For the following electric machine answer the following five cases: A 3-phase, 460−V,1740-rpm, 60−Hz,4-Pole, Y-connected wound-rotor induction motor has the following Parameters Per phase; R 1=0.25Ω
R 2=0.2Ω
X 1=0.5Ω
X 2=0.5Ω
X m =30Ω
1. The starting current when started direct at rated voltage: a)265.9<66 ∘ A
b) 254.9∠−66 ∘A
c) 244.2∠−66 ∘ A
d) 423∠−66 ∘A
e) none
2. The imput impedance (per phase) at starting conditions is: a)1.0876∠66 ∘
Ω b) 1.8<−66 ∘Ω
c) 1.08∠+66 ∘ Ω
d) d) 1∠66 ∘Ω
e) none
3. Thevenin Voltage is:
a) 261.2 V
b) 227.5 v
c) 266.03 V
d) 452.4 V
e) none
4. The starting torque is:
a) 195.9Nm
b) 163.1Nm
c) 285.2Nm
d) 184.2Nm
e) none
5. The full-load torque is:
a)163.1Nm
b) 136.1Nm
c) 113.5Nm
d) 183.5Nm
e) none