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Test stuff > NSTM Chapter 313, Portable Storage and Dry Batteries > Flashcards

NSTM Chapter 313, Portable Storage and Dry Batteries Flashcards

1
Q

Rechargeable batteries

A

Secondary cells

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2
Q

Non-rechargeable batteries

A

Primary cells

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3
Q

Two type of rechargeable batteries

A

Acid

Alkaline

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4
Q

Non-rechargeable batteries are referred to as being ___ batteries

A

Dry-cell

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5
Q

Most common acid battery

A

Sulfuric acid

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6
Q

Most common alkaline battery

A

Potassium hydroxide

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7
Q

When working with and around fire and explosive hazards, wear ___

A

Fire retardant engineering coveralls

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8
Q

Unit consisting of positive and negative plates, separators, a cell cover and electrolyte, properly assembled in a single jar or one compartment of a monobloc case

A

Cell

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9
Q

Consists of one or more cells assembled in a common container or monobloc case

A

Tray

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10
Q

Spacers placed between positive and negative plates to prevent short circuiting between plates of opposite polarity

A

Separators

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11
Q

When a separator is ribbed, the flat surface is placed next to the ___ plate

A

Negative

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12
Q

Sheets of suitable material used in conjunction with the separators to aid in holding the active material of the positive plates in place and to protect the separator from the action of the positive material

A

Retainers

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13
Q

Retainers add to the ___ of the battery, reducing the ___

A

Internal resistance

Capacity at high-rate discharges

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14
Q

Sealed batteries use a ___ to prevent atmospheric oxygen from entering the battery

A

One-way pressure valve

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15
Q

The pressure valve in sealed batteries is usually set to ___

A

4 to 6 psi

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16
Q

Mixture of sulfuric acid, H2 SO4, and pure distilled water

A

Electrolyte

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17
Q

Container in which a single cell is assembled

A

Jar

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18
Q

Case in which a number of individual cell jars are molded in one piece

A

Monobloc case

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19
Q

The electrical conductors which connect the cells of a tray in series

A

Intercell connectors

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20
Q

Used to seal the cell cover to the case

A

Asphaltic bituminous compound

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21
Q

Batteries with polystyrene instead of rubber parts are sealed with ___

A

A polystyrene cement

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22
Q

Space formed by ribs built into the bottom of the battery

A

Sediment space

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23
Q

The top surface of the raised ribs forming the sediment space

A

Element bridge or rest

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24
Q

Projections at the bottom of the plates (containing no active material)

A

Plate feet

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25
Q

The number of ampere-hours the battery will deliver at that rate before the voltage drops below a specified limiting voltage

A

Ampere-hour capacity

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26
Q

As a vented battery nears completion, some ___ is liberated at the negative plate and ___ at the positive plate

A

H2

O2

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27
Q

When unpacking batteries, keep them ___

A

Right side up

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28
Q

The electrolyte level should be ___ above the separators

A

9mm (3/8”)

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29
Q

If water or electrolyte is added, place the battery on charge until specific gravity readings are constant for a period of ___

A

5 hours

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30
Q

If the battery is not to be placed in service immediately, give it a boost charge within ___ from the initial charge stamped on the name plate

A

One month

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31
Q

A period of ___ should be allowed for giving a dry-charged battery the initial charge before placing in service

A

One day

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32
Q

Dry charged batteries in storage can maintain most of their charge for as long as ___

A

2 years

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33
Q

Wet batteries in storage must be charged every ___

A

4 to 6 months

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34
Q

After the electrolyte is placed in the cells, they will have ___ charge

A

70 to 80%

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35
Q

Specific gravity of the electrolyte gradually ___ on discharge

A

Decreases

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36
Q

Routine charge given

A

Normal charge

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37
Q

Extended charge given periodically to ensure that all the sulfate is driven from the plates and all cells are restored to a uniform max specific gravity

A

Boost charge

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38
Q

Vented battery float charge

A

2.15 volts per cell

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39
Q

Sealed battery float charge

A

2.25 volts per cell

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40
Q

Batteries on standby service shall be recharged no later than ___

A

Once a month

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41
Q

Never allow a battery to stand in a completely discharged condition for more than ___ before recharging

A

24 hours

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42
Q

Batteries should not be charged in ___

A

An enclosed space

43
Q

Batteries charged in series must be of the same ___ to maintain the proper charging rate

A

Capacity

44
Q

Electrolyte temperature in a vented battery during charging should never exceed ___

A

52 degrees C (125 degrees F)

45
Q

The temperature at battery charging stations should be less than ___

A

36 degrees C (96 degrees F)

46
Q

A test to determine battery capacity for portable storage batteries shall be conducted ___

A

After 4 years service

Anytime the ability to perform is questioned

47
Q

To ensure reliable data is obtained in a capacity check, a test discharge must be preceded by ___

A

A boost charge

48
Q

If the capacity check shows the battery to be 80% or more, then ___

A

It is to kept in service

49
Q

If the capacity check shows the battery to at less than 80%, then ___

A

Give it two more cycles of boost charge and capacity discharge, dispose if unsuccessful

50
Q

Who must give permission to dispose of a battery?

A

Electrical officer

51
Q

Pilot cells in vented batteries shall be checked for height of electrolyte how often?

