NCCER 26206-20 PRACTICE SCRIPT 2026
QUESTIONS WITH SOLUTIONS GRADED
A+
>> Due to the absence of any moving electrical contacts, which type of motor
should be used where the motor is exposed to flammable dust or gas?
Answer: Squirrel induction motor
>> What type of motor can be easily reversed by switching two of the leads?
Answer: Three phase induction motor
>> According to NEMA definitions, what are the types of totally enclosed
motors
Answer: There are 8 types. Non-ventilated, fan-cooled, fan-cool-guarded,
explosion-proof, dust- and ignition-proof, pipe-ventilated, water-cooled, and
water-to-air-cooled
>> What motor should be used for applications that require frequent starts
without overheating the motor?
Answer: Wound rotor induction motor
>> A motor enclosure that minimizes the entrance of rain and airborne particles
to the electrical parts is considered?
Answer: Weather protected
>> A three phase induction motor may have
Answer: any number of even poles
>> A three phase synchronous motor has three starter windings that are____.
, Answer: 120 degrees apart
>> The NEC requires motor disconnecting means be_____.
Answer: Within sight of the controller
>> DC injection breaking is used on____.
Answer: High speed and high inertia loads
>> The speed of a three phase squirrel cage induction motor is controlled by the
frequency of the applied voltage and _____?
Answer: Number of poles
>> What motor is the best installation choice for an application requiring
adjustable speeds?
Answer: DC motors
>> The stationary magnet of a DC motor is represented by the _____.
Answer: Field poles
>> NEC article 430 covers _____.
Answer: Installation of motors, motor circuits, and motor control
connections, including conductors, short circuit and ground fault protection,
starters, disconnects, and overload protection.
>> The most common service factor appearing on a motor nameplate is_____?
Answer: 1.15
>> What motor provides constant speed from no-load conditions to full-load
conditions?
Answer: Synchronous motors
QUESTIONS WITH SOLUTIONS GRADED
A+
>> Due to the absence of any moving electrical contacts, which type of motor
should be used where the motor is exposed to flammable dust or gas?
Answer: Squirrel induction motor
>> What type of motor can be easily reversed by switching two of the leads?
Answer: Three phase induction motor
>> According to NEMA definitions, what are the types of totally enclosed
motors
Answer: There are 8 types. Non-ventilated, fan-cooled, fan-cool-guarded,
explosion-proof, dust- and ignition-proof, pipe-ventilated, water-cooled, and
water-to-air-cooled
>> What motor should be used for applications that require frequent starts
without overheating the motor?
Answer: Wound rotor induction motor
>> A motor enclosure that minimizes the entrance of rain and airborne particles
to the electrical parts is considered?
Answer: Weather protected
>> A three phase induction motor may have
Answer: any number of even poles
>> A three phase synchronous motor has three starter windings that are____.
, Answer: 120 degrees apart
>> The NEC requires motor disconnecting means be_____.
Answer: Within sight of the controller
>> DC injection breaking is used on____.
Answer: High speed and high inertia loads
>> The speed of a three phase squirrel cage induction motor is controlled by the
frequency of the applied voltage and _____?
Answer: Number of poles
>> What motor is the best installation choice for an application requiring
adjustable speeds?
Answer: DC motors
>> The stationary magnet of a DC motor is represented by the _____.
Answer: Field poles
>> NEC article 430 covers _____.
Answer: Installation of motors, motor circuits, and motor control
connections, including conductors, short circuit and ground fault protection,
starters, disconnects, and overload protection.
>> The most common service factor appearing on a motor nameplate is_____?
Answer: 1.15
>> What motor provides constant speed from no-load conditions to full-load
conditions?
Answer: Synchronous motors
