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Exam 14: Motor Starters

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Question 1

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Manual motor starters are used extensively on industrial machines.

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verified

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Question 2

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Solid-state reduced-voltage controllers provide smooth, stepless acceleration of a motor through the use of silicon-controlled _____________________.

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rectifiers

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____________________ overload relays are used when the control is located in a varying ambient temperature and the motor that it protects is in a constant ambient temperature.

One advantage of the ____ starter is the smooth acceleration.

In thermal protected overload relays, the thermal element is connected mechanically to a normally open contact.

The basic principle of the ____ starter is to apply a percentage of the total voltage to start.

In the ____ starter, there are two starters of equal size for a given horsepower motor application.

In the reversing starter, both mechanical and electrical interlocks are used to prevent both starters from closing their line contacts at the same time.

The ____________________ starter is often referred to as the "simple" type. This starter has one set of contacts that close when the starter coil is energized. When the contacts close, the motor is connected directly to the line voltage.

The motor starter is similar to the contactor in design and operation. The important difference is the ____.