| 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:
|
| 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 |
|
