Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

AT 202 > Exam 2 Big Review > Flashcards

Exam 2 Big Review Flashcards

1
Q

What are the two types of constant RPM generators

A

CSD and IDG

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

output for constant rpm generators

A

voltage 115V AC
Frequency 400 Hz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the CSD

A

constant speed drive
installed between variable speed engine and constant speed generator
older aircraft

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what is IDG

A

integrated drive generator
generator and speed control in one unit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

IDG advantages

A

reduces weight and size
higher rpm and higher power output
higher alternator speed
improved cooling features

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

similarities of CSD and IDG

A

line replaceable units
both use oil / share oil with AC generator

(generator uses oil for cooling
CSD uses oil for operating the hydraulic transmission)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Variable RPM generator outputs

A

115 V AC
Hz may change
VSCF - 400 Hz
VSVF - changes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

VSCF advantage

A

no CSD
smaller/lighter
more versatile installation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

VSCF disadvantage

A

low power output
not as proven long term

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

VSVF advantage

A

no CSD or IDG
high power output
AC frequency made constant as needed during power distribution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

parallel bus

A

electrical load shared equally by all working generators
connected by syncing bus
can be labor intensive for flight engineer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

is apu operable on a parallel bus

A

not flight operable
ground only

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

split bus

A

generator powers one main AC bus
two generators can never power same bus
by closing breakers, one generator can power busses

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

are APUs operable in split bus

A

most are

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

split parallel power system

A

safer
parallel - normal operations
split - isolated during malfunction
split systems breaker closed during normal flight (connects left and right side busses/generators)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Split bus aircraft

A

A-320
A-310
B747
B777
B737

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

what is a RAT

A

ram air turbine
backup power source providing limited electrical if all engines are lost

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Static inverter

A

most critical AC power source
changes DC to AC with battery power
must be checked each night

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

A/C with parallel bus

A

B727
early B747

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

purpose of nitrogen generator

A

removes oxygen from system to avoid potential fires or extinguish fire

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

B787 electric replacements

A

electric starters
cabin air conditioning
pressurization
motor driven hydraulic actuators
electro/hydraulic control surface actuators
nitrogen generation system
transformer rectifier

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

aircraft with split parallel

A

modern B747

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What is fluid power

A

transmission and conversion of power using a fluid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Gas vs Liquid fluid power

A

Gas: compressible, low efficiency
Liquid: non compressible, high efficiency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Boyle’s Law

A

PV/T = PV/T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Pascal’s Law

A

when a force is exerted on a confined fluid, the resultant pressure is transmitted equally in all directions

force can be transmitted to remote units without significant energy loss

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

What is unit pressure

A

force on one unit of area (PSI)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

stroke

A

distance piston moves in a cylinder (in)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

volume

A

quantity of fluid contained (in^3)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

Principle of fluid power

A

F=PA
force = pressure x area
V=AL
volume = area x length

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

Mechanical advantage

A

amount by which applied effort is multiplied in output of device

net gain in force by sacrificing movement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

how does mechanical advantage work

A

F/A = F/A
the lifting force of a hydraulic jack is amplified directly by the ratio of the surface area of the two pistons

if two cylinders are connected by an incompressible fluid, and a given amount of pressure is applied to one cylinder, that same pressure is imparted to the second cylinder through the fluid connecting them. However, because pressure is equal to force per unit area, the cylinder that has a larger area will experience a force multiplication effect. Even though the pressure on both cylinders is the same, the force which is produced on the larger cylinder will be higher, proportionally higher based on the area of the cylinder.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

Desired properties for hydraulic fluid

A

low viscosity
stable structure in all temperatures (don’t want different viscosity at different temperature(
high flash and fire point (don’t want vapors igniting)
High chemical stability (resist oxidation and deterioration)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

Vegetable fluid

A

castor oil and alcohol
blue-blue green
extremely flammable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

Mineral fluid

A

petroleum distillate
red
flammable
uses synthetic rubber seals

36
Q

synthetic fluid

A

phosphate ester
(skydrol)
used for high pressure/temperature applications
anti-fire/low flammability
damaging to skin, wiring, paint, lungs….

