Lesson 6 Review

Question 1

“The RATE at which the MAGNETIC lines of FLUX are CUT” describes what?

Answer 1

Generator output/ amount of CURRENT produced

Question 2

What affects the RATE the lines of FLUX are cut?

Answer 2

1. Armature rotation speed
2. Armature windings
3. # of Flux lines

Question 3

Where does the current for the field windings come from?

Answer 3

Generator output

Question 4

How do Voltage Regulators work?

Answer 4

All control is done through the FIELD

Control the FIELD, control the OUTPUT

Question 5

Adjusting the RHEOSTAT will control the field current for this type of regulator

Answer 5

MANUAL Regulation

Question 6

What is specific to the VIBRATOR type Voltage Regulator?

Answer 6

Voltage Coil
Contact Points
Adjustment Spring

Question 7

Field current is controlled by the resistance of the CARBON pile on this type of regulator

Answer 7

Carbon Pile Voltage Reg.

Question 8

Solid State Voltage Regulators use what?

Answer 8

Transistorized VR

Question 9

Describe DC Generator Paralleling

Answer 9

Multiple power sources power busses

VR adjusted so both GEN. provide EQUAL amount of current to bus

Question 10

This type of paralleling must have their FREQ. and PHASES aligned

Answer 10

AC Generator Paralleling

Question 11

What will prevent the battery from discharging through a failed generator?

Answer 11

REVERSE CURRENT RELAY will isolate the GEN from the bus

Question 12

How does a REVERSE CURRENT RELAY work?

Answer 12

When GEN voltage DROPS, direction of current in the current coil REVERSES = weakened combine fields = OPEN contact points = GEN iso from bus

Question 13

This component prevents the GEN from delivering high current loads that causes damage and heat

Answer 13

CURRENT LIMITER

Question 14

How does the CURRENT LIMITER work?

Answer 14

HIGH current through current limiter COIL = mag field around the coil OPENS contacts = REMOVE field current = GEN output drop

Question 15

The point where the BRUSHES make contact with the COMMUTATOR where no current is being induced in the WINDING is called?

Answer 15

NEUTRAL PLANE (winding PARALLEL to field)

Question 16

Aircraft Generator have which major components?

Answer 16

Armature Assmebly
Field Frame Assembly
Brush Assmebly
End Frames

Question 17

Difference between DC GEN and DC ALT?

Answer 17

GSM

ARM

Question 18

This component consists of Wire coils and laminated soft iron. As the ARMATURE assembly rotates within the MAG field CURRENT is induced in the WINDING

Answer 18

Armature Assembly

Question 19

What do we inspect on brushes and commutators?

Answer 19

Wear/Tear for Brush condition

Spring Tension

Question 20

What do BEARINGS do?

Answer 20

Allows the SHAFT to rotate freely with min. friction

Question 21

For Belts and Drives M2 use what? What about M1?

Answer 21

M2: SPLINE SHAFT via gearbox/CSD
M1: BELT DRIVE

Question 22

What do we look for during BELT maintenance?

Answer 22

CONDITION (crack, oil, glaze, torn)
TENSION (reduced output, excessive = bearing strain)
ALIGNMENT (bearing failure)

Question 23

If SLIP RINGS are used to deliver ARMATURE current to the brushes, what is the component?

Answer 23

AC GENERATOR

Question 24

DC GENERATORS use what to deliver ARMATURE current to the brushes?

Answer 24

COMMUTATOR RING

Question 25

FREQ of GEN output depends on what?

Answer 25

Armature rotation SPEED

Question 26

Describe ARMATURE REACTION

Answer 26

SHIFTS the neutral plane in direction of rotation