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

Question 2 of 15

3. Absorption current consists of polarization current and ________.

Question 3 of 15

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

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 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 6 of 15

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

Question 7 of 15

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

Question 8 of 15

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

Question 9 of 15

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

Question 10 of 15

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

Question 11 of 15

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

Question 12 of 15

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

Question 13 of 15

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

Question 14 of 15

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

Question 15 of 15


 

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