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