Trc nghim mn Kh c in h p cui kCu 1 : kh c in c phn loi theo cng dng l :A . kh c in cao th B. kh c in dng trong mch in xoay chiu v mt chiu C . kh c in dng ng ct,bo v li D. Kh c in h th .in,mch in

Cu 2 : kh c in c phn loi theo dng in gm cc kh c in sau :A . ng ngt,bo v mch in B. xoay chiu ,mt chiuC . c cu t in , in t D. Cao p, trung p, h p

Cu 3: kh c in c phn loi theo nguyn l lm vic l : A . in t ,cm ng nhit ,c tip im B. t cm, in t, r leC . t in, cm ng, tip im D. T trng, nam chm v nh cu

Cu 4 : kh c in phn loi theo in p gm cc kh c in sau A . cao p , trung p ,h p B. c cu in t ,t in C . xoay chiu ,mt chiu D. ng ct v bo v mch in

Cu 5 : khi phn loi kh c in theo in p nu l kh c h thA . U= 10000VB. U10000VD. U>100KV

Cu 6 : kh c in cao th c ch to dng in p nh mc :A . B. 1000V

Cu 7 : tnh s n nh lc in ng ca kh c in , ta s dng :A . dng in khi ng tnh tonB. dng in ngn mch tnh tonC . dng in nh mc tnh tonD. Dng in s c tnh ton

Cu 8 : kh c in n nh ca lc in ng th vic tnh ton lc in ng phi tha mn iu kin :A . tnh theo dng nh mcB. tnh theo dng s c qu tiC . tnh theo dng in ca hin tngD. Tnh theo in pngn mch

Cu 9: kh c in lm vic c lu di th :A . nhit pht nng ca kh c in phi ln hn nhit cho php lm vic an ton lu di.B . nhit pht nng ca kh c in phi nh hn nhit cho php lm vic an ton lu di .C. nhit pht nng ca kh c in phi bng nhit cho php lm vic an ton lu di .D . nhit pht nng ca kh c in phi nh hn hoc bng nhit cho php lm vic an ton lu di .

Cu 10 : tn tht trong kh c in ph thuc vo :A . vt liu to nn kh c in ,hnh dng kh c inB . vt liu to nn kh c in, kich thc kh c inC. vt liu to nn kh c in, kich thc kh c in ,hnh dng kh c inD . kich thc kh c in, hnh dng kh c in

Cu 10* : Tc hi ca h quang in :A . ko di thi gian ng ctB. gy ra ngn mch gia cc phaC . lm hng b mt tip xc in D. Gy ha hon

Cu 11* : Qa trnh pht sinh h quang gm nhng giai on :A . hin tng pht x in t nhitB. hin tng ti hpC . hin tng pht x in tD. Hin tng khuch tn

Cu 11**: Qa trnh dp tt h quang in gm bao nhiu hin tng:A .1B. 2C .3 D. 4

Cu 11***: Trong mng in cao p . dp tt h quang th s dng phng php A . vt liu t sinh kh B. chia nh h quangC . du bin pD. Tng nhanh khong cch

Cu * : dp h quang in trong mng in cao p th ta khng s dng phng php :A . bng kh nnB. vt liu t sinh khC . du bin p kt hp chia nh h quang D. Ko di c kh

Cu +: i thit b cao p , c th dng ng hoc bc thun khit dp tt h quang khng :A cB . khng

Cu 11: h quang in l hin tng :A . phng in trong cht kh, lng hoc bay hiB. mt dng in lnC . in p ri trn catotD. Tt c cc trn

Cu 12: qu trnh pht sinh h quang in c dng :A . c cu in t,t in B. in t, nhit , ion haC . t trng ,in tD. in trng , lc ht

Cu 13 : cu no sau y khng phi l nguyn tc dp tt h quang in xoay chiu :A . ko di h quangB . chia h quang thnh nhiu ct nhC . dng nng lng ngun ngoi hoc h quang t sinh nng lng dp ttD . tng nhit h quang.

Cu 14: phng php no sau y khng c s dng dp tt h quang in :A . chia h quang thnh nhiu on nhB. mc in tr song song vi hai tip im sinh h quangC . mc in tr ni tip vi hai tip im sinhD. Ko di h quangra h quang

Cu 15 : phng php no dp c h quang in h p :A . phn chia h quang thnh nhiu on nhB.ko di h quangC . mc in tr ni tip D. Tng nhit h quang

Cu 16 : phng php no sau y khng dp h quang in cao p :A . dp h quang bng kh nn kt hp phn chia h quangB . dp h quang bng kh nn C . dp h quang trong chn khng D. ko di h quang .

