TRC NGHIM MN MY IN CUI K.Cu 1 :Nguyn l lm vic ca my in da theo:A
. nh lut cm ng in t , lc in t B . nh lut ohm t C . nh lut faraday,
nh lut ton dng inD . nh lut t trng
Cu 2 : Khi thanh dn chuyn ng thng vung gc vi ng sc t trng , 2 u
thanh dn xut hin :A . sc in ngB. lc in tC . t trng ca dng inD. Dng
in chy qua thanh dn
Cu 3 : Khi thanh dn mang dng in t thng gc vi ng sc t , thanh dn
s chu :A . sc in ngB. lc in tC . t trng ca dng inD. Dng in chy qua
thanh dn
Cu 4 : My in c phn loi theo nguyn l bin i nng lng bao gm :A . my
in tnh , my in quay B. my in xoay chiu , mt chiuC . my pht in ng b
, khng ng bD. My in mt chiu ,my bin p
Cu 5 : Loi my in no sau y thuc my in tnh l :A . my bin pB. my in
xoay chiuC . my in mt chiuD. ng c in mt chiu
Cu 6 : Thanh dn c chiu di l=0.5m. Nm trong t trng u c B=1,4T
,chuyn ng vi vn tc v= 20 m/s . Hai u thanh dn ni vi R= 0.5 to thnh
vng kn .Xc nh sc in ng cm ng trong thanh dn :A . 28B. 14VC . 7 VD.
11V
Cu 7 : Thanh dn c chiu di l=0.5m. Nm trong t trng u c B=1,4T
,chuyn ng vi vn tc v= 20 m/s . Hai u thanh dn ni vi R= 0.5 to thnh
vng knXc nh cng sut c tc ng vo thanh dnA . 392 WB. 196WC . 200WD.
160W
Cu 8 : Thanh dn c chiu di l= 2m c dng in I=150mA chy qua , t
vung gc vi t trng u B= 2T hng t tri qua . Tnh lc in t tc ng l :A .
0,36 NB. 0,6 NC . 0,72 ND. 1 N
Cu 9 :
A . 0,9 A B. 1,8AC . 0,6 AD. 0,3 A
Cu 10 : Mt my in ty nng lng a vo nh my in c th lm vic ch ng c
hay my pht , vy my in c :A . c tnh thun nghchB. bin i dng in C . to
ra sc in ngD. To lc in t
Cu 11 :i vi cc b phn dn in khc nh vnh trt , lng sc ngi ta dng
thm hp kim ng , nhm , hoc thp nhm :A . tng bn c hc v gim kim loi
muB . tng cng dng in ln C . chng n mn kim loi D . gim hao t tr v
dng xoy
Cu 12 : Loi vt liu no dng lm vt liu dn in :A . ng , nhmB. vng ,
nhmC . st , ngD. ng , ch
Cu 13 :Nhng on mch t thng bin i vi tn s 50 60 Hz , ngi ta dng
thp dy 0,35-0.5mm c pha thm 2-5% si nhm :A . tng bn c hc v gim kim
loi muB . tng cng dng in ln C . chng n mn kim loi D . gim hao t tr
v dng xoy
Cu 14 : Mt mch t c t tr = 1500At/Wb. Trn mch t ngi ta qun mt cun
dy bng nhm c s vng l N = 200vng, khi t in p mt chiu U = 24V ln cun
dy th dng in l I = 3A. Xc nh t thng trong li thp :A . 0,4 WbB. 40
WbC . 2,5 Wb D. 1,5 Wb
Cu 15 : . Mt li thp hnh xuyn c lm bng vt liu st t c chiu di
trung bnh l = 1.4m v tit din ngang S = 0.11m2. t thm ca li thp l
1.20610-3Wb/At.m. Xc nh t tr ca mch tA . 8,398.B. 10.55. C .
65,32D. 75,89.
Cu 16 : Mt mch t c chiu di trung bnh l = 1.4m v tit din ngang S
= 0.25m2. Dy qun kch thch qun trn mch t c N = 140vng, in tr R = 30
. Xc nh in p ngun cn thit t cn trong li bng 1.56T. Cho rng t tr ca
mch t trong trng hp ny l = 768At/WbA . 4 VB. 64.17 VC . 35.75 VD.
31,67 V
Cu 17 : Mt mch t c lm bng cc l thp c chiu di trung bnh l = 1.3m
v tit din ngang S = 0.024m2. Cun dy qun trn mch t c N = 50vng, in
tr R = 0.82 v khi ni ngun mt chiu vo cun dy th dng in qua cun dy l
2A. T tr ca mch t trong iu kin ny l = 7425At/Wb. Xc nh cng t cm A .
0.56 TB. 0.28 TC . 0.72 TD. 0,36 T
Cu 18 : Mt mch t c chiu di trung bnh l = 0.8m v tit din ngang S
= 0.06m2. t thm tng i ca li thp l r = 2167. Cun dy qun trn mch t c
N = 340vng, in tr R = 64 v c ni ngun mt chiu 56V. Xc nh t cm trong
li thp. A . 1.012 TB. 2.01 TC . 2,5 TD. 0.75 T
Cu 19 : Mt cun dy qun trn li thp c cung cp t ngun xoay chiu c U
= 120V, f = 25Hz. Tn hao do dng in xoy thay i th no khi cun dy c ni
vi ngun c U = 120V, f = 60HzA . B. C . D.
