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(Generals)Basic Electricity II-A1-MC(Basics) > AS113 - Lecture - Lead Acid Batteries > Flashcards

AS113 - Lecture - Lead Acid Batteries Flashcards

1
Q

A device of two or more cells that changes chemical energy into electrical energy.

A

Battery

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2
Q

There are two Categories of battery

PG. 3-53 & 10-90

A

Primary Cell

Secondary Cell

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3
Q

Compact, light weight.

The active elements in this battery become exhausted and cannot be restored.

A

Primary Cell or Dry Cell

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4
Q

There are three Types of Primary Cells

A
  1. Carbon-Zinc cell
  2. Alkaline cells
  3. Mercury Cells
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5
Q

Electrons flow from zinc to carbon rod.

Produces 1.5 vdc regardless of size.

Size of cell will determine current.

Ammonium chloride-electrolyte .

A

Carbon-Zinc cell

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6
Q

Longer life and less expensive.

Zinc rod, potassium hydroxide electrolyte solution.

Potassium hydroxide has a lower resistance than ammonium chloride of carbon-zinc cells.

Built differently.

A

Alkaline cells

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7
Q

Use for hearing aids, cameras, etc..

High capacity.

Mercuric oxide (positive).

Potassium hydroxide (negative)-electrolyte.

A

Mercury Cells

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8
Q

Takes electrical energy and stores it chemically.

When called upon it converts chemical energy into electrical energy.

A

Secondary Cells

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9
Q

Typical battery consists of 6 or 12 cells.

Each cell produces 2.1 volts.

6 cells- 12volt battery.

12 cells- 24 volt battery.

A

Lead acid battery

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10
Q

Battery most commonly used on aircraft

A

Lead acid battery

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11
Q

Grid of lead and antimony filled with lead peroxide.

A

Positive Plates

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12
Q

Similar grid but it is filled with Spongy lead.

One extra negative plate

A

Negative Plates

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13
Q

Plates do not go all the way to the bottom because.

A

This allows for sediment to collect

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14
Q

Separates plates and allows electrolyte (sulfuric acid and water) to keep in contact with the active material on plates.

A

Porous Separator

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15
Q

Battery Case is made of; (smaller aircraft)

A

Hard plastic (previously hard rubber)

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16
Q

Close cell openings

Have lead weights to prevent electrolyte from escaping at unusual flight attitudes.

A

Vented screw-in type Caps

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17
Q

Battery case for Large aircraft is made of?

A

Steel case (larger aircraft)-for shielding and mechanical protection.

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18
Q

Electrons flow from negative to positive plates.

Positive Ions form on negative plates

which attracts negative sulfate ions from the sulfuric acid.

A

Discharge

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19
Q

This reaction causes lead sulfate to form on both the positive and negative plates.

As the sulfate ions are attracted by the plates the electrolyte becomes diluted.

Water then forms.

At this discharged state the battery is more susceptible to freezing.

A

Discharge

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20
Q

Electrons drawn from positive plates and force on negative plates.

Electrons drive lead sulfate back into the electrolyte.

This makes the electrolyte sulfuric acid again.

Hydrogen gas is created and released.

A

Charge

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21
Q

“Condition of Charge”

Open circuit voltage (OCV)

A

2.1 vdc per cell

OCV does not reflect the state of battery charge.

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22
Q

1.275-1.300 fully charged

@ 80 degrees F

1.150 battery discharged

A

Specific Gravity

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23
Q

Below ______________________,
there is not enough chemical
strength in the electrolyte to
convert the active material into
lead sulfate.

A

1.150 specific gravity

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24
Q

uses a calibrated float

more dense the liquid higher the specific gravity

more buoyant the hydrometer more dense the liquid

A

Hydrometer

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25
Q

Electrolyte is ____ dense at ______ temperatures, and more dense at lower temperatures.

A

less

higher

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26
Q

Active material converts into lead sulfate which increases the battery’s internal resistance when a.

A

A load is placed on the battery

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27
Q

The ability to produce a given amount of current for a specified time.

A

Capacity

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28
Q

______ is measured in ampere-hours

A

Capacity

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29
Q

Capacity is affected by four things

A
  1. Amount of active material.
  2. The plate area.
  3. Quantity of electrolyte.
  4. Temperature:
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30
Q

Cold temperature decreases _______.

A

Capacity

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31
Q

50 F fully charged battery may provide power for ____ hours.

0 F same battery supplies power for _____ hour.

A

5hr
1hr

32
Q

Standard rating used to specify the capacity of a battery.

A

Five Hour Discharge:

33
Q

5 amps for 5hours capacity = ____ampere-hours

A

25

34
Q

Capacity will ______ when discharged at a higher rate.

A

decrease

35
Q

This is due to heat, sulfation of plates and the tendency of the electrolyte to become diluted immediately around the plates.

A

Capacity decreasing when discharged at a higher rate.