Cu 17 : hn ch hin tng qu in p h quang in mt chiu th ngi ta phi : A . dng thm in tr,t in v in tr song song B. mc ni tip vi ph ti vi ph tiC . tng in p lnD . chia nh h quang in

Cu 18: Ti no sau y th d dp h quang in xoay chiu : A . ti thun trB. ti thun dungC . ti thun cmD. Ti thun khng

Cu 19: Qa trnh dp tt h quang in xoay chiu ph thuc vo :A . tng quan gia in p chc thng v in p phc hiB . tng quan gia in p chc thng v in p xoay chiuC . tng quan gia in p gia chng

Cu 20: Trong kiu thit b dp h quang, kiu na kn c dng in gii hn ct :A . ln hn 50A B. khng qu 50 mAC . khng qu 50 kAD. Nh hn 5A

Cu 21: Trong kiu thit b dp h quang, kiu h c dng in gii hn ct :A . nh hn 50A v in p nh di 1000VB. nh hn 50KA hoc in p nh di 1000VC . khng qu 50 A hoc in p ln 1000VD. Ln hn 50 KA hoc in p ln 1000V

Cu 22: Trong kh c in theo lin kt tip xc c dng no :A . tip xc ng m, tip xc im, tip xc ngB . tip xc im, tip xc ng, tip xc mtC . tip xc ng m, tip xc im, tip xc trtD . tip xc c nh, tip xc ng m, tip xc im

Cu 23: Trong kh c in theo b mt tip xc c 3 dng :A . tip xc ng m, tip xc im, tip xc ngB . tip xc im, tip xc ng, tip xc mtC . tip xc ng m, tip xc im, tip xc trtD . tip xc c nh, tip xc ng m, tip xc im

Cu 24: Tip xc ng ngt mch in c gi l :A . tip xc ng mB. tip xc trtC . tip xc khng c nhD.tip xc c nh

Cu 24 * Tip xc in l niA . l ni gp g gia hai vt mang inB . l ni c s ma st lnC . l ni dng in i t vt dn ny sang vt dn khcD . l ni gp g gia hai hay nhiu vt dng in i t vt dn ny sang vt dn khc.

Cu 25* : Tip xc gia tip im tnh v tip im ng thuc loi tip xc no:A . tip xc c nhB. tip xc ng mC . tip xc trt D. Tip xc ng ct

Cu 26*: Kt cu tip im kiu no c phn chuyn ng thng :A . tip im kiu cu B. tip im kiu daoC . tip im kiu congsonD. Tip im kiu ngn

Cu 27* : Kt cu tip im kiu no c phn chuyn ng quay : A . tip im kiu cu B. tip im kiu daoC . tip im kiu congsonD. Tip im kiu ng

Cu 25: Cc tip im c ni vi cc chi tit dn dng nh : thanh ci, cp in...... c gi l :A . tip xc dng mB. tip xc trtC . tip xc khng c nhD. Tip xc c nh

Cu 26: in tr tip xc gia hai vt dn c xc nh bng biu thc :A . R=B. R=C. R= D. R=

Cu 27 : Khi lp t cc kh c in vo trong mch in, cc tip xc in phi tha yu cu no:A . tip xc phi chc chn , m bo n nh nhitB . m bo n nh nhit, m bo n nh ngC . m bo n nh ng, phi chc chn.D . phi chc chn, m bo n nh nhit, m bo n nh ng

Cu 28: Cho hnh nh sau : tip im kiu g ? A . tip im kiu congsonB. tip im kiu hnh nnC . tip im kiu cuD. Tip im kiu dao

Cu 29 : Loi tip im no thng dng trong contactor :A . tip im kiu cu B. tip im kiu daoC . tip im kiu congsonD. Tip im kiu nn

Cu 30 : : Loi tip im no thng dng trong CB nhiu nht :A . tip im kiu cu B. tip im kiu daoC . tip im kiu congsonD. Tip im kiu ngn

Cu 30* : Cc loi tip im thng dng trong thit b h p :A . tip im kiu cu B. tip im kiu daoC . tip im kiu nmD. Tip im kiu ngn

Cu 31: Kh c in no sau y c s dng bo v mch in A . R le, aptomat, cng tc tB. R le , cng tc t, cu chC . cng tc t, cu ch, aptomatD. R le, aptomat, cu ch

Cu 32 : Lc ht in t ca nam chm in , ngi ta dng phng php : A . phng php maxwell v ampereB. phng php cn bng nng lngC . phng php maxwell v cn bng nng lngD. Phng php ampere

Cu 32: Nam chm in DC c c im no sau y:A . dng in chy trong cun dy s sinh ra t trng B. ng ct nam chm in lm xut hin h quang inC . to ra lc ht D . to ra dng in ln

Cu 33: Tnh lc ht in t theo cng thc maxwell no sau y :A . F =B. F = 4,06 C . c a v bD. F= K.M

Cu 34: Cu dao ( dao cch ly) kh c in dng :A . ng mch bng tay B. ngt mch in bng tay C . iu khin mch inD. ng ngt mch in bng tay

Cu 35: Khi phn loi theo kt cu , cu dao chia lm cc loi :A . mt cc, hai cc, ba cc, hoc bn ccB. mt cc, ba cc, bn cc hoc nhiu cc C . hai cc ,ba cc, bn cc hoc nhiu ccD. Mt cc, hai cc ,ba cc,hoc nhiu cc

Cu 36: Khi chn cu dao , ta phi tha mn hai iu kin sau:A . v B. v C . v D. v

Cu 37: Cho hnh nh hnh v . k hiu ny l g

A . cu daoB. cu chC . cng tcD. CB

Cu 38 : Theo chc nng , nt nhn c phn ra lm :A . nt nhn thng ng , nt nhn thng mB. nt nhn n v nt kpC . nt nhn h p, nt nhn cao pD. Nt nhn mt chiu v xoay chiu

Cu 39 : Tr s dng in nh mc ca nt nhn thng c gi tr :A . B.C. D. >5A

Cu 40: Tr s in p nh mc ca nt nhn thng c gi tr:A . 1000VC. D.

