What causes sulphation in a lead-acid cell?

Not fully charging the cell periodically

Which method is used to clean acid and corrosion on the cell top?

Using a cloth moistened with baking soda

Using a cloth moistened with sulfuric acid

Using a cloth moistened with potassium hydroxide

Why should acid not be added to the electrolyte during maintenance?

Acid does not vaporize and only water is lost

Acid will reduce the specific gravity of the cell

What is the purpose of temperature sensors in Ni-Cd batteries?

To detect thermal runaway conditions

To monitor the battery's charge level

To measure the electrolyte concentration

Why is it important to maintain the venting system in Ni-Cd cells?

To prevent the accumulation of explosive gases

To ensure proper air circulation

What happens if a Ni-Cd battery is subjected to thermal runaway?

The battery may generate enough heat to be destroyed

What material is commonly used for the positive electrode (cathode) in a lithium-ion cell?

Lithium Cobalt Oxide (LiCoO₂)

Which lithium salt is commonly used in the electrolyte of a lithium-ion cell?

Lithium Hexafluorophosphate (LiPF₆)

Lithium Iron Phosphate (LiFePO₄)

Lithium Manganese Oxide (LiMn₂O₄)

What type of features are required within the aircraft for the safe operation of lithium-ion main cells?

Protection circuits and hardware

What is the primary purpose of connecting cells in series?

To increase the current capacity

To decrease the potential difference

What is a common characteristic of cells connected in series?

The same current flows through each cell

Each cell carries a different current

Each cell has a different potential difference

How are cells connected in parallel?

By connecting the positive terminals together and the negative terminals together

By connecting the positive to the negative of the next cell

By stacking the cells on top of each other

What is the capacity of a battery most directly related to?

The amount of material available for chemical action

What is a constant current charger designed to do?

Supply a consistent current to the battery throughout the charge cycle

Vary the current to match the battery voltage

Supply a consistent voltage throughout the charge cycle

What should be done to avoid a short circuit when installing a battery in an aircraft?

Avoid directly connecting the battery terminals

Connect the positive terminal first

Secure the battery terminals with a cover

What is the internal resistance of a cell and how does it affect the battery voltage?

It causes an internal voltage drop that reduces the total voltage supplied by the cell.

It increases the battery voltage.

It remains constant and doesn't affect the voltage.

What is the primary function of a thermocouple in aviation?

To detect fire and high temperatures

To measure pressure in hydraulic systems

To generate electricity for the aircraft's power supply

Which materials are typically used to manufacture photocells?

Cadmium Sulfide (CdS) and Cadmium Selenide (CdSe)

Gallium Arsenide and Indium Phosphide

How does the resistance of a photocell behave in dark conditions?

It remains unchanged from its light-exposed state

3.5 Part 2 DC Sources

Authored by Rajendra Singh Chundawat

Engineering

Vocational training

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the typical specific gravity range of the electrolyte in a Ni-Cd cell?

1.15 - 1.20

1.24 - 1.30

1.30 - 1.40

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What material is used to form the cathode in a Ni-Cd cell?

Nickel Hydroxide (Ni(OH)₂)

Cadmium (Cd)

Lead Dioxide (PbO₂)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the main advantage of Ni-Cd cells over lead-acid cells?

Lower Cost

Higher Charge/Discharge Rates

Smaller Physical Size

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which process is used to form the porous baseplates in a Ni-Cd cell?

Electroplating

Sintering

Anodizing

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What role does the separator play in a Ni-Cd cell?

Facilitates ion flow

Enhances electron flow

Prevents short circuits

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary electrolyte used in Ni-Cd cells?

Sulfuric Acid (H₂SO₄)

Potassium Hydroxide (KOH)

Sodium Hydroxide (NaOH)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the disadvantage of Ni-Cd cells compared to lead-acid cells?

Shorter Operational Life

Lower Voltage Output per Cell

Higher Risk of Overcharging

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3.5 Part 2 DC Sources

What is the typical specific gravity range of the electrolyte in a Ni-Cd cell?

What material is used to form the cathode in a Ni-Cd cell?

What is the main advantage of Ni-Cd cells over lead-acid cells?

Which process is used to form the porous baseplates in a Ni-Cd cell?

What role does the separator play in a Ni-Cd cell?

What is the primary electrolyte used in Ni-Cd cells?

What is the disadvantage of Ni-Cd cells compared to lead-acid cells?

What is the color of the positive plate in a fully charged lead-acid cell?

What causes sulphation in a lead-acid cell?

What is the recommended level of electrolyte above the top of the plates in a lead-acid cell?

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