Aviation Electricity And Electronics-Power Generation And Distribution; Ch1

Front 1

What are the advantages of using transformers and transformer rectifiers vice inverters and dynamotors for supplying aircraft power?

Back 1

lightweight, simple, and reliable

Front 2

What power system requirements do modern
naval aircraft have?

Back 2

three-phase, 120-/208-volt, 400-hertz (Hz) ac power system

Front 3

What determines the voltage frequency of an
ac generator?

Back 3

The number of magnetic poles and rotor revolutions per
minute (rpm)

Front 4

What are the two types of ac generators?

Back 4

brush-type or brushless

Front 5

What supplies the output ac power of a generator?

Back 5

The stator (stationary armature winding)

Front 6

How many phases is an ac generator?

Back 6

three

Front 7

What are the advantages of a brushless generator
over a brush-type generator?

Back 7

increased reliability and greater operating time
between overhaul

Front 8

What is a prime mover?

Back 8

A device, such as an aircraft engine, that provides
the driving force for a generator, is a prime mover.

Front 9

What is the purpose of a CSD?

Back 9

convert variable engine speed to a constant speed output
(It holds the frequency steady to within a few hertz of the desired 400 Hz)

Front 10

What are inverters?

Back 10

an emergency source of ac power
when normal ac power fails

Front 11

In an inverter, what converts electrical energy
to mechanical energy?

Back 11

dc motor

Front 12

On what does the rating of an aircraft inverter
depend?

Back 12

the equipment that it supplies

Front 13

What is the purpose of a transformer?

Back 13

to take electrical energy in the form of an ac voltage and
convert it to a different usable ac voltage

Front 14

What is the function of a transformer
rectifier?

Back 14

to provide the necessary dc voltage for lighting and controlling ac-powered equipment

Front 15

What is the only moving part in a transformer
rectifier?

Back 15

cooling fan

Front 16

What is the difference between an autotransformer
and an ordinary transformer?

Back 16

it has one winding that is common to both primary and secondary windings

Front 17

Autotransformers offer savings in both size
and costs over conventional units. When are
these savings greatest?

Back 17

when the turn ratio is less than 2:1 (either step-up or step-down)

Front 18

What are the two general types of instrument
transformers?

Back 18

the current and the potential

Front 19

What are the ways in which emergency power
is supplied to naval aircraft?

Back 19

aircraft storage batteries, auxiliary power units, and
hydraulic motor driven generators

Front 20

What components maintain the aircraft (a/c)
storage battery in a charged state?

Back 20

ac generator and transformer-rectifier combination

Front 21

What are the two most common types of a/c
storage batteries in use today and what are
the colors of each?

Back 21

lead-acid (red)
nickel-cadmium (blue)

Front 22

What manual is used for information on
securing, storing, servicing, and handling a/c
storage batteries?

Back 22

NAVAIR 17-15BAD-1

Front 23

On a VLAB, what is the purpose of the vent
nozzles?

Back 23

provides definite pressure on the battery while in flight.

Front 24

The sump jar of a VLAB system contains a felt
pad moistened with what?

Back 24

concentrated solution of sodium bicarbonate (for neutralizing gases and excess battery solution)

Front 25

What type of electrolyte is used in a SLAB?

Back 25

a dilute mixture of sulfuric acid and water

Front 26

In a SLAB, how is electrolyte immobilization
accomplished?

Back 26

by a gel or by absorption of electrolyte into special glass mats that replace or supplement separators

Front 27

What is considered the fundamental unit of a
NICAD battery?

Back 27

the cell

Front 28

What are the types of cells used in NICAD
batteries?

Back 28

vented and sealed

Front 29

What is the nominal value of a NICAD battery
cell?

Back 29

1.26 volts

Front 30

Why can the hydraulic driven emergency
generator only power a small number of circuits?

Back 30

The kVA rating is much lower than the primary generator

Front 31

What causes the rotor in the generator to
turn?

Back 31

hydraulic motor

Front 32

What helps to maintain generator output frequency?

Back 32

hydraulic motor converts 3,000 pounds per
square inch of hydraulic pressure to constant-speed
rotation, maintaining generator output frequency at 400
Hz

Front 33

How is the generator cooled?

Back 33

hydraulic fluid

Front 34

What is the purpose of the motor-generator
control?

Back 34

provides voltage regulation
for, and fault detection of, motor-generator output

Front 35

What is the function of the solenoid control
valve?

Back 35

controls the operation of the
emergency electrical power system

Front 36

What is the function of an APU?

Back 36

-

Front 37

What is needed for APU starting?

Back 37

-

Front 38

On a GTCP-95, what drives the generator?

Back 38

-

Front 39

What are the two main sections of an APU?

Back 39

-

Front 40

The electrical system of an APU consists of
what components?

Back 40

-

Front 41

APU ignition cuts out at what rpm?

Back 41

-

Front 42

What is the purpose of the centrifugal speed
switch assembly?

Back 42

-

Front 43

How many sub-switches make up the
centrifugal speed switch assembly?

Back 43

-

Front 44

How are the centrifugal speed switches
adjusted?

Back 44

-

Front 45

What are the functions of each switch?

Back 45

-

Front 46

Changing the setting of the 35% switch also
affects what?

Back 46

-

Front 47

How does the 106% switch shut down the
APU?

Back 47

-

Front 48

At what rpm is the starter disengaged?

Back 48

-

Front 49

What could happen to the starter if the
dropout relay fails?

Back 49

-

Front 50

Why do we use external electrical power on
aircraft?

Back 50

-