Practice Activities/assessments (2) - DC and AC Electrical Machines - Basics of Electrical Engineering
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Activities/Assessments

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Practice Questions

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Question 1 Easy

What is a rotating magnetic field?

💡 Hint: Think about how AC current flows in phases.

Question 2 Easy

Define back EMF.

💡 Hint: Remember how it regulates current as speed increases.

4 more questions available

Interactive Quizzes

Quick quizzes to reinforce your learning

Question 1

What is a rotating magnetic field?

A field that changes direction
A stationary field
A field that rotates in space

💡 Hint: Consider the arrangement of the windings.

Question 2

True or False: Back EMF decreases with increasing speed.

True
False

💡 Hint: How does it respond as the rotor speeds up?

2 more questions available

Challenge Problems

Push your limits with advanced challenges

Challenge 1 Hard

An induction motor has a synchronous speed of 1500 RPM and a slip of 4%. What is the rotor speed?

💡 Hint: Use the relation between synchronous speed and slip.

Challenge 2 Hard

Given a back EMF of 120 V in a DC motor with an armature resistance of 0.5 Ω and an applied voltage of 240 V, what is the armature current?

💡 Hint: Use the back EMF equation to solve for current.

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