Cu 41: Tr s dng in nh mc ca cng tc thng c gi tr :A. 100 A

Cu 42: Tr s in p nh mc ca cng tc thng c gi tr:A .B. 10 KV

Cu 43: Theo trng thi hot ng , ngi ta phn nt nhn thnh :A . nt nhn thng ng , nt nhn thng mB. nt nhn n v nt kpC . nt nhn h p, nt nhn cao pD. Nt nhn mt chiu v xoay chiu

Cu 44: Cu to nt nhn gm :A . h thng l xo, h thng dp h quang,h thng tip im h, thng ng v v bo v.B . . h thng l xo, h thng dp h quang,h thng tip im h.C . . h thng l xo, h thng dp h quang,h thng tip im hD . . h thng l xo, h thng tip im h, thng ng v v bo v.

Cu 45: Trong cu dao ngi ta thng dng lm thm li dao ph :A .m bo an ton, chng chy n thit b, dp h quang nhanhB .m bo an tonC . dp h quang nhanh.D . chng chy n thit b

Cu 46: iu kin cng tc bnh thng ca kh c in h p th nhit mi trngxung quanh c qui nh :A . nhit khng kh cao nht khng vt qu + 35B . nhit khng kh cao nht khng vt qu + 40C . . nhit khng kh cao nht khng vt qu +45D . . nhit khng kh cao nht khng di

Cu 47 : Cng tc chuyn mch l kh c in dng :A . ng ngt chuyn i mch in, i ni cho ng cB . i ni cho ng cC . ng ngt chuyn i mch inD . iu khin t ng ha hnh trnh lm vic ca mch in

Cu 48 : Cho 1 ng c khng ng b ba pha c thng s nh mc sau : . Cng sut nh mc : = 10 HP . in p nh mc : = 380 V . H s cng sut = 0.8 . H s m my ca ng c = 5Cu dao s dng ng ngt cho ng c trn phi c dng in nh mc ti thiu l:A . 24,6 AB. 123 AC . 142 AD . 71 A

Cu 49 : i vi cng tc, in p th xuyn thng cc im cn cch in l : A . 2000v B. 1500 VC. 1000 VD. 500 V

Cu 50: i vi cng tc , in tr cch in khi yu cu th cch in l :A . B. C .> 2 M@D. < 2 M@

Cu 51: Cu no sau y khng phi l tiu ch la chn v kim tra dao ch ly :A . kim tra n nh ng v n nh nhit B. cng sut ct nh mcC . dng in nh mcD. in p nh mc

Cu 52 : Dao cch ly cao p ( >1000V) khi phn loi theo yu cu s dng, dao cch ly c loi :A . dao cch ly mt pha, ba pha.B. Dao cch ly trong nh , ngoi triC . dao cch ly hai pha, ba phaD. Dao cch ly mt pha, dao cch ly hai

Cu 53: Th xuyn thng ca vic kim tra cht lng cng tc phi :A . thng c lp trong mch in iu khinB . loi tip im thng hC . loi tip im thng ng

Cu 54: Theo cng dng , ngi ta chia cng tc theo cc loi : A . cng tc thng dngB. cng tc chuyn mch C . cng tc nt nhn D. Cng tc hnh trnh

Cu 55 : Cu ch l loi kh c bo v :A .qu tiB. tng pC . ngn mch D. St p

Cu 56: c tuyn ca cu ch l:A . vn-giyB. cng sut v ampereC . vn- ampereD. Ampere- giy

Cu 57 : c tnh A-s ca cu ch phi:A . cao hn c tnh A-s ca i tng cn c bo vB .bng c tnh A-s ca i tng cn c bo vC . thp hn c tnh A-s ca i tng cn c bo vD . thp hn hoc bng c tnh A-s ca i tng cn c bo v

Cu 58 : c tnh c bn ca cu ch ph thuc vo thi gian :A . bt u s c B. tin h quangC . chy t vi dng in chy quaD. Sinh h quang

Cu 59 : Phn t ngt mch ca cu ch thng c in tr sut :A . rt nhB. nhC . rt lnD. Ln

Cu 60 : : Cu ch l loi kh c bo v :A . tng p v st pB. st p v ngn mchC . qu ti v st p D. Ngn mch v qu ti

Cu 61 : Theo tiu chun IEC 60269 , loi cu ch no thng dng hin nay :A . cu ch loi gB. cu ch loi aC . cu ch loi mD. Cu ch loi n

Cu 62 : Loi cu ch thng dng hin nay : A . gG, aM,GuB. gM, gm,gsC . gG, Gm,aMD.gG, aM, gs

Cu 63 : Thi gian khi c dng in ln cho cu ch chy ti khi bt du c h quang l :A . thi gian tc ng B. thi gian tin h quangC . thi gian h quangD. Thi gian nng chy

Cu 64 : Thi gian khi mi bt u c h quang cho n khi h quang tt hn l: A . thi gian tc ng B. thi gian tin h quangC . thi gian h quangD. Thi gian nng chy

Cu 65: Tr s m ti cu ch c th dn trong mt thi gian n nh l :A . dng khng nng chy qui cB. dng nng chy qui cC . dng in nh mcD. in p nh mc

Cu 66 : Tr s m ti cu ch s tc ng trong mt thi gian n nh l :A . dng khng nng chy qui cB. dng nng chy qui cC . dng in nh mcD. in p nh mc

