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Avionics > Everything > Flashcards

Everything Flashcards

1
Q

How many milli amps is fatal

A

100 milli amps or more

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2
Q

During a shock the degree of interference depends on? [3]

A

Where the current flows in the body
Amount of current flowing
Duration of electric shock

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3
Q

Effects of electric shock

A

● burns
●unconsciousness
●respiration stops
●reduction of blood circulation

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4
Q

Immediate actions to take when discovering a shock victim [3]

A

●assess for dangers
●Isolate victim from power source
●render first aid and call for medical

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5
Q

When removing the current source for an electric shock victim what items do we use?

A

A DRY inulating material
Eg.
Wood
Plastics
Rubber

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6
Q

Outline voltage

A

The driving force in electric circuits

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7
Q

Explain EMF (electromotive force)

A

The force that tends to produce a current in an electric circuit
Symbol, V or E, units Volts

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8
Q

Outline PD (potential difference)

A

The voltage difference between two points in an electric circuit
Symbol V, units volts

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9
Q

Describe current

A

The flow of electrons in an electric circuit
Symbol I, units Ampere

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10
Q

Outline resistance

A

The materials property to resist the flow of electrons when a voltage is applied across the material.

It causes the electrical energy to be converted to heat energy

Symbol omega, units ohms

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11
Q

Factors effecting restistance

A

Length
Resistivity
Cross sectional area

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12
Q

Ohms law,

A

V=IR

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13
Q

Outline power

A

The rate at which electrical energy is converted into another form. Aka amount of work done
Measured in watts
P= VI

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14
Q

What are domains

A

Groups of atoms in a material that act like little magnets. If aligned the material will be a natural magnet. Domains in a un-magnetic material are aligned randomly.

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15
Q

2 types of magnets and explain each

A

Permanent- when field is removed domains do not return to original state
Temporary- when field removed domains revert back to original state

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16
Q

Magnetic force lines, Flux lines [8]

A

Do not cross
Elastic in nature
Acting in same direction repel
Acting in opposite direction attract
Form complete loops
Pass through all materials
Concentrate at poles
Travel from north to south

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17
Q

What’s left hand rule

A

To show which direction Flux lines travel in a moving current. As when a current moves through a conductor a magnetic field is set up

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18
Q

What direction do electrons flow

A

Negative to positive

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19
Q

Strength of solenoid depends on:[3]

A

● Number of turns of wire in coil
● Current flow in coil
● How concentrated the Flux lines are(increased by adding a core)

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20
Q

Solenoid is a…

A

Electromagnet

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21
Q

What properties does a solenoid have when current is flowing

A

Turns into an electromagnet and creates north and south poles

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22
Q

Define electromagnetic induction

A

Voltage is produced in a conductor when there is relative motion, between conductor and magnetic/electromagnetic field

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23
Q

3 methods of inducing EMF in a conductor

A

● relative motion of conductor in magnetic field (generator)
● self induction (inductors)
● mutual induction (transforming)

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24
Q

Define generator

A

A machine that converts mechanical energy into electrical energy using electromagnetic induction

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25
Q

Generators action

A

Single loop of wire rotated at a constant speed between poles of a magnet

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26
Q

Outline production of DC

A

Using a generator but slip rings are replaced by a commutator

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27
Q

2 types of voltage regulation

A

Carbon pile
Electronic

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28
Q

3 parts of a brushless generator

A

● permanent magnet gen
● excitation gen
● main gen

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29
Q

Define motor

A

A machine that converts electrical energy into mechanical enegery

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30
Q

How Operation of a motor in reference to Flux lines

A

Relies on the fact magnetic lines of force do not cross, therefore the motion is due to interaction between magnetic fields

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31
Q

Rwferncing motors, How does a conductor move in relation to the main field

A

At right angles

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32
Q

Outline Mutual inductance

A

Induction achieved when a changing magnetic Flux in one circuit induces an emf in another seperate circuit.

Noting: Flux must be changing so an emf can be induced

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33
Q

Purpose of tranfsormers

A

To step up or step down voltages to required levels.

Note: transformers are AC ONLY

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34
Q

In relation to transformers will the frequency change of the emf produced

A

No. The frequency will remain the same

35
Q

Outline isolating transformers

A

A safety device to protect the operator when equipment developes a phase fault. It stops the power ground through the operator.

36
Q

Define capacitors

A

A device to store energy in the form of an electrostatic field

A capacitor is a device that opposes the change of voltage in a circuit

37
Q

3 factors effecting a capacitor

A

Area
Distance
Dielectric material

38
Q

3 things impacting a solenoid

A

Number of turns in wire coil
Current flowing in coil
Concentration for Flux lines(increased by a core)

39
Q

Define an open loop servomechanism

A

Is one system that the initiating action is independent of the result obtained

Requires operator to monitor the output and adjust as necessary

40
Q

2 open loop servomech applications

A

Trim tabs
Search light

41
Q

Define closed loop aervomechanicsm

A

Desired result is compared to actual result, in the loop

Applications:
Aircraft flaps

42
Q

Define a relay

A

An electronic device, that unlike a solenoid, is used to open or close electrical connections remotely.

