1.Why are frequent inspections of line starter contractors necessary?

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NEIEP 820

1.Why are frequent inspections of line starter contractors necessary?ANS High current causes contact arcing.

2.During hydraulic pump motor starting which of the following is true?ANS Line current is high 3.In order to take advantage of wye-delta starting for a pump unit what is required?ANS Two line starters 4.Why is it important to only operate line starters with their covers in the proper location?ANS To prevent flashover between contacts 1 / 2

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6 5.What is the operation quality of a soft start converter that prevents voltage sag and dimming of lights in a building often associated with hydro pump starting?ANS Starting current is maintained at a preset rate.

6.What is a special requirement for hydraulic elevator systems that use a flexible line installed in high pressure portions of the system?ANS Replacement at six-year intervals 7.Of the following items which has the greatest effect on the leveling accuracy of a hydraulic elevator?ANS Oil temperature 8.Which of the following statements best describes a proper maintenance operation for hydraulic pump belts?ANS A downward force with one finger should deflect a belt about 1/64 of an inch

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