NSTM Chapter 313, Portable Storage and Dry Batteries Flashcards
1
Q
Rechargeable batteries
A
Secondary cells
2
Q
Non-rechargeable batteries
A
Primary cells
3
Q
Two type of rechargeable batteries
A
Acid
Alkaline
4
Q
Non-rechargeable batteries are referred to as being ___ batteries
A
Dry-cell
5
Q
Most common acid battery
A
Sulfuric acid
6
Q
Most common alkaline battery
A
Potassium hydroxide
7
Q
When working with and around fire and explosive hazards, wear ___
A
Fire retardant engineering coveralls
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
9
Q
Consists of one or more cells assembled in a common container or monobloc case
A
Tray
10
Q
Spacers placed between positive and negative plates to prevent short circuiting between plates of opposite polarity
A
Separators
11
Q
When a separator is ribbed, the flat surface is placed next to the ___ plate
A
Negative
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
13
Q
Retainers add to the ___ of the battery, reducing the ___
A
Internal resistance
Capacity at high-rate discharges
14
Q
Sealed batteries use a ___ to prevent atmospheric oxygen from entering the battery
A
One-way pressure valve
15
Q
The pressure valve in sealed batteries is usually set to ___
A
4 to 6 psi
16
Q
Mixture of sulfuric acid, H2 SO4, and pure distilled water
A
Electrolyte
17
Q
Container in which a single cell is assembled
A
Jar
18
Q
Case in which a number of individual cell jars are molded in one piece
A
Monobloc case
19
Q
The electrical conductors which connect the cells of a tray in series
A
Intercell connectors
20
Q
Used to seal the cell cover to the case
A
Asphaltic bituminous compound
21
Q
Batteries with polystyrene instead of rubber parts are sealed with ___
A
A polystyrene cement
22
Q
Space formed by ribs built into the bottom of the battery
A
Sediment space
23
Q
The top surface of the raised ribs forming the sediment space
A
Element bridge or rest
24
Q
Projections at the bottom of the plates (containing no active material)
A
Plate feet
25
The number of ampere-hours the battery will deliver at that rate before the voltage drops below a specified limiting voltage
Ampere-hour capacity
26
As a vented battery nears completion, some ___ is liberated at the negative plate and ___ at the positive plate
H2
| O2
27
When unpacking batteries, keep them ___
Right side up
28
The electrolyte level should be ___ above the separators
9mm (3/8")
29
If water or electrolyte is added, place the battery on charge until specific gravity readings are constant for a period of ___
5 hours
30
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
One month
31
A period of ___ should be allowed for giving a dry-charged battery the initial charge before placing in service
One day
32
Dry charged batteries in storage can maintain most of their charge for as long as ___
2 years
33
Wet batteries in storage must be charged every ___
4 to 6 months
34
After the electrolyte is placed in the cells, they will have ___ charge
70 to 80%
35
Specific gravity of the electrolyte gradually ___ on discharge
Decreases
36
Routine charge given
Normal charge
37
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
Boost charge
38
Vented battery float charge
2.15 volts per cell
39
Sealed battery float charge
2.25 volts per cell
40
Batteries on standby service shall be recharged no later than ___
Once a month
41
Never allow a battery to stand in a completely discharged condition for more than ___ before recharging
24 hours
42
Batteries should not be charged in ___
An enclosed space
43
Batteries charged in series must be of the same ___ to maintain the proper charging rate
Capacity
44
Electrolyte temperature in a vented battery during charging should never exceed ___
52 degrees C (125 degrees F)
45
The temperature at battery charging stations should be less than ___
36 degrees C (96 degrees F)
46
A test to determine battery capacity for portable storage batteries shall be conducted ___
After 4 years service
| Anytime the ability to perform is questioned
47
To ensure reliable data is obtained in a capacity check, a test discharge must be preceded by ___
A boost charge
48
If the capacity check shows the battery to be 80% or more, then ___
It is to kept in service
49
If the capacity check shows the battery to at less than 80%, then ___
Give it two more cycles of boost charge and capacity discharge, dispose if unsuccessful
50
Who must give permission to dispose of a battery?
Electrical officer
51
Pilot cells in vented batteries shall be checked for height of electrolyte how often?
