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PwrPlt K-App Fuel/Ign #4 Flashcards | StudBud
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PwrPlt K-App Fuel/Ign #4
PwrPlt K-App Fuel/Ign #4
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1
What happens to excess fuel not required by an engine in a constant displacement pump?
pressure relief valve bypasses excess fuel
cause a rich fuel mixture
shear shaft will shear and shut down pump
returns to the oil pump inlet
2
What is the main concern when preparing a magneto for installation?
oil level
engine hours
compression check
internal timing
3
What are 2 categories of turbine engine fuel pumps?
constant and variable pressure pumps
constant and variable displacement
reciprocating and linear pumps
variable pressure and constant displacement
4
What does the use of fuel boost pump help prevent?
prevent hung starts and low epr
increase gravity in the tanks
engine driven pump cavitation and vapor lock
fuel with hurt feelings resulting in low morale
5
What is the purpose of the dump portion of a pressurizing and dump valve?
drain the pump for maintenance
reduce fuel consumption according to epa standards
drain fuel from the manifolds upon shutdown
dump excess fuel in the event of over pressurization
6
Name 2 major components of a supervisory electronic engine control?
electronic monitor screen and pilot
hydraulic maintenance config computer and solar panel
hydromechanical control unit and electronic control unit
supervisors and subordinates
7
What are 2 sources used in turbine engine fuel systems for fuel heating?
exhaust air and electricity
heating element and compression heating
bleed air and engine lubrication oil
lower altitude and summer time flights
8
What are 3 events required to fire a spark plug in a cylinder when its piston is in the prescribed position
mag in egap, points opening, distributer pointing to correct cylinder
keys on dash, forms checked, fuel sumps drained
piston at bdc, crankshaft in balance, cylinder honed
mag grounded, plugs shorting internally, full register achieved
9
What are the maintenance adjustments normally allowed on hydromechanical fuel controls?
gravity forces acting on fuel and max inlet temp
specific gravity for fuel, idle rpm, max rpm or epr
sideways and lateral adjustments
thrust booster nozzle and inlet close down door
10
What is the function of a mixture control on float type carburetors?
control fuel pressure
control fuel/air mixture
control carb heat
control air/air mixture
11
Name 3 engine variables that may be detected by a turbine engine fuel control unit....
rpm, wind direction, icing
rpm, compressor inlet pressure, burner pressure
density of ambient pressure, temp of compressor exit
fuel level, cooling efficiency, temp effectiveness
12
What are typically the 3 main components of turbine engine ignition systems?
high tension leads
ignition exciters
igniters
all of the above
13
What type of fuel pump can vary the amount of fuel discharged regardless of speed?
variable density pump
variable displacement pump
constant displacement pump
constant temp pump
14
What operates an automatic mixture control?
sealed bellows contracting / expanding with temp/pressure changes
Ecu
Fadec controlled
economizer systems operating at high power setting preventing detonation
15
name two advantages of a fadec over hydromechanical fuel controls....
improved starts and fuel savings
all of the above
limit protection and modulate active clearance control
constant idle speed with changes in atmospheric conditions
16
A gear type pump is classified in what category?
variable speed
constant displacement
constant speed
variable displacement
17
That is the purpose of fuel boost pumps?
supply pressurized fuel to engine driven pump
supply pressure free fuel to the fuel control
supply heated fuel to engine to prevent freezing
boost the fuels feelings on the way to the heater
18
Name 3 engine variables that may be detected by a turbine engine fuel control unit....
compressor inlet temp
compressor discharge pressure
power lever angle
all the above
19
What is the purpose of the pressurizing portion of a pressurizing and dump valve?
provide pri/sec fuel flow to duplex nozzles
provide fuel to simplex fuel nozzles
20
Name 3 sources of high volume low pressure air for starting turbine engines...
canned air source, gun powder charge, ram air
cartridge, battery source, epu
on board apu, ground power unit, another running engine on aircraft
apu, thrust reverser, ram air
21
What are the 2 types of carburetors used on small reciprocating engines?
float/pressure carbs
good/bad carbs
electric/manual carbs
direct/indirect carbs
22
What is the action of a float type carburetor accelerating system when the throttle is opened with a quick action?
charge of fuel to enrich fuel/air mixture to prevent stumble
constriction of fuel flow
it goes up
extra air to enrichen mixture preventing surge
23
Which magneto is grounded when the magneto switch is selected to the right magneto?