Cu 20 : Cu no sau y nh ngha my bin p l chnh sc nht :A . my bin p
l thit b t tnh , lm vic theo nguyn l cm ng in t bin i dng in vi tn
s khng thay iB . my bin p l thit b t quay , lm vic theo nguyn l cm
ng in t bin i dng in vi tn s khng thay iC . my bin p l thit b t tnh
, lm vic theo nguyn l cm ng in t bin i dng in vi tn s thay iD . my
bin p l thit b hot ng theo nguyn l cm ng in t c tnh thun nghch
Cu 21 : My bin p gm phn chnh :A . li thp ,dy qunB. dy qun , mch
tC . li thp , mch tD. V my , b phn lm mt
Cu 22 : Li thp ca my bin p thng c ghp bng cc l thp k thut in :A
. gim tn hao dng in xoyB . gim tn hao t trC . d lp rpD . mt kt qu
khc
Cu 23 :My bin p l thit b in c c im :A . cun dy s cp c cng tn s
vi cun dy th cpB . cun dy s cp c tn s ln hn vi cun dy th cpC . cun
dy s cp c tn s nh hn vi cun dy th cpD . kt qu khc
Cu 24 : My bin p mt pha c tn s 50 Hz , in p pha s cp l 220v , s
vng cun dy s cp l 880 vng , s vng cun s cp l 440 vng , in p th cp l
:A . 110vB. 220VC . 440V D. 880V
Cu 25 : Mt my bin p c t s vng 5:1 v dng in chy qua cun th cp l
5A. Ga s khng c tn hao dng in chy qua cun s cp l :A . 5AB. 1AC .
10AD. 25A
Cu 26 : Cho my bin p c tn s 50Hz c 1320 vng , cun dy s cp 6600V
,t cm cc i l 1,4T .Xc nh tit din ca li thp.A . 161 B. 130 C . 80 D.
40
Cu 27 : Phng trnh cn bng p pha s cp my bin p c dng :A . = - B. =
C. = D. = -
Cu 28 : Phng trnh cn bng p pha th cp my bin p c dng :A . = +B. =
-C . = +D. = -
Cu 29 : Trong s thay th my bin p , nhnh t ha c trng cho :A . tn
hao dng xoyB. tn hao t tr C . tn hao dng xoy v t tr D. Tn hao ng my
bin p
Cu 30 : Trong s thay th my bin p , nhnh t ha c trng cho :A . tn
hao dng xoyB. tn hao t tr C . tn hao dng xoy v t tr D. Tn hao ng my
bin p
Cu 31 : Trong s thay th my bin p , in tr th cp qui v s cp tnh
bi:A . = B. = C . = D. = k.
Cu 32 : Trong s thay th my bin p , dng th cp qui v s cp tnh bi:A
. =B. = C . D.
Cu 33 : Trong s thay th my bin p , in p th cp qui v s cp tnh
bi:A . = kB. = C . =D. =
Cu 34 : Trong th nghim khng ti ca my bin p , nu cho th cp h mch
th in p t vo s cp l :A . B. 50%C . 30% D. 10%
Cu 35 : Cng sut o c trong th nghim khng ti my bin p chnh l : A .
tn hao ng s cp B. tn hao ng th cpC . tn hao st tD. Tn hao my bin
p
Cu 36 : cng sut o c trong th nghim ngn mch ca my bin p chnh l :A
. tn hao st tB . tn hao ng s cp C . tn hao ng th cpD . tn hao ng s
cp v th cp ti nh mc
Cu 37 : Mt my bin p c tr s p ngn mch % = 10 th khi b ngn mch th
cp th dng ngn mch s cp s c tr s :A . 20 B. 30 C . 10 D. 5
Cu 38 : Tn hao li thp ca my bin p c c im :A . khng ph thuc vo h
s tiB. t l thun vi bnh phng h s tiC . t l thun vi lp phng h s tiD.
T l thun h s ti
Cu 39 : Trong s thay th ca my bin p , thng s Rm v Xm c trng
cho:A . tn hao dng my bin pB. tn hao t trC . tn hao dng in xoyD. Tn
hao dng in xoy v t tr
Cu 40 : Tn hao dy qun ca my bin p c c im :A . khng ph thuc vo h
s tiB. t l thun vi bnh phng h s tiC . t l thun vi lp phng h s tiD.
T l thun h s ti
Cu 41 : Tn tht trong my bin p gm A . tn hao dy ngB. tn hao li
thp, tn hao dy ng v tn hao cC . tn hao li thp v tn hao dy ng D. Tn
hao mch t, tn hao c
Cu 42 : Trong th nghim ngn mch ca my bin p c gi tr :A . bng dng
nh mc s cpB. dng in nh mc s cpC . . bng dng nh mc th cpD. dng in nh
mc th cp
Cu 43 : Th nghim khng ti ca my bin p , tn hao khng ti A . chnh l
tn hao trn dy qun v li thp ca my bin pB . chnh l tn hao trn dy qun
my bin pC . chnh l tn hao li thp ca my bin pD . chnh l tn hao trn
cun dy th cp ca my bin p
Cu 44 : Trong th nghim ngn mch ca my bin p , tn hao ngn mch l :A
. chnh l tn hao trn dy qun v li thp ca my bin pB . chnh l tn hao
trn dy qun my bin pC . chnh l tn hao li thp ca my bin pD . chnh l
tn hao trn cun dy th cp ca my bin p
Cu 45 : Khi khng ti tng in p t vo my bin p th h s cng sut thay i
nh th no:A . h s cng sut khng thay i .B. h s cng sut nh hn hoc bng
0,1C . h s cng sut bng 0,1D. H s nh hn 0,1
Cu 46 : T ni dy ca my bin p biu th gc lch pha gia :A . sc in ng
dy qun s cp v sc in ng dy th cp .B . sc in ng pha s cp v sc in ng
pha th cpC . sc in ng gia cc pha s cpD . sc in ng gia cc pha th
cp
Cu 47 : Gi l s vng dy mi pha s cp v th cp ca my bin p 3 pha v
kiu u dy ca my bin p l Y/ th t s bin p :A . B. C . D.
Cu 48 : Nu my bin p 3 pha c t ni dy l Y/Y-11 th gc lch pha gia
in p dy s cp v th cp s l :A . B. C D.
Cu 49 : Nu my bin p 3 pha c t ni dy l Y/Y-12 th gc lch pha gia
in p dy s cp v th cp s l :A . B. C D.
Cu 50 : Ga s my I ni dy Y/Y -11 ,cn my II ni Y/Y-12 th gc lch in
p th cp ca hai my l :A . B. C D.
