🔍 Key Concepts

• Formula for synchronous speed of an induction motor and what variables it depends on • Effect of changing line frequency versus changing number of poles • How load affects slip versus actual speed setting

💭 Think About

• Write the standard formula for synchronous speed of an AC induction motor and identify which of the options appear in that formula • Ask yourself whether the load changes the motor’s designed synchronous speed or only causes a small change from that speed (slip) • Consider whether any of the choices are not fundamental ‘settings’ of speed but instead influence how closely the rotor follows the synchronous speed

✅ Before You Answer

• Know the formula: synchronous speed depends on frequency and number of poles • Clarify the difference between synchronous speed and actual rotor speed under load • Decide if the question is asking what fundamentally determines speed, or what can influence the running speed in practice