NEIEP 820: Questions & Answers
Why are frequent inspections of line starter contractors necessary?(Ans- High current causes contact arcing.
During hydraulic pump motor starting which of the following is true?(Ans- Line current is high
In order to take advantage of wye-delta starting for a pump unit what is required?(Ans- Two line starters
Why is it important to only operate line starters with their covers in the proper location?(Ans- To prevent flashover between contacts
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.
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
Of the following items which has the greatest effect on the leveling accuracy of a hydraulic elevator?(Ans- Oil temperature
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 of belt span.
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