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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 2

Option 4 : voltage

- The current drawn by a motor is determined by the stator impedance and voltage applied across the terminals.
- Let the applied voltage is V
_{S }and stator impedance is Z_{m}, then current (I_{m}) drawn by motor is

\({I_m} = \frac{{{V_S}}}{{{Z_m}}} = \frac{{{V_S}}}{{R + j{X_m}}}\)

Where R & X_{m }are stator resistance and reactance respectively.

- The current drawn by the machine causes a stator-impedance drop and the balance voltage is applied across the magnetizing branch.
- However, since the magnetizing branch impedance is large, the current drawn is small and hence the stator impedance drop is small compared to the applied voltage (rated value).