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AC_DC Machines Final Exam Review Flashcards _ Quizlet (2).pdf
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9/3/24, 11:51 AM AC/DC Machines Final Exam Review Flashcards | QuizletScience Engineering Electrical Engineering
AC/DC Machines Final Exam Review
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Terms in this set (186)
False A DC generator always has a rotating field and a stationary armature.
A DC motor can be made into a DC generator if an external prime mover is coupled to the motor
True
shaft.
A DC motor can be reversed by changing the polarity of both the armature winding and the field
False
winding.
A DC shunt motor can be run above its full-voltage base speed by reducing the current in the
True
shunt fields.
True A DC shunt motor has lower starting torque than a DC series motor.
field frame A ___ is the stationary part in a DC motor or generator.
DC permanent-magnet A ___ motor is a motor that uses magnets, not a coil of wire, for the field windings.
A ___ motor is a motor where the current flows in the opposite direction in the series and shunt
DC differential-compounded
coils and the resulting net flux is the difference between the two fluxes.
d. all of the above A ___-wound generator is a type of DC generator.
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, 9/3/24, 11:51 AM AC/DC Machines Final Exam Review Flashcards | Quizlet
True A benefit of DC generators is their ability to increase the voltage under changing load conditions.
A(n) ___ is a machine that uses DC connected to the field windings and armature to produce shaft
direct-current motor
rotation.
A(n) ___ is a voltage induced in the windings that is opposite in polarity to that of the power
countervoltage
supply.
A(n) ___ is the rotating part of a DC motor, consisting of the laminated core with slots for the coils,
armature
the main shaft, and the commutator and brushes.
shunt A(n) ___ motor is a DC motor that has the field wiring connected in parallel with the armature.
Because they cannot overheat, all DC permanent-magnet motors are designed to run
False
continuously.
True DC generators consist of field windings, an armature, a commutator, and brushes.
True DC motors perform better than AC motors in most traction equipment applications.
DC series motors are used where constant or adjustable speed is required and starting
False
conditions are moderate.
False DC series motors can develop only about 125% of full-load torque upon starting.
In a ___, the series field windings and shunt field windings are combined in a manner to take
compound-wound generator
advantage of the characteristics of each.
Since each DC source has one positive and one negative terminal, there must be at least two
True
brushes and two brush holders.
The ___ is a line through the armature cross section that is perpendicular to the maximum amount
neutral plane
of magnetic flux.
all of the above The basic types of DC motors are DC series motors and ___ motors.
The commutators are magnets or stationary windings used to produce the magnetic field in an
False
alternator or motor.
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