37
Q

rigid tubings

A

high pressure but non moveable components

38
Q

flexible hose

A

medium pressures, deal with vibration/movement

39
Q

aluminum fittings

A

low/medium pressure application

40
Q

steel fittings

A

high pressure application

41
Q

what seals used for synthetic fluid

A

Butyl seals

42
Q

hydraulic filter purpose

A

remove particulate contamination
dirt is deadly :)

43
Q

if a hydraulic filter is clogged….

A

typically bypass valve allows fluid to bypass if clogged

44
Q

hydraulic reservoir purposes

A

primary: supply fluid to pumps and system components
secondary: thermal expansion, air purging, filtration and sediment, cooling

45
Q

non pressurized reservoir

A

vented to atmosphere to let air dissipate
smaller aircraft

46
Q

pressurized reservoir

A

higher altitude aircraft
minimizes foaming

47
Q

hydraulic accumulator

A

stores hydraulic fluid under pressure
back up or intermittent loads

48
Q

hydraulic pump

A

supplies fluid flow to actuating units
provides pressure to overcome system resistance

49
Q

engine driven pump

A

active when engine is running
transport aircraft
good for large / constant need systems

50
Q

electric pump

A

single use tasks
(landing gear)
lighter aircraft

51
Q

big aircraft / airline hydraulic preflight checks

A

again I need to find this elsewhere

52
Q

pressure relief valves

A

protect system from damage due to pressure build up

53
Q

check valve

A

permits flow in only one direction

54
Q

4 way selector valve

A

moves actuators in two directions

55
Q

3 way selector valve

A

used if flow is required to move in one direction

56
Q

2 way selector valve

A

controls flow on and off

57
Q

actuating device purpose

A

convert fluid flow to mechanical motion
linear or rotary

58
Q

trunnion

A

attaches landing gear assembly to airframe
pivots during extension and retraction

59
Q

shock strut

A

vertical member that contains air-oleo shock absorber

60
Q

truck / pivot fork and shaft

A

used when wheels are in tandem
tilts fore and aft with attitude

61
Q

torque arm

A

connects shock strut to truck
restricts extension of shock strut during gear retraction
holds wheel and axle in alignment with shock strut

62
Q

drag / side brace

A

stabilizes landing gear assembly

63
Q

shock strut

A

supports weight of aircraft
absorbs / displaces landing loads

64
Q

oleo strut

A

fluid acts to absorb shock of compression
slows strut collapse as fluid passes through

65
Q

energy returning strut

A

spring steel landing gear
returns energy back to aircraft

66
Q

aircraft wheel construction

A

split in 2 halves
halves held together by tie or through bolts
held on by single nut

67
Q

tube type tire

A

needs inner seal
not seen with aircraft

68
Q

tubeless type wheel

A

inflation valve into wheel half
o-ring seal between wheel halves

69
Q

what safety feature due tubeless wheels have

A

fuse plugs to blow out and release tire pressure in event of overheat/temperature melts threads

70
Q

important wheel preflight check

A

cotter pin retaining axle nut

71
Q

what data is on the wheel data plate

A

part number
TSO number (approved AC part)
size tire accepted
manufacturer
torque value for tie bolts

72
Q

brake purpose

A

employs hydraulic pressure
holds wheels locked for parking

73
Q

independent brake system

A

individual master cylinders connected to reservoir or self contained
semi-rigid / flexible fluid lines
wheel cylinders to apply brake action

74
Q

Integral power brake system

A

typically on transport aircraft
main system hydraulic pressure for braking

75
Q

drum and shoe brake

A

older
drum rotates
shoes stationary
H. pressure presses shoe against drum
not great at dissipating heat

76
Q

single disk brakes

A

small aircraft
better at dissipating heat than drum

77
Q

multiple disk brakes

A

larger aircraft, heavy duty
more surface area = better friction = better braking

78
Q

segmented rotor brakes

A

modern
better dissipating heat

79
Q

what happens if air gets into hydraulic system

A

air compresses and energy input does not get transmitted to wheels

80
Q

if air gets into hydraulic system -

A

can bleed the hydraulic system to get the air out
preventative maintenance

81
Q

Cleveland type brake

A

piston actuates pucks on either side of disk brake to fixed disk

82
Q

Goodyear type brake

A

disk is floating

83
Q

how does the master cylinder work

A

has flexible hoses that run to caliper and sends hydraulic fluid

84
Q

multiple disk issues

A

heat fires
heat build up prevents effective braking

85
Q

indicator pin

A

how much material has been used - shows wear on brakes

AT 202 (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions