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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is electromechanical energy conversion?
💡 Hint: Think of how motors and generators function.
Question 2
Easy
State the formula for synchronous speed.
💡 Hint: It involves the supply frequency and number of poles.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the principle behind electromechanical energy conversion?
- Magnetic field change induces voltage
- There is no energy change
- Current always flows in one direction
💡 Hint: Consider how energy transformations occur.
Question 2
True or False: Back EMF increases when motor speed increases.
- True
- False
💡 Hint: Think about the motor's behavior under increased load.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A three-phase induction motor takes in 40 kW, has stator losses of 800 W, and core losses of 600 W. If it runs at 1200 RPM, calculate: synchronous speed, slip, air-gap power, rotor copper losses, and overall efficiency.
💡 Hint: Use previously discussed equations and details from the efficiency section.
Question 2
For a separately excited DC motor, if the armature current is 10 A and the supply voltage is 220 V, calculate the back EMF if the armature resistance is 1 Ω.
💡 Hint: Remember how back EMF functions in regulating current.
Challenge and get performance evaluation