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21 Cards in this Set
- Front
- Back
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What are the advantages of a gel cell battery? |
-less maintenance -fewer OSHA hazzards -chepaper |
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What is the disadvantages of a gel cell? |
-shorter life span -harder to predict failure |
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what is crazing? |
small cracks on the outside od the battery. |
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What is bowing? |
Plates start to bow and can short out. |
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Draw a battery string? |
7812 6543 |
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What is the first cell in the string called? |
Office Ground. |
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What is the last cell in the string? |
-48 volts |
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Why -48 volts? |
Helps prevent corrosion. |
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What should the distance between DC power cables on the overhead runway? |
75 mm |
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Can you connect AC ground to Chassis ground? |
Yes but only in one place to prevent gound loops. |
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What is the minimum bend radius of copper. |
Equal to the thichness of the bar. |
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What is the minimum bend radius of Aluminum. |
Twice the thickness of the bar. |
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Why is there a difference between copper and aluminum bend radius. |
Alunminum is more brittle. |
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What is a secondary distirbution? |
a fuse panel or breakout panel. |
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What is a UPS? |
uninterrupted power supply. |
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Why are UPS used so offten? |
To keep servers running when the power is out. |
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A micro wind power system can put out how meany watts? |
less then100W |
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Mini wind power system puts out ________ Watts? |
100W to 100KW |
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Why is a tail vane used? |
To orientate blades perpendicular to the wind. |
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What is the minmun average speed a wind power system needs to make power? |
15km/hr |
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Why use 2 phase power? |
-less current for the same power -use smaller gauge wire to save money. -if it is true 2 phase, they're 120 degrees out of phase making it 208 volts |
