ELM 124 Final Exam Study
Armature leads are labeled?
A1 & A2
What type of voltages are produced inside the rotating armature?
AC
In a compound DC motor control circuit, the field loss relay will disconnect the _____ if power is lost to the _____.
In a compound DC motor control circuit, the field loss relay will disconnect the _____ if power is lost to the _____.
How is the series field connected in relation to the armature?
Series
The speed regulation of a DC motor is proportional to the _____.
armature resistance
A force that tends to cause rotation is known as
torque
A series motor may be operated with no load connected.
False
A Medium voltage, Medium Current application would use what type of Armature winding
Frogleg wound
A device that converts mechanical energy to electrical energy is called a _____?
Generator
A Low Voltage, High Current application would use what type of Armature winding?
Lap Wound
What type of armature winding is connected in series?
Lap Wound
Series leads are labeled?
S1 & S2
What is must be done to compensate for Armature Reaction?
Set the Neutral plane
The DC motor, known as a "constant speed motor," is the _____ motor.
Shunt
When the field winding of a DC motor is connected in parallel with the armature, the motor is called a _____ motor.
Shunt
When a motor is connected differential compound, the _____ determines the direction of rotation of the motor at no load or light load.
Shunt Field
A series Generator is connected to a variable load. What do you expect to happen if the load increases?
Voltage decrease
A series Generator is connected to a variable load. What do you expect to happen if the load decreases?
Voltage decreases
A High Voltage, Low Current application would use what type of armature winding?
Wave Wound
The motor that does not contain a wound armature, commutator, or brushes is the _____ motor.
brushless DC
When a DC machine is used as a generator, the _______________ performs the function of a mechanical rectifier to change the AC produced in the armature into DC before it exits the machine through the brushes.
commutator
The compound motor connection that should generally be avoided is the _____. cumulative
differential
A compound motor has _____ field windings.
series and shunt
What is produce by the current flowing through the armature windings?
Countertorque
A device that converts electrical energy into mechanical energy is called a(n) _____.
Motor
Counter-electromotive force (CEMF) and back-EMF are names for the voltage induced into the armature of a DC motor.
Ture
Permanent magnet motors have _____ efficiency than conventional field-wound motors.
Higher