Podcast
Questions and Answers
If the instantaneous power drawn is negative for 2 milliseconds in one cycle, what is the likely power factor angle?
If the instantaneous power drawn is negative for 2 milliseconds in one cycle, what is the likely power factor angle?
- 45°
- 18°
- 9°
- 36° (correct)
In an electromechanical energy conversion device, what does the developed torque depend upon?
In an electromechanical energy conversion device, what does the developed torque depend upon?
- stator field and rotor field strengths and the torque angle (correct)
- stator field and rotor field strengths
- stator field strength and torque angle
- rotor field strength only
What is the likely number of poles on the rotor of an elementary cylindrical machine?
What is the likely number of poles on the rotor of an elementary cylindrical machine?
- six
- four (correct)
- one
- two
What is a common application of stepper motors?
What is a common application of stepper motors?
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?
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?
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?
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?
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?
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?
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?
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?
What is the relationship between the energy stored in the magnetic field and the number of turns of a coil?
What is the relationship between the energy stored in the magnetic field and the number of turns of a coil?
What is the unit of measurement for the core flux?
What is the unit of measurement for the core flux?
Flashcards
Instantaneous Power Factor Angle
Instantaneous Power Factor Angle
The angle related to the power factor when power is negative for 2 milliseconds.
Torque in Electromechanical Device
Torque in Electromechanical Device
Developed torque depends on stator and rotor field strengths and torque angle.
Rotor Poles in Cylindrical Machine
Rotor Poles in Cylindrical Machine
The likely number of poles on the rotor of an elementary cylindrical machine.
Applications of Stepper Motors
Applications of Stepper Motors
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Turns in a Coil
Turns in a Coil
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Energy Stored in a Coil
Energy Stored in a Coil
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Induced EMF Calculation
Induced EMF Calculation
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Peak Flux Density
Peak Flux Density
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Energy and Turns Relationship
Energy and Turns Relationship
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Core Flux Unit
Core Flux Unit
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