C\u00e2u 1:<\/b>\u00a0M\u1ed9t m\u00e1y ph\u00e1t \u0111i\u1ec7n xoay chi\u1ec1u m\u1ed9t pah c\u00f3 roto g\u1ed3m 4 c\u1eb7p c\u1ef1c t\u1eed, mu\u1ed1n t\u1ea7n s\u1ed1 c\u1ee7a d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u m\u00e0 m\u00e1y ph\u00e1t ra l\u00e0 50 Hz th\u00ec roto ph\u1ea3i quay v\u1edbi t\u1ed1c \u0111\u1ed9<\/p>\n

A. 500 v\u00f2ng\/ ph\u00fat \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 750 v\u00f2ng\/ph\u00fat<\/p>\n

C. 1500 v\u00f2ng\/ph\u00fat \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 3000 v\u00f2ng\/ph\u00fat<\/p>\n

C\u00e2u 2:<\/b>\u00a0Trong m\u1ea1ch \u0111i\u1ec7n xoay chi\u1ec1u ba pha, t\u1ea3i m\u1eafc h\u00ecnh sao c\u00f3 d\u00e2y trung h\u00f2a, khi m\u1ed9t paha ti\u00eau th\u1ee5 \u0111i\u1ec7n b\u1ecb h\u1edf th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n trong hai pha c\u00f2n l\u1ea1i<\/p>\n

A. \u0110\u1ec1u t\u0103ng l\u00ean \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. \u0110\u1ec1u gi\u1ea3m xu\u1ed1ng<\/p>\n

C. Kh\u00f4ng thay \u0111\u1ed5i \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. \u0110\u1ec1u b\u1eb1ng 0<\/p>\n

C\u00e2u 3:<\/b>\u00a0M\u1ed9t m\u00e1y ph\u00e1t \u0111i\u1ec7n xoay chi\u1ec1u t\u1ea1o n\u00ean su\u1ea5t \u0111i\u1ec7n \u0111\u1ed9ng e=220\u221a2 cos100\u03c0t (V). T\u1ed1c \u0111\u1ed9 quay c\u1ee7a roto l\u00e0 1500 v\u00f2ng\/ ph\u00fat. S\u1ed1 c\u1eb7p c\u1ef1c c\u1ee7a roto l\u00e0<\/p>\n

A. 2 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 4<\/p>\n

C. 5 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 6<\/p>\n

C\u00e2u 4:<\/b>\u00a0M\u1ed9t m\u1ea1ch ti\u00eau th\u1ee5 \u0111i\u1ec7n l\u00e0 cu\u1ed9n d\u00e2y c\u00f3 \u0111i\u1ec7n tr\u1edf thu\u1ea7n r = 8 \u03a9, ti\u00eau th\u1ee5 c\u00f4ng su\u1ea5t P=32 W v\u1edbi h\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t cos\u03c6 = 0,8. \u0110i\u1ec7n n\u0103ng \u0111\u01b0\u1ee3c \u0111\u01b0a t\u1eeb m\u00e1y ph\u00e1t \u0111i\u1ec7n xoay chi\u1ec1u m\u1ed9t pha nh\u1edd d\u00e2y d\u1eabn c\u00f3 \u0111i\u1ec7n tr\u1edf R = 4 \u03a9. \u0110i\u1ec7n \u00e1p hi\u1ec7u d\u1ee5ng gi\u1eefa hai \u0111\u1ea7u \u0111\u01b0\u1eddng d\u00e2y n\u01a1i m\u00e1y ph\u00e1t l\u00e0<\/p>\n

A. 10\u221a5 V \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 28 V<\/p>\n

C. 12\u221a5 V \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 24 V<\/p>\n

C\u00e2u 5:<\/b>\u00a0M\u1ed9t \u0111\u1ed9ng c\u01a1 kh\u00f4ng \u0111\u1ed3ng b\u1ed9 ba pha \u0111ang ho\u1ea1t \u0111\u1ed9ng c\u00f3 t\u1ea3i. Bi\u1ebft roto quay v\u1edbi t\u1ea7n s\u1ed1 l\u00e0 f v\u00e0 chu k\u00ec c\u1ee7a d\u00f2ng \u0111i\u1ec7n l\u00e0 T. So s\u00e1nh T v\u00e0 f ta th\u1ea5y<\/p>\n

<\/p>\n

C\u00e2u 6:<\/b>\u00a0M\u1ed9t \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n xoay chi\u1ec1u c\u00f3 \u0111i\u1ec7n tr\u1edf d\u00e2y qu\u1ea5n l\u00e0 20 \u03a9. M\u1eafc \u0111\u1ed9ng c\u01a1 vao m\u1ea1ng \u0111i\u1ec7n xoay chi\u1ec1u \u00f3 \u0111i\u1ec7n \u00e1p hi\u1ec7u d\u1ee5ng l\u00e0 220 V. Gi\u1ea3 s\u1eed h\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t c\u1ee7a \u0111\u1ed9ng c\u01a1 l\u00e0 cos\u03c6 = 0,85 kh\u00f4ng thay \u0111\u1ed5i, hao ph\u00ed trong \u0111\u1ed9ng c\u01a1 ch\u1ec9 dol t\u1ecfa nhi\u1ec7t. C\u00f4ng su\u1ea5t c\u01a1 c\u1ef1c \u0111\u1ea1i m\u00e0 \u0111\u1ed9ng c\u01a1 c\u00f3 th\u1ec3 sinh ra l\u00e0<\/p>\n

