AEIS CHAPTER 7 Flashcards
engine instruments indicate i)
the operating parameters of an aircraft’s engine
operating parameters include
quantity, pressure, temperature and speed
Manifold pressure gauge is used to indicate i)
the absolute pressure of the fuel-air mixture inside the intake manifold
MAP refers to
manifold absolute pressure
engine power output is represented via the i)
manifold pressure gauge
as the throttle setting is increases, MAP i)
increases
when the engine is not running, the manifold pressure gauge indicates i)
ambient air pressure
engine failure or power loss is indicated on the manifold gauge as an i)
increase in manifold pressure value corresponding to ambient air pressure at the altitude of failure occurence
green arc in a manifold pressure gauge indicates
normality
red mark in a manifold pressure gauge indicates
manifold limit
manifold pressure reading is proportional to i)
engine power input
tachometers indicate the i) in a reciprocating engine
speed of the crankshaft
tachometers indicate the i) in a gas turbine engine
speed of compressor shaft
what are the two types of tachometers
mechanical and electrical
mechanical type tachometers include the i)-type and the ii) type
centrifugal type, magnetic drag-cup type
electrical type tachometers include the i)-type and the ii) type
DC-type, AC-type
why are AC-type tachometers preferred over DC-type tachometers
AC-type eliminates the use of brushes and commutators, thus it has a minimum error margin compared to the DC-type
thermocouples consist of i) wires of different ii)
2, metals
temperature is measured at the i) junction
hot
when the hot junction experiences a change in temperature, a i) is created at the cold junction
corresponding voltage
the corresponding voltage created at the cold junction can be used to indicate the i)
temperature
which thermocouples type has good thermal contact
surface contact type
which thermocouples type is used for the measurement of gases
immersion type
which thermocouples immersion types is deployed depending on the velocity of the engine exhaust gases
stagnation type and rapid response type
stagnation type thermocouples are used on i) engines
jet engines
rapid response type thermocouples are used on i) engines
turboprop engines
thermocouple cold junction is prone to temperature fluctuations and thus i)
compensation needs to be incorporated to offset inaccuracies
what are the two main methods of fuel quantity measurement
float-type and capacitance-type
capacitance type is the more preferred method because it is i)
highly accurate
fuel flow measurement system monitors the i)
fuel pressure at the injectors
the fuel pressure at the injector indicates the i)
fuel flow
why can the fuel pressure be used to indicate the fuel flow?
fuel flow is proportional to pressure drop across the fuel injectors
limitation to the use of fuel pressure as flow indicator is that if an injector is i), the pressure gauge will indicate ii)
clogged, a higher fuel pressure which means greater fuel flow
on large reciprocating engine aircraft, a i) type fuel flow meter is used
vane-type
AoA refers to
angle of attack
angle of attack (AoA) can also be referred to as
alpha angle
AoA is the angle between i) and the i)
angle between wing chord line and the direction of relative airflow
AoA determines the magnitude of i)
lift generated by a wing
Lift i) as AoA increases
increases
Critical AoA is also known as i)
stalling angle
stalling angle is typically between
12 to 18 degrees
