True/False
Indicate whether the
statement is true or false.
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1.
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Many autotransformer starters contain taps that can be set for 50, 65, or 80
percent of the line voltage.
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2.
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Wound rotor type motors and synchronous motors generally use autotransformer
starters.
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3.
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Most autotransformer starters use two transformers to reduce the voltage applied
to the motor during the period of acceleration.
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4.
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Autotransformer starters provide greater starting torque per ampere drawn from
the line than any other type of reduced voltage starter.
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5.
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For closed transition starting, four separate start contactors are used.
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Completion
Complete each
statement.
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6.
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____________________ starters are generally employed to start squirrel cage type
motors.
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7.
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Autotransformer starters are ____________________ type loads and will affect the
power factor during the starting period.
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8.
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If 50 percent of the normal voltage is connected to the motor, the in-rush
current will drop to ____________________ percent.
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Figure 25-1 
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9.
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The accompanying figure shows transformers connected in
open-____________________.
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10.
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Open transition starting is generally used on starters of size
____________________ and smaller.
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Short Answer
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11.
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How do autotransformer starters reduce the amount of in-rush current?
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12.
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In an autotransformer starter, what happens when the START button is
pressed?
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13.
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What are the two effects of reducing the voltage applied to the motor?
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14.
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What is meant by open transition starting?
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15.
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In closed transition starting, what is the role of three current transformers
(CTs) being used in the circuit?
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