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26309-11 Motor Calculations

1. What is the synchronous speed of a 60Hz induction motor with four stator poles?

Question 1 of 25

2. If a 480V, three-phase motor control center feeds a 50hp motor (65A), a 40hp motor (52A), and a 10hp motor (14A), the minimum feeder ampacity is ________.

Question 2 of 25

3. The rotating speed of an induction motor is determined by the number of stator poles and the ________.

Question 3 of 25

4. When used for short circuit protection of motor branch circuits, which of the following must be adjustable and used in conjunction with combination motor starters?

Question 4 of 25

5. For ordinary motors, the short-circuit/ground-fault protection for nontime-delay fuses are sized at what percentage of the motor full current?

Question 5 of 25

6. All motor circuits contain ________.

Question 6 of 25

7. In addition to short circuit protection, MSCPs may also serve as a ________.

Question 7 of 25

8. If the total resistance of two motor windings connected in parallel is 20V and 280V is applied to the circuit, how much current will flow?

Question 8 of 25

9. Good electrical protection for a motor includes both proper overload protection and ________.

Question 9 of 25

10. Which of the following is considered to be one of the NEC® required categories of motor protection?

Question 10 of 25

11. In certain motor circuits, one switch can serve as both the controller and the ________.

Question 11 of 25

12. The most effective method of power factor correction is the installation of ________.

Question 12 of 25

13. The synchronous speed of a 60Hz motor with two poles is ________.

Question 13 of 25

14. One of the three factors that will cause a three-phase motor's magnetic field to rotate is that the ________.

Question 14 of 25

15. The requirements for torque motors, shaded-pole motors, permanent split capacitor motors, and AC adjustable-voltage motors can be found in ________.

Question 15 of 25

16. If a motor has a current draw of 20A at 240V, what will the amperage be if 480V is applied?

Question 16 of 25

17. To calculate the maximum safe load that a motor may be expected to carry continuously at its rated voltage and frequency, the service factor is multiplied by the ________.

Question 17 of 25

18. The maximum recommended size of a dual-element, time-delay fuse for a 50hp, 460V, three-phase motor rated at 65 FLA is ________.

Question 18 of 25

19. Which of the following lists the full-load currents for three-phase motors with a known winding type, horsepower, and voltage?

Question 19 of 25

20. The requirements for sizing multi-motor branch circuits can be found in ________.

Question 20 of 25

21. Installation of capacitors on induction motors will ________.

Question 21 of 25

22. Which of the following describes MSCPs?

Question 22 of 25

23. If the total resistance of two motor windings connected in parallel is 24Ω and 240V is applied to the circuit, how much current will flow?

Question 23 of 25

24. Which of the following is true concerning the starting current of an induction motor at the moment the circuit is energized?

Question 24 of 25

25. What is the maximum value for short circuit protection for multi-motor branch circuits?

Question 25 of 25


 

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