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B1-3 Electrical Fundamentals > 3.5 DC Sources of Electricity > Flashcards

3.5 DC Sources of Electricity Flashcards

1
Q

In a zinc carbon dry cell what is used as the electrolyte?

A

Water and Sulfuric Acid

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2
Q

In a zinc carbon dry cell what is used as the negative terminal?

A

Zinc (Zn)

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3
Q

In cells what is the purpose of the electrolyte?

A

Provides a path for electron flow, it also acts on the electrodes to cause a reaction

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4
Q

In cells what types of fluids can be used as electrolytes?

A

Salt, Acid or Alkaline solution

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5
Q

What are the 2 categories of cells and what is the difference between them?

A

Primary and Secondary, Once the primary is discharged it can not longer be used, Secondary cells are rechargeable.

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6
Q

What category of cell is a zinc carbon cell?

A

Primary Cell

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7
Q

What category of cell is a lead acid cell?

A

Secondary Cell

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8
Q

What category of cell is nickel cadmium cell?

A

Secondary Cell

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9
Q

What is done to the electrolyte to make a dry cell?

A

It is not in a liquid state but turned into a moist paste

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10
Q

What is the relationship between cell plate area and internal resistance?

A

The larger the plates and closer the plates are the more lower the internal resistance is and greater current transfer.

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11
Q

What is the relationship between cell plate distance and internal resistance?

A

The closer they are the lower the resistance is, the further they are the more resistance there is.

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12
Q

If a lead acid cell has 8 positive plates how many negative plates are required?

A

There is always one more negative than positive = 9 Negative plates

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13
Q

What is the function of a separator in a lead acid cell?

A

Hold the plates apart while allowing free movement of the electrolyte.

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14
Q

What is used to measure the specific gravity of a cell electrolyte?

A

Hydrometer or a refractometer

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15
Q

When is the electrolyte of a lead acid cell topped up?

A

Falls below the plates upper level.

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16
Q

What is the SG of a fully charged lead acid cell?

A

1.270 or “twelve seventy”

17
Q

What is the SG of a full discharged lead acid cell?

A

1.835

18
Q

What is the positive plate of a lead acid cell made of when fully charged?

A

Lead peroxide

19
Q

What is the surface of a positive plate in a lead acid cell made of when discharged?

A

Lead Sulfate

20
Q

What is the negative plate of a lead acid cell made of when charged?

A

Spongy Lead (pb)

21
Q

What is the surface of the negative plate of a lead acid cell made of when discharged?

A

Sulfate ions combine with the lead in the plates and form lead sulfate on the negative plate.

22
Q

What is the voltage of a fully charged lead acid cell?

A

2V per lead acid cell?

23
Q

What is the nominal open circuit cell voltage of a Nicad?

A

1.3V

24
Q

What is the SG of a fully charged Nickel cadmium cell?

A

1.300

25
Q

What is the positive plate of a Nickel cadmium cell made of when charged?

A

Nickel Oxides

26
Q

What is the surface of the positive plate of a Nickel Cad Cell when Discharged?

A

Nickel Hydroxide

27
Q

What is the negative plate of a Nickel Cad Cell made of when charged?

A

Metallic Cadmium

28
Q

What is the surface of a negative plate of a Nickel Cad Cell made of when discharged?

A

Cadmium Hydroxide

29
Q

When should the electrolyte of a Nickel Cadmium cell be topped up?

A

When the electrolyte falls below the plates

30
Q

What is the memory effect in a Nickel Cadmium Cell

A

Where the battery is not fully discharged before recharging limiting the amount of recharge and slow shortening the life of the battery.

31
Q

What is required to generate electricity from a thermocouple?

A

Heat and 2 Dissimilar metals.

32
Q

What is the maximum temperature for a Alumel Chromel Thermo Couple? What type is it?

A

1200 C (K Type)

33
Q

What is the maximum temperature for a Iron-Constantan Couple? What type is it?

A

850 C (J Type)

34
Q

What is the maximum temperature for a Copper Constantan Couple? What type is it?

A

400 C ( T Type )

35
Q

Which parameter increases with an increase in temperature of a thermocouple?

A

Potential Difference (Voltage)

36
Q

What are the 3 types of thermocouples used in aircraft?

A

T,J,K

37
Q

What type of material are photovoltaic cell panels made of?

A

Semiconducting Materials

B1-3 Electrical Fundamentals (16 decks)

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