A 4極
B 6極
C 8極
D 12極
f = PN120
N = 30 × 60 =1800 rpm
60 = P×1800120
P = 4
A 50%
B 33%
C 20%
D 16%
T = 1f = 11000 = 1ms
工作週期= 200μ1m × 100% = 200×10–61×10–3 × 100% = 20%
A 200m
B 300m
C 400m
D 500m
λ = vf = 3×108600×103 =500 m
A 
B
C
D 
f = PN120 = 8×750120 = 50Hz
T = 1f = 150 =20ms
2T = 20m×2 = 40ms
Vm=110×√2 V
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