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324 Aircraft Systems > Block Exam > Flashcards

Block Exam Flashcards

1
Q

What are the 2 types of Current electricity?

A
  1. Alternating Current (AC)

2. Direct Current (DC)

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2
Q

What are the 2 types of Electricity?

A
  1. Static - not often useful

2. Current - AC/DC

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3
Q

How is Current electricity produced?

A
  • Electrons move through a circuit and perform work
    1. Magnetic Field
    2. Heat Generation
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4
Q

What type of electricity does an Alternator use?

A

AC

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5
Q

What kind of electricity comes a battery?

A

DC

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6
Q

What type of electricity would an energy storage device for remote starting have?

A

DC

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7
Q

What are the 6 ways we can PRODUCE energy?

A
  1. Friction
  2. Heat
  3. Light
  4. Pressure
  5. Chemical Reaction
  6. Magnetism
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8
Q

What is Thermocoupling?

A
  • A loop of different metals with 2 junctions

- Electric current will flow through wires when there is a temperature differential

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9
Q

Explain Light energy. Is there anything in out aircraft that uses this?

A
  • Light is energy
  • When light strikes photoemissive materials, electrons are forced to scatter and do work
    Ex: PFD!
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10
Q

Explain Pressure energy. What is 1 example?

A
  • When a material with Piezoelectricity is bent/deformed by a mechanical force
  • Excess of electron accumulation on the surface
    Ex: Record Player
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11
Q

Explain Chemical energy

A

An imbalance of electrons (E will move from high to low, being forced through a conductor which creates a chemical reaction)

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12
Q

What is 1 coulomb?

A
  • An electrical quantity

- 6.28 x 10 to the 18th power

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13
Q

1 ____ is the movement of 1 coulomb per second

A

1 amp = movement of 1 coulomb per second

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14
Q

What is the measurement of flow/current?

A

Amps

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15
Q

1 ____ is the resistance through which 1 volt can force 1 amp (to flow)

A

1 ohm = resistance through which 1 volt can force 1 amp

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16
Q

What is the measurement of resistance?

A

Ohms

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17
Q

What is the measurement of pressure?

A

Volts

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18
Q

1 HP = _____ (mechanical)

A

33,000 ft/lbs per minute (mechanical)

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19
Q

1 HP = _____ (electrical)

A

746 watts

20
Q

If you have a 110 volt/9 amp motor, how many Watts is it?

A

110 x 0.9 = 99 Watts

21
Q

What is the equation for calculating Watts?

A

Watts = Volts x Amps

22
Q

What kinds of electricity is found in wall socket outlets?

A

AC

23
Q

What kind of electricity do our laptops utilize?

A

DC

24
Q

What is a TRU? What does it do?

A
  • Transformer Rectifying Unit

- Transforms AC to DC

25
Q

Will you ever have AC batteries?

A

NO

26
Q

What is the equation for Amps?

A

Amps = Volts/Resistance

- Current/flow is directly proportional to pressure, and inversely proportional to resistance

27
Q

True of False: Current can only flow one direction.

A

TRUE

28
Q

______ Current is constantly changing in direction (phase) and amplitutde

A

Alternating Current (AC)

29
Q

___ Current is based on the flow in ONE direction (- or +)

A

Direct Current (DC)

30
Q

Simply put, what is a battery?

A

An energy storage device!

- Device composed of 1+ cells in which CHEMICAL energy is converted into ELECTRICAL energy

31
Q

What kind of batteries ARE rechargable?

A

Secondary Cell Batteries (vs Primary Cell)

32
Q

What is RATED Capacity?

A
  • Indicates a battery’s ability to perform when it is new

pg 182

33
Q

What 3 things affect charge?

A

idk

34
Q

What 2 things will affect the Condition of a battery?

A

Degraded by:

  1. Age
  2. G-Force stress
35
Q

Explain Series Circuits (pg 210) DRAW IT

A
  • ALL electrons must flow through ALL active components
36
Q

Explain Parallel Circuits (pg 210) DRAW IT

A
  • A portion of current flows through each filament
37
Q

AIRCRAFT electrical system. What are the 6 main components?

A

(pg 213-220)

  1. The source of power (12v Negative Ground - Negative terminal of battery is connected to the air frame)
  2. Master Solenoid/Switch (Way to isolate the battery from rest of electrical system)
  3. Starter Circuit (Electrons flow from battery and through the Starter Motor Circuit and Control Circuit in a constant loop)
  4. The Busbar (Circuit breakers installed/mounted on a busbar)
  5. Individual Working Circuits (connected through busbar, protected by circuit breaker, controlled by a switch)
  6. The Alternator (E pump)
38
Q

Alkaline, carbon zinc, and lithium ion are examples of what type of battery?

A

Primary (dry) cell batteries

39
Q

Lead acid and nickel-cadmium (NiCad) are examples of what type of battery?

A

Secondary (wet) cell batteries

~ Rechargeable

40
Q

What 3 things will affect ACTUAL Capacity of a battery?

A
  1. Battery Temperature
  2. Battery State of Charge
  3. Battery Condition
41
Q

Battery condition is degraded by what 2 things?

A
  1. Age

2. G-Force

42
Q

Explain what happens with a Thermal Runaway

A
  • Rise in battery temperature leading to rise in current
  • The battery begins to accept ALL of the charging current the source is capable of producing
  • Battery gets so hot that it may explode or melt
43
Q

What are 4 general facts about Generators?

A
  • AC or DC Generators
  • Stationary magnets, rotating conductor/coil
  • Simpler, easier to control
  • Most common in Turbine engine a/c
44
Q

Describe an AC Generator. What are its main components? What 3 things does current output depend on?

A
  • 1 conductor/coil formed into a loop with ends attached to SLIP RINGS
  • Brush
  • Sine Wave (output) varies
  • Amount of current produced depends on:
    1. # of lines of flux
    2. # of conductors cutting the flux
    3. Speed at which conductors move through the flux
45
Q

Describe a DC Generator. What are its main components?

A
  • Ends of conductor/coil are attached to a SPLIT RING
  • Negative and Positive Brush
  • AC is generated in the coil/armature and SPLIT RING commutator causes E flow through LOAD to all be in 1 direction
  • Commutator creates the pulseating DC output
46
Q

What are the 2 basic types of batteries? What makes them different?

A
  1. Primary - Cannot be recharged

2. Secondary - Rechargeable

324 Aircraft Systems (3 decks)

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