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26410-11 Motor Operation and Maintenance

1. The recommended minimum polarization index for an AC motor is ________.

Question 1 of 15

2. Absorption current consists of polarization current and ________.

Question 2 of 15

3. The frequency and thoroughness of motor maintenance and testing depends upon the number of hours and days the motor operates, the importance of the motor, and the ________.

Question 3 of 15

4. In general, how much endplay should ball-bearing motors have?

Question 4 of 15

5. The useful life of a squirrel cage induction motor depends largely upon the condition of its ________.

Question 5 of 15

6. The polarization index is commonly used for motors over ________.

Question 6 of 15

7. NEMA's usual service conditions include a frequency variation of not more than what percentage of the nameplate frequency?

Question 7 of 15

8. Which of the following is the best instrument for testing for a grounded coil?

Question 8 of 15

9. NEMA's usual service conditions include an altitude limit of ________.

Question 9 of 15

10. Which of the following is used to check the rotating speeds of motors?

Question 10 of 15

11. Which of the following describes a finned air-over motor that powers and is cooled by the slipstream from a large fan?

Question 11 of 15

12. NEMA's usual service conditions include a voltage variation of not more than what percentage of the nameplate voltage?

Question 12 of 15

13. The frequency of motor lubrication depends on the type of bearing, motor application, and ________.

Question 13 of 15

14. When determining the polarization index on a 460V motor, which of the following test voltages should be applied between the winding and ground?

Question 14 of 15

15. Which of the following may be used to detect unusual bearing noise during rundown when the motor is powered down?

Question 15 of 15


 

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