H

Question 1

H1

What is the electrolyte used in a nickel-cadmium battery?

Answer 1

Potassium hydroxide and water.

Question 2

H2

Why is a hydrometer not used to measure the state of a charge of a nickel cadmium battery?

Answer 2

The electrolyte of a nickel cadmium battery does not enter into the chemical changes that occur when the battery is charged or dis charged. It’s specific gravity does not change appreciably.

Question 3

H3

Is the electrolyte level,of a nickel cadmium battery lowest when it is fully charged or fully discharged?

Answer 3

Fully discharged.

Question 4

H4

What is the result of,cell imbalance in nickel cadmium battery?

Answer 4

The low internal resistance allows,current to flow between the unbalanced cells and generate heat

Question 5

H5

What is thermal runaway?

Answer 5

The large current flow allowed by low internal resistance causes the middle cells to produce more heat than they can dissipate. The heat further lowers the internal resistance so more current can flow; this continues until the battery destroys itself.

Question 6

H6

How may thermal runaway be prevented?

Answer 6

By carefully monitoring the temperature of the middle cells and controlling the charging current to prevent an excess of current flowing into the battery.

Question 7

H7

how is it possible to know when a nickel – cadmium battery is fully charged.

Answer 7

Completely discharged the battery and give it a constant-current charge to 140% of its ampere hour.

Question 8

H8

What is used to neutralize spilled electrolyte from a nickel cadmium battery?

Answer 8

A solution of boric acid and water.