36
Q

Cell Test:

With load on the battery test cells.

All cells should be within ___ volts of each other.

A

.05

37
Q

Cell Test:

Verify electrolyte level is ___.

Apply a heavy load for ___ sec. by cranking engine w/starter and ign. off.

Turn on taxi lights or landing lights, enough to draw ___ amps.

While load current is ________, measure voltage at each cell.

A

3
10
flowing

38
Q

A good battery will not go below _____ and all cells should be within _____ of each other.

A

1.95v

.05v

39
Q

In a discharge condition.

If any cell is higher than 1.95v with more than .05v difference between any cell, then a cell is _______.

A

defective

40
Q

How to service and charge a battery

A

Keep terminals clean, connections tight with no corrosion.

Clean corrosion with brush and baking soda.

Coat terminals – Use manufacturer’s recommended grease.

Insure correct level of electrolyte.

Add only distilled or de-mineralized water.

41
Q

Do not get the baking soda in battery.

A

It will neutralize the electrolyte.

42
Q

How do you dilute acid

A

Pour acid into the water

Never pour water into acid

43
Q

Pouring water into acid will cause a severe ______ reaction with acid

A

exothermic

44
Q

If acid gets into your eyes, flush with _______.

A

water

45
Q

Never mix automotive and aircraft _______

A

electrolyte

46
Q

NEVER _____ THE TERMINALS OF A BATTERY.

A

SHORT

47
Q

_________ SHOULD BE USED WHEN TRANSPORTING BATTERIES.

A

CARRYING STRAPS

48
Q

PROTECTIVE CLOTHING, SUCH AS;
SHOULD BE WORN WHEN WORKING WITH BATTERIES.

A

RUBBER APRON
RUBBER GLOVES
FACE SHIELD

49
Q

__________, ELECTRIC SPARKS, OR OPEN FLAMES SHOULD BE PERMITTED NEAR CHARGING BATTERIES.

A

NO SMOKING

50
Q

CARE SHOULD BE TAKEN TO PREVENT __________ OF THE ELECTROLYTE

A

SPILLING

51
Q

A mixture of hydrogen and air can be dangerously _______. No smoking, electric sparks, or open flames should be permitted near charging batteries.

A

Explosive

52
Q

Charging source must be ____ than open circuit voltage (OCV)

A

greater

53
Q

Batteries are charged by either ________ or _________

A

Constant Current or Constant Voltage Charging

54
Q

Most effective

Always follow MFG’s recommendations

Multiple batteries - connect in series when charging

A

Constant Current Charging:

55
Q

Aircraft charges batteries by constant voltage.

Shop chargers boost or jump battery- not airworthy.

A

Constant Voltage Charging:

56
Q

(8083) Passing direct current through the battery in a direction opposite to that of the discharge current _____ charge a storage battery. Because the internal resistance (IR) in the battery, the voltage of the external charging source must be ______ than the open circuit voltage.

A

may
greater

57
Q

When Installing the Battery

_______ terminal gets connected first.

_______ terminal last (this “arms” the battery).

A

Positive
Negative

58
Q

When removing the Battery:

_______ terminal must be disconnected first (this “disarms” the battery).

_______ terminal last.

A

Negative
Positive

59
Q

Keep wrenches, screwdrivers, jewelry, etc. from making unwanted contact with the terminals! True/Flase

A

True

60
Q

Parallel-Series Battery Connections:

Connecting batteries in parallel increases ______ (capacity), but not ______.

A

amps
voltage

61
Q

Connecting batteries in series increases _______, but not _______.

A

voltage
capacity

62
Q

Vents-vent fumes from inside the battery box.

A

Battery Box

63
Q

Sump jar-contains _________ ______ moistened with sodium bicarbonate and water.

A

absorbent pads

64
Q

A ______ is a device that transforms chemical energy into electrical energy.

A

CELL

65
Q

The cell has three parts;

A

the electrodes, the electrolyte, and the container.

66
Q

There are two basic cells:

A

primary and secondary

67
Q

________are the current conductors of the cell.

A

ELECTRODES

68
Q

_______is the solution that acts upon the electrodes.

A

THE ELECTROLYTE

69
Q

_________holds the electrolyte and provides a means of mounting the electrodes.

A

THE CONTAINER

70
Q

is a cell in which the chemical action finally destroys one of the electrodes, usually the negative. The primary cell cannot be recharged.

A

THE PRIMARY CELL

71
Q

_______is a cell in which the chemical action alters the electrodes and electrolyte.

A

THE SECONDARY CELL

72
Q

The electrodes and electrolyte can be restored to their original condition by ________ the cell.

A

recharging

73
Q

_______ is the process of converting chemical energy into electrical energy.

A

ELECTROCHEMICAL ACTION

74
Q

________ is the positive electrode of a cell.

A

THE ANODE

75
Q
A

(Generals)Basic Electricity II-A1-MC(Basics) (10 decks)

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