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One method of providing plugging control is with the use of an automatic timed circuit.

A) True
B) False

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What are the three factors that determine induced voltage?

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The three factors are: strengt...

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____________________ is defined by NEMA as a system of braking, in which the motor connections are reversed so that the motor develops a counter torque that acts as a retarding force.

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When a generator produces electrical power, it produces ____________________, making the armature hard to turn.

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The principle of dynamic braking for a direct current motor is to change the motor into a(n) ____________________.

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How is plugging accomplished with three phase motors?

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Plugging is accomplished with ...

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Dynamic braking circuits for alternating current motors generally include a(n) ______________________________ to lower the voltage to the rectifier.

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step-down-transforme...

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Mechanical brakes can be obtained in two basic types: drum and ____________________.

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How is dynamic braking for a DC motor accomplished?

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Dynamic braking for a DC motor...

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Dynamic braking for a DC motor is very effective, but the braking effect becomes weaker as the armature slows down.

A) True
B) False

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True

Plugging is used with direct current motors more than with three phase squirrel cage motors.

A) True
B) False

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False

Mechanical type brakes cannot hold a suspended load.

A) True
B) False

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Figure 30-2 Figure 30-2 -In the accompanying figure, the brake is applied automatically when the motor is not operating. -In the accompanying figure, the brake is applied automatically when the motor is not operating.

A) True
B) False

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What is the most accurate method of plug stopping a motor?

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The most accurate method of plug stopping a motor is with a plugging switch or zero speed switch.

Why is dynamic braking sometimes referred to as magnetic braking?

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Dynamic braking is sometimes r...

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Showing 1 - 15 of 15

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