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NCCER Electrical Level 2 Module 2 Motors: Theory and
Application With 100% SURE ANSWERS
Terms in this set (91)
Magnetic lines of force are continuous and always form closed loops; Magnetic lines of force
How DC motors operate?
do not cross.
Armature The rotating windings of a DC motor.
Commutator A device used on electric motors or generators to maintain a unidirectional current.
_ __ is produced by mounting a loop in a fixed magnetic field and as long as the fields of the
Torque
magnet and armature interact.
The rated output capacity of the motor. It is based on breakdown torque, which is the
horsepower
maximum torque a motor will develop without an abrupt drop in speed.
A____ is produced by the fields poles, and a loop of wire in the armature turns and cuts this
magnetic field
magnetic field.
NCCER Electrical Level 2 Module 2 Motors: Theory and Application
1/7
, 10/9/24, 1:24 PM
Shunt
Types of DC motors Series
Compound
Types of AC motors Synchronous and Induction (Single and Polyphase)
Periodic duty: (Definition) Intermittent operation at a substantially constant load for a short and definitely specified time.
The approximate full-load speed at the rated power line frequency. The speed of a motor is
Revolutions per minute (rpm)
determined by the number of poles in the winding.
For single-phase motors, the standard rotation, unless otherwise noted, is counterclockwise
Rotation facing the lead or opposite shaft end. All motors can be reconnected at the terminal board for
opposite rotation unless other wise indicated.
The speed of the revolving field of the stator, which is dependent on the supply frequency and
Synchronous speed
number of poles in a stator winding.
Field poles The stationary portion of a DC motor that produces the magnetic field.
The principle reason for developing the eliminate commutator problems
brushless DC motor was to ___.
The electrical energy required to produce 1hp of 746W
mechanical energy is _.
When there is a wide variation in both torque series DC motor
and speed requirements, such as a blower or
hoist, use a _.
The name of the stationary motor part that stator
produces the magnetic field during operation is
the ____.
The rpm of a 60Hz motor with two poles is ___. 3,600rpm
In three-phase motors, the rotor most commonly squirrel cage rotor
used is the _ _.
The starting torque characteristics of a wound- rotor resistance
rotor motor are defined by _.
A three-phase synchronous motor is started with amortisseur winding
a(n) __ _. NCCER Electrical Level 2 Module 2 Motors: Theory and Application
2/7
NCCER Electrical Level 2 Module 2 Motors: Theory and
Application With 100% SURE ANSWERS
Terms in this set (91)
Magnetic lines of force are continuous and always form closed loops; Magnetic lines of force
How DC motors operate?
do not cross.
Armature The rotating windings of a DC motor.
Commutator A device used on electric motors or generators to maintain a unidirectional current.
_ __ is produced by mounting a loop in a fixed magnetic field and as long as the fields of the
Torque
magnet and armature interact.
The rated output capacity of the motor. It is based on breakdown torque, which is the
horsepower
maximum torque a motor will develop without an abrupt drop in speed.
A____ is produced by the fields poles, and a loop of wire in the armature turns and cuts this
magnetic field
magnetic field.
NCCER Electrical Level 2 Module 2 Motors: Theory and Application
1/7
, 10/9/24, 1:24 PM
Shunt
Types of DC motors Series
Compound
Types of AC motors Synchronous and Induction (Single and Polyphase)
Periodic duty: (Definition) Intermittent operation at a substantially constant load for a short and definitely specified time.
The approximate full-load speed at the rated power line frequency. The speed of a motor is
Revolutions per minute (rpm)
determined by the number of poles in the winding.
For single-phase motors, the standard rotation, unless otherwise noted, is counterclockwise
Rotation facing the lead or opposite shaft end. All motors can be reconnected at the terminal board for
opposite rotation unless other wise indicated.
The speed of the revolving field of the stator, which is dependent on the supply frequency and
Synchronous speed
number of poles in a stator winding.
Field poles The stationary portion of a DC motor that produces the magnetic field.
The principle reason for developing the eliminate commutator problems
brushless DC motor was to ___.
The electrical energy required to produce 1hp of 746W
mechanical energy is _.
When there is a wide variation in both torque series DC motor
and speed requirements, such as a blower or
hoist, use a _.
The name of the stationary motor part that stator
produces the magnetic field during operation is
the ____.
The rpm of a 60Hz motor with two poles is ___. 3,600rpm
In three-phase motors, the rotor most commonly squirrel cage rotor
used is the _ _.
The starting torque characteristics of a wound- rotor resistance
rotor motor are defined by _.
A three-phase synchronous motor is started with amortisseur winding
a(n) __ _. NCCER Electrical Level 2 Module 2 Motors: Theory and Application
2/7
