= 60V,Uc4tc= 80V
b'U'p'qc=50V' U'pDC=l00V
d'U.pqc= 60V' U'pDC--100V
coc
ndi ddt t6'p trung, khoing c6ch giira c6c
24.Dd loai tril hiQu rlng min che trong
cria
(hiQufrng ldm gi6m khi ndng tin ddng cham ddt
rhudngbxng mdy 6n chidu cldi coc
mdt coc vdo virng ddt lin cQn):
b. 2.s
a. l
d' 3
c.2
hidm khi:
25.Khi c6 hiQntddngchamclt't,ngudig4pnguy
a. Khodngcdchso didmclmmddt ngodi20m
b. Drtngrdt gdn tlidm chamdA't
girtahai chanrdt nh6
; ;:i;, caci adm chqmddt vd khodngcdch
d. DrtngtAn vdngtrbn ttdngrhd
khi:
26.Khi bi chamv6' tli€n 6p tidp xric sEbhng0
b. Dtng tr€n vdng trbn ddng thA'
a. DirngtrAnghdcdchdtQn
kim loai drrQcndi vdi thidt bi
rut'
c t, sdn
attr?n
lJUIlS
c.
L, Etng
d . Ch ic 6 a v d c
ki€
dd ki6m
gi6n'd6
th6ac6c ydu td: Sd dd don gi6n,
2,l.Dlcdidm cfia hQthdngndi Odtndo saudAy
duocnguycd h6a hoan'
tra,bio dddng,c6 thd md iqng ho4ccii tao; chdng
b. He thdngTN'C
a.He thdngIT
d. He thdns TT
c. HQthdngfN-S
cria mqng di6n TT'
28. MOt ngddi cham tnJc ddp vho hai ctJc
khi di€n 6p ngudn
Ddng di6n chay qua ngddi li bao nhiOu
Rng- 1000f)?
3801220V,
a. l27mA
b.220mA
c.380mA
d.440mA
U
--->
TN'
29.MOtngddichamgi6ntidp vdo mangdi6n
diQn6p tidp xric dat 16nngddibhngbaonhi6ukhi
Rng- 1000Q'Rn=RP=
6p ngudn3801220V.
khi diQ,n
4f), vcriRp lddiQntrd n6i d6tchothii5tbi?
a.60V
c. II0V
Cin bAcoi thi khonggidi thichgi th€m
b.80v
d. 120v
Page3
30. Nguoi dimg cdch ch5 ch4m d6t x = l l00cm, ddng di6n
chamd6t tu= 10004,diQnrro su6tcira d6t p6= 100O.rn,UuO.
chdna = 0.8m.DiQnrip buocli:
a. U6 = 1.05 V
b. Ub = 98.09 V
c. U6 = 25.4 V
U
trl
rro
d. K€t qud khtic
___tl
<31. Khi ngddi cham vio I cr-/ccria m?ng di6n I pha. Bidt di6n
6p U=220 V, Rnn= lkf),
Rndn=l0kQ, Ro = 4f). Bo qua dQ sqt iip do R6, Rp, 21,i1,
__,rV-\
Ddng ili6n qua ngddi c6 gi6 tri ld bao nhi6u:
a. 20 mA
b. 18 mA
c.19mA
khdc
d. K?'tqud
32. Di6n 6p ti€p xfc Utxl vd Utx2 khi ngrrdicham
gi6n tidp vio mang di€n 3 pha ili6n dp U= 3g0/220V,
di6ntrd.Rne=lkO, Rpl=le, Rp2= lge vcyiRp lidiQn
trd n6i dAtchothititbi, cd gi6tri ld baonhi6u?
a. Utxl = 360 V vd Utx2 = 20 V
b. Utxl = 20 V vd Urx2= 360 V
c. Utxl = 2l V vd Utx2 = 2l V
d. Ket qua khdc
33. Trddng hop ndo di6n 6p pha s6 thay ddi ndu l pha cham cla.t:
a. Mang 3 pha cd trung tinh ngu6n n6'i ttdt
b. Mqng 3 pha c6 trung tinh ngudn hodn todn c(tch ty
c. Mang 3 pha c6 trung tfnh ngu6n cdch ly qua m6t tr& khdng 22.
