True/False
Indicate whether the
statement is true or false.
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1.
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Motors that used a centrifugal switch to disconnect the start windings cannot be
used with variable voltage control.
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2.
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Double-face clutches have both the armature and field discs mounted on the same
hub.
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Figure 34-6 
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3.
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The accompanying diagram has a double-face magnetic clutch.
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4.
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Clutches cannot provide a smooth start for loads that can be damaged by sudden
starting, or for high inertia loads such as centrifuges or flywheels.
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5.
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The problem with eddy current clutch circuits is that they lack a speed sensing
device that automatically increases or decreases the DC excitation current when load is added or
removed.
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Completion
Complete each
statement.
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6.
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Motors that are intended to operate with variable voltage are designed with
____________________ stators.
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7.
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One method of obtaining a variable AC voltage is with the use of an
autotransformer with a sliding tap. The sliding tap causes a change in the turns ratio of the
____________________.
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8.
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A(n) ____________________ is a solid-state device similar to a silicon
controlled rectifier (SCR), except that it will conduct both the positive and negative portions of a
waveform.
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9.
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Only triac controls that are designed for use with ____________________ loads
should be used to control a motor.
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10.
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____________________ are used in applications where it is desirable to permit a
motor to reach full speed before load is applied.
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Short Answer
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11.
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What are the disadvantages of motors that contain high impedance stator
windings?
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12.
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What does the high impedance of the stator prevent?
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13.
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Magnetic clutches are divided into two primary sections. What are they?
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Figure 34-8 
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14.
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In the accompanying diagram, what do part A and part B show?
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15.
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What is the main advantage of an eddy current clutch?
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