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Exam 9: Magnetic Motor Starters

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Question 1

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A manual motor starter is a device where the _______________ contacts that actually energize the motor load are manually operated by hand.

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power

Question 2

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The _______________ motor starter combines all of the necessary control and protection components in one cabinet.

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Question 3

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The most common platform for electric motor starters in large commercial or industrial applications is the ____.

Manual motor starters are also capable of remote control operation.

The stator unit is the component that directly energizes and de-energizes the motor load.

Combination motor starters are found primarily in large commercial and industrial installations.

The switch contacts are a mechanical linkage function, and they will remain closed in the case of ____.

Describe a manual motor starter.

Manual motor starters are limited to small, normally fractional horsepower motors, and it would be rare to find them controlling motors greater than _______________ horsepower.

Motor Control Centers are found in smaller commercial installations.

The ____ is designed to measure the running load current of the motor, and open the contactor unit to stop the motor in the event the motor draws current levels that could cause damage from excessive heat.

Every electric motor must have a(n) ____.

In addition to the MCC bucket and the combination types, motor starters can be found as _______________ components.

Manual motor starters provide protection from automatic restart when power is restored after a power outage.

Manual motor starters are not capable of ____ operation because the contacts are mechanically linked to the start and stop buttons, so the operator must control the motor from the starter location.

Describe two of the four drawbacks in using manual motor starters rather than magnetic motor starters.

The control circuit is present on both the contactor unit and the overload unit.

Motor starters are the combination of a contactor unit and an overload unit, connected to function as a single unit.

____ control contacts are not provided to control auxiliary equipment, because manual motor starters cannot use them.

The power circuit is present on both the contactor unit and the overload unit.