OBJECTIVE QUESTIONS (BATTERIES)

1. A lead-acid battery is considered fully charged when the

1. electrolyte gasses freely
2. battery charger ammeter indicates a positive reading
3. terminal voltage reaches a constant value at a given temperature
4. specific gravity of all cells reaches the correct value and no longer increases
   over a period of 1 to 4 hours                                                

answer d

2. A hydrometer indicates specific gravity by comparing the

1. density of a substance in water with the density of the same substance in air
2. differences in weight between water and the liquid measured
3. mass of substance measured with the density of the same substance
4. buoyancy of an object in water with the buoyancy of the same object in the liquid being measured

answer d

3. Regarding battery charging rooms, ventilation should be provided

1. at the lowest point of the room
2. at the highest point of the room
3. horizontally near the batteries
4. only when charging is in process

answer b

4. Which of the following statements concerning the specific gravity of electrolyte of a battery is    true?

1. the electrolyte become less dense when it is cooled
2. the specific gravity reading is lowered when electrolyte is heated
3. the most accurate hydrometer reading is obtained immediately after water is added
4. The temperature does not affect the specific gravity of the electrolyte

answer b

5. Batteries used for diesel engine starting should

1. be located in a locker on the weather deck
2. be located as close as possible to the engine
3. have sufficient capacity to provide at least 50 starts consecutively without recharging
4. only be of the nickel alkaline type

answer b

6. Battery charging rooms should be well ventilated because the charging process produces

1. highly poisonous gas
2. highly combustible oxygen
   
   
3. explosive gases
4. corrosive gases

answer c

7. Routine maintenance of lead acid batteries should include

1. keeping the terminals clean
2. coating the cable connections with petroleum jelly
3. maintaining a trickle charge
4. all the above

answer d   

8. The charge of a lead-acid battery can be restored by

1. passing an alternating current through the cell
2. passing a direct electric current through the cell
3. adding acid to the electrolyte
4. all the above

answer b

9. To test the state of charge of a nickel-cadmium battery we use

1. ammeter
2. voltmeter
3. hydrometer
4. megger

answer b

10. A lead-acid battery may become hotter than normal during a charge if the

1. battery has a shorted cell
2. charging voltage is too low
3. specific gravity is too high
4. battery room door is secured

answer a

11. When charging a nickel-cadmium battery

1. the charging rate should be lessened when gassing commences
2. overcharging should be avoided
3. specific gravity of the electrolyte will be unaffected by the state of charge
4. adding distilled water just prior to charging to ensure proper mixing

answer c

12. When lead-acid batteries are charging, they always give off hydrogen gas that is

1. considered inert
2. highly explosive
3. extremely toxic
4. heavier than air

answer b

13. Violent gassing from a lead-acid battery while it is being charged, indicates that the

1. plate separators are grounded
2. battery compartment ventilation is inadequate
3. electrolyte specific gravity is too low
4. charge rate is too high

answer d


14. The capacity of a storage battery is measured in

1. volts
2. ampere-hours
3. farads
4. amperes

answer b

15. The proper way to mix the electrolyte for a battery is to add

1. acid to alkaline water
2. acid to distilled water
3. alkaline water to acid
4. distilled water to acid

answer b

16.Caution must be exercised during the charging of lead-acid storage batteries as

1. acid will become weaker
2. hydrogen gas is being continuously liberated
3. lead peroxide in the negative plate is poisonous
4. both plates are changing chemically to lead sulphate

answer b

17. During discharge of a lead-acid storage battery, which of the following actions occurs?

1. acid becomes stronger
2. both plates chemically change to ammonium chloride
3. acid becomes weaker
4. hydrogen gas is liberated

answer c


18. Which of the processes listed occurs during the charging of a lead acid battery

1. negative plate change to lead peroxide
2. positive plate change to lead peroxide
3. both plates change to lead peroxide
4. both plates changes to lead sulphate

answer b

19. Nickel-cadmium batteries are superior to lead-acid batteries at high discharge rates because they

1. deliver large amount of power and can be recharged in shorter time
2. need fewer cells connected series and less mounting space
3. have higher output voltages and require no maintenance
4. all the above

answer a   

20. At high discharge rates, nickel-cadmium storage batteries are superior to lead-acid batteries      because they

1. require fewer cells for the same voltage and less mounting space
2. are able to produce higher voltages and do not have to be charged as often
3. can be charged and discharged many times without much damage
4. have no individual cells to replace at the end of useful life 

answer c