True/False
Indicate whether the
statement is true or false.
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1.
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The wound rotor motor has a lower starting torque per amp of starting current
than any other type of three phase motor.
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2.
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The wound rotor motor can be started in multiple steps to provide smooth
acceleration from 0 RPM to maximum RPM.
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3.
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Small wound rotor motors are often controlled manually by a three-pole
make-before-break rotary switch.
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4.
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Starting circuits generally employ resistors of a lower wattage value than
circuits that are intended for speed control.
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5.
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Capacitive reactance is proportional to the rotor frequency.
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Completion
Complete each
statement.
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6.
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The wound rotor induction motor is often called the ____________________
motor.
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7.
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Maximum torque is developed when the ____________________ of the stator and
rotor are in-phase with each other.
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8.
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The operating characteristics of a wound rotor motor with the rotor leads
shorted together are very similar to those of a(n) ____________________ motor.
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9.
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The difference between rotor speed and synchronous speed is called
____________________.
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10.
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In an alternating current circuit, the current limiting effect of a capacitor is
called ____________________.
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Short Answer
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11.
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How is the construction of the rotor different between the wound rotor induction
motor and the squirrel cage motor?
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12.
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What are the three factors that determine the amount of torque developed by a
three phase induction motor?
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13.
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How is the starting current and speed of a wound rotor induction motor
controlled?
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14.
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What is the principle on which frequency control operates?
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15.
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What is one advantage and one disadvantage of frequency control?
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