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Everything Flashcards

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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
Generators action
Single loop of wire rotated at a constant speed between poles of a magnet
26
Outline production of DC
Using a generator but slip rings are replaced by a commutator
27
2 types of voltage regulation
Carbon pile Electronic
28
3 parts of a brushless generator
● permanent magnet gen ● excitation gen ● main gen
29
Define motor
A machine that converts electrical energy into mechanical enegery
30
How Operation of a motor in reference to Flux lines
Relies on the fact magnetic lines of force do not cross, therefore the motion is due to interaction between magnetic fields
31
Rwferncing motors, How does a conductor move in relation to the main field
At right angles
32
Outline Mutual inductance
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
33
Purpose of tranfsormers
To step up or step down voltages to required levels. Note: transformers are AC ONLY
34
In relation to transformers will the frequency change of the emf produced
No. The frequency will remain the same
35
Outline isolating transformers
A safety device to protect the operator when equipment developes a phase fault. It stops the power ground through the operator.
36
Define capacitors
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
3 factors effecting a capacitor
Area Distance Dielectric material
38
3 things impacting a solenoid
Number of turns in wire coil Current flowing in coil Concentration for Flux lines(increased by a core)
39
Define an open loop servomechanism
Is one system that the initiating action is independent of the result obtained Requires operator to monitor the output and adjust as necessary
40
2 open loop servomech applications
Trim tabs Search light
41
Define closed loop aervomechanicsm
Desired result is compared to actual result, in the loop Applications: Aircraft flaps
42
Define a relay
An electronic device, that unlike a solenoid, is used to open or close electrical connections remotely.
43
Outline microswitches
A switch that has no internal adjustment and can only be done by moving the switch body
44
Aircraft tradespers are responsible for what with microswitches
Fitting, setting, adjustments, and functional checks. Avionics do: servicing switch, connecting and disconnecting, continuity checks
45
In relation to HERP, most subspecialty organs are:
Eyes Testes
46
HERP stand for
Hazards of electromagnetic radiation of personnel
47
HERF stands for..
Hazards of electromagnetic radiation to fuels
48
HERO effects can be cured by
Restricting radio transmissions during handling ordances Avoid aircraft in HIF Hardening EEDs
49
What does HERO stand for
Hazards of electromagnetic radiation to ordances
50
Lightning effects can be mitigated by; [3]
● diverter strips ● arresters ●correct bonding
51
P-static can be mitigated by... [3]
●static wicks/dischargers ●static wicks are connected to rest of aircraft through low impedence bonds ●observing good bonding practises
52
HIRF stand for?
High intensity radiated field
53
EMI stands for
Electromagnetic interference
54
Symptoms of EMI, [5]
●degraded comms, radar and navigation ●nav errors, false readings ●warning light activation ●spontaneous movement of control surfaces ●interfers with engine controls
55
E^3 Stands for
Electromagnetic environmental effects
56
2 effects of EMI are: And where is it found nzap...
Natural phenomena (esd, p-static, lightning) Man made effects (radios) Nzap6000 pt2, Lf B9.2
57
2 sources of EMI
Intentional emitters Unintentional emitters
58
Outline Static dischargers
Develops charge when flies, aka p-static. Uses static wicks to discharge and reduce this effect
59
Bonding vs earthing
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
2 precautions when operating HEIU
● never touch output lead or ignitor plug when in op. ● safety man must be positioned where can warn others away during HEIU ops
61
Hazards of Lox
When oxygen is exposed to oils and greases under pressure will spontaneously combust
62
Expansion rate of Lox
862:1
63
Procedure of major Lox spill [4]
● call fire ● clear area ●keep unauthed pers away ● extinguish fire properly
64
Pitot static safety, safety precautions [6]
● 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
Pitot static safety, hazards to aircraft [4]
● water contamination ● blockage ● crossed pipelines ● loose pipelines
66
EWIS inspection safety!
Prevent electric shock, ensure power is turned off before inspecting.
67
Fibre optics safety question
Never look into Fibre optical light source or cable connected to light source. Cause damage to sight
68
Fibre optical cable precuation
Ensure minimum bend radii is observed
69
Connector, tradesman responsibility
Connection and disconnection of plugs when equipment is of mechanical nature Nzap 6001-1, Lf D1
70
Avionics wiring sys. Types of wiring diagrams
● location ● schematic ● routing (wiring)
71
Automatic flight control system AFCS purposes... [2]
● releive stress from pilot and mental fatigue ● automatic pilot will fly aircraft more stable than human
72
Regarding AFCS, what are the 2 ACFT trade responsibilities...
● Rev, inst, serv, engine accessories ● Rev, inst, serv, pilot servos and connections to aircraft controls
73
Problem with direct/wet reading compass
Become unreliable at high magnetic latitudes
74
Gyro magnetic compass [direct indicating] 2 main errors are...
● magnetic field of aircraft structures ● acceleration errors
75
Gyroscope handling during aircraft movement [2]
● do not move unless gyro at full speed or stopped ● cage gyro if applicable
76
Gyroscope handling precautions, transportation [3]
● handle with care ● lift gyro base, 2 hands, ● secure in appropriate transit case
77
Horizontal gyro is used where
Directional
78
What gyro in artifical horizon
Verticle gryo
79
Outline capacitive fuel sys
Probes, in tank connected in parallel to provide an average value regardless of aircraft attitude
80
Tachometer consists of 2 main units
Transimtter - Tachometer gen Indicator - rpm guage
81
Landing gear indicated posisitons
● up and locked ● in transit ● down and locked
82
Landing gear, types of indicators
● red and green light assy ● dolls eyes ● mechanical indicator
83
Advantages of remote indicating sys [2]
No hazardous fluids in cockpit Weight saving

Avionics (1 decks)

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