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General A&P FAA > Batteries > Flashcards

Batteries Flashcards

1
Q

The definition of a battery

A

A device that converts chemical energy into electrical energy

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2
Q

Which type of battery cells are rechargeable and which aren’t?

A

Primary cell are not rechargeable Secondary cells are rechargable

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3
Q

Why are secondary cell batteries called “storage batteries”?

A

Secondary cells do not produce electrical energy. They store it in chemical form

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4
Q

Each cell in a Lead-acid battery produces how much voltage?

A

2.1V

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5
Q

The 2 main purposes for an aircraft battery

A
  1. To provide backup emergency electrical power 2. To provide power for starting an engine
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6
Q

Identify

A
  1. Casing
  2. Annode
  3. Cathode
  4. Electrolyte
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7
Q

Identify

A
  1. Casing
  2. Positive terminal
  3. Negative terminal
  4. Cel divider
  5. Positive electrode (lead dioxide)
  6. Negative electrode (lead)
  7. Sulfuric acid and water
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8
Q

When a primary cell is fully charged, the potential differnce between the two electrodes is approximately

A

1.5V

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9
Q

In a closed circuit, as the transfer of electorns from the postive electrode to the negative electrode continues through the electrolyte, what eventally happens to the negative electrode in a primary cell battery?

A

It dissovles in the electrolyte

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10
Q

Oxidizing is the process of

A

loosing electrons

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11
Q

Identify (carbon-zinc)

A
  1. Metal cap
  2. Carbon rod
  3. Zinc Case
  4. Manganese Dioxide
  5. Ammonium chloride
  6. Metal bottom
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12
Q

The annodic, cathodic and electrolytic materials for an Alkaline battery

A
  1. zinc annode
  2. Manganese dioxide cathode
  3. Potassium hydroxide electrolyte
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13
Q

How can the composition of the electrolyte and electrodes and the chemical energy inside the electrolyte be restored?

A

Passing a charging current throught the battery in the reverse direction of discharge

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14
Q

The capacity of a battery cell is the measure of

A

How much current the battery can provide for a specific period of time

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15
Q

What must the charging voltage be while recharging a secondary cell battery?

A

Greater than the potential differnce between the electrodes

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16
Q

Capacity of a battery is measured in

A

Ampere hours

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17
Q

The determining factor of the capacity of a battery

A

Surface area of the electrodes (plates)

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18
Q

A cell with a capacity of 80 Ah should produce

A

80 amps for 1 hour

or

40 amps for 2 hours

or

8 amps for 10 hours

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19
Q

The 3 ways that battery cells can be connected in

A
  1. Serries
  2. Parallel
  3. Series-parallel
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20
Q

The total voltage in a battery where the cells are connected in series

A

The sum of the individual cell voltages

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21
Q

Desribe the total voltage and battery capacity of multiple battery cells arranged in series

A

the voltage will be the sum of the individual cells but the capacity will remain the same

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22
Q

Desribe the total voltage and battery capacity of multiple battery cells arranged in parallel

A

The total voltage will that of 1 cell, but the capacity will be the sum of the individual cell capacities

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23
Q

If two 12V, 80Ah batteries are connected in series, how will they act?

A

As a battery with 24 V output, 80 Ah

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24
Q

If two 12V, 80Ah batteries are connected in parallel, how will they act?

A

They will act as one battery with 12V out put, at 160Ah

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25
Q

The 2 type of secondary cell batteries used in aviation

A
  1. Lead acid
  2. Alkaline
26
Q

The nominal voltage of each cell of a lead acid battery is

A

2 volts

27
Q

Is the nominal voltage the same as the actual voltage

A

Most of the time, no buut close enough

28
Q

How are the cells in a lead acid battery arranged?

A

In series

29
Q

The annode of a lead acid battery is made of

A

lead peroxide

30
Q

The cathode material in a lead acid battery is made of

A

spongey lead

31
Q

The electrolyte composition of a lead acid battery is made of

A

sulfurice acid and water

32
Q

Where the liquid level of the sulfuric acid electrolyte in a lead acid battery should be at

A

Just above the top of the plate

33
Q

Why is there a need to replenish distilled water in a lead acid battery?

