ECET 375 WEEK 4 HOMEWORK / DATA COMMUNICATIONS AND NETWORKING WITH LAB
ECET 375 Week 4 Homework Answers (DEVRY)
QUESTIONS
3–1. What is the principal difference between a synchronous machine and an induction machine?
3–2. Why does switching the current flows in any two phases reverse the direction of the rotation of a stator’s magnetic field?
3–3. What is the relationship between electrical frequency and magnetic field speed for an ac machine?
PROBLEMS
3–3. The first ac power system in the United States ran at a frequency of 133 Hz. If the ac power for this system was produced by a four-pole generator, how fast would the shaft of the generator have to rotate?
3–7. Modify the MATLAB in Example 3–1 by swapping the currents flowing in any two phases. What happens to the resulting net magnetic field?
3–8. If an ac machine has the rotor and stator magnetic fields shown in Figure P3–1, what is the direction of the induced torque in the machine? Is the machine acting as a motor or generator?
Comments
Post a Comment