10 Questions
If the instantaneous power drawn is negative for 2 milliseconds in one cycle, what is the likely power factor angle?
36°
In an electromechanical energy conversion device, what does the developed torque depend upon?
stator field and rotor field strengths and the torque angle
What is the likely number of poles on the rotor of an elementary cylindrical machine?
four
What is a common application of stepper motors?
control system applications
If a current of 1 A through a coil creates a core flux of 1 mWb, what is the likely number of turns on the coil?
1000 turns
What is the energy stored in the magnetic field of a coil with 1000 turns, a current of 1 A, and a core flux of 1 mWb?
1 J
What is the emf induced in a conductor of a machine driven at 600 rpm, with a diameter of 2.0 meters and a length of 0.30 meters, and a peak value of flux density of 1.0 Wb/m²?
41.83 V
What is the peak value of flux density in a machine driven at 600 rpm, with a diameter of 2.0 meters and a length of 0.30 meters?
1.0 Wb/m²
What is the relationship between the energy stored in the magnetic field and the number of turns of a coil?
Directly proportional to the square
What is the unit of measurement for the core flux?
Weber
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