3.5 Flashcards

1
Q

In aircraft storage batteries, secondary cells are made form?

A

Lead acid and nickel cadmium

Connected in series

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2
Q

If you want higher voltage what way would you connect the batteries

A

In series

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3
Q

A lead acid cell consist of what

A
Positive Plates (lead peroxide)
Negative Plates ( pure spongy lead)
Liquid electrolyte (sulphuric acid(30%) and water(70%))
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4
Q

What does CCV stand for?

A

Closed circuit voltage

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5
Q

The resistance inside a battery connected to a load is called?

A

Internal Resistance (IR)

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6
Q

What makes up nickel cadmium cells?

A
Positive plate(nickel oxyhydroxides) 
Negative plate (metallic cadmium) 
The electrolyte (potassium hydroxide)
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7
Q

What does IR do?

A

Restricts the movement of current inside any battery

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8
Q

What does OCV stand for?

A

Open circuit voltage

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9
Q

What type of cells are rechargeable

A

Secondary

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10
Q

What voltage does nickel cadmium have when discharged

A

1V

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11
Q

During discharge of secondary cells, what happens to the sulphuric acid

A

Breaks up into hydrogen ion (positive) and sulphate ion (negative)

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12
Q

What are the disadvantage of nickel cadmium over lead acid

A

Costly

Larger

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13
Q

During discharge, what happens to the negative plate?

A

It deteriorates and goes into the solution

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14
Q

How long will it take until the IR of a battery will not affect the aircraft electrical system

A

Until it becomes over 75% discharge

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15
Q

Lead acid cells has what voltage when charged

A

2V

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16
Q

When is it said that a battery of lead acid is discharged?

A

When both plates are coated with lead sulphate and no further chemical action can take place

17
Q

For higher current, what way would you connect a battery

A

In parallel

18
Q

What happens when the battery discharges

A

The batteries internal resistance increases

19
Q

What voltage does lead batteries have when discharged

20
Q

What is used to prevent the build up of hydrogen at the positive electrode of the cell?

A

Manganese Dioxide paste

21
Q

In a zinc carbon battery what is positive and what is negative

A

Zinc= negative electrode

Carbon =positive electrode

22
Q

Zinc carbon batteries provide what type of voltage

A

Low voltage dc supply.

23
Q

What is the electrolyte level when the nickel cadmium cells is discharged?

A

At its lowest

24
Q

What are the advantages do nickel cadmium over lead acid

A

Better power to weight ratio
Closed circuit voltage
Larger capacity

25
If the terminals are not clean,what will happen to the connection
It will not be very good
26
What happens when you recharge up lead acid
The sulphate ions are driven back into the solution and combine with hydrogen to create sulphuric acid and the plates return to its original composition
27
Nickel cadmium has what voltage
1.2V
28
What is an primary cell and an example of one?
Are batteries you can by in shops E.g Zinc Carbon battery