Practice - Three-Phase Induction Motor: The Industrial Workhorse
Practice Questions
Test your understanding with targeted questions
What is slip in the context of induction motors?
💡 Hint: Think about how speed differences influence motor function.
Name one starting method for three-phase induction motors.
💡 Hint: This method connects the motor directly to the power supply.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the formula for calculating slip?
💡 Hint: Keep the concept of speed differences in mind.
A Direct-On-Line (DOL) starter reduces starting current significantly.
💡 Hint: Consider what happens when a motor starts directly from the line voltage.
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Challenge Problems
Push your limits with advanced challenges
A three-phase induction motor has a synchronous speed of 1500 RPM and operates at a slip of 4%. Calculate:
1. Rotor speed (Nr)
2. What would the slip be at full load if the rotor speed drops to 1440 RPM?
💡 Hint: Use the slip formula for both calculations!
An induction motor has a power input of 20 kW, with stator losses of 800 W and rotor losses of 500 W. Calculate the overall efficiency and explain how losses affect efficiency.
💡 Hint: Keep the losses in mind when calculating efficiency!
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Reference links
Supplementary resources to enhance your learning experience.