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AT 202 > Exam 1 Big Review > Flashcards

Exam 1 Big Review Flashcards

1
Q

Left hand rule

A

thumb points with current, fingers show magnetic field

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2
Q

left hand rule (generators)

A

thumb shows force direction
index for magnetic field
middle finger for direction of current

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3
Q

conductor

A

gives atoms, nearly empty shell

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4
Q

insulator

A

takes atoms, nearly full shell

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5
Q

Control device

A

controls flow of current

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6
Q

power producer

A

produces current

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7
Q

power consumer

A

uses current

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8
Q

resistors have what purpose

A

stop current to maintain stable resistance in various environments

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9
Q

transformer

A

increases or decreases AC voltage in a circuit

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10
Q

relay disadvantages

A

big heavy, slow, uses a lot of power

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11
Q

solenoid advantages

A

stronger, carries higher current

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12
Q

point of shielded wire

A

shields electrical interference - used for audio signal and high frequency

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13
Q

why is solder flux used

A

prevents oxidation in solder

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14
Q

wet cells are used in

A

aircraft, automotive, standby telecommunications

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15
Q

VRLA battery advantage

A

low maintenance, cannot spill

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16
Q

Gel Cell usage

A

acrobatic aircraft

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17
Q

gel cells

A

recombinant battery (produces water) but needs pressure relieve valve

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18
Q

lead-acid battery usage

A

smaller aircraft

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19
Q

lead-acid battery characteristics

A

less expensive, bad power to weight ratio

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20
Q

nickle cadmium battery usage

A

turbine aircraft

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21
Q

nickel cadmium battery advantages

A

greater power to weight ratio
closed circuit voltage (near constant until dead)

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22
Q

lithium ion battery usage

A

portable electronics

23
Q

lithium ion battery advantages

A

no memory effect, best weight - energy ratio, higher voltages

24
Q

potential problems with lithium ion batteries

A

thermal runaway

25
Q

generator armature

A

rotates
carries current

26
Q

generator field

A

stationary
magnetic field

27
Q

generator commutator

A

changes AC to DC

28
Q

generator brushes

A

electrical contacts allowing current path for power to leave

29
Q

alternator field

A

rotates, creates magnetic field

30
Q

alternator armature

A

stator, produces voltage

31
Q

alternator rectifier

A

changes AC to DC with diodes

32
Q

3 Phase power advantage

A

constant power supplied
provides greater power density at same amperage
smaller wires, lighter load, lower cost

33
Q

why is Alt > Gen

A

lighter, cheaper, more reliable, less maintenance needed

34
Q

what does a regulator do

A

controls field strength to keep generator output at necessary volt/current for variable load

35
Q

regulator inputs

A

mechanical / electrical energy

36
Q

regulator output

A

voltage / current from armature

37
Q

vibrator regulator

A

older, uses electromagnet

38
Q

regulator transistor advantages

A

cheaper, lighter, more reliable, longer MTBF
smaller input controls larger output
uses control valve

39
Q

zener diode

A

voltage sensitive
controls transistors
no moving parts

40
Q

load meter

A

measures alternator current
starts at zero
shows load on alternator

41
Q

ammeter

A

zero in center, shows charging rate

42
Q

series

A

one current path
constant CURRENT

43
Q

parallel

A

more than one current path ( divided flow )
constant VOLTAGE

44
Q

DC current usages

A

batteries, portable/movable systems
CONSTANT POLARITY

45
Q

AC usages

A

houses, large aircraft
POLARITY CHANGES

46
Q

rectifier

A

AC to DC

47
Q

inverter

A

DC to AC
(complex and expensive)

48
Q

DC advantages

A

portable
backup power
starts engine

49
Q

AC advantages

A

easily converted
three phase gives more power

50
Q

single wire used

A

in metal aircraft

51
Q

two wire used

A

in composite aircraft

52
Q

which type of aircraft needs a ground conductor

A

composite aircraft

53
Q

Bus hierarchy

A

most important bus least likely to lose electrical power
hot battery bus always connected to battery

AT 202 (6 decks)

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