Batteries

Question 1

What two things do batteries do?

Answer 1

Start power to engine or APU and power if other sources fail.

Question 2

What does a primary cell mean?

Answer 2

One usage.

Question 3

What are the three batteries used on an aircraft?

Answer 3

Lead / nickel-cadium / lithium

Question 4

Battery discharge is considered to be an x condition.

Answer 4

ON LOAD

Question 5

To recharge a battery, the applied voltage must be blank% blanker than the OFF - LOAD normal voltage.

Answer 5

15 % higher.

Question 6

Under normal circumstances it should take around x minutes to fully charge a battery following an engine start.

Answer 6

20.

Question 7

What is the units for battery capacity?

Answer 7

Amp hours.

Question 8

How to contain battery thermal runaway?

Answer 8

Vented metal box that completely covers the battery.

Question 9

What is the worst case scenario if thermal runaway occurs?

Answer 9

Fire.

Question 10

The flight crew has to be notified if a large amount of lithium batteries are being carried in the hold as…
They are prone to blank if overheated.

Answer 10

Thermal runaway.

Question 11

Most aircraft batteries used during flight employ a Constant Voltage Charging system to sustain them in a fully charged state. This system ensures that the generator’s output voltage remains steady at x volts for a 12-volt battery and x volts for a 24-volt battery.

Answer 11

14 28

Question 12

The voltage of a fully charged lead-acid battery cell under no electrical load is… x volts.

Answer 12

2.2volts

Question 13

An advantage of nickel-cadmium compared with lead-acid batteries is that they…maintain a constant output voltage during x.

Answer 13

Discharge

Question 14

In a multi-cell lithium battery, one cell sets on fire. The fire will/wont spread to other cells.

Answer 14

Will

Question 15

Batteries connected in series increase voltage/current/resistance

Answer 15

Voltage

Question 16

Batteries connected in parallel increase voltage/current/resistance

Answer 16

Current.

Question 17

The test to assess the state of charge of a lead-acid battery is to…compare the x and x battery voltages

Answer 17

Onload / offload

Question 18

True or false : The total battery capacity is dependent on the voltage rating of its battery cells

Answer 18

False

Question 19

If one of the 12 cells of a Lead-acid battery has a broken connection rendering it inoperable, the battery…

Answer 19

Cannot be used.

Question 20

A lithium polymer battery is most likely to be a hazard to the aircraft when the battery has an extreme blank blank

Answer 20

Internal pressure

Question 21

What is a major risk to a battery in case of damage or abuse? Bank current and thermal runaway.

Answer 21

High

Question 22

When the battery ammeter shows “+24” the battery… is being charged/discharged with 24 A/V

Answer 22

Charged / A

Question 23

A Lithium Ion battery can be considered most unsafe… when the battery has an internal blank

Answer 23

Internal short circuit.

Question 24

The electrolyte in a Nickel Cadmium battery is… blank hydroxide.

Answer 24

Potassium

Question 25

A significant increase in battery temperature during charge is an indication of…

Answer 25

Thermal runaway

Question 26

When a battery is almost fully discharged there is a tendency for the: blank to decrease even under light loads.

Answer 26

Voltage.

Question 27

An advantage of nickel-cadmium compared with lead-acid batteries is that they… provide a constant output blank during discharge.

Answer 27

Voltage,
.