Nccer Electrical Module 2 Level 2 Motors Theory and Application Exam Questions & Answers

Nccer Electrical Module 2 Level 2 Motors Theory and Application Exam
Questions & Answers
How DC motors operate?

Correct Answer: Magnetic lines of force are continuous and always form closed

loops; Magnetic lines of force do not cross.



Armature: (Definition)

Correct Answer: The rotating windings of a DC motor.


The ____ is a movable electromagnet located between the poles of another fixed
permanent (field) magnet as shown.

Correct Answer:
Armature


A twisting force called ______ must be developed. _____ is produced by mounting a

loop in a fixed magnetic field and as long as the fields of the magnet and armature

interact.


Correct Answer: Torque


Commentator: (Definition)

Correct Answer: A device used on electric motors or generators to maintain a

unidirectional current.




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, In the neutral plane, no ____ is produced and the rotation of the armature should stop

Correct Answer:
Torque


A _____ is produced by the fields poles, and a loop of wire in the armature turns and
cuts this magnetic field.

Correct Answer: Magnetic
field


CEMF

Correct Answer: Counter electromotive force (CEMF)


Horsepower: (Definition)

Correct Answer: The rated output capacity of the motor. It is based on breakdown

torque, which is the maximum torque a motor will develop without an abrupt drop in

speed.




Horsepower: (Equation)

Correct Answer: Hp=
Watts/746

Types of DC motors

Correct Answer: Shunt

Series




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