Exam 18: Single-Phase Motors

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What are the two main types of single-phase induction motors?

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There are two main types of single-phase induction motors: the resistance-start, induction-run motor and the capacitor-start, induction-run motor.

When stepping motors are used as two-phase synchronous motors, they have the ability to virtually start, stop, or reverse direction of rotation instantly.

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What is the theory of operation for stepping motors?

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Stepping motors operate on the theory that like magnetic poles repel and unlike magnetic poles attract.

Describe stepping motors that are operated on ac voltage.

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A(n) ____________________ network can be used to provide the 90° phase shift needed to change single-phase ac into two-phase ac.

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As the current in the stator circuit increases, the stator ____________________ also increases.

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Stepping motors are devices that convert mechanical movement into electrical impulses.

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The term ____________________ means that there are two windings wound together.

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What are the basic parts of a resistance-start, induction-run motor?

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The rotor of the resistance-start, induction-run motor is the same as that of a three-phase, squirrel-cage induction motor.

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Describe a bifilar stepping motor.

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In the ____________________ method, an additional compensating winding is placed in slots cut in the pole faces.

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Universal motors operate at different speeds on dc and single-phase ac.

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A repulsion-induction motor has nearly the same operating characteristics as a repulsion-start, induction-run motor, but this type of motor has no ____________________ mechanism.

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Most single-phase motors have fractional horsepower ratings.

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