Practice - Speed Control of DC Motors
Practice Questions
Test your understanding with targeted questions
What are the two primary methods of speed control in DC motors?
💡 Hint: Think about how voltage and current variations affect speed.
Define back EMF in the context of DC motors.
💡 Hint: Consider how motion in a magnetic field affects voltage.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the primary technique for speed control in a DC motor below the base speed?
💡 Hint: Think about how the speed is adjusted using voltage.
True or False: Reducing the field current in a DC motor will always increase the torque.
💡 Hint: Consider how torque is related to magnetic flux.
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Challenge Problems
Push your limits with advanced challenges
A DC motor is powered by a 120 V supply, with an armature resistance of 2 Ω. When operating at steady state, it draws a current of 10 A. Calculate the back EMF, and explain its significance.
💡 Hint: Apply the back EMF formula and consider its operational significance in motors.
If a motor runs at a speed of 3000 RPM with a field current setting the flux at 1 Wb, what will happen to the speed if the field current is reduced by 25%? Assume linear behavior.
💡 Hint: Use the proportional nature of speed and flux to derive the new speed.
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Reference links
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