Giai T a i t r u n g diem dao dong eua h a i nguon t r u y e n tori ngi/gfc pha nen bietn dp dao dong t o n g hgfp bSng Vay chgn dap an C Cdu 40: P h a t bieu nao sau day la dung k h i n o i ve dong d i e n xoay chieu ba pha? A K h i cifcfng dong dien t r o n g m o t pha b k n g k h o n g t h i cifdng dong dien t r o n g h a i pha l a i khac k h o n g B Chi C O dong dien xoay chieu ba pha m d i tao diic/c tCf tn/c/ng quay C K h i ciidng dong dien t r o n g m o t pha ctfc d a i t h i ci/cfng dong dien t r o n g h a i pha l a i ctfc tieu D Dong dien xoay chieu ba pha la h e t h o n g gom ba dong dien xoay chieu m o t pha, lech pha goc 2n — Giai Dong dien xoay chieu ba pha la he t h o n g gom ba dong d i e n xoay chieu m o t pha, lech pha goc Vay chon dap an D Cdu 41: Neu chum t i a sang 16 k h o i t h a u k i n h p h a n k y ma h o i t u t a i mot diem t h i chum t i a td\u k i n h c6 diTdng keo d a i : A giao cf sau t h a u k i n h va giao d i e m each t h a u k i n h m o t khoang nho h o n Idrn t i e u C L T cua t h a u k i n h B giao d sau t h a u k i n h va giao d i e m each t h a u k i n h m o t khoang Idfn hon Idfn t i e u C L T cua t h a u k i n h C giao of sau t h a u k i n h va giao diem t r u n g vdri t i e u d i e m v a t cua t h a u k i n h D song song vdfi true c h i n h cua t h a u k i n h Giai Neu chum t i a sang 16 k h o i t h a u k i n h p h a n k y m a h o i t u t a i m o t diem t h i chum t i a t i t h a u k i n h d6 c6 dudng keo d a i giao sau thau k i n h va giao diem each t h a u k i n h m o t khoang nho hOn 16n tieu C U T ciia t h a u k i n h Vay chgn dap an A Giai Chi tietde thi TS D H , C D Mon Vat li , ' 19