Cu 51 : Nguyn nhn ch yu gy ra s hao ph nng lng trong my bin th l
do:A. Hao ph nng lng di dng nhit nng to ra cc cun s cp v th cp ca
my bin thB. Li st c t tr v gy dng Fuc. C. C s tht thot nng lng di
dng bc x sng in t.D. C A, B, C u ng *
Cu 52 : Vai tr ca my bin p trong vic truyn ti in nng:A. Gim in
tr ca dy dn trn ng truyn ti gim hao ph trn ng truyn ti.B*. Tng hiu
in th truyn ti gim hao ph trn ng truyn ti.*B. Gim hiu in th truyn
ti gim hao ph trn ng truyn ti.D. Gim s tht thot nng lng di dng bc x
sng in t
Cu 53 : Trong my bin p, khi hiu in th mch th cp tng k ln th:A.
Cng dng in hiu dng mch th cp tng k ln.B. Tit din si dy mch th cp ln
hn tit din si dy mch s cp k ln.C. Cng dng in hiu dng mch th cp gim
i k ln.D. Hao phi trn ng dy gim i n^2 ln *
Cu 54 : Tn silic cn ngui ng hng l loi thp k thut in dn t tt
nhtA. dc theo hng cn B. ngang chiu cn C. v hngD. c 3 p n u ng
Cu 55 : Vt liu ch to my in gm 3 loi: vt liu tc dng ,vt liu kt cu
v vt liu cch in. Vt liu tc dng l.A. vt liu dn tB. vt liu dn inC. vt
liu dn t v dn inD. tn silic
Cu 56 : chuyn my bin p 3 pha t t ni dy Y/Y -4 v Y/Y-12 phi i th
t pha bn dy qun th cp theo th t . A. b-a-cB. c-a-bC. c-b-a D.
a-c-b
Cu 57 : Khi s dng my bin in p ( BU ) cn ch .A. khng ni tt mch th
cp my bin p B. khng h mch dy qun th cpC. ni tt mch th cp my bin p.
D. c A,B,C u sai
Cu 58 : . S truyn nng lng t dy qun s cp sang dy qun th cp ca my
bin p .A. thng qua mch tB. thng qua s bin thin ca C. thng qua mch
in v s bin thin ca D. c a v b
Cu 59 : . My bin p phn phi c dy trung tnh cung cp in 1 pha phi c
t ni dy.A. Y/ -11B. Y/Y-12 *C. / -4D. Y/ -7
Cu 60 : Biu thc xc nh sc in ng ca dy qun MBA A. B. C. D.
Cu 61 : . My bin p t ngu l loi my bin p c bit , ngoi cng sut
truyn qua mch t , cn c cng sut truyn qua mch in. Tng tn hao trong
my bin p t ngu so vi my bin p cm ng.A. ln hnB. nh hn *C. bng nhauD.
Khng c
Cu 62 : Vt liu ch to dy qun my in l vt liu.A. ngB. TnC. nhmD. C
ng v nhm*
Cu 63 : c im ca my bin p hn h quang l c c tnh ngoi U2 = f(I2)A.
nm ngangB. DcC. mmD. rt dc*
Cu 64 : chuyn my bin p 3 pha t t ni dy Y/Y -2 v Y/Y-12 phi i th
t pha bn dy qun th cp theo th t . a) c-b-a b) c-a-b c) b-a-c d)
a-c-b.
Cu 65 : My bin p phn phi c dy trung tnh cung cp in 1 pha phi c t
ni dy. a) Y/ -11 b) Y/Y-12 d) / -4 c)Y/ -7.
Cu 66 : My bin p in lc c cng dng. a) truyn ti v phn phi in nng *
b)dng cho cc mc ch chuyn dng c)dng cho o lng d) c a,b v c.
Cu 67 : Biu thc xc nh h s ti ca my bin p khi cc my bin p lm vic
song song l.a) * b) c) d)
cu 68 : Xc nh t ni dy sau : A . -11B. Y/Y-11C . -4D. Y/Y -4
Cu 69 : cho hnh sau : Xc nh t hp ni dy A . -11B. Y/Y-11C . -4D.
Y/Y -4
Cu 70 : Loi my bin p no sau y dng m my cc ng c khng ng b cng sut
ln l :A . my bin p t nguB. my bin p hn C . my bin p o lngD. My bin
p ba dy qun
Cu 71 : Trong iu kin cng in p ngn mch ca cc my bin p lm vic song
song th cho php in p ngn mch ca my bin p lch nhau :A . nh hn 10%B.
bng 20%C . ln hn 10%D. Ln hn 20 %
Cu 72 : u im no sau y khng phi l ca my bin p t ngu : A . ch to r
hnB . tn hao nh hnC . dng in lnD . st p nh
Cu 73 : Cho mt my bin p c dung lng Sm = 20000 Kv , U1= 126,8 kV
, U2 = 11 Kv , f=50 HZ , din tch tit din li thp l S = 3595 , mt t
thng B = 1,35 T .Tnh s vng dy qun s cp v th cp A . N1 =1177 vng ,
N2= 102 vng B . N1= 1177 vng , N2 = 100 vngC . N1 =102 vng , N2 =
1177 vngD. N1 = 100 vng , N2= 1177 vng
Cu 74 : My bin p ba pha u Y/Y -12 , c cng sut biu kin Sm = 180
VA ; = 6000/400 V ; dng in khng ti l % =6,4 ; tn hao khng ti P0 =
1000w ; in p ngn mch ; tn hao ngn mch Pn = 4000w. Ga s r1= , x1=Xc
nh gi tr Rm v Xm l :A . Rm= 272 , Xm= 3117 B. Rm= 200, Xm= 2237C .
Rm= 107 , Xm= 1289D. Rm= 340,Xm= 2389
Cu 75 : My bin p ba pha u Y/Y -12 , c cng sut biu kin Sm = 180
VA ; = 6000/400 V ; dng in khng ti l % =6,4 ; tn hao khng ti P0 =
1000w ; in p ngn mch ; tn hao ngn mch Pn = 4000w. Ga s r1= , x1=Xc
nh gi tr in p ngn mch ti in tr.Unr% A . 2,23B. 4,3C . 3,33D.
2,6
Cu 76 : Cho mt my bin p ba pha c s liu sau y : ; /=35000/6600 V;
; ; ; f= 50 Hz , u YXc nh tham s rn, xn l :A . B. C . D.
