Electrician Motors and Controls

Question 1

What NEC article covers the installation of motors, motor circuits, and controllers?

Accepted Answer

Article 430

Answer

Article 410

Answer

Article 440

Answer

Article 450

Question 2

What is the purpose of a motor starter?

Accepted Answer

To limit inrush current and provide overload protection when starting a motor

Answer

To convert AC power to DC for the motor

Answer

To increase motor speed above nameplate rating

Answer

To measure motor power consumption

Question 3

According to the NEC, motor branch circuit conductors must be sized at what minimum percentage of the motor's full-load current (FLC)?

Accepted Answer

125%

Answer

100%

Answer

115%

Answer

150%

Question 4

What is the function of a thermal overload relay in a motor control circuit?

Accepted Answer

To protect the motor windings from excessive heat due to overload

Answer

To start the motor remotely

Answer

To reverse motor direction

Answer

To vary motor speed

Question 5

What type of motor uses both a start winding and a run winding?

Accepted Answer

Single-phase split-phase motor

Answer

Three-phase induction motor

Answer

DC shunt motor

Answer

Synchronous motor

Question 6

What is the maximum rating of an inverse time circuit breaker used to protect a motor branch circuit per the NEC?

Accepted Answer

250% of motor FLC

Answer

115% of motor FLC

Answer

125% of motor FLC

Answer

150% of motor FLC