A

Once a week or more if necessary

52
Q

The specific gravity of a cell shall not be allowed to remain above the upper limit of ___

A

1.220

53
Q

Sulfuric acid of a specific gravity greater than ___ shall not be added to a battery

A

1.350

54
Q

When mixing electrolyte, always pour the ___ into the ___

A

Acid

Water

55
Q

PPE for mixing electrolyte

A

Rubber apron
Rubber boots
Rubber gloves
Full face shield

56
Q

Initial treatment of acid burns

A

Flush with water for a minimum of 15 minutes

57
Q

Battery maintenance facilities where acid diluting, activation of new batteries, and adjustment of electrolyte is required, ___ shall be installed

A

Eye-wash and deluge shower within easy reach

58
Q

Areas of routine battery storage shall be provided with ___

A

Two battery water containers and one soda water container, in 5 gallon polyethylene bottles

59
Q

For acid storerooms and flammable liquid storerooms, a ___ shall be located within the operational facility

A

Tank-type portable combination shower and eye and face bath, with dedicated storage rack

60
Q

Portable eyewash units shall be pressure or gravity fed with a self-contained supply of freshwater, not less than ___ nor more than ___

A

3 gallons

5 gallons

61
Q

All specific gravity readings must be corrected to ___

A

27 degrees C (80 degrees F)

62
Q

To obtain accurate temperature readings, the tip of the thermometer must be completely immersed in the electrolyte for at least ___

A

30 seconds

63
Q

If acid has accumulated on the case, it may be removed by wiping it clean with a cloth moistened in a ___ or ___

A

Dilute ammonia solution

Bicarbonate of soda solution

64
Q

When using ammonia or bicarbonate of soda, care must be taken so that ___

A

It does not enter the cell

65
Q

If a low cell is discharged much below the low-voltage limit in series with other cells, the low cell will ___

A

Reverse its polarity

66
Q

Hardening of negative plates is caused by ___

A

Insufficient charging

67
Q

Loss of active material is caused by ___

A

Undue gassing, overcharging, expansion brought about by high temperatures

68
Q

Local action is caused by ___

A

Nonhomogeneity of, and impurities in, the material in the plates or the electrolyte, most commonly iron

69
Q

Short circuits are indicated by ___

A

Abnormal temperature
Low specific gravity
Low voltage
Reduced gassing on charge

70
Q

Short circuits may be caused by ___

A

Faulty separators
Lead particles forming a circuit between positive and negative plates
Buckling of plates resulting in negative to positive contact
Excessive accumulation of sediment
Mossing
Crack in the partition between cells in a monobloc case

71
Q

A cell containing a ___ will gradually discharge itself and become unduly heated on charge

A

Short circuit

72
Q

Sulfation can usually be taken care of with a ___

A

Boost charge

73
Q

The presence of a reversed cell in a battery will be indicated by ___

A

A rapid fall in the battery voltage

74
Q

Batteries in exposed locations which are subject to low temperatures shall be kept ___

A

Charged

75
Q

Batteries which have seawater contamination shall ___

A

Be considered unfit for service, replaced, never repaired

76
Q

Do not store vented batteries in a ___ condition

A

Dry

77
Q

If a battery is to be placed in storage, give it a ___ first

A

Boost charge

78
Q

Check vented batteries in storage ___ for ___

A

Monthly

Specific gravity and proper electrolyte level

79
Q

Sealed batteries in storage shall be checked ___ for ___

A

Monthly

Proper open circuit voltage

80
Q

All batteries in storage should be given a boost charge at least every __

A

4 to 6 months

81
Q

Liquid electrolyte from a lead-acid battery should be ___ before being thrown overboard

A

Neutralized with baking soda or alkali to a pH of 7.0 to 8.5

82
Q

Batteries should not be thrown overboard due to ___

A

The heavy metals present

83
Q

Before disposal, batteries should be ___

A

Emptied of electrolyte

84
Q

Do not store sulfuric acid where ___

A

Freezing temperatures are possible

85
Q

If seawater enters a battery cell, ___ will result

A

Chlorine gas

86
Q

The ___ terminal of the battery should be disconnected first and connected last when replacing battery

A

Grounded

87
Q

Cathode

A

Positive electrode

88
Q

A cell with no free electrolyte

A

Dry cell

89
Q

Dry cell voltage is controlled by ___

A

Choosing the materials to be used for each electrode

90
Q

Dry cell current is determined by ___

A

The type of electrolyte used

91
Q

Dry cell capacity is determined by ___

A

The amount of active materials (anode and cathode) used in the cell

92
Q

Measure of the energy per unit volume or mass that a particular cell can deliver to an external circuit

A

Energy density

93
Q

Dry cell energy density is determined by ___

A

Determining the electrode materials

94
Q

Dry cell performance ___ at temperatures below 20 degrees C (68 degrees F) while shelf life ___

A

Declines

Increases

95
Q

Leclanche cell

A

Carbon-zinc battery

96
Q

Dry cell performance decreases at lower temperatures due to ___

A

Reduced chemical activity and higher internal resistance

97
Q

Dry cell performance decreases at higher temperatures due to ___

A

Parasitic side reactions within the cell

98
Q

Dry cells work best at what temperature?

A

Room temperature

99
Q

When possible, dry cell batteries should be stored at temperatures ___

A

Equal to or less than 2 degrees C (35 degrees F)

100
Q

Any battery taken from refrigerated storage should be allowed to warm up to between ___ before use to obtain maximum capacity

A

18 degrees C (65 degrees F)

27 degrees C (80 degrees F)

101
Q

Dry batteries should be removed from equipment if it is to be idle for ___

A

Two weeks or longer

102
Q

Dry batteries containing ___ cell sizes do not retain capacity as well as others

A

Smaller

103
Q

The three digit code on dry cells indicate ____

A

First two digits indicate the month

Last digit indicates the last digit of the year made

104
Q

Never use a multicell dry battery after its closed circuit voltage has dropped below a value equal to ___

A

0.9 volts per cell

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