At rated voltage, starting torque is 150 Nm. If voltage is reduced to 70%, starting torque becomes:

Option 1: 73.5 Nm

Option 2: 105 Nm

Option 3: 122.5 Nm

Option 4: 150 Nm

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Correct Option: 1

Explanation

Starting torque varies as square of voltage. New torque = (0.7)² × 150 = 73.5 Nm.