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Power Gen Review > Exam Review 2 > Flashcards

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
Q

What is a REVERSE CURRENT RELAY?

A

Isolates the GENERATOR from the bus to prevent battery discharge

26
Q

Describe NEUTRAL PLANE

A

BRUSHES make contact with the COMMUTATOR where no current is being induced in the WINDING (winding parallel to field)

27
Q

What is ARMATURE REACTION?

A

SHIFTS the neutral plane in direction of rotation

28
Q

How does ARMATURE REACTION fluctuate/change?

A
  • More current in the ARMATURE (change)

- Compensation/Interpoles (maintain)

29
Q

Major components of ALT/GEN

A

Armature Assembly
Field Frame Assembly
Brush Assembly
End Frames

30
Q

Gen/Alt maintenance?

A

Bearin, belts, fans, brushes

31
Q

How is AC gen frequency controlled?

A

ARMATURE speed of rotation

32
Q

Describe VSCF

A
  • gearbox driven
  • AC to AC
  • Solid state
33
Q

Main feature of VSCF

A

Brushless = less maintenance

34
Q

Describe GCU?

A

monitors and controls generator operation in one central control unit

35
Q

Where are most GCU controls??

A

Central control unit

36
Q

Describe hot/ground side of GCU?/

A

Hot (power)

Ground (return)

37
Q

Describe CURRENT TRANSFORMER and purpose

A

measures the amount of CURRENT in a conductor through INDUCTION into a SECONDARY conductor

38
Q

Describe feeder fault

A

GCU fault, opens field circuit

39
Q

Describe load shedding

A

Dropping non essential busses

40
Q

Describe flashing the field

A

EXTERNAL CURRENT through the FIELD WINDING

- residual magnetism

41
Q

When do we flash the field?

A

New Gen/Dormant gen

42
Q

Factors affecting TORQUE

A
  • Strength of mag field
  • Coil turns
  • Coil position
43
Q

How do we affect direction and speed in a DC motor

A
  1. Reverse polarity
  2. current/EMF (speed)
  3. Reverse current (direction)
44
Q

Commutation?

A
  • maintains torque direction

- reverse when coil bout to STOP

45
Q

Describe transformer??

A

increase or decrease the VOLTAGE in an AC circuit

46
Q

Describe step up and step down transformer and what happens

A

Step Down: fewer secondary winding

Step up: greater secondary winding

47
Q

Phase relationship between input and output of transformer?

A

180 lag between primary and secondary voltage

48
Q

Purpose of INVERTER

A

DC to AC emergency power

49
Q

Rectifier look?

A

TRU

50
Q

Describe a BUSS

A

Carry electrons to/from load circuits

51
Q

Describe a SPLIT BUSS

A

ONE gen to one BUSS

bus transfer system for protection

52
Q

PARALLEL BUS?

A

MULTIPLE gen to SAME buss

53
Q

SPLIT PARALLEL BUS

A

both to operate independently uses a SPLIT SYSTEM BREAKER

54
Q

GENERATOR or bus tie breaker

A

RELAY (high current loads)

55
Q

When using GPU what happens to aircraft power?

A

Can’t use it

Power Gen Review (9 decks)

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