Review For Test Instruments and Services

1. Test instruments are vital for accurate troubleshooting (page 367).

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2. Voltage unbalance will cause immediate motor failure (page 369).

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3. The microhmmeter can be used for comparison testing motors larger than 10 horsepower (page 372). T_ Fclip_image007

4. A tachometer can be used to determine whether a motor is overloaded (page 373). T_ Fclip_image009

5. The main use for the megohmmeter is to test insulation between the winding and the frame of a motor (pages 374-375). T_ Fclip_image011

6. An infrared gun (like a voltmeter) should be standard equipment in the toolbox (pages 376-377). T_ Fclip_image013

7. The electronic stethoscope can be used for preventive maintenance (page 377). T_ Fclip_image015

8. The surge tester is the only instrument that will reliably stress turn-toturn insulation (pages 378-379). T_ Fclip_image017

9. The polarization index test will work on all motors (pages 381-383).

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10. The polarization index test should be done immediately after a motor has been shut off (page 383). T_ Fclip_image021

11. The step voltage test will work on all motors (page 385). T_ Fclip_image023

12. The high-potential test voltage should never be applied to a winding when it is set at its full value (pages 385-386). T_ Fclip_image025

13. The high-potential test is done to check phase-to-phase insulation

(page 385). T_ Fclip_image027

14. 2 x rated voltage + 1000 volts for one minute is acceptable for all motors (page 385). T_ Fclip_image029

15. What are three signs of power quality problems (pages 386-388)?

16. Give two reasons for improving an industry’s power factor (pages 386-388).

17. Vibration analysis and balancing are limited to electric motors

(pages 388-389). T_ Fclip_image031

18. Laser alignment is the most reliable method to reduce coupling vibration (pages 389-390). T_ Fclip_image033

19. Particle analysis can predict bearing and gear problems in gearboxes

(page 390). T_ Fclip_image035

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