Cu 77 : Cho mt my bin p ba pha c s liu sau y : ; /=35000/6600 V;
; ; ; f= 50 Hz , u YXc nh gi tr A . B.C .D.
Cu 78 : : Cho mt my bin p ba pha c s liu sau y : ; /=35000/6600
V; ; ; ; f= 50 Hz , u Y, h s cng sut l 0.8 , Xc nh thay i in p th
cp A . 5,13B. 3,2C. 6.06 D. 7.08
Cu 79 : Cho mt my bin p ba pha c s liu sau y : ; /=35000/6600 V;
; ; ; f= 50 Hz , u Y, h s cng sut l 0.8 , Xc nh hiu sut ca ti nh mc
A . 98,34B . 35,67C . 57.65D. 37,89
Cu 80 : Cho mt my bin p ba pha c s liu sau y : ; /=35000/6600 V;
; ; ; f= 50 Hz , u Y, h s cng sut l 0.8 , Xc nh h s ti ng vi hiu
sut cc i A . 0.57B. 0.6C . 0.5D. 0,3
Cu 81 : cho ba my bin p cng t ni dy v t s bin i vi cc s liu : Sm
I = 180 Kva ; Sm II = 240 Kva ; Sm III = 320 Kva ; , ; .Tng cng sut
nh mc ca chng l : 740 Kva .Xc nh ti tng ti a khng m.b.a no b qu ti
bng bao nhiu ?A . 657,72 KvaB. 430,87 KVAC . 76,388 KVAD .675,44
Kva
Cu 82 : h s ti nh th no my bin p mang ti nh mc :A . nh hn 1 B.
bng 1 C . ln hn 1 D. Khng xc nh
Cu 83 : h s ti nh th no my bin p non ti :A . nh hn 1 B. bng 1 C
. ln hn 1 D. Khng xc nh
Cu 84 : Mt my bin p ba pha c cng sut nh mc 560 kVA . in p nh mc
22Kv/0,4 Kv. Ni dy tam gic , khi ti nh mc v h s cng sut ca ti l
=0,8 tr . Dng in nh mc th cp my bin p l ;A . 808,3B . 1010,4C .
1750D . 1400
Cu 85 : Mt ma bin p ba pha c cng sut nh mc l 630 KVA , in p nh
mc 22Kv/0,4 Kv, ni tam gic ,; I0=2% ; Un%= 4,5% , P0= 1300W ; Pn =
6500w ; h s cng sut ti =0,8.Dng in khng ti l :A . 0.33 AB .
0.0033AC . 0.57 AD . 18.76 A
Cu 86 : Mt ma bin p ba pha c cng sut nh mc l 630 KVA , in p nh
mc 22Kv/0,4 Kv, ni tam gic ,; I0=2% ; Un%= 4,5% , P0= 1300W ; Pn =
6500w ; h s cng sut ti =0,8.Khi ti bng ti nh mc th hiu sut my bin p
l :A . 98,47%B . 98.77%C . 74,55%D . 64,77%
Cu 87 : iu kin no sau y khng ni cc my bin p lm vic song song vi
nhau :A . cng t s bin pB. cng t ni dyC . cng in p nh mcD. Cng in p
ngn mch
Cu 88 : Nhc im no sau y khng phi ca my bin p t ngu l :A . in p
ngn mch nh nn dng in ngn mch tng i lnB . Khi vn hnh vi li in trung
tnh th m.b.a t ngu phi ni tC . yu cu cch in cao hn my bin p thngD .
in p ngn mch tng i ln gy ra khng an ton cho ngi s dng
Cu 89 : Gi Sm , , ln lt l cng sut nh mc , h s cng sut ca ti v h
s ti ca my bin p th cng sut tiu th ca my bin p l :A . SmB . SmC .
SmD . Sm
Cu 90 : Gi k h s ph ti , l h s cng sut ca ti bin p , Unr v Unx l
thnh phn tc dng v phn khng ca in p ngn mch ca my bin p th st p trn
my bin p l:A . )B . . )C . . )D . )
Cu 91 : Mt my bin p mt pha l tng c t s bin p 220/127V , thng s
dy qun s cp l Z1= 0,3 + j0,25 ; thng s dy qun th cp l Z2 = 0,1 +
j0,083 ; b qua tn hao st t v t haQui i tn tr th cp v s cp l :A .
0,3 + j0,25B . 0,1 +j0,083C . 0,25 + j0,3D . 0,0083+j0,1
Cu 92 : My bin p ba pha c cng sut nh mc l 560 Kva, U1/U2 :
6000/400V ; u YDng in khng ti l 2,468 A , P0=1970W , Pn= 7000W , H
s cng sut ca my lc khng ti l :A , 0,012B . 0.133C 0,076D .
0,044
Cu 93 : Trong my bin p ba pha Y-Y , , in tr ca dy qun s cp v th
cp l 0,01 , dng in s cp nh mc l 500A ., tn hao ng ca my khi y ti l
:A . 2500WB. 250WC . 750 WD. 7500W
Cu 94 : Trong my bin p ba pha , in tr mch t l 1000 ;dng in khng
ti l 0,4ATn hao trn mch t ca my l:A . 480wB. 250WC . 160WD.
750W
Cu 95 : My bin p c thng s cng sut nh mc l 5kva , in p s cp l
220v , 60Hz , in p h p l 110v , xc nh tn s bn cun dy th cp :A . 30
HzB . 120C . 60 HzD. 50 Hz
Cu 96 : My bin p ba pha 100KVA , 22KV/0,4KV, in p ngn mch thnh
phn l Unr=3% , Unx = 5% , my bin p cp in cho ti c =0,5 , , Tnh bin
thin in p (%):A . 0,3%B. 2,7%C . 0,7%D. 0,3%
Cu 97 : iu kin my bin p ba pha lm vic song song :A . cng t ni dy
, cng t s bin p , cngB. cng t ni dy , cng t s bin i in pgi tr in p
ngn mch C. cng t ni dy, gi tr in p ngn mch D. cng t s bin p , cng
gi tr in p ngn mch
Cu 98 : Trong my bin p ba pha YY, in tr mch t 1000 ohm , dng in
khng ti l 0,4 ATn hao mch t ca my l :A . 750wB. 480WC . 160WD.