Cu 67: Theo tiu chun IEC 60269 ,cu ch c dng in nh mc l , dng chy qui c c gi tr l A . =19 AB. . = 20 AC . . = 21 AD. . = 15 A

Cu 68: : Theo tiu chun IEC 60269 ,cu ch c dng in nh mc l , dng khng nng chy qui c c gi tr l:A . =19 AB. . = 20 AC . . = 21 AD. . = 15 A

Cu 69: Theo tiu chun IEC 60269 ,cu ch c dng in nh mc l , dng nng chy qui c c gi tr l:A . =9 AB. . = 8.4 AC . . = 21 AD. . = 15 A

Cu 70: Theo tiu chun IEC 60269 ,cu ch c dng in nh mc l , dng nng chy qui c c gi tr l:A . =160 AB. . = 125AC . . = 150 AD. . = 210 A

Cu 71: Cu ch cao p ( >1000v) m dy chy t trong mi trng chn khng gi l :A . cu ch ngB. cu ch hn dngC . cu ch chn khngD. Cu ch t ri(FCO)

Cu 72: Phn t ngt mch ca cu ch thng c in tr sut :A . lnB. rt nhC . nhD. Rt nh

Cu 73 : Cu ch loi G bo v s c khi:A . qu ti v ngn mch trn ph ti B.qu ti v ngn mch trn tiC . qu ti hay ngn mch trn ph tiD. Ngn mch trn ti.

Cu 74: Cu ch loi A bo v s c khi:A . qu ti v ngn mch trn ph ti B.qu ti v ngn mch trn tiC . qu ti hay ngn mch trn ph tiD. Ngn mch trn ti

Cu 75: c tuyn Ampe- giy ca cu ch loi a:A . nm xa trc thi gian va cao hn c tuyn ampe- giay ca cu ch loi gB. . nm gn trc thi gian va cao hn c tuyn ampe- giay ca cu ch loi gC . nm gn trc thi gian va thp hn c tuyn ampe- giay ca cu ch loi gD . nm xa trc thi gian va thp hn c tuyn ampe- giay ca cu ch loi g

Cu 76: Chn cu ch dng bo v cho mch gm cc thit b sau : 10 b n , mi b c cng sut sau: P= 10 w, ; A . 1,8AB. 5,3 AC . 3,2 AD. 2,3 A

Cu 77 : Chn cu ch dng bo v cho mch gm cc thit b sau : 10 qut , mi qut c cng sut 60 w, , ; A . 1,8 AB. 2.3 AC . 3 AD. 5,3 A

Cu 78 : Chn cu ch dng bo v cho 1 my bm c cng sut 0,5 HP, , ; , A . 2,1 AB. 1,2 AC . 2,4 AD. 3,2 A

Cu 79 : Chn cu ch bo v cho mch c 2 ng c 3 pha, c cc thng s sau: c=2,5, ng c 1 : ; ; ; ng c 2 : ; ; ; A . 7.1 AB. 10 AC . 57,1 A D. 22.8 A

Cu 80 : Chn cu ch bo v cho mch c 3 ng c 3 pha, c cc thng s sau: c=2,5ng c 1 : ; ; ; ng c 2 : ; ; ; ng c 3: ; ; ; 3A . 7,1 AB. 23.9 AC . 10 AD. 57,1 A

Cu 81: : Chn cu ch bo v cho mch c 2 ng c 3 pha, c cc thng s sau: c=2,5, ng c 1 : ; ; ; ng c 2 : ; ; ; A . 40.7 AB. 8.4 AD. 7.1 AC. 15.5 A

Cu 82 : Tnh dng in nh mc ca cu ch dng bo v cho mch gm cc thit b sau: 10 b n , mi b c cng sut : 40 w; ; 10 qut, mi qut c cng sut : 60 w ; ; A . 2,3 AB. 3,2 AC . 5,3 A D . 3,4 A

Cu 83 : : Tnh dng in nh mc ca cu ch dng bo v cho mch gm cc thit b sau: 10 b n , mi b c cng sut : 40 w; ; A . 2,3 AB. 1,8 AC . 5,3 A D . 3,4 A

Cu 84: Tnh dng in nh mc ca cu ch dng bo v cho mch gm cc thit b sau: 10 qut, mi qut c cng sut : 60 w ; ; A . 2,3 AB. 3,2 AC . 5,3 A D . 3,4 A

Cu 85 : Khi c s c ngn mch , cu ch tc ng phi c iu kin :A . tnh phn dng B. tnh phn p C . tnh ngt mch chn lc D. Tnh chy nt

Cu 86 : Trong qu trnh chn lc cu ch , c dng in nh mc , cu ch c th ngt mch chn lc th phi :A . dng in thng ngun (ln hn hoc bng 1,6 B . dng in thng ngun (ln hn 1,6 C dng in thng ngun bng 1,6 D . dng in thng ngun (nh hn hoc bng 1,6

Cu 87 : Cho hnh sau: y l k hiu ca loi no :A . CBB. cu daoC . cu chD. RCD

Cu 88 : Cu ch c th chia thnh my loi c bn :A . 2 B. 3C . 4 D. 5

Cu 89 : iu kin m bo ct chn lc ca cu ch :A . c tnh vn hnh ln hn c tnh tin h quangB . c tnh vn hnh nh hn c tnh tin h quangC . c tnh vn hnh bng c tnh tin h quangD . c tnh vn hnh bng hoc ln hnc tnh tin h quang

