Electrical 03

Question 1

Batteries on aircraft, especially modern ones are monitored for which of the following: Select 3 answers

1.Voltage

2.Current

3.Frequency

4.Capacity

5.Temperature

Answer 1

1. Voltage
2. Current
3. Temperature

Question 2

Which battery property may pose the greatest danger to the safety of a flight?

a.There is no reliable way of telling the state of charge of the battery prior to flight

b.A battery entering a state of thermal runaway

c.A battery can only provide power for a limited time

d.The highly corrosive liquid spilling out during turbulence

Answer 2

b. A battery entering a state of thermal runaway

Question 3

Select the four types of Battery used in aircraft.

1.Cadmium-Polymide

2.Lead Acid

3.Lithium Peroxide

4.Lithium-Ion

5.Nickel-Cadmium

6.Lithium Polymer

Answer 3

2. Lead Acid
3. Lithium-Ion
4. Nickel-Cadmium
5. Lithium Polymer

Question 4

The voltage of a fully charged lead-acid battery cell is ___ Volts

Answer 4

2.2

Question 5

Two 12V 40amp/hour batteries connected in parallel will produce
[…..] V […..]aH

Answer 5

[12] [80]

Question 6

In recent times Lithium Batteries on CAT aircraft have, due to faults in the batteries, caught fire. What preventative measure has been designed to contain the burning aircraft battery.

1.A stainless steel containment with a vent to atmosphere.

2.A fireproof bag which the battery can be placed in.

3.A Halon Fire System in the battery compartment.

4.There is now no risk from Lithium batteries as they have been internally redesigned to have a higher internal resistance.

Answer 6

1. A stainless steel containment with a vent to atmosphere.

Question 7

What are the Primary Sources of AC power available to the aircraft in normal operation? Select 3

a.APU Generator

b.External Power

c.Engine Generator

d.Battery

e.RAT

Answer 7

a. APU Generator

b. External Power

c. Engine Generator

Question 8

A hot busbar is one that:

a.is permanently connected to the battery

b.is connected to the battery in an emergency

c.supplies galley power

d.carries all the non-essential loads

Answer 8

a. is permanently connected to the battery

Question 9

A Simple DC system on a modern single engine aircraft consists of:

1.An Alternator which does not require voltage regulation, an AC battery and 2 BUS bars.

2.A DC Generator, alternator and BUS bars

3.A DC generator, battery, alternator switch and 2 or more BUS bars.

4.An Alternator with Voltage Regulator, a battery, and one or more BUS bars.

Answer 9

4. An Alternator with Voltage Regulator, a battery, and one or more BUS bars.

Question 10

The flight safety risk of a Lithium battery fire on the aircraft, is increased;

1.If the battery is pre-charged

2.If the aircraft is full of passengers

3.If the demand on the AC Generation system is increased.

4.If you are flying through a snow storm.

Answer 10

2. If the aircraft is full of passengers