250w
Cu 99 : My bin p mt pha c cng sut 100kva , in p s cp 4000v v in
p th cp l 220V, th nghim khng ti , cc dng c o s cp c cc gi tr sau :
I0=2A ; P0=2000W.tnh h s cng sut ca ti . A . 0,3 B. 0,25C . 0,5D.
0,8
Cu 100 : My bin p ba pha c s liu sau y : Sm =560KVA ;
U1/U2=35KV/6,6KV ; Un%=5;Pn =5Kw , f=50 Hz , t ni dy D/Y-11 . in p
ngn mch trn mt pha dy qun s cp ca my bin p l :A . 525vB . 1113VC .
1012VD. 1750V
Cu 101 : Khi ng ti vo my bin p s gy ra hin tng in p pha th cp l
:A . thay i theo tnh cht ca tiB. st pC . tng pD. Khng i
Cu 102 : Nu my bin p 3 pha c t ni dy l D/Y-1 th gc lch pha gia
in p s cp v th cp l :A . 330B. 111C .30D. 11
Cu 103 : My bin p mt pha c cng sut 100KVA, U1/U2=1600V/220V, th
nghim khng ti , cc dng c o s cp c gi tr sau : I0=2A; P0= 2000W .
tnh Z0?A . 2000B. 500C . 1000D . 800
Cu 104 : Cho my bin p 1 pha c cng sut nh mc 10KVA ; 400V/200V ;
50 Hz c s liu nh sau : th nghim khng ti , U0= 400v , I0=1,6A ,
P0=450WTh nghim ngn mch , Un=38v , In =25A ,Pn=600wXc nh thng s R0
, X0 :A . B. C. D.
Cu 105 : Cho my bin p 1 pha c cng sut nh mc 10KVA ; 400V/200V ;
50 Hz c s liu nh sau : th nghim khng ti , U0= 400v , I0=1,6A ,
P0=450WTh nghim ngn mch , Un=38v , In =25A ,Pn=600wXc nh hiu sut cc
i ng vi ti c h s cng sut l 0.8 trA . 0.88B. 0,65C . 0,35D. 0,78
Cu 107 : Cho my bin p 1 pha c cng sut nh mc 10KVA ; 400V/200V ;
50 Hz c s liu nh sau : th nghim khng ti , U0= 400v , I0=1,6A ,
P0=450WTh nghim ngn mch , Un=38v , In =25A ,Pn=600wTnh hiu sut bin
p lc mang ti 4,8Kw c HSCS = 0,6 smA . 0,85B. 0,78C . 0,65D.
0,35
CU 108 : Cho my bin p 1 pha c cng sut nh mc 10KVA ; 400V/200V ;
50 Hz c s liu nh sau : th nghim khng ti , U0= 400v , I0=1,6A ,
P0=450WTh nghim ngn mch , Un=38v , In =25A ,Pn=600wKhi hiu sut t cc
i vi ti mang cng sut l 6,28 kw .tnh h s cng sut ?A . 0,65B. 0,72C .
0,53D. 0,96
Cu 109 : Cho my bin p 1 pha c cng sut nh mc 10KVA ; 400V/200V ;
50 Hz c s liu nh sau : th nghim khng ti , U0= 400v , I0=1,6A ,
P0=450W , Z0= 2,4 +j3,2Th nghim ngn mch , Un=38v , In =25A ,Pn=600w
,Zn =0,96 +j1,1785Xc nh h s cng sut pha s cp : A . 0,6096 tr B.
0,32 trC . 0,8 sm D. 0,22 tr
Cu 110 : cho my bin p 1 pha c cng sut 50KVA ; 2400V/240V ; 50 Hz
c thng s mch tng ng qui i v s cp nh sau :=0,72 ; =0,92 ; R0= 30,86
K ; Xm= 4,46KXc nh tn hao khng ti ca bin p trong th nghim khng ti.A
. 186wB. 128WC . 343WD. 120W
Cu 111 : cho my bin p 1 pha c cng sut 50KVA ; 2400V/240V ; 50 Hz
c thng s mch tng ng qui i v s cp nh sau :=0,72 ; =0,92 ; Rm= 30,86
K ; Xm= 4,46KXc nh tn hao c ti ca bin p trong th nghim ngn mch A .
234wB. 625wC . 730wD. 546W
Cu 112 : cho my bin p 1 pha c cng sut 50KVA ; 2400V/240V ; 50 Hz
c thng s mch tng ng qui i v s cp nh sau :=0,72 ; =0,92 ; R0= 30,86
K ; Xm= 4,46KXc nh h s cng sut lc khng ti l :A . 0,14B. 0,32C .
0,65D. 0,43
Cu 113 : cho my bin p 1 pha c cng sut 50KVA ; 2400V/240V ; 50 Hz
c thng s mch tng ng qui i v s cp nh sau :=0,72 ; =0,92 ; R0= 30,86
K ; Xm= 4,46KXc nh h s ti lc bin p t hiu sut cc i .A . 0,345B .
0,55C . 0,65D . 0,23
Cu 114 : Cho my bin p 1 pha c cng sut nh mc l 150 KVA ;
2400V/240V ; 50 Hz. Khi mang ti ta c s liu nh sau : Ch 1 : ;
cos=0,8 tr ; Ch 2 : : ; cos=0,8 tr ; Tnh tn hao khng ti v tn hao
ngn mch l :A . P0=576WB. P0= 657w, Pn = 1202w Pn = 1574w C . P0=
234w, Pn = 1244wD. P0= 242W , Pn = 2342w
Cu 115 : Cho my bin p 1 pha c cng sut nh mc l 150 KVA ;
2400V/240V ; 50 Hz. Khi mang ti ta c s liu nh sau : Ch 1 : ;
cos=0,8 tr ; Ch 2 : : ; cos=0,8 tr ; Vi cng sut khng ti l 576w v
ngn mch l 1574w . Xc nh cng sut biu kin cp cho ti khi hiu sut ca ti
ca iA . 90.74 kvaB . 56.89 kvaC . 23.89 kvaD . 244.2kva
Cu 116 : Vt liu dn t trong my in l loi vt liu thp k thut c ch to
theo phng php no l ch yu :A . phng php cn ngui B. phng php cn nng C
. phng php cn ngui v cn nngD. Phng php cn bng nhit
Cu 117 : Vt liu cch in c nhit cho php l th thuc cp nhit no :A .