Cu 90 : Ch lm vic nh mc ca CB l ch :A . lm vic ngn hn B. lm vic ngn hn lp liC . lm vic ngn hn v di hnD. Lm vic di hn

Cu 91 : nng cao tnh n nh nhit v in ng ca cc thit b , hn ch s ph hoi do dng in ngn mch gy ra, CB phi c :A . thi gian ct t trung bnh cho n ln B. thi gian ct trung bnhC . thi gian ct nh D. Thi gian ct ln

Cu 92 : CB thng c ch to c :A . mt hoc hai cp tip imB. hai hoc ba cp tip imC . ba hoc bn cp tip imD. Mt hoc ba cp tip im

Cu 93 : Khi CB ng mch : A . tip im h quang ng trc, tip theo la tip im ph,sau cng l tip im chnhB .tip im ph ng trc , tip theo l tip im chnh , sau cng l tip im h quangC . tip im chnh ng trc ,tip theo l tip im ph, sau l tip im h quangD . tip im h quang ng trc , tip theo l tip im chnh, tip im ph

Cu 94 : Khi CB ct mch : A . tip im h quang ct trc, tip theo la tip im ph,sau cng l tip im chnhB .tip im ph ct trc , tip theo l tip im chnh , sau cng l tip im h quangC . tip im chnh ct trc ,tip theo l tip im ph, sau l tip im h quangD . tip im h quang ct trc , tip theo l tip im chnh, tip im ph

Cu 95 : i vi truyn ng ct CB, iu khin bng tay c thc hin vi cc CB c dng in nh mc :A . ln hn 60 A B . khng ln hn 600AC . khng ln hn 60 AD. Ln hn 600A

Cu 96: i vi truyn ng ct CB, iu khin bng in t ( nam chm in) c thc hin vi dng in nh mc :A . ln hn 10000AB. bng 1000AC . bng 10000AD. Ln hn 1000A

Cu 97 : Mc bo v ca CB s tc ng khi mch in gp s c :A . ngn mchB. qu dng v ngn mchC . st p D. Qu dng

Cu 98 : Khi lm mc bo v qu dng in trong CB , ngi ta thng dng h thng :A . in t v r le nhit B. in ng v r le nhit C . in t v in ng D. T in v r le nhit

Cu 99 : Mc bo v qu dng in kiu in t trong CB, c cun dy mc :A . ni tip vi mch chnh B. ni tip vi mch phC . song song mch phD. Song song mch chnh

Cu 100: Mc bo v qu dng in kiu in t trong CB, c cun dy c qun :A . tit din dy ln v nhiu vngB. tit din dy nh v t vng C . tit din dy nh v nhiu vngD. Tit din dy ln v t vng

Cu 101 : Mc bo v qu dng in kiu r le nhit trong CB, c phn t pht nng mc :A . ni tip vi mch ph B. ni tip mch chnhC .song song mch phu D. Song song mch chnh

Cu 102 : Mc bo v st p kiu in t trong CB , c cun dy mc :A . ni tip vi mch ph B. ni tip mch chnhC .song song mch phu D. Song song mch chnh

Cu 103 : : Mc bo v st p kiu in t trong CB , c cun dy c qun :A . tit din dy ln v nhiu vngB. tit din dy nh v t vng C . tit din dy nh v nhiu vngD. Tit din dy ln v t vng

Cu 104 : Phn loi theo kt cu , ngi ta chia CB ra lm cc loi : A . mt cc, ba cc v bn cc B. hai cc , ba cc , bn cc C . mt cc , hai cc , ba cc D. Ba cc , bn cc, nm cc

Cu 105 : Chc nng ca CB : A . ng ngt, bo v qu dng, bo v B. bo v qu dng, ng ngt, bo v in p thp in p caoC . ng ngt , bo v in p thp D. Bo v qu dng, bo v in p thp v in p cao bo v in p cao

Cu 106 : Theo tiu chun IEC 60898 , CB dn dng c loi type : a. A, B ,C b. B, C, Db . A,C,Dd. B,A,D

Cu 107 : Theo tiu chun IEC 60947-2, CB cng nghip c loi :a . A , Bb . B, Cc . A , Cd. A , D

Cu 108 : Theo tiu chun IEC 60898 , type no c dng cho cc ng dng gia dng v thng mi khng c dng xung chuyn mch : A . type BB. type CC . type DD. Type A

Cu 109 : : Theo tiu chun IEC 60898 , type no c dng cho cc ng dng gia dng v thng mi c dng xung chuyn mch :A . type BB. type CC . type DD. Type A

Cu 110 : Cho nh hnh v :

y l loi g : A . RCD , 2p B. MCCB , 2 pC . MCB , 2PD. RCCB , 2P

Cu 111 : Theo tiu chun IEC 60898 , loi MCB c nh c dy nh mc nm trong khong :A . 100 AC . 0.1sC . 0.1sC . 100 Ma

Cu 145 : RCD c cp phn phi trong h thng in thng p dng :A . chn RCD thng ngun c B . chn RCD h ngun cao C . RCD h ngun D . chn RCD thng ngun c dng d

Cu 146 : i vi thit b chng dng r in , trong h thng in mt pha trng hp thit b in khng c s c th : A . = B . C . D.

Cu 147 : i vi thit b chng dng r in , trong h thng in mt pha trng hp thit b in c s c th :A . = B . C . D.

