THAT is a good link. I did OK, missed a couple on that one, more on the
Try these too:
Well, you get the picture...
3 of the answers are wrong for the second test:
19. I've measured parasitic loads of well over 100mA, and they didn't
say that early 1980s cars were specifically exluded.
10, 22. They assumed that all analog meters were the low-imedance
type, but they're ignoring FET-VOMs, which have input impedances of 10
megaohms, just like digital meters. I have a Triplett Micropower and
a Radio Shack VOM modified with a FET amplifier, and Protek still
sells an analog FET-VOM. I can't always use a digital meter because
often give grossly wrong errors at even moderately high frequencies.
On the other hand I missed 6 on the first test:
4. I assumed that the normal acid concentration was 75% (really stupid
since choosing the right answer for the question #1 revealed it);
12. 5 seconds seemed too short for a load test since batteries are
specified for 30 seconds, and I can't believe that overheating would
be a problem
15. I didn't know that 12.2V was 50% charge
21. I thought that a battery that dipped to 8.9V on load test could be
24. Midtronics? I never heard of that company.
26. I didn't know the normal color of the Delco hydrometer eye since
there is no eye on the Wal-mart versions, and the only one I had would
be either green (OK), red (weak), or clear (dead). This was a
Japanese battery, and the hydrometer could be unscrewed and placed
into any other cell.
Question #26 appears to be incorrect. It sez:
An AC Delco battery with a built in hydrometer is being checked. Technician
A says that a DARK GREEN eye indicates the battery is sufficiently charged
for further testing. Technician B says that a CLEAR hydrometer eye means the
battery must be replaced.
And the correct answer is supposed to be "B". "Correct. A clear or light
yellow hydrometer eye indicates the battery is low on electrolyte and should
However, that indictor is NOT a hydrometer, it is an electrolyte level
indicator. Therefore, the answer "B" is incorrect. Indeed, the earlier
Question #17 correctly defines what a hydrometer is:
"Correct, a hydrometer is used to measure the specific gravity of the
Anybody here old enough to remember rechargeable batteries for radios that
had three different density balls floating in the electrolyte? (You could
judge the state of charge by noting which balls were floating.)
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