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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What does back EMF oppose in a DC motor?
💡 Hint: Think about the role of induced voltages.
Question 2
Easy
Define torque in the context of motors.
💡 Hint: Consider what causes the motor to rotate.
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 back EMF in a DC motor?
- The voltage that assists armature current
- The voltage that opposes the applied voltage
- The voltage produced by the stator
💡 Hint: Think about what happens when an armature moves in a magnetic field.
Question 2
True or False: Torque is directly proportional to back EMF.
- True
- False
💡 Hint: Remember how torque develops in relation to current.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A DC motor with an armature current of 10 A and magnetic flux of 0.1 Wb produces a torque of 2 Nm. Calculate the constant (k_a) and explain its significance.
💡 Hint: Relate your answer back to the production of torque in practical applications.
Question 2
Given a motor starts with zero speed and back EMF is initially 0, explore how the armature current changes as speed increases to a rated value. Discuss operational efficiency.
💡 Hint: Reflect on the implications for power factor and energy consumption.
Challenge and get performance evaluation