Cu 148 : i vi thit b chng dng r in , trong h thng in ba pha trng hp thit b in khng c s c th :A . B. C .c a & bD.

Cu 149 : Cho 1 RCD c dng d tc ng nh mc th cng dng ca n l :A . bo v chng dng r B. bo v chng chyC . bo v chng in git D. Bo v ngun in

Cu 150 : Cho 1 RCD c dng d tc ng nh mc th cng dng ca n l :A . bo v chng dng r B. bo v chng chyC . bo v chng in git D. Bo v ngun in

Cu 151 : SPD type 1 l loi thit b c chc nng :A . chng xung in p gy ra do st nh trc tip vo ct thu st cng trnhB . chng xung in pC . bo v qu dng d ca mch inD . bo v ngn mch v qu ti

Cu 152 : Ngi ta thng lp SPD type 1 u :A . t in chnh cng trnhB. trong gia nhC . trong trng hc D. Trong cng vin

Cu 153 : Ti sao phi lp CB hay cu ch trc SPD :A . phng s c ngn mch khi SPD b hng B . bo v ngun in chy n nh C . iu ha c ngun in

Cu 154 : Ga s Dng x cc i ca SPD :A . gi tr nh ca dng xt , ng vi xung mu 8/20 m SPD type 2 chu c 1 ln trong php th class II.B . gi tr nh ca dng xt , ng vi xung mu 10/350 m SPD type 1 chu c 1 ln trong php th class I.C . gi tr nh ca dng xt , ng vi xung mu 10/20 m SPD type 2 chu c 1 ln trong php th class II.D . gi tr nh ca dng xt , ng vi xung mu 350/20 m SPD type 2 chu c 1 ln trong php th class II.

Cu 155 : Ga s dng xung limp ca SPD : A . gi tr nh ca dng xt , ng vi xung mu 8/20 m SPD type 2 chu c 1 ln trong php th class II.B . gi tr nh ca dng xt , ng vi xung mu 10/350 m SPD type 1 chu c 1 ln trong php th class I.C . gi tr nh ca dng xt , ng vi xung mu 10/20 m SPD type 2 chu c 1 ln trong php th class II.D . gi tr nh ca dng xt , ng vi xung mu 350/20 m SPD type 2 chu c 1 ln trong php th class II.

Cu 156 : chc nng ca SPD type 2 : A . chng xung in p do st lan truyn trong h thng in theo ng ngunB . chng xung in p do st nh trc tip vo ct thu st cng trnhC . chng qu ti v ngn mch trong h thng in D . bo v st p

Cu 157 : Ngi ta thng lp SPD type 2 u : A . t in chnh cng trnhB. t in phn phiC . gia nh D. Trong trng hc

Cu 158 : Khi u ni SPD ,tit din ti thiu v chiu di khng qu :A . tit din ti thiu l 4.0 mm v chiu di khng qu 0,5 mB . tit din ti thiu l 8.0 mm v chiu di khng qu 0,5 mC . . tit din ti thiu l 2.0 mm v chiu di khng qu 0,5 mD . . tit din ti thiu l 4.0 mm v chiu di khng qu 1 m

Cu 159 : Theo TCXDVN 394 , in p chu xung ca kh cch ly h thng 230/400V:A . 8 KvB. 4 KVC . 16 KV D . 10KV

Cu 160 : i vi khi ng t Vit nam , dng in qua tip im ph l:A . 20 AB. 5AC .10A D . 15A

Cu 161 : i vi khi ng t Vit nam , dng in qua tip im chnh l:A . 25AB . 20AC . 15AD. 10A

Cu 162 : Contactor l mt loi kh c in c dng :A . ng ngt mch in bng tay B . bo v mch in C . ng ngt cc mch in t xa t ng hay nt nhnD . ng ngt mch in t ng

Cu 163 : Theo nguyn l truyn ng ca contactor bao gm cc kiu :A . kiu in t , kiu thy lc B . kiu in t , kiu hi p C . kiu in t, kiu thy lc , kiu hi pD . kiu thy lc , kiu hi p

Cu 164 : Thng thng ngi ta thng s dng contactor theo :A . kiu c cu in t B. kiu c cu t inC . kiu c cu in ng D. Kiu c cu nam chm in

Cu 165 : Cu to ca c cu in t trong contactor bao gm :A . cun dy , phn np di ng, phn c nhB . phn c nh , phn np di ng , phn lo xo phn lc C . cun dy , li st , l xo phn lc D . cun dy , li st , phn c nh

Cu 166 : Tip im chnh ca contactor l loi tip im :A . tip im thng ngB . thng lp trong mch in iu khinC . tip im thng hD . c 2 loi l tip im thng ng v thng h

Cu 167 : : Tip im ph ca contactor l loi tip im :A . tip im thng ngB . thng lp trong mch in ng lcC . tip im thng hD . c 2 loi l tip im thng ng v thng h

Cu 168 : Cu no sau y khng phi l tip im chnh ca contactor :A . c kh ngn ti dng in ln B . thng lp trong mch in ng lc C . loi tip im thng h D . loi tip im thng ng

Cu 169: Tip im chnh ca contactor c dng in i qua : A . 10 A n vi nghn AB. 10A n vi trm AC . 5A D. 5AC. >10 AD. >100A

Cu 171 : Cun dy ht ca contactor c th lm vic bnh thng in p trong gii hn :A . ( 80- 105)% in p nh mc ca cun dyB . (85-100) % in p nh mc ca cun dyC . ( 85- 105)% in p nh mc ca cun dy D . ( 90 -105 )% in p nh mc ca cun dy

