Practice Questions Flashcards
what does the cold section of an engine refer to?
the parts of the engine from the inlets up through the compressor and/or diffuser
approximately how much thrust is produced by the ‘Fan’ of a turbofan engine
80%
which of the following statements best describes the advantage, to an engine operator, of “modular engine construction”?
most modules can be replaced while the engine remains on the aircraft.
How must fuel be delivered to the engine?
they must deliver the correct fuel quantity to the combustion chambers at the right condition for satisfactory combustion
a FADEC’s electronic engine control (EEC) unit can control engine thrust in two modes. in the ‘alternate’ mode, the engine thrust is set by what?
The rotational speed, N1.
with regards to the fuel nozzles during an engine start, which nozzle does the flow divider direct all flow through?
primary nozzles only
On a twin spool turbofan, an “N2” indication relates to the speed of what
the high pressure rotor
How might an engine failure or power loss be indicated on the manifold gauge?
An increase in manifold pressure to a value corresponding to the ambient air pressure at the altitude where the failure occurred
Turbine engine gas temperature indicator thermocouples are located so that all temperature readings are relative to what?
The first stage turbine
What is the purpose of a propeller tachometer
On a fixed pitch propeller to give the pilot an indication of engine power and RPM
What is the purpose of a manifold pressure gauge?
Used to measure the pressure inside the induction system of an engine between the throttle and the engine cylinder combustion chamber
what type of electrical starter is used on a gas turbine engine?
direct current (DC) electric motor
prior to working on or around a reciprocating engine, what action should take place?
ignition switch should be off, fuel switches off and a warning sign placed on the ignition switch
the type of magneto starting device that employs the magneto’s own primary and secondary windings is?
an induction vibrator
what is the recommended time to wait following engine shutdown before working on the ignition system?
20 mins
if the earthing switch lead became detached from the magneto while the engine were running the:
the engine could not be stopped
what is the most common type of turbine starter used for engine starting?
Electric or air turbine start
APU’S are generally on what type of engine?
Turboshaft
a hydro/mechanical fuel control units “P3” pressure refers to what?
the engine compressor discharge pressure
what are the advantages of modular engine construction
there is more flexibility when changes are made to individual engine parts
what is the hot section of an engine refer too
the area past the compressors from the combustion chambers through to the exhaust
two statements regards the EEC calculations and channels
each channel is an independent computer,
the processor does all the calculations
what happens when there is a low oil pressure warning?
there is an accoustic warning in the flight deck
how is the EEC cooled?
convection
what pressure does an engine pressure EPR indicator or gauge compare to give a reading
engine turbine discharge pressure and inlet ram pressure
the temperature is an engine operating limit and is used to monitor the mechanical integrity of what?
the Turbines
what is the purpose of the turbine inside a “motorless mass flow” pressure transmitter
to drive the drum impeller
what happens top the manifold air pressