| 1. |
Separators are usually placed between opposing plates in leads acid cells to:
| A. |
prevent the electrodes from touching |
| B. |
prevent current flow through the cell |
| C. |
ensure that the positive and negative electrodes are connected |
| D. |
help with the polarization effect during discharge |
|
| 2. |
Gel-type and paste-type electrolytes have become common in lead-acid cells because they:
| A. |
allow the cells to be a larger physical size |
| B. |
spills and overflow from liquid types |
| C. |
generate extra voltages to assist the output |
| D. |
enable the chemical action to dissipate into the plates |
|
| 3. |
Look at the following diagram: 
With reference to the cut-away drawing of a lead-acid cell shown in figure 1, the space at the bottom of the plates is to:
| A. |
ensure that any sludge that form will combine with the plates |
| B. |
enable the electrolyte to form extra electrodes at the bottom |
| C. |
prevent any sludge formation from shorting the plates |
| D. |
prevent the electrolyte form touching the bottom of the plates. |
|
| 4. |
Generally speaking, the difference between a primary and secondary cells is that a secondary cell:
| A. |
is smaller for the same output capacity |
| B. |
will produce alternating current |
| C. |
has a liquid electrolyte |
|
| 5. |
To produce a higher output voltage cells are connected:
| C. |
with their positive terminals together |
| D. |
so that some are open circuited |
|
| 6. |
The number of 1.5 volt cells required to be connected in series to give an output of 9 volts is:
|
| 7. |
When two or more strings of cells, or batteries of cells, are connected in parallel in order to increase the available current, they are known as:
|
| 8. |
Thirty-six, 2 V, lead–acid cells have been connected in banks of batteries to produce a 24 V supply. The number of banks of batteries will be:
|
| 9. |
The ‘nominal voltage’ of a cell is the voltage that the cell should produce with:
| D. |
a small or nominal load connected |
|
| 10. |
The output voltage of a cell changes when a current is drown from the cell, due to the voltage drop across the:
| A. |
resistance of the connected load |
| B. |
internal resistance of the cell |
| C. |
inductance of the connected load |
| D. |
ac supply charging the cell |
|
| 11. |
The internal resistance of a cell will have a voltage drop across it that adds to the nominal voltage during the charging cycle and:
| A. |
adds to the nominal voltage during the discharge cycle |
| B. |
assists the nominal voltage during the discharge cycle |
| C. |
subtracts from the nominal voltage during the discharge cycle |
| D. |
subtracts from the nominal voltage during the charging cycle |
|
| 12. |
Look at the following diagram: 
With reference to the terminal voltage-drop chart shown in figure 2, if a load current of 40 A is drawn from a 12 V battery with an internal resistance of 0.05 W, then the terminal voltage will be:
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| 13. |
Generally, the energy that a cell can store depends on the type of cell chemically and the:
| A. |
physical size of the plates |
| B. |
type of positive terminal |
| D. |
current that the cell can deliver |
|
| 14. |
By convention, the energy stored in a cell is measured in:
|
| 15. |
The capacity of a lead-acid battery depends on the discharge rate of the battery. A high discharge rate:
| A. |
increases the storage capacity |
| B. |
will maintain a high storage capacity |
| C. |
decreases the storage capacity |
| D. |
improves the output voltage with each charge |
|
| 16. |
When mixed ready for use in a lead-acid battery, the specific gravity of the diluted sulphuric acid is:
|
| 17. |
Look at the following photo: 
With reference to figure 3, the picture shows a person carrying out:
| A. |
an electrolyte specific gravity test on a battery |
| B. |
a voltage test on a car battery |
| C. |
a current load test on a battery using a dummy load |
| D. |
an electrolyte voltage availability battery test |
|
| 18. |
The state of charge of a battery can often be determined from the:
| B. |
condition of the electrolyte |
| C. |
date code on the battery |
| D. |
no-load current level of the cells |
|
| 19. |
One type of battery that is rapidly degraded by excessive and repetitive deep discharges is:
| A. |
a stand-alone power supply battery |
| B. |
a rechargeable battery for a power tool |
| D. |
a battery for an electric vehicle |
|
| 20. |
Look at the following table: 
With reference to the specific energy table shown in figure 4, the type of cell with the highest energy per kilogram is:
| A. |
sealed zinc-mercury cell |
|
| 21. |
In automotive terms, the maximum current expected from a battery is called the:
| C. |
continuous cranking amps |
| D. |
crankcase consolidated alternator |
|
| 22. |
The efficiency of a battery can be determined using the formula,
percentage efficiency =
|
| 23. |
The cycle-life of a battery is the number of times they can be:
| A. |
used on an electric bicycle |
| B. |
recycled when no longer serviceable |
| C. |
discharged and recharged |
| D. |
used before damaging a battery power tool |
|
| 24. |
Some of the dangers that must not be ignored for when working with cells and batteries are:
| D. |
all of the given answers |
|
| 25. |
While charging, batteries can vent off a gas such as:
|
| 26. |
Lead-acid batteries and alkaline batteries should be kept separated, as the mixing of acids and alkaline can lead to:
| B. |
very volatile chemical reactions |
| C. |
increased output capacity in some types |
| D. |
decreased output voltage level in alkaline cells |
|
| 27. |
One maintenance procedure with wet cells is to regularly check the electrolyte level because if they are not kept covered they will:
| A. |
produce excessive voltage |
| B. |
increase the cell capacity |
| D. |
consume the electrolyte |
|
| 28. |
Cells that are getting old typically have:
| A. |
a higher output voltage |
| B. |
a lower internal resistance |
| C. |
larger amount of electrolyte |
| D. |
an increasing internal resistance |
|
| 29. |
The electrolyte in the zinc-alkaline cell is
| B. |
amalgamated zinc granules |
| C. |
compacted manganese dioxide |
|
| 30. |
In the zinc-mercury type of cell, the negative electrode is made from:
| A. |
of potassium hydroxide |
|
| 31. |
When compared with other types, the lithium cell’s output voltage tends to:
| A. |
increase at a slow rate over the cell’s lifecycle |
| B. |
decrease at a rapid rate over the cell’s lifecycle |
| C. |
remain more constant over the cell’s lifecycle |
| D. |
become unstable at different times over the cell’s lifecycle |
|
| 32. |
When compared with other types of cell of comparable size and weight, lead-acid cells can deliver:
| A. |
higher voltages for longer times |
| B. |
only about half the current of the others |
| C. |
full current for prolonged periods of time |
| D. |
higher current for short bursts |
|
| 33. |
As the active materials of a lead-acid cell have no rigid mechanical form or strength they are mounted in a lead grid. The grid usually has antimony added to the lead:
| A. |
for rigidity and extra mechanical strength |
| B. |
to help keep the internal resistance low |
| C. |
to increase the out capacity of the cell |
| D. |
in order to prevent polarisation during charging |
|
| 34. |
During the discharge cycle of a lead-acid cell, the sulphuric acid electrolyte ionises in the water to form positive hydrogen ions and:
| A. |
positive sulphur-dioxide ions |
| B. |
negative sulphate ions |
| C. |
positive sulphate ions |
|
| 35. |
Once a lead-acid cell is fully charged, the hydrogen and oxygen, being liberated cannot combine within the cell and:
| A. |
will now combine outside the cell |
| B. |
regenerate into the positive and negative electrodes |
| C. |
vent to the atmosphere as gas |
| D. |
assist with the depolarisation effect |
|
| 36. |
For successful operation, the sealed lead-acid cell must be charged at a rate that will:
| A. |
cause the gas to build up a good pressure within the cell |
| B. |
ensure that the gas pressure within the cell does not fall below the set level |
| C. |
enable the voltage on the plates to undergo a transfer characteristic effect |
| D. |
not cause any gas to build up excessive pressure within the cell |
|
| 37. |
One advantage of the lead-acid cell with a gel electrolyte is that they can be used:
| B. |
when completely discharged |
| C. |
for a longer period on high currents |
| D. |
when an ac supply is required |
|
| 38. |
There are two major types of nickel-alkaline cells. One has nickel-iron electrodes and the other has:
| A. |
nickel-lead electrodes |
| B. |
nickel-cadmium electrodes |
| D. |
pure alkaline electrodes |
|
| 39. |
One advantage of the nickel-metal hydride cell secondary cell is that it:
| A. |
has a limited shelf life |
| B. |
does not maintain a high output voltage during discharge |
| C. |
is capable of many charge/recharge cycles |
|
| 40. |
The modern fuel cell gives more energy per unit mass than a storage battery and in addition:
| A. |
the electrodes of platinum black undergo a chemical change |
| B. |
has the same output voltage as a lead-acid cell |
| C. |
is very inexpensive to manufacture |
| D. |
water is produced as a useful by product |
|
| 41. |
The main requirements for batteries for standby power supplies are they must have a long life with a low self-discharge rate and:
| A. |
lose a minimum of electrolyte over long periods |
| B. |
generate a good volume of hydrogen during charging |
| C. |
be able to be used in any position |
| D. |
have a robust construction so they can be frequently moved |
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