3.5

Question 1

In aircraft storage batteries, secondary cells are made form?

Answer 1

Lead acid and nickel cadmium

Connected in series

Question 2

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

Answer 2

In series

Question 3

A lead acid cell consist of what

Answer 3

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

Question 4

What does CCV stand for?

Answer 4

Closed circuit voltage

Question 5

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

Answer 5

Internal Resistance (IR)

Question 6

What makes up nickel cadmium cells?

Answer 6

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

Question 7

What does IR do?

Answer 7

Restricts the movement of current inside any battery

Question 8

What does OCV stand for?

Answer 8

Open circuit voltage

Question 9

What type of cells are rechargeable

Answer 9

Secondary

Question 10

What voltage does nickel cadmium have when discharged

Answer 10

1V

Question 11

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

Answer 11

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

Question 12

What are the disadvantage of nickel cadmium over lead acid

Answer 12

Costly

Larger

Question 13

During discharge, what happens to the negative plate?

Answer 13

It deteriorates and goes into the solution

Question 14

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

Answer 14

Until it becomes over 75% discharge

Question 15

Lead acid cells has what voltage when charged

Answer 15

2V

Question 16

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

Answer 16

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

Question 17

For higher current, what way would you connect a battery

Answer 17

In parallel

Question 18

What happens when the battery discharges

Answer 18

The batteries internal resistance increases

Question 19

What voltage does lead batteries have when discharged

Answer 19

1.83V

Question 20

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

Answer 20

Manganese Dioxide paste

Question 21

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

Answer 21

Zinc= negative electrode

Carbon =positive electrode

Question 22

Zinc carbon batteries provide what type of voltage

Answer 22

Low voltage dc supply.

Question 23

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

Answer 23

At its lowest

Question 24

What are the advantages do nickel cadmium over lead acid

Answer 24

Better power to weight ratio
Closed circuit voltage
Larger capacity

Question 25

If the terminals are not clean,what will happen to the connection

Answer 25

It will not be very good

Question 26

What happens when you recharge up lead acid

Answer 26

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

Question 27

Nickel cadmium has what voltage

Answer 27

1.2V

Question 28

What is an primary cell and an example of one?

Answer 28

Are batteries you can by in shops

E.g Zinc Carbon battery