43
Q

Outline microswitches

A

A switch that has no internal adjustment and can only be done by moving the switch body

44
Q

Aircraft tradespers are responsible for what with microswitches

A

Fitting, setting, adjustments, and functional checks.

Avionics do: servicing switch, connecting and disconnecting, continuity checks

45
Q

In relation to HERP, most subspecialty organs are:

A

Eyes
Testes

46
Q

HERP stand for

A

Hazards of electromagnetic radiation of personnel

47
Q

HERF stands for..

A

Hazards of electromagnetic radiation to fuels

48
Q

HERO effects can be cured by

A

Restricting radio transmissions during handling ordances

Avoid aircraft in HIF
Hardening EEDs

49
Q

What does HERO stand for

A

Hazards of electromagnetic radiation to ordances

50
Q

Lightning effects can be mitigated by; [3]

A

● diverter strips
● arresters
●correct bonding

51
Q

P-static can be mitigated by… [3]

A

●static wicks/dischargers
●static wicks are connected to rest of aircraft through low impedence bonds
●observing good bonding practises

52
Q

HIRF stand for?

A

High intensity radiated field

53
Q

EMI stands for

A

Electromagnetic interference

54
Q

Symptoms of EMI, [5]

A

●degraded comms, radar and navigation
●nav errors, false readings
●warning light activation
●spontaneous movement of control surfaces
●interfers with engine controls

55
Q

E^3 Stands for

A

Electromagnetic environmental effects

56
Q

2 effects of EMI are:
And where is it found nzap…

A

Natural phenomena (esd, p-static, lightning)
Man made effects (radios)

Nzap6000 pt2, Lf B9.2

57
Q

2 sources of EMI

A

Intentional emitters
Unintentional emitters

58
Q

Outline Static dischargers

A

Develops charge when flies, aka p-static. Uses static wicks to discharge and reduce this effect

59
Q

Bonding vs earthing

A

Bonding is electrically connecting all conductive parts together to complete a electrical circuit, ensuring no PD between parts.

Earthling - process of physically connecting item to earth

60
Q

2 precautions when operating HEIU

A

● never touch output lead or ignitor plug when in op.
● safety man must be positioned where can warn others away during HEIU ops

61
Q

Hazards of Lox

A

When oxygen is exposed to oils and greases under pressure will spontaneously combust

62
Q

Expansion rate of Lox

A

862:1

63
Q

Procedure of major Lox spill [4]

A

● call fire
● clear area
●keep unauthed pers away
● extinguish fire properly

64
Q

Pitot static safety, safety precautions [6]

A

● never blow into pitotstatic
●always blank pipes when disconnected
●always fit protective blanks when on ground
●ensure heaters are off at all times
●ensure drain holes not blocked
●Carey out sense and leak test when required

65
Q

Pitot static safety, hazards to aircraft [4]

A

● water contamination
● blockage
● crossed pipelines
● loose pipelines

66
Q

EWIS inspection safety!

A

Prevent electric shock, ensure power is turned off before inspecting.

67
Q

Fibre optics safety question

A

Never look into Fibre optical light source or cable connected to light source. Cause damage to sight

68
Q

Fibre optical cable precuation

A

Ensure minimum bend radii is observed

69
Q

Connector, tradesman responsibility

A

Connection and disconnection of plugs when equipment is of mechanical nature

Nzap 6001-1, Lf D1

70
Q

Avionics wiring sys. Types of wiring diagrams

A

● location
● schematic
● routing (wiring)

71
Q

Automatic flight control system
AFCS purposes… [2]

A

● releive stress from pilot and mental fatigue
● automatic pilot will fly aircraft more stable than human

72
Q

Regarding AFCS, what are the 2 ACFT trade responsibilities…

A

● Rev, inst, serv, engine accessories
● Rev, inst, serv, pilot servos and connections to aircraft controls

73
Q

Problem with direct/wet reading compass

A

Become unreliable at high magnetic latitudes

74
Q

Gyro magnetic compass [direct indicating] 2 main errors are…

A

● magnetic field of aircraft structures
● acceleration errors

75
Q

Gyroscope handling during aircraft movement [2]

A

● do not move unless gyro at full speed or stopped
● cage gyro if applicable

76
Q

Gyroscope handling precautions, transportation [3]

A

● handle with care
● lift gyro base, 2 hands,
● secure in appropriate transit case

77
Q

Horizontal gyro is used where

A

Directional

78
Q

What gyro in artifical horizon

A

Verticle gryo

79
Q

Outline capacitive fuel sys

A

Probes, in tank connected in parallel to provide an average value regardless of aircraft attitude

80
Q

Tachometer consists of 2 main units

A

Transimtter - Tachometer gen
Indicator - rpm guage

81
Q

Landing gear indicated posisitons

A

● up and locked
● in transit
● down and locked

82
Q

Landing gear, types of indicators

A

● red and green light assy
● dolls eyes
● mechanical indicator

83
Q

Advantages of remote indicating sys [2]

A

No hazardous fluids in cockpit

Weight saving

Avionics (1 decks)

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