A. 437 W \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 242 W<\/p>\n

C. 371 W \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 650 W<\/p>\n

C\u00e2u 7:<\/b>\u00a0Khi m\u00e1y ph\u00e1t \u0111i\u1ec7n ba pha ho\u1ea1t \u0111\u1ed9ng, \u1edf th\u1eddi \u0111i\u1ec3m su\u1ea5t \u0111i\u1ec7n \u0111\u1ed9ng \u1edf m\u1ed9t cu\u1ed9n d\u00e2y \u0111\u1ea1t gi\u00e1 tr\u1ecb c\u1ef1c \u0111\u1ea1i e_{1<\/sub>=Eo<\/sub>\u00a0th\u00ec su\u1ea5t \u0111i\u1ec7n \u0111\u1ed9ng \u1edf hai \u0111\u1ea7u cu\u1ed9n d\u00e2y c\u00f2n l\u1ea1i l\u00e0<\/p>\n}

<\/p>\n

C\u00e2u 8:<\/b>\u00a0M\u1ed9t m\u00e1y ph\u00e1t \u0111i\u1ec7n xoay chi\u1ec1u m\u1ed9t pha c\u00f3 ph\u1ea7n \u1ee9ng g\u1ed3m 4 cu\u1ed9n d\u00e2y gi\u1ed1ng nh\u00e2u m\u1eafc n\u1ed1i ti\u1ebfp, c\u00f3 su\u1ea5t \u0111i\u1ec7n \u0111\u1ed9ng hi\u1ec7u d\u1ee5ng 100 V v\u00e0 t\u1ea7n s\u1ed1 50 Hz. T\u1eeb th\u00f4ng c\u1ef1c \u0111\u1ea1i qua m\u1ed7i v\u00f2ng d\u00e2y l\u00e0 \u0424_{o<\/sub>=0,375 mWb. S\u1ed1 v\u00f2ng d\u00e2y c\u1ee7a m\u1ed7i cu\u1ed9n d\u00e2y trong ph\u1ea7n \u1ee9ng l\u00e0<\/p>\n}

A. 300 v\u00f2ng \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 150 v\u00f2ng<\/p>\n

C. 75 v\u00f2ng \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 37,5 v\u00f2ng<\/p>\n

H\u01b0\u1edbng d\u1eabn gi\u1ea3i v\u00e0 \u0111\u00e1p \u00e1n<\/b><\/p>\n\n\n\n\n

C\u00e2u<\/td>\n	1<\/td>\n	2<\/td>\n	3<\/td>\n	4<\/td>\n	5<\/td>\n	6<\/td>\n	7<\/td>\n	8<\/td>\n<\/tr>\n
\u0110\u00e1p \u00e1n<\/td>\n	B<\/td>\n	C<\/td>\n	A<\/td>\n	C<\/td>\n	B<\/td>\n	A<\/td>\n	D<\/td>\n	A<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n C\u00e2u 1:<\/b>\u00a0B<\/p>\n f = np \u21d2 n = f\/p = 750 v\u00f2ng\/ ph\u00fat.<\/p>\n C\u00e2u 4:<\/b>\u00a0C<\/p>\n <\/p>\n C\u00e2u 6:<\/b>\u00a0A<\/p>\n <\/p>\n C\u00e2u 7:<\/b>\u00a0D<\/p>\n <\/p>\n C\u00e2u 8:<\/b>\u00a0A<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" C\u00e2u 1:\u00a0M\u1ed9t m\u00e1y ph\u00e1t \u0111i\u1ec7n xoay chi\u1ec1u m\u1ed9t pah c\u00f3 roto g\u1ed3m 4 c\u1eb7p c\u1ef1c t\u1eed, mu\u1ed1n t\u1ea7n s\u1ed1 c\u1ee7a d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u m\u00e0 m\u00e1y ph\u00e1t ra l\u00e0 50 Hz th\u00ec roto ph\u1ea3i quay v\u1edbi t\u1ed1c \u0111\u1ed9 A. 500 v\u00f2ng\/ ph\u00fat \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 750 v\u00f2ng\/ph\u00fat C. 1500 v\u00f2ng\/ph\u00fat \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 3000 v\u00f2ng\/ph\u00fat C\u00e2u 2:\u00a0Trong […]<\/p>\n","protected":false},"author":3,"featured_media":25949,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[158],"tags":[1443,1442],"yoast_head":"\n