Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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A DC shunt motor has the field windings connected _______________ with the
armature.
a. | in parallel | d. | All of these | b. | in series | e. | None of these | c. | in
combination |
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2.
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If the shunt field is connected to the same power supply as the armature, the
motor is connected in the _______________ configuration.
a. | separately-excited | c. | self-excited | b. | differential | d. | compound |
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3.
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The primary advantage of a DC shunt motor is that it provides excellent
_____________.
a. | starting torque | c. | efficiency | b. | speed control | d. | overheating
protection |
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4.
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Which of the following statements is false about a separately-excited shunt
motor?
a. | The shunt field is connected to a different power supply than the
armature. | d. | All of these | b. | It allows you to vary the speed by varying the
current. | e. | None of
these | c. | It requires only one power supply. |
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5.
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Which of the following is an application for a DC shunt motor?
a. | Centrifugal Pump | d. | All of these | b. | Cooling Fan | e. | None of these | c. | Woodworking
Machinery |
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6.
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Which of the following statements is not true of a DC compound motor?
a. | It has a field connected in series with the armature. | c. | Both fields are connected in
parallel with the armature. | b. | It has a field connected in parallel with the
armature. | d. | It has two
configurations in which it can be connected. |
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7.
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The primary advantage of a DC compound motor is ___________.
a. | it provides a middle ground between a series and a shunt motor. | c. | it provides
excellent speed control | b. | it provides high starting
torque | d. | it is very
efficient |
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8.
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When a shunt field is connected to a different power supply than the armature,
it is called a(n) ____________ shunt field.
a. | compound | c. | separately-excited | b. | differential | d. | inverted |
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9.
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Which of the following is an application of a DC compound motor?
a. | Conveyers | d. | All of these | b. | Punch Press | e. | None of these | c. | Bending
Machines |
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10.
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A ____________ compound configuration is created by connecting the series and
the shunt windings so that their magnetic fields have the same magnetic polarity.
a. | differential | c. | cumulative | b. | self-excited | d. | compound |
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Matching
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SEGMENT 1
a. | maintain | e. | self-excited | b. | armature | f. | parallel | c. | runaway | g. | does | d. | does not |
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11.
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A DC shunt motor has its field windings connected in _________ with the
armature.
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12.
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An advantage of a self-excited DC shunt motor is that it is able to __________
its speed over a wide load range.
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13.
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A DC shunt motor ____________ (does or does not) provide high starting torque.
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14.
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A DC shunt motor will not ___________ if there is no load connected to it,
unlike a DC series motor.
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15.
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When the shunt field is connected to the same power supply as the armature, it
is called a ___________ shunt field.
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16.
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The ____________ windings have much less resistance than the field windings.
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SEGMENT 2
a. | above | d. | armature current | b. | increases | e. | separately-excited | c. | field
weakening | f. | armature |
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17.
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When a separate power supply is used for the shunt field, it is called a
__________ shunt field.
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18.
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One major advantage of a separately-excited shunt motor is that the motor can
be operated ________ is rated nameplate speed.
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19.
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When a DC motor is connected in the separately-excited configuration, as the
field current is decreased, the motor speed ________.
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20.
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The direction of rotation on a DC shunt motor can be reversed by either
reversing the field connections or the ___________ connections.
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21.
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The process of reducing the field current of a separately-excited shunt motor
is called ___________.
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22.
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The maximum speed of a self-excited shunt motor is determined by the
___________.
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SEGMENT 3
a. | speed | d. | armature | b. | cummulative | e. | higher | c. | differential | f. | compound |
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23.
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A DC _________ motor is a motor with a field connected in both series and in
shunt with the armature.
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24.
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A DC compound motor provides ____________ starting torque than a shunt
motor.
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25.
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A DC compound motor provides better __________ control than a series motor.
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26.
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If the series and shunt windings in a compound motor are connected so that
their magnetic fields have the same polarity, the motor is configured as a __________ compound motor.
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27.
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The _______ compound motor has very few applications and is avoided for the
most part.
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28.
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The only sure method to revers the direction of rotation on a cummulative
compound motor is to reverse the ________ connections.
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