REET 425 WEEK 1 HOMEWORK / ELECTRIC MACHINES AND POWER SYSTEMS WITH LAB

REET 425 WEEK 1 HOMEWORK / ELECTRIC MACHINES AND POWER SYSTEMS WITH LAB

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REET 425 Week 1 Homework Answers (DeVry)

1–2.What is Ampere’s law?

1–5.What is reluctance?

1–8.What is hysteresis? Explain hysteresis in terms of magnetic domain theory.

1–9.What are eddy current losses? What can be done to minimize eddy current losses in a core?

1–11.What is Faraday’s law?

1–12.What conditions are necessary for a magnetic field to produce a force on a wire?

1–13.What conditions are necessary for a magnetic field to produce a voltage in a wire?

1–16.Just how does a decrease in flux produce an increase in speed in a linear machine?

1–1.A motor’s shaft is spinning at a speed of 1800 r/min. What is the shaft speed in radians per second?

1–3.A force of 10 N is applied to a cylinder of radius r0.15 m, as shown in Figure P1–1.The moment of inertia of this cylinder is J4 kg • m2. What are the magnitude anddirection of the torque produced on the cylinder? What is the angular acceleration of the cylinder?

1–18.Assume that the voltage applied to a load is V20830°Vand the current flowing through the load is I220°A.