
820 - Hydraulic Elevator Maintenance
Authored by Brant Trabel
Professional Development
Professional Development
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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why are frequent inspections of line starter contactors necessary?
Thermal overloads require constant care
High current causes contact arcing
High insulation failure rate
To maintain single phasing
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
During hydraulic pump motor starting, which of the following is true?
Oil immediately flows to the jack
Line current gradually builds
Pressure is not regulated
Line current is high
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In order to take advantage of Wye-Delta starting for a pump unit, what is required?
Two line starters
A two speed motor
An overload contactor
A faster style contactor
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it important to only operate line starters with their covers in the proper location?
To prevent flashover between contacts
To prevent arc shields from shorting contacts
To lower operating noise to a minimum
To hold contacts in proper alignment
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the operation quality of a soft starter converter that prevents voltage sags and dimming of lights in a building often associated with hydraulic pump starting?
DC conversion allows smooth starting
Starting current is maintained at a preset rate
Single phase, two phase and three phase transition
Lower belt slippage under heavy starting conditions
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a special requirement for hydraulic elevator systems that use flexible line installed in high pressure portions of the system?
Monthly inspection
Five year testing
Replacement at six-year intervals
Annual disassembly and inspection
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Of the following items, which has the greatest effect on the leveling accuracy of a hydraulic elevator?
Line voltage fluctuation
Condition of line starter contacts
Oil type and condition
Oil temperature
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