Cu 172 : Cng sut ghi trn contactor l ch :A . AC1B. AC2C . AC3D. AC4

Cu 173 : Dng in chy qua contactor l ch :A . AC1B. AC2C . AC3D. AC4

Cu 174 : Contactor dng ng ngt mch in c ti l l nung, hay chiu sng th chn theo ch :A . AC1 B. AC2C. AC3D. AC4

Cu 175 : Khi chn contactor khi ng cho ng c khng ng b roto dy qun , ta nn chn ch :A . AC1 B. AC2C. AC3D. AC4

Cu 176 : Khi chn contactor vn hnh cho ng c khng ng b roto lng sc , ta nn chn ch : A . AC1 B. AC2C. AC3D. AC4

Cu 177 : : Khi chn contactor khi ng cho ng c khng ng b roto lng sc , ta nn chn ch :A . AC1 B. AC2C. AC3D. AC4

Cu 178 : Khi contactor khi ng vi AC4 th tha iu kin :A . Im=Ic= (5 n 7 ln)B . 10 n 14 ln C . Ikd=ImD . Ik=2,5m

Cu 178 : Khi contactor khi ng vi AC1 th tha iu kin :A . Im=Ic= (5 n 7 ln)B . 10 n 14 ln C . Ikd=ImD . Ik=2,5m

Cu 179 : Khi contactor khi ng vi AC2 th tha iu kin :A . Im=Ic= (5 n 7 ln)B . 10 n 14 ln C . Ikd=ImD . Ik=2,5m

Cu 180 : Trong qu trnh chn contactor , ta chn contactor xoay chiu theo ch AC3 khi :A . mch ph ti ca contactor l ti thun tr B . mch ph ti ca contactor l ng c 3 pha roto lng scC . mch ph ti ca contactor l ng c mt chiu kch thch t song songD . mch ph ti ca contactor l ng c khng ng b roto dy qun

Cu 181 : chn contactor ng ct cho ti l l nung c thng s sau : Pm = 5 KW; Um =220V ; A . 21,2 B . 28,4 AC . 25,3D. 21,3 A

Cu 182 : Chn contactor theo ti l ng c khng ng b 3 pha lng sc , c thng s : Pm = 20 HP; Um = 380v ; cos ; Kmm= 3 ; A . 67,6 AB. 48,2AC. 40,4 AD. 33,8A

Cu 183 : R le nhit l kh c in bo v : A . qu tiB . tng pC . ngn mch D. St p

Cu 183* : R le in p l loi kh c in dng bo v :A . qu tiB . tng pC . ngn mch D. St p

Cu 184 : Phn loi theo kt cu , r le nhit c chia thnh cc loi : A . kiu h v kiu kn B. mt cc , hai cc C . trc tip, gin tipD. Kiu kh nn , kiu in tr nhit

Cu 185 : Phn loi theo yu cu s dng , r le nhit c chia thnh cc loi :A . kiu h v kiu kn B. mt cc , hai cc C . trc tip, gin tipD. Kiu kh nn , kiu in tr nhit

Cu 186 : c tnh c bn ca r le nhit l : A . c tnh thi gian tc ng v dng in chy qua ph ti B . c tnh r le nhit v c tnh i tngC . c tnh khi ng t v dng in D . tt c u sai

Cu 187 : La chn ng r le nhit l sao cho : A . ng c tnh A-s ca r le gn st c tnh A-s ca i tng cn c bo v B . ng c tnh A-s ca r le thp hn c tnh A-s ca i tng cn c bo vC . ng c tnh A-s ca r le cng cao cng tt c tnh A-s ca i tng cn c bo vD . ng c tnh A-s ca r le cao hn c tnh A-s ca i tng cn c bo v

Cu 188 : cho hai ng c khng ng b ba pha hot ng theo mch ng lc v mch iu khin la :

Sau khi tc ng vo nt ON th trng thi hot ng cui cng l :A . ng c 1 hot ng B . ng c 2 hot ng C . ng c 1 v 2 cng hot ngD . c hai ng c u dng

Cu 189 : Trong qu trnh hot ng ca mch cu trn , nu c s c ng c 1 lm cho dng in qua mch in ng c 1 tng ln v r le nhit bo v qu ti cho ng c ny tc ng . sau khi r le ny tc ng th :A . ng c 1 dng v ng c 2 hot ng B . ng c 2 dng v ng c 1 hot ng C . ng c 1 v ng c 2 u dngD . ng c 1 v ng c 2 u hot ng

Cu 190 :R le c phn loi theo nguyn l lm vic bao gm cc loi : A . in t , t in ,in ng , cm ng , nhit B . s cp , th cp C . mt chiu v xoay chiuD . dng cc di , in p cc tiu , so lch dng ,cng sut

Cu 191 : R le c phn loi theo cch mc c cu thu bao gm cc loi :A . in t , t in ,in ng , cm ng , nhit B . s cp , th cp C . mt chiu v xoay chiuD . dng cc di , in p cc tiu , so lch dng ,cng sut

Cu 192 : R le c phn loi theo cng dng bao gm :A . in t , t in ,in ng , cm ng , nhit B . s cp , th cp C . mt chiu v xoay chiuD . dng cc di , in p cc tiu , so lch dng ,cng sut