Once a week or more if necessary
52
The specific gravity of a cell shall not be allowed to remain above the upper limit of ___
1.220
53
Sulfuric acid of a specific gravity greater than ___ shall not be added to a battery
1.350
54
When mixing electrolyte, always pour the ___ into the ___
Acid
| Water
55
PPE for mixing electrolyte
Rubber apron
Rubber boots
Rubber gloves
Full face shield
56
Initial treatment of acid burns
Flush with water for a minimum of 15 minutes
57
Battery maintenance facilities where acid diluting, activation of new batteries, and adjustment of electrolyte is required, ___ shall be installed
Eye-wash and deluge shower within easy reach
58
Areas of routine battery storage shall be provided with ___
Two battery water containers and one soda water container, in 5 gallon polyethylene bottles
59
For acid storerooms and flammable liquid storerooms, a ___ shall be located within the operational facility
Tank-type portable combination shower and eye and face bath, with dedicated storage rack
60
Portable eyewash units shall be pressure or gravity fed with a self-contained supply of freshwater, not less than ___ nor more than ___
3 gallons
| 5 gallons
61
All specific gravity readings must be corrected to ___
27 degrees C (80 degrees F)
62
To obtain accurate temperature readings, the tip of the thermometer must be completely immersed in the electrolyte for at least ___
30 seconds
63
If acid has accumulated on the case, it may be removed by wiping it clean with a cloth moistened in a ___ or ___
Dilute ammonia solution
| Bicarbonate of soda solution
64
When using ammonia or bicarbonate of soda, care must be taken so that ___
It does not enter the cell
65
If a low cell is discharged much below the low-voltage limit in series with other cells, the low cell will ___
Reverse its polarity
66
Hardening of negative plates is caused by ___
Insufficient charging
67
Loss of active material is caused by ___
Undue gassing, overcharging, expansion brought about by high temperatures
68
Local action is caused by ___
Nonhomogeneity of, and impurities in, the material in the plates or the electrolyte, most commonly iron
69
Short circuits are indicated by ___
Abnormal temperature
Low specific gravity
Low voltage
Reduced gassing on charge
70
Short circuits may be caused by ___
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
A cell containing a ___ will gradually discharge itself and become unduly heated on charge
Short circuit
72
Sulfation can usually be taken care of with a ___
Boost charge
73
The presence of a reversed cell in a battery will be indicated by ___
A rapid fall in the battery voltage
74
Batteries in exposed locations which are subject to low temperatures shall be kept ___
Charged
75
Batteries which have seawater contamination shall ___
Be considered unfit for service, replaced, never repaired
76
Do not store vented batteries in a ___ condition
Dry
77
If a battery is to be placed in storage, give it a ___ first
Boost charge
78
Check vented batteries in storage ___ for ___
Monthly
| Specific gravity and proper electrolyte level
79
Sealed batteries in storage shall be checked ___ for ___
Monthly
| Proper open circuit voltage
80
All batteries in storage should be given a boost charge at least every __
4 to 6 months
81
Liquid electrolyte from a lead-acid battery should be ___ before being thrown overboard
Neutralized with baking soda or alkali to a pH of 7.0 to 8.5
82
Batteries should not be thrown overboard due to ___
The heavy metals present
83
Before disposal, batteries should be ___
Emptied of electrolyte
84
Do not store sulfuric acid where ___
Freezing temperatures are possible
85
If seawater enters a battery cell, ___ will result
Chlorine gas
86
The ___ terminal of the battery should be disconnected first and connected last when replacing battery
Grounded
87
Cathode
Positive electrode
88
A cell with no free electrolyte
Dry cell
89
Dry cell voltage is controlled by ___
Choosing the materials to be used for each electrode
90
Dry cell current is determined by ___
The type of electrolyte used
91
Dry cell capacity is determined by ___
The amount of active materials (anode and cathode) used in the cell
92
Measure of the energy per unit volume or mass that a particular cell can deliver to an external circuit
Energy density
93
Dry cell energy density is determined by ___
Determining the electrode materials
94
Dry cell performance ___ at temperatures below 20 degrees C (68 degrees F) while shelf life ___
Declines
| Increases
95
Leclanche cell
Carbon-zinc battery
96
Dry cell performance decreases at lower temperatures due to ___
Reduced chemical activity and higher internal resistance
97
Dry cell performance decreases at higher temperatures due to ___
Parasitic side reactions within the cell
98
Dry cells work best at what temperature?
Room temperature
99
When possible, dry cell batteries should be stored at temperatures ___
Equal to or less than 2 degrees C (35 degrees F)
100
Any battery taken from refrigerated storage should be allowed to warm up to between ___ before use to obtain maximum capacity
18 degrees C (65 degrees F)
| 27 degrees C (80 degrees F)
101
Dry batteries should be removed from equipment if it is to be idle for ___
Two weeks or longer
102
Dry batteries containing ___ cell sizes do not retain capacity as well as others
Smaller
103
The three digit code on dry cells indicate ____
First two digits indicate the month
| Last digit indicates the last digit of the year made
104
Never use a multicell dry battery after its closed circuit voltage has dropped below a value equal to ___
0.9 volts per cell
