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Exam Review 2 Flashcards

1
Q

Purpose of a SEPARATOR in a Nicad?

A

Prevent SHORTS, allow CURRENT/ionic flow between opposing polarity plates

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2
Q

SG of Nicad?

A

1.24 - 1.32

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3
Q

Nicad state of charge?

A

140% of Amp/H rating

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4
Q

Basic charging procedure for NICAD

A
  1. Charge
  2. Capacity Check
  3. Recharge or Deep Cycle
  4. Serviceable
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5
Q

Definition of DEEP cycle?

A
  • Leakage Current over 100mA
  • Shorting all cells
  • Fully Discharged
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6
Q

Define Capacity test?

A
  • Less than 100mA
  • Discharging
  • If ANY cell drops below 1V = fail
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7
Q

Purpose of SUMP JAR and what is inside?

A

NEUTRALIZES discharged gasses, contains discharged gasses

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8
Q

Describe Alternator construction

A
  • EM induction
  • ARM
  • Current into STATOR
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9
Q

Describe generator construction

A
  • EM induction
  • GSM
  • Current into windings
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10
Q

How do ALTERNATORS generate electricity?

A

Induction into winding as field rotates PAST the stator

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11
Q

How do GENERATORS generate electricity?

A

Induction into winding as ARMATURE rotate WITHIN mag fiel

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12
Q

Identify ALT/GEN by sight

A

??

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13
Q

Describe field winding

A
  • More winding means SMOOTHER frequency
  • ## Current thru this changes output voltage
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14
Q

Describe AC/DC voltage electricity and frequency

A

M2: 115/208 VAC
M1: 28VDC
400 Hz

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15
Q

Purpose of a CSD?

A
  • Maintain output freq

- Maintain RPM to drive Gen/Alt speed

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16
Q

Describe IDG

A
  • Combines CSD and Gen/Alt
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17
Q

Describe starter gen

A
  • a motor at START

- an EDG once engine running

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18
Q

Describe operation of EXTERNAL POWER?

A

Supply electrical power to entire aircraft (no sharing)

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19
Q

Where is EXTERNAL POWER receptacle?

A

Nose wheel well

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20
Q

Describe the operation voltage regulator

A

All control is done through the FIELD

Control the FIELD control the OUTPUT

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21
Q

Usage of unregulated frequency?

A

??

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22
Q

3 factors that affect the rate which LINES of FLUX are being cut?

A
  1. Armature rotation SPEED
  2. # of Armature WINDINGS
  3. # of FLUX lines
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23
Q

Describe DC gen paralleling

A
  • Busses powered by multiple sources

- Equal CURRENT to buss thru GEN after Vregulation

24
Q

AC paralleling?

A

PHASE and FREQUENCY aligned

25
What is a REVERSE CURRENT RELAY?
Isolates the GENERATOR from the bus to prevent battery discharge
26
Describe NEUTRAL PLANE
BRUSHES make contact with the COMMUTATOR where no current is being induced in the WINDING (winding parallel to field)
27
What is ARMATURE REACTION?
SHIFTS the neutral plane in direction of rotation
28
How does ARMATURE REACTION fluctuate/change?
- More current in the ARMATURE (change) | - Compensation/Interpoles (maintain)
29
Major components of ALT/GEN
Armature Assembly Field Frame Assembly Brush Assembly End Frames
30
Gen/Alt maintenance?
Bearin, belts, fans, brushes
31
How is AC gen frequency controlled?
ARMATURE speed of rotation
32
Describe VSCF
- gearbox driven - AC to AC - Solid state
33
Main feature of VSCF
Brushless = less maintenance
34
Describe GCU?
monitors and controls generator operation in one central control unit
35
Where are most GCU controls??
Central control unit
36
Describe hot/ground side of GCU?/
Hot (power) | Ground (return)
37
Describe CURRENT TRANSFORMER and purpose
measures the amount of CURRENT in a conductor through INDUCTION into a SECONDARY conductor
38
Describe feeder fault
GCU fault, opens field circuit
39
Describe load shedding
Dropping non essential busses
40
Describe flashing the field
EXTERNAL CURRENT through the FIELD WINDING | - residual magnetism
41
When do we flash the field?
New Gen/Dormant gen
42
Factors affecting TORQUE
- Strength of mag field - Coil turns - Coil position
43
How do we affect direction and speed in a DC motor
1. Reverse polarity 2. current/EMF (speed) 3. Reverse current (direction)
44
Commutation?
- maintains torque direction | - reverse when coil bout to STOP
45
Describe transformer??
increase or decrease the VOLTAGE in an AC circuit
46
Describe step up and step down transformer and what happens
Step Down: fewer secondary winding | Step up: greater secondary winding
47
Phase relationship between input and output of transformer?
180 lag between primary and secondary voltage
48
Purpose of INVERTER
DC to AC emergency power
49
Rectifier look?
TRU
50
Describe a BUSS
Carry electrons to/from load circuits
51
Describe a SPLIT BUSS
ONE gen to one BUSS | bus transfer system for protection
52
PARALLEL BUS?
MULTIPLE gen to SAME buss
53
SPLIT PARALLEL BUS
both to operate independently uses a SPLIT SYSTEM BREAKER
54
GENERATOR or bus tie breaker
RELAY (high current loads)
55
When using GPU what happens to aircraft power?
Can't use it

Power Gen Review (9 decks)

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