🔍 Key Concepts

• How the full load current curve changes on the left graph as voltage goes below 0% (negative percent change in voltage) • What happens to starting current and starting/breakdown torque on the same graph as voltage decreases • Basic motor rule: for an induction motor at constant load, current often changes in the opposite direction of voltage off its rated value

💭 Think About

• On the left graph, pick a point such as -10% voltage and read the value on the full load current curve. Is the current higher or lower than 0%? • Compare the directions (upward or downward) of the starting current and starting/breakdown torque curves when you move left to a lower voltage. Do either of those become higher than normal at reduced voltage? • If the motor is asked to deliver the same mechanical load but at a lower voltage, what must happen to the current to maintain approximately the same power output?

✅ Before You Answer

• Verify on the off-standard voltage (left) graph that you are reading the correct labeled curve for full load current and not torque or slip • Check that you are looking at the performance changes at a negative percent voltage (left of zero), since the question says "significantly below" rated voltage • Confirm whether each statement in the choices matches the direction of change (up or down from zero) shown by the graph for that parameter