cp YB. cp HC . cp C. D. Cp A
Cu 118 : Vt liu cch in c nhit cho php l th thuc cp nhit no :A .
cp YB. cp HC . cp C. D. Cp A
Cu 119 : Vt liu cch in c nhit cho php l th thuc cp nhit no :A .
cp YB. cp HC . cp C. D. Cp A
Cu 120 : Ti sao khung dy camy bin p li thng c lmbng cc tm tn
silic dt mng v ghp st v cch in vi nhau?A. hin tng cm ng in t
xyra.B. gim tn hao in nng do dng in FuCo gy ra.*C. khng b oxi ha.D.
vn chuyn c gn nh
Cu 121 : My bin p c th dng bin i in pca nhngngun in no sau y?A.c
quyB.pinC.Ngun in xoay chiu*D.Tt c cc ngun trn
Cu 122: Mt my bin p c s vng cun s cp ln hn s vngca cun th cp. My
bin p ny c tc dng:A.Gim in p v cng dng in.B.ng in p v cng dng
in.C.Tng in p, gim cng dng in.D.Tng cng dng in, gim in p*
Cu 123 : Bin php no sau y thng c la chn gim haoph in nng khi
truyn ti?A.Tng tit din ca dy.B.Gim chiu di ca dy.C.Tng in p trc khi
truyn ti.*D.Chn loi dy c in tr sut nh
Cu 125 : Trong truyn ti in nng i xa, trc khi truyn ti, nutng in
p ln n ln th:A.Hao ph trn ng dy ti in s gim i n ln.B.Hao ph trn ng
dy ti in s gim i n2 ln.*C.Cng sut truyn ti tng n ln.D.Cng dng in
trn dy ti s tng n ln
Cu 126 : Tng tr ti tng ng qui v s cp ca 1 my bin p c cng sut
500KVA ; 2300/230V l Zn = 0,2 + j0,6 . My cung cp cng sut nh mc di
in p th cp th ti c HSCS = 0,8 tr.Tnh phn trm bin thin in p th cp ca
my bin p A . BC . D.
Cu 127 : Tng tr ti tng ng qui v s cp ca 1 my bin p c cng sut
500KVA ; 2300/230V l Zn = 0,2 + j0,6 . My cung cp cng sut nh mc di
in p th cp th ti c HSCS = 0,8 tr.Bit tn hao li thp l 2KW . Xc nh
hiu sut ca my bin p A . BC D
Cu 128 : Cho my bin p 1 pha c cng sut 6637KVA ; 35KV/10KV ;
Pn=53500W; Un%=8%.Xc nh in tr v in khng ngn mch .A . Rn =1,48 ;
Xn=14,69*B. Rn= 2,5; Xn =23,5C . Rn= 5,6; Xn = 6,2D. Rn= 7,9 ; Xn =
56
Cu 129 : Cho my bin p 1 pha c cng sut 6637KVA ; 35KV/10KV ;
Pn=53500W; Un%=8%.Gi s r1=r2 . Tnh in tr khng qui i ca dy qun th
cpA . 0,061ohm*B. 0,7645 ohmC . 0,987 ohm D. 0,322 Ohm
Cu 130 : cho my bin p mt pha c Sm = 75KVA ; 4,6KV/0,23KV ; f=50
Hz ; c s liu nh sau :Th nghim khng ti : U0 = 230 V ; I0= 13,04 A ;
P0=521WTh nghim c ti : Un= 160,8v ; In = 16,3 A ; Pn =1200WXc nh st
p phn trm khi my hot ng ti nh mc vi HSCS =0,75 trA . 3,25% *B.
4,5%C . 6,7%D. 5,2%
Cu 131 : My bin p mt pha c cng sut 150KVA ; 2400/240V; r1=0,2
x1= 0,45; r2=2m; x2= 4,5m .Xc nh cng sut ngn mch v cng sut khng ti
bit rng HSCS= 0,8 ; h s ti nh mc ; hiu sut 0,982A . Pn =1562,5w ;
P0 =637 w*B. Pn =1000w ; P0 = 234wC . Pn= 2352w ; P0= 435w D . Pn=
453w; P0= 637w
Cu 132 : My bin p ba pha c 11000/415V . bit in p mi vng dy l 4V
. v ni Y/Y . Tnh s vng dy s cp v th cp .A . *B. . C . . D . .
Cu 133 : : My bin p ba pha c 11000/415V . bit in p mi vng dy l
4V . v ni Tnh s vng dy s cp v th cp . A . . *B. . C . . D. .
Cu 134 : Cho my bin p ba pha c cng sut nh mc l160KVA ; 15KV/400V
; cng sut khng ti l : 460w ; cng sut ngn mch l 2350w ; Un%=4% ; t
ni dy YY-12 . cho bit R1= ; X1=2 . Tnh gi tr Rn v Xn l :A .
Rn=20,64 Ohm B. Rn=20,64 Ohm , Xn = 25,52 Ohm Xn= 52,31 Ohm C . Rn
= 32,54 Ohm D. Rn= 32,54 Ohm , Xn = 52,31 Ohm Xn = 23.45 Ohm
Cu 135 : Cho my bin p ba pha c cng sut nh mc l160KVA ; 15KV/400V
; cng sut khng ti l : 460w ; cng sut ngn mch l 2350w ; Un%=4% ; t
ni dy YY-12 . cho bit R1= ; X1=2 . Xc nh gi tr R1 v R2 :A .
