NCCER electrical Level 2 Module 2 Verified Guide

NCCER electrical Level 2 Module 2 Verified Guide 1. What voltage threshold requires guarding for exposed live parts? - Exposed live parts must be guarded if they operate at 50V or more between terminals. 2. Which type of equipment is most likely to utilize dynamic braking? - Forklifts often use dynamic braking. 3. At startup, what percentage of its full-load torque does a DC series motor generate? - A DC series motor develops 500% of its full-load torque at startup. 4. What factor determines the speed of an AC motor with a fixed number of poles? - The speed is determined by the motor's frequency. 5. Which type of motor is preferred for applications needing high starting torque along with speed control? - A compound motor is used where high starting torque and speed control are necessary. 6. What is the synchronous speed of a four-pole, 60Hz induction motor? - It operates at a synchronous speed of 1,800 rpm. 7. How can slip in an induction motor be defined? - Slip is described as the difference between the synchronous speed and the rotor speed. 8. Which class of motors operates on the principle of a rotating magnetic field? - Induction motors operate based on this principle. 9. What does horsepower measure regarding a motor? - It is used to rate the output capacity of a motor. 10. How many motor designs does the National Electrical Manufacturers Association (NEMA) specify? - NEMA designates 5 motor designs. 11. In a split-phase motor, how does the starting current compare to the full-load current? - The starting current is 6 to 8 times greater than the full-load current. 12. Which single-phase motor type exhibits the highest starting torque? - The capacitor-start motor has the highest starting torque. 13. What is the purpose of a wound rotor induction motor? - It is utilized for speed control and limiting starting current. 14. What characteristics are true for shaded-pole motors? - They have low starting torque, low efficiency, and high noise levels. 15. How does horsepower behave with a constant-torque load? - Horsepower increases and decreases in direct proportion to speed. 16. How is speed varied on a DC shunt motor? - Speed is adjusted by changing the voltage and current on the field winding or the armature. 17. According to NEMA, which motor would be classified as an open type? - An example of an open motor is a leather-protected motor. 18. What information can typically be found on a motor's nameplate? - The motor's FLA rating (full-load amperage) is located on its nameplate. 19. What does the RPM value on nameplates represent? - It indicates the rated full-load speed of the motor. 20. A wound rotor motor is rotating in the wrong direction; how should the leads be connected to correct this? - To fix the rotation, connect L1 to T1, L2 to T3, and L3 to T2. 21. Which type of motors maintain a constant speed from no load to full load? - Synchronous motors provide constant speed across these load conditions. 22. What is the most common service factor found on a motor's nameplate? - The typical service factor is 1.15. 23. What does NEC Article 430 address? - It covers motor application and installation. 24. In a DC motor, what is represented by the stationary magnet? - The stationary magnet is indicated by the field poles. 25. Which motor type is best suited for applications requiring adjustable speeds? - The ideal choice is a DC motor. 26. For a three-phase squirrel cage induction motor, how is speed controlled? - The speed is controlled by the frequency of the applied voltage and the number of poles.