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some objective questions on batteries

Battery electrolyte is a mixture of water and:

 Lead peroxide.
 Sulfuric acid.
 Lead sulfate.
 All of the above
Correct, a mixture of 64% Water and 36% Sulfuric Acid make up Battery Electrolyte.

The plates of a discharged battery are?

 Two similar metals in the presence of an electrolyte.
 Two similar metals in the presence of water.
 Two dissimilar metals in the presence of an electrolyte.
 Two dissimilar metals in the presence of water.
Correct, in a discharged battery both plates are Lead Sulfate in the presence of water.

The correct ratio of water to sulfuric acid in battery electrolyte is approximately:

 80 percent water to 20 percent sulfuric acid.
 65 percent water to 35 percent sulfuric acid.
 35 percent water to 65 percent sulfuric acid.
 20 percent water to 80 percent sulfuric acid.
Correct, a fully charged battery has electrolyte mixture of 65% water and 35% sulfuric acid.

A specific gravity of 1.170 to 1.190 at 80° F indicates that a battery's state of charge is approximately:

 75%
 50%
 25%
 10%.
Correct, a spicific gravity of 1.190 is 50% charged, 1.270 is 100% charged, and 1.100 is 0%.

Each cell of a fully charged six cell battery produces:

 1.75 volts
 4.2 volts
 1.2 volts
 2.1 volts
Correct, each cell produces 2.1 volts.  6 cells @ 2.1v = 12.6 volts

The capacity of a battery is determined by its:

 number of plates.
 size of plates.
 both a and b.
 neither a nor.
Correct, both the number and size of plates determine the surface area.

Battery corrosion may be cleaned with:

 water.
 a solution of baking soda and water.
 water and baking flower.
 kerosene.
Correct, a solution of baking soda and water will neutralize the battery corrosion.

To check for a battery drain, you would connect an ammeter between the:

 battery and alternator.
 battery (+) and (-) terminals.
 battery (+) terminal and ground cable.
 battery (-) terminal and ground cable.
Correct, placing an ammeter in series. Most cars will draw less than 35mA.

 In order to properly and accurately perform Heavy Load tests on batteries, the battery must be at least:

 50% charged.
 25% charged.
 100% charged.
 75% charged.
Correct, a battery less than 75% charge cannot be acurately tested and must be recharged.

 When performing a battery capacity (heavy-load) test on a 12-volt battery, the voltage should not fall below

 12.0 volts.
 10.6 volts.
 9.6 volts.
 8.6 volts.
Correct, replace battery if voltage drops below 9.6v.

 A battery heavy-load test discharges the battery for:

 5 seconds.
 10 seconds.
 15 seconds.
 20 seconds.
Correct, load test for no more than 15 seconds due to the heat.

The state of charge of a sealed battery is to be estimated based on its open-circuit voltage. A full-charged battery that has been standing for a few hours will have an open-circuit voltage of at least:

 12.6 volts.
 12.2 volts.
 11.5 volts.
 9.6 volts.
Correct, 12.6v = 100% charged, 12.4v = 75% charged, 12.2v = 50%, 12.0v = 25%,and 11.9 or less 0%

A battery that is undercharged for a long period of time will become:

 cycled.
 overheated.
 sulfated.
 none of the above.
Correct, The plates of a discharged battery are lead sufate in the presence of water.

The tester that discharges the battery at a high rate to determine its capacity is a:

 hydrometer.
 ammeter.
 load tester.
 none of the above.
Correct, load testing will determine the capacity of the battery to deliver proper current.


















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