R1=10,32 Ohm *B. R1 = 10,32 ; R2 = 4,35 mOHM R2 = 7.34 mOhmC . R1 =
8,65 D. Kt qu khc R2 = 6,65
Cu 136 : Cho my bin p ba pha c cng sut nh mc l160KVA ; 15KV/400V
; cng sut khng ti l : 460w ; cng sut ngn mch l 2350w ; Un%=4% ; t
ni dy YY-12 . cho bit R1= ; X1=2 . Xc nh hiu sut ca my bin p khi h
s ti l 0,75 v HSCS ca ti l 0,8A . 0,981*B. 0,76C . 0,23D. 0,45
Cu 137 : Cho my bin p ba pha c cng sut nh mc l160KVA ; 15KV/400V
; cng sut khng ti l : 460w ; cng sut ngn mch l 2350w ; Un%=4% ; t
ni dy YY-12 . cho bit R1= ; X1=2 . Xc nh thay i sut p phn trm khi h
s ti nh mc v HSCS = 0,8A . 3,4%B . 4,6%C . 3,4 %D . 5,9%
Cu 138 : Cho my bin p ba pha c cng sut nh mc l160KVA ; 15KV/400V
; cng sut khng ti l : 460w ; cng sut ngn mch l 2350w ; Un%=4% ; t
ni dy YY-12 . cho bit R1= ; X1=2 . Xc nh in p th cp khi khi h s ti
nh mc v HSCS = 0,8A . 386,4vB. 345VC . 234VD . 653V
Cu 139 : Cho my bin p ba pha t ni Y/D-11 c thng s nh mc cng sut
l 180KVA ; 10KV/0.23KV ; 50Hz ; P0=1.5KW ; I0%=5% ; Pn=4kw
;Un%=5.5% . tit din ngang li thp l 80cm^2 .Xc nh dng in khng ti ca
my bin p trn ?A . 0.519 AB . 0.678AC . 0,976AD . 1,121A
Cu 140 : Cho my bin p ba pha t ni Y/D-11 c thng s nh mc cng sut
l 180KVA ; 10KV/0.23KV ; 50Hz ; P0=1.5KW ; I0%=5% ; Pn=4kw
;Un%=5.5% . tit din ngang li thp l 80cm^2 .Xc nh hiu sut ca my bin
p kh h s ti t cc i v HSCS = 0.8A . 96.6%*B . 76,98%C . 12,45%D .
23.54%
Cu 141 : Mt my bin p ba pha u YY-12 c cng sut nh mc l 20KVA ;
6kv/0,4kv; f=50Hz ; Pn =0.6kw ; Un%=5.5%Xc nh dng in ngn mch ca ti
Un :A . V*B. 190 VC . V D. 90V
Cu 142 : Mt my bin p ba pha u YY-12 c cng sut nh mc l 20KVA ;
6kv/0,4kv; f=50Hz ; Pn =0.6kw ; Un%=5.5%Xc nh thnh phn tc dng ca
bin p Unr :A . 104 V *B. 104C . D . 80
Cu 143 : Mt my bin p ba pha u YY-12 c cng sut nh mc l 20KVA ;
6kv/0,4kv; f=50Hz ; Pn =0.6kw ; Un%=5.5%Xc nh in cm ngn mch Xn :A .
83 *B . 45 C . 76 D . 102
Cu 144 : Mt my bin p ba pha u YY-12 c cng sut nh mc l 20KVA ;
6kv/0,4kv; f=50Hz ; Pn =0.6kw ; Un%=5.5%Xc nh h s cng sut ca ti A .
0.55*B . 0,35C . 0,23D . 0,65
Cu 145 : Mt my bin p ba pha u YY-12 c cng sut nh mc l 20KVA ;
6kv/0,4kv; f=50Hz ; Pn =0.6kw ; Un%=5.5%Tnh thay i in p phn trm khi
h s ti nh mc v HSCS = 0,8( ti cm )A . 5.16%*B . 3.15%C . 2,3%D .
4.8%
Cu 146 : Mt my bin p ba pha u YY-12 c cng sut nh mc l 20KVA ;
6kv/0,4kv; f=50Hz ; Pn =0.6kw ; Un%=5.5%Bit P0= 0.18kw ; tnh hiu
sut ca my khi ti nh mc A . 95.35%*B . 87,65%C . 54.52%D .
67,87%
Cu 147 : My in quay gm c b phn kt cu l :A . mch t v dy qun *B.
stator v rotorC . phn tnh v phn quay D. Li thp .
Cu 148 : Mch t my in quay c cu to bi :A . phn tnh v phn quayB.
stator v rotorC . c A & B ng*D. C A & B sai
Cu 149 : Tn silic c ghp trong k thut in trong my in quay nhm mc
ch l:A . gim tn hao dng xoy*B . gim t thng trong mch C . gim tn hao
dy qun D . tt c sai
Cu 150 : Nguyn l lm vic ca my in quay da vo :A . nh lut sc in ng
v lc in t*B . nh lut cm ng in tC . nh lut in t v in ngD . nh lut in
t v t in
Cu 151 : Cu to my in khng ng b gm :A . phn tnh v phn ngB. stato
va rotoC . li thp D. C A & B .*
Cu 152 : My in khng ng b l loi my in :A .* lm vic theo nguyn l
cm ng in t c tc quay ca roto khc vi tc quay ca t trngB . lm vic
theo nguyn l cm ng in t c tc quay ca roto nh hn vi tc quay ca t
trngC . lm vic theo nguyn l cm ng in t c tc quay ca roto ln hn vi
tc quay ca t trngD . lm vic theo nguyn l cm ng in t c tc quay ca
roto bng vi tc quay ca t trng
Cu 153 : Vn tc ca t trng quay ph thuc vo :A . tn s v s cp cc *B.
tn s v s ccC . tn s D. Th t pha ca ngun in
Cu 154 : Dy qun rto ca my in khng ng b rto dy qun xoay chiu 3
pha c cu to.A. dy qun 3 pha B. ni ngn mch hai u cc cun dy C. ni vo
chi than bn ngoi* D. ni vi in tr ph
Cu 155 : : Roto lng sc ca my in khng ng b rto dy qun xoay chiu 3
pha c cu to:A. dy qun 3 pha B. ni ngn mch hai u cc cun dy *C. ni vo
chi than bn ngoi D. ni vi in tr ph
Cu 156 : Biu thc xc nh tc ca CKB xoay chiu l.A. A. C. *D.
