Types and purpose of various aircraft electrical system components

Question 1

What characteristics should wires used in aviation industrial have?

Answer 1

Sufficient mechanical strength for service conditions, Do not exceed allowable voltage drop levels and Meet current carrying requirements

Question 2

What determines the size of the wires used in aircraft electrical circuits?

Answer 2

The amount of current the wires are expected to carry under normal operating conditions

Question 3

What happens if excessive current flow caused by a direct short is left unchecked in an aircraft electrical circuit?

Answer 3

) The wire will open the circuit by melting a portion of it

Question 4

What is aircraft wire made up of?

Answer 4

An insulation material and a slender rod or filament of draw metal

Question 5

Do some wires have a sheath between the insulation material and the draw metal?

Answer 5

Yes, but only some wires have a sheath

Question 6

What is the primary purpose of a fuse in an aircraft electrical circuit?

Answer 6

To protect the circuit from overcurrent conditions

Question 7

How does a fuse operate to protect an electrical circuit?

Answer 7

By melting and opening the circuit when current exceeds the rated capacity

Question 8

Where is a fuse installed in an electrical circuit?

Answer 8

In a way that all current in the circuit passes through it

Question 9

Why is it important for the capacity of a fuse to match the needs of the circuit it is used in?

Answer 9

to protect the circuit adequately without premature fuse failure

Question 10

What materials are commonly used in the construction of a fuse?

Answer 10

An alloy of tin and bismuth

Question 11

What is the primary function of a circuit breaker in an aircraft electrical system?

Answer 11

To interrupt the current flow when it exceeds a predetermined value

Question 12

How does a circuit breaker differ from a fuse in terms of functionality?

Answer 12

A circuit breaker can be reset, while a fuse must be replaced after it operates

Question 13

What is a relay in the context of aircraft electrical systems?

Answer 13

An electromechanical switch that uses a small amount of current to control a larger amount

Question 14

What are the main components of a relay?

Answer 14

A coil, armature, and a set of contacts

Question 14

How does a relay operate when a voltage is applied to it?

Answer 14

It energizes an electromagnet to pull an arm down, opening or closing a circuit

Question 15

What are the two contact types in a relay?

Answer 15

Normally open (NO) and normally closed (NC

Question 16

What is the primary function of a transformer?

Answer 16

To change electrical energy from one voltage level to another

Question 16

What happens when the voltage is removed from a relay?

Answer 16

A spring returns the arm to the original position

Question 17

How does a transformer operate?

Answer 17

By mutual induction between two windings to transfer energy

Question 18

What is the purpose of the core in a transformer?

Answer 18

To concentrate and contain the magnetic flux

Question 19

What are the two main classes of transformers?

Answer 19

Voltage and current transformers

Question 20

In a transformer, how are voltage and current related?

Answer 20

If voltage is stepped up, current is stepped down by the same ratio

Question 20

What are the two types of windings in a transformer called?

Answer 20

Primary and secondary windings

Question 21

What determines whether a transformer is a step-up or step-down type?

Answer 21

The turns ratio of the windings

Question 22

How can you determine the output voltage of a transformer?

Answer 22

the output voltage (E2) can be found by multiplying the input voltage (E1) by the ratio of the number of turns in the secondary winding (N2) to the number of turns in the primary winding (N1).

Question 23

What is the general use of a resistor in a circuit?

Answer 23

To limit the amount of current flow

Question 24

What factors influence the construction and sizing of a resistor?

Answer 24

Resistance value, precision of the resistance value, and ability to dissipate heat

Question 25

What does the tolerance of a resistor indicate?

Answer 25

The percentage variation between the marked value and the actual value

Question 26

How is the resistance value of a resistor determined using color bands?

Answer 26

By the sequence of colors representing numbers and tolerance values

Question 27

How do you read the value of a resistor with color bands?

Answer 27

The first band indicates the first digit, the second band the second digit, and the third band the multiplier and the fourth is the tolerance

Question 27

What is the primary function of a PCB?

Answer 27

To create connections between electronic components

Question 28

If a resistor has color bands brown, blue, orange, and silver, what is its resistance value and tolerance?

Answer 28

16,000 ohms ± 10%

Question 29

What dose it mean if there is no fourth band

Answer 29

the tolerance is understood to
be 20 percent.

Question 30

Q: What materials are typically used in the construction of a PCB?

Answer 30

Epoxy fiberglass and copper

Question 31

Besides epoxy fiberglass, what other materials can be used as the base for a PCB?

Answer 31

Ceramic and Teflon

Question 32

How does an incandescent lamp produce light?

Answer 32

By passing an electric current through a filament that glows when heated

Question 33

What material is commonly used for the filament in an incandescent lamp?

Answer 33

Tungsten

Question 34

How is the filament in an incandescent lamp protected from oxidation?

Answer 34

By an inert gas inside the bulb

Question 35

What is the halogen cycle in a halogen lamp?

Answer 35

A process where the halogen gas reacts with evaporated tungsten to redeposit it onto the filament