Cu 193 : Theo nguyn l tc ng ca c cu chp hnh th r le bao gm :A . ro le c tip im v khng tip im B . ro le tng t , ro le s C . r le tc ng , r le bo v D . r le dng cc i , r le in p cc tiu

Cu 194 : Theo tnh cht bin i ca tn hiu vo v tn hiu ra c x l trong r le bao gm cc loi no : A . ro le c tip im v khng tip im B . ro le tng t , ro le s C . r le tc ng , r le bo v D . r le dng cc i , r le in p cc tiu

Cu 195 : Nguyn l lm vic ca r le t in : A . da trn tc dng ca lc t trng do nam cham vnh cu tc ng vo cun dy B . da trn tc dng nhit ca ro le gy ra t trngC . da trn tc dng ca t trng do dng in tc ng vo D . da trn tc ng ca lc t trng gy ra

Cu 196 : Hnh nh sau y m t c cu r le no ?

A . r le in ng B. ro le t in C . ro le cm ngD. R le in t

Cu 197 : i vi loi r le tc ng khng tuyn tnh th thi gian tc ng ca n :A . < sB. >1 sC .( 1:50). sD. (50:150).

Cu 198 : i vi loi r le thi gian th thi gian tc ng ca n :A . < sB. >1 sC .( 1:50). sD. (50:150).

Cu 199 : R le trung gian hot ng theo c cu :A . in tB. in ngC . t in D. Cm ng

Cu 200 : R le trung gian c h thng tip im chu dng in :A . B. C . >5 AD. < 5A

Cu 201 : Hnh nh sau m t c cu r le no :

A . c cu t in B. c cu in ngC . c cu in t D. C cu phn cc

Cu 202 : Hnh nh sau m t c cu r le no :

A . c cu t in B. c cu in ngC . c cu in t D. C cu phn cc

Cu 203 : im khc nhau gia contactor v r le trung gian l :A . c 1 loi tip im ph c kh nng ti dng in nh B . tip im khng c bung dp h quangC . tip im thng ng v thng hD . c a & b

Cu 204 : R le trung gian c k hiu SINGLE POLE DOULE THROW ( SPDT) c:A . mt cp tip im B. mt tip im C . hai cp tip im D. Hai tip im

Cu 205 : Hnh nh sau m t cu trc ca r le no ?

A . r le trung gian B. r le thi gian C . r le in tD. R le in ng

Cu 206 : R le mang k hiu DOUBLE POLE DOUBLE THROW ( DPDT ) c :A . mt cp tip im B. mt tip im C . hai cp tip im D. Hai tip im

Cu 207 : R le trung gian mang k hiu SINGLE POLE SINGLE THROW ( SPST) c :A . mt cp tip im thng hB. mt tip im thng hC . hai cp tip im thng hD. Hai tip im thng h

Cu 208 : R le trung gian mang k hiu DOUBLE POLE SINGLE THROW (DPST) c :A . mt cp tip im thng hB. mt tip im thng hC . hai cp tip im thng hD. Hai tip im thng h

Cu 209 : Cho hnh sau thuc loi r le c cu no :

A . r le thi gianB. r le in tC . r le t in D. R le trung gian

Cu 210 : R le thi gian hot ng theo c cu : A . in tB. in ng C . t in D. Cm ng

Cu 211 : R le cc tiu dng bo v :A . non ti B. dng inC . qu tiD. Cc i

Cu 212 : Theo yu cu s dng , R le thi gian c :A . cm ngB. bn loiC . ba loi D. Hai loi

Cu 213 : Cho hnh sau ? hi y l r le no :

A. R le thi gian OFF DELAYB. R LE th gian ON DELAYC. R le trung gianD. R le in t

Cu 214 : y l loi c cu r le no :

A . r le in ng B. r le thi gianC . r le xungD. R le trung gian

Cu 215 : R le dng in l loi kh c in dng bo v :A . qu ti v ngn mchB. qu ti hay ngn mchC . st pD. Tng p

Cu 216 : Hnh nh chp hnh c cu in t no :

A . khp li in t ma st B . khp li in t kiu bmC . khp li in t cm ng D . khp ly in t .

Cu 217 : Hnh nh sau l khp li hp in t kiu no : A . khp li in t ma st B . khp li in t kiu bmC . khp li in t cm ng D . khp ly in t .

Cu 218 : Hnh nh sau l khp li hp in t kiu no :

A . khp li in t ma st B . khp li in t kiu bmC . khp li in t cm ng D . khp ly in t .

Cu 219 : Trong dao cch ly trung th , ng ta dng loi tip im no : A . tip im kiu cu B. tip im kiu daoC . tip im kiu congsonD. Tip im kiu ngn

Cu 220 : Cng dng ca UPS l : A . lm ngun d phng cho cc thit b in duy tr hot ng ca thit b B . lm ngun ch yu cho cc thit b in hot ng C . to ra dng in cho thit b in hot ng D . bo v qu ti v ngn mch

Cu 221 : B lu in UPS phn loi theo ch lm vic bao gm cc loi :A . 1 loiB. 2 loiC . 3 loiD. 4 loi

Cu 222 : Nguyn l lm vic ca b lu in UPS l : A . tch tr nng lng bng acqui v bin i dng in xoay chiu B . bin i dng in to ra ngun cung cp cho thit bC . tch tr nng lng t bn ngoi v to ra dng inD . bin i dng in xoay chiu thnh mt chiu