Professional Courses
Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.
Categories
Interactive Games
Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.
Typing
Memory
Math
English Adventures
Knowledge
Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What are the two primary methods of speed control in DC motors?
💡 Hint: Think about how voltage and current variations affect speed.
Question 2
Easy
Define back EMF in the context of DC motors.
💡 Hint: Consider how motion in a magnetic field affects voltage.
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 primary technique for speed control in a DC motor below the base speed?
- Field Flux Control
- Armature Voltage Control
- PID Control
💡 Hint: Think about how the speed is adjusted using voltage.
Question 2
True or False: Reducing the field current in a DC motor will always increase the torque.
- True
- False
💡 Hint: Consider how torque is related to magnetic flux.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
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.
Question 2
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.
Challenge and get performance evaluation