d. TAi cd d0u sai
34. Trong mang 3 pha c6 trung tinh ndi ddt, didm nio kh6ng l)
uu ti€n cria mang:
a. Khi xdy ra ngiin mach I pha cham dd't,tdc dQngciit rgu6n vdi
thdi gian ngdn
b. Ddm bdo t{nh hln nc cung cd'pdi\n
c. Gidm bdt su nguy hidnt do cham tl6't gd1,n€n
d. Tdt cd d|u sai
35. Khuydt didm ldn nh6'tcr.iasd Od tN ta:
a. Sodd plulc rqp
b. Kh6ngc6 khd ndng bdo v0 tti€n gidt
c. Tdn kdnt
d. Nguyco hod hoancao
36.Ndi ddtan toin ld:
a. N6'i ddi ddy trung ttnh
b. N6'i dd'tv6 thiei bi
c. Ndi dAi he thdng ch6hgsir
d. Tdt cd cdc trtdng hop tAn
37. Trddnghop ndo nguy hidnr hdn khi con ngddi cham vio I pha
cia mach 3 pha:
a. C6 trung ttnh cdch ly
b. C6 trung tinh n6'i ddi
c. Cd trung t{nh cdch ly qua c'u6nkhdng c6 tinh cdm cao
d. Tdt cd ddu sai
38' Mang di6n duoc thdc hicn b6o vd ndi day ffung rinh khi tdng
sd ndi da'ttAp tai thi:
a. Tdng diQn dp budc
b. Gidm diQndp fiA'pxtic
Cdn bo coi thi kh6ng gidi thich gi th€n
Page4
d. GidmdiQndp budc
c.TdngdiQndp tidp xilc
39.DiQntrd criahQthdngndi Adtphu thuQcvdo:
b. Khodngcdchgiira cdc c7c
a. Chi6uddi cpc ndi ddt
d- Tdt cd diu dung
c. Ei€n tro sudtcila diit
40.DiQn6p budcU5ddQcx6c dinhbhngbidu thficsau:
I ' P'a
b. r yt= !L
a . ( J ^=
2r(x + a)
2tr(x+ a)
I ' P'a
d. uo==L
c"'-h
. IJ^=
"
Zn'x(x+a)
2r6-a)
41. Trong hQ thdng diQn nho sau ilAy: khi hd h6ng cr{chcli6n,ddng su cd g6y sut t{p
ngudn,nhi6u diQntil ldn vh c,i khd n[ng gly ch6y cao.
b. He h6'ng TN- C
a. He thdng IT
c. HQ thdng TT
d. He thdng TN'S
42. Chfic ndng cfia dao c6ch ly:
a. E6ng ciit c6 tdi
b. D6ng ciit kh\ng rdi
c. Cdch ty
d. Cdu b & c diu dilng
43. D6m b6o bio vO c6 chon loc ld:
a. Ndu CB nhdnh khbng tdc dQngthi CII nhdnh ch{nh tdc dQng
b. Qud tdi & nhdnhphq tli CB nhdnhphryphdi tdc d6ng
c. Ngdn mach & nhdnh ndo tlti chi CB nlfinlt do tdc dQng
d. CB nhdnh chinhvd CB nhdnhphu cilng tdc dQng
44. Chtc ndng chinh cria RCCB li:
a. Bdo vQchdng ddng rb xu6'ngddt
b. Cdch ly
c. Phdn cloaniludng cJAy
d. Ddng ciit tdi
45. Cdu nio sai vdi MCB:
a. Ddng dinh mtc ti( 63A +2000A
b. Vd dilc
c. Ddng ctit ngtin mqch 25 kA +65 kA
d. 2, 3, 4 c{c
46. Chon ddyl c6pt I*
c. Io:0.5 I^ ,
d. 0.5 I
I
I N,
^,,< ^<
49.DiQnr{p tidp xric mi ngr/di sEchiu tiic dungkhi drmg
ngaytr6nc,,rcn6i d6t ta:
a. U,, -Ud -U, = 0
b.U,.,=Ru' lu
c. U o=U,
d. u,.,=u,
50' Trongthuctd do diQntrd ngddithayddi rrongphamvi r6'tr6ng,
vi vay dd an todncho
ngtrditrongmoi trddnghop,dien 6p tidp xric U1 cdncd gi6 tri:
a. < 25V
b. <50v
c.
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