636 Period 3 Motor Final Practice Test

The amount a standard electric motor can vary from its rated voltage is expressed as plus or minus ten percent. In other words, the motor is designed to run safely when the supply is between 90% and 110% of its nominal voltage. This tolerance accounts for normal fluctuations in power distribution, transformer drops, and wiring losses that occur in real installations. Staying within this range helps ensure the motor develops sufficient torque and doesn’t overheat; voltages far outside this band can cause reduced performance, starting issues, or insulation stress. So, the conventional way to state it is a ±10% tolerance, which matches the common practice for many motors.