C. Thay do iL de Uimax D Thay do if de Ucma
cue dai qua khung day la
A. 2,4.10-3 Wb. B. l,2.10-3Wb. C. 4,8.10-^Wb D. 0,6.10-^Wb.
A. 2,4.10-3 Wb. B. l,2.10-3Wb. C. 4,8.10-^Wb D. 0,6.10-^Wb.
Chpn dap an A ;,
Cau 2: Mot may phat dien xoay chieu mot pha c6 phan cam la roto gom 16 cap cue. Roto quay voi toe dp 150 vong/phut. Tan so do may phat ra la: cue. Roto quay voi toe dp 150 vong/phut. Tan so do may phat ra la:
A. f = 35Hz B. f = 40Hz C. f = 45Hz D. f = 50Hz
Phan tich vd hirang ddn gidi
Tan so do may phat ra dupe tinh theo cong thuc: f = = ^^^-^^ = 40Hz. ' ^ ^ 60 60 ' ^ ^ 60 60
Chpn dap an B
Cau 3: Mot may phat dien xoay chieu mot pha c6 phan cam la roto gom 10
cap cue (10 cue nam va 10 cue bae). Tan so eua suat dien dong cam ling do may phat ra bang 50 Hz thi roto phai quay voi toe dp bang bao nhieu? may phat ra bang 50 Hz thi roto phai quay voi toe dp bang bao nhieu? A. n = 350 vong/phut B. n = 250 vong/phut
C. n = 30 vong/phut D. n = 400 vong/phut
^jjjjll' Phan tich vd hu&ng ddn gidi
Toe dp quay eua roto dupe suy ra tu cong thuc tinh tan so'. Vi the'ta c6: , pn 60f 60.50 - , , , pn 60f 60.50 - , ,
f = — => n = = = 300 vong/phut. , I
60 p 10
Chpn dap an C
Cau 4: Mot may phat dien xoay chieu c6 dien tro trong khong dang ke. Mach ngoai la eupn cam thuan noi tie'p voi ampe ke'nhi^t c6 dien tro nho. Khi roto ngoai la eupn cam thuan noi tie'p voi ampe ke'nhi^t c6 dien tro nho. Khi roto quay voi toe dp goc (Oj = lOOTtrad / s thi ampe ke'chi 0,5A. Khi roto quay voi toe dp goc (1)2 = 50:: rad / s thi ampe ke'chi
A. 1 A. B. 0,5 A. C. 0,2 A. D. 0,9 A.
fki Phan tich vd hu&ng ddn gidi >