right mag
neither mag
both mags
left mag
24
Where does a pressure injection carburetor obtain fuel pressure?
gravity fed fuel pump
from an in tank electric pump
from an engine driven fuel pump
hand pump
25
Why should engine rpm be accelerated periodically when making carburetor adjustments?
to heat up engine
to cool engine
to load up engine
to clear engine
26
Are turbine engine spark igniters generally susceptible to carbon fouling?
yes, 100 Low Lead is very volatile
yes, jet A burns dirty
no, cleaned after each flight
no, high energy spark cleans plugs
27
Between field and armature windings in starter generators, which receive current for operation in starter mode?
neither
armature
generally both
field
28
Remaining service life of brushes in starter/gen can be determined by visual inspection of .....
amount of wear groove remaining
grooves in armature
spring tension test
how many cranking amps required to start
29
What's the RPM indication when an idle mixture is set and the mix/control is placed to the idle cutoff position?
rpm decrease immediately
rpm increase rapidly
rpm slight rise then decrease in rpm
rpm decrease then increase to takeoff
30
When an ignition switch is off in a magneto system, what is the condition of the ground circuit?
12 volts removed from magneto
P lead is opening circuit
Circuit to ground is completed
spark plug leads receive 12 volts
31
What is the purpose of using two magnetos in an engine's ignition system?
system redundancy (safety) & combustion efficiency
one for each side of engine
balance aircraft weight
cause more unburnt fuel
32
What keeps a dual element constant displacement fuel pump operating if one gear element seizes?
boost pump will supply fuel
shear section of drive shaft
if doesn't the engine quits
back up pump will kick in
33
What does a magneto timing light indicate?
instant points open
18 degrees
22 degrees
instant points close
34
Name 2 parts of a starter/generator that commonly require periodic inspection to ensure not wearing beyond limits?
wear indicators and oil level
housing and magnets
brushes and armature
commutator and brushes
35
What is the function of turbine engine fuel control units?
manually satisfy fuel requirements of the engine
automatically satisfy fuel requirements of the engine
36
Name at least 3 advantages of direct fuel injection systems....
all of the above
reduced overheating of cylinders
less icing, improved acceleration and distribution
improved fuel distribution better fuel economy
37
What turbine engine components inject fuel into the combustion area?
atomic particle accelerator
compressor inlet spray manifold
fuel spray nozzles
sprinkler systems
38
name two advantages of a fadec over hydromechanical fuel controls....
sporatic starts and consistent high exhaust temps
all of the above
no trimming required and repeatable engine transients
constant trimming and unreliable transient settings
39
What type of engine driven fuel pump is widely used other than gear and piston pumps?
rotary vane pump
linear vane pump
rotor blade stationary
nuclear reactive pump
40
What position of a pressure injection carburetor manual mixture control would stop engine operation?
100 percent/takeoff
0 percent/idle
75 percent position
55 percent mid range
41
What are the 2 basic types of turbine engine fuel controls units?
direct and static
Hydromechanical and Electronic
EEC and Fadec
dynamic and semi dynamic
42
When does a carburetor economizer system needle valve begin to open?
below 60-70 percent of rated power
above 60-70 percent of rated power
at idle setting
at take off power setting
43
What is another type of fuel metering system used on recip engines other than carburetors?
direct fuel injection
indirection fuel injection
44
Depending on the particular engine, trimming is c/w according to 1 of 2 types of engine indication, what are they?
amb pressure and temp
elt and altimeter
temp and cooling
epr and rpm
45
What is a commonly used type of fuel boost pump?
piston pump
rotary vane
centrifugal type
gear type
46
What is the function of a duty cycle in relation to a turbine engine ignition system?
amount of time in standby mode
inflight/ground operation
allows time in operation and cool down period after use
establish max temp range
47
What is the purpose of a turbine engine driven fuel pump?
cool the fuel and heat the oil
pump the fuel from the tank to the engine
deliver continuous supply of fuel at proper pressure
48
What is the purpose of a carburetor economizer system?
add fuel at high power setting to cool and prevent detonation
add fuel to increase power due to detonation
increase fuel efficiency and prevent fuel consumption
reduce fuel to prevent detonation
49
Which magneto is grounded when the magneto switch is selected to the right magneto?
aft mag
right mag
left mag
center mag
50
In a recip engine, what problem is caused by an excessively rich mixture at idle?
excessive heating of plug
excessive cleaning of spark plug
fouling of the spark plug
reduced cooling of spark plug