Cu 157 : CKB xoay chiu 3 pha c tc ca t trng nhn t li n = 750
vng/ pht c.A. 2p= 8B. 2p = 4C. 2p=6D. 2p =2
Cu 158 : . trng thi m my ca CKB, rto ng yn, h s trt l .A. s =
0B. s = 0.5C. s = 1*D. s = 1.5
Cu 159 : ng c KB c cng sut trn u trc l Pm = 90W, hiu sut ca C l
= 97% . Cng sut nh mc m ng c tiu th.A. P1m = 90WB. P1m = 87.3WC.
P1m = 92.8WD. P1m = 85.5W
Cu 160 : m my c CKB lm vic vi mt mmen ti l Mc th.A. Mmm <
McB. Mmm = McC. Mmm > McD. Mmm Mc 7
Cu 161 : Yu cu m my i vi CKB.A. Mmm ln, Imm nhB. Mmm nh, Imm
nhC. Mmm ln, Imm lnD. Mmm nh, Imm ln
Cu 162 : Khi m my CKB bng in khng nu in p a vo ng c gim k ln th
Mmen m my.A. gim kB. gimC. gim k2D. gim 1/k
Cu 163 : c im ca MKB l h s cng sut .A. cos cao B. cos thp* C.
cor = 0 D. cos = 1
Cu 164 : M my CKB ~3 bng phng php i ni Y/ c s dng cho ng c.A. Ch
lm vic bnh thng ch A. Ch lm vic bnh thng ch YC. C a v bD. Khng c
phng n no ng
Cu 165 : . Khi iu chnh tc CKB xoay chiu, nu in p gim t U1 = U1m
, U2 = 0.85 Um , U3=0.7 Um th h s trt tng ng s1, s2, s3, s c quan
h.A. s2 > s1 >s3 B. s1 > s3 >s2 C. s1 > s2 >s3D.
s3 > s2 >s1
Cu 166 : B dy qun mt lp ca CKB 3 pha c thng s Z= 24, m=3, 2p=4 s
xc nh c s rnh ca 1 pha di 1 cc.A. q=3B. q=4C. q= 2D. q= 1
Cu 167 : Vi C KB rto dy qun khi a in tr ph vo dy qun rto, nu Rp
tng th .A. tc khng i B. tc tng C. tc gim D. khng c p n ng trong cc
p n trn
Cu 168 : Khi m my CKB ~3 bng phng php i ni Y/ nu dng in m my gim
3 ln th mmen m my gim. A. B. 9C. 3D. 1/
Cu 169 : Bin php iu chnh tc CKB xoay chiu rto lng sc l .A. gim
U1 , thay i p , r2 , fB. tng U1 C. thay i p , r2D. thay i f
Cu 170 : Khi s = 0 th tc bng bao nhiu.A. n = n1B. n > n1C. n
=0D. n =1
Cu 171 : . Mt CKB 3 pha dy qun stato ni hnh in p li 220v, f =
50Hz, 2p =4, s =0,053. thi tc A. n = 1420v/phB. n = 1480v/phC. n =
1450v/phD. n = 1500v/ph
Cu 172 : . Cho ng c KB ba pha c cng sut nh mc c thng s l P=
5,5KW, s =0,053, f = 50 hz, 2p = 4. M quay ng c l.A. 36.9NmB.
42.9NmC. 32.4NmD. 48Nm
Cu 173 : Cho my in KB ba pha 2p =6, f=50Hz. Dy qun rto h mch o c
in p cm ng mi pha l 110v. Bit n = 980v/ph. Tnh E2sA. 2,4vB. 2vC.
2,2vD. 2,8v
Cu 174 : Khi my in KB lm vic ch my pht th cng sut c nh th noA.
Pc > 0B. Pc < 0C. Pc = 0D. khng c p n ng trong cc p n trn
Cu 175 : Khi my in KB lm vic ch hm th cng sut c nh th no?A. Pht
cng sut ra li B. Pc = 0C. Ly cng sut t li voD. khng c p n ng trong
cc p n trn
Cu 176 : . Quan h gia m men Max v in tr rtoA. Mmax ph thuc in tr
rtoB. Mmax khng ph thuc in tr rto *C. T l nghch vi in tr rtoD. khng
c p n ng trong cc p n trn
Cu 177 : Mt ng c in khng ng b rto lng sc c Pm = 11,9Kw, pcu1 =
745W, pcu2 = 480W, pFe = 235W, pc = 180W, pf = 60W. Tnh PtA. Pt =
12620WB. Pt = 12855WC. Pt = 10000WD. Pt = 13600W
Cu 178 : Quan h gia mmen ca ng c in ng b v in p li in l.A. M B.
M U2 * C. M UD. M 1/U
Cu 179 : Trong trng hp no sau y, ng c khng ng b s thc hin hm ti
sinh:A. Dng mt ng c s cp quay ng c KB vi tc ln hn tc ng bB. Dng mt
ng c s cp quay ng c KB vi tc nh hn tc ng bC. Dng mt ng c s cp quay
ng c KB vi tc bng hn tc ng bD. Khng c p n no ng
Cu 180 : Qu trnh m my ng c in ng b theo phng php khng ng b c thc
hin.A. Dy qun kch t ni vi ngun kch t , ng in ni dy qun stato vi li
inB. Dy qun kch t ni tt qua in tr RT ,ng in ni dy qun stato vi li
inC. Dy qun kch t ni ngn mch, dy qun stato ni vi li inD. Dy qun kch
t h mch, dy qun stato ni vi li in
Cu 181 : Sc in ng phn ng ca M mt chiu c xc nh chiu theo quy tc
a) Bn tay tri b) Bn tay phi c) inh c
cu 182 : .Khi chi than t trn ng trung tnh hnh hc, s xut hin ng
trung tnh vt l, nu mch t khng bo ho th t thng tng:a.Khng ic. gim i
b.Tng ln
Cu 183 : ch ng c trong my pht in khng ng b , h s trt (s) c gi tr
nm trong phm vi :A . 0