A

Water evaporated during normal use

34
Q

When the cells of a lead-acid battery are working, what gas must be vented?

A

Hydrogen

35
Q

The state of charge of a lead-acid cell can be deterimied by

A

Measuring the electrolyte souluiton

36
Q

The instrument used to measure the SPG of the suluric acid solution in a lead-acid battery (and the formula)

A

Hydrometer ( SPG= weight/ weight of equal volume of distlled water)

37
Q

A fully charged cell of a lead-acid battery will have a SPG value of

A

1.27

38
Q

How does the acid in a lead-acid battery become weaker

A

When the battery is connected to an external circuit and current is flowing

39
Q

Relationship between SPG of sulfuric acid electrolyte, and it’s acidity level

A

Proportional

40
Q

A new fuly charged lead-acid battery will have ___% acid and ___%water

A

30% acid, 70% water

41
Q

When the sulfuric acid electroltyte SPG falls below____, the battery is considered to be discharged

A

1.15

42
Q

The standard refernce temperature for measuring the SPG of sulfuric acid electroylte with a hydrometer is:

A

80F

43
Q

If a hydrometer test is done at a temperature other than 80F, what must be done?

A

Correction must be added using a correction chart

44
Q

The lead peroxide in the positive electorde of a lead-acid battery turns into_________ during discharge

A

lead sulfate

45
Q

What does the formed lead sulfate most noticably in a lead-acid battery durring use?

A

Increases internal resistance

46
Q

Desribe the reason for not being able to recahrge a lead-acid battery if it’s been fully discharged a number of time

A

As it is discharged, lead sulfate builds up inbetween the cathode and annode plates

47
Q

The two major aspects that the construction of a battery must compromise between

A

Energy vs power

(storing energy for long time use)

(being able to give a large poweroutput for a small period of time)

48
Q

The four factors that affect the capacity of a lead-acid battery

A
  1. Amount of active material
  2. Surface area of the plates
  3. Amount of electrolyte
  4. Temperature
49
Q

The rating used to specify the capacity of a battery

A

5- hour discharge rating

50
Q

Description of the 5- hour discharge rating

A

Represents the number of Amp hours of capacity, when there is sufficient current flow, to reduce the voltage of the battery completly to zero, over the course of 5 hours

51
Q

How to remove corosion off of battery terminals of a lead-acid battery (steps)

A

Gently scrub the box and terminals with a soft bristled brush and a solution of sodium bicarbonate.

Once clean, rinse with clean water and dry

Coat the battery terminals with petrolum jelly

52
Q

Do you ever add acid to a lead-acid battery during servicing?

A

Only if it has spilled

53
Q

Steps for receiving a new dry-charged state battery

A
  1. Pour in electrolyte (shipped with battery)
  2. Give a slow boost charge
  3. Let battery sit for an hour and adjust electroltye level
54
Q

The sequence for mixing electrolyte solution for a lead-acid battery and why does it have to be in that sequence

A

must add the ACID to the WATER.

[If water is added to the acid, water is less dense and will float to the top of the acid which will cause a chemical reaction at the top of the container which boils the water and acid will splash outside of the container]

55
Q

Should automotive and aircraft electorlytes be mixed?

A

No, differnce SPG’s

56
Q

Relate the two to eachother: Battery internal resistance and charging current

A

The charging voltage needs to be higher than the open-circuit voltage of the battery to overcome the battery’s interal resistance

57
Q

What is open-circuit voltage?

A

The voltage of the battery for EMF course when not connected to the circuit

58
Q

The 2 methods of battery charging

A
  1. Constant current charging
  2. Constant voltage charging
59
Q

synomn for open-circuit voltage

A

synonmn for no-load voltage

60
Q

What is the onload or nominal voltage?

A

Voltage of a cell with load being used

61
Q

What is the off load voltage?

A

Voltage with no load applied?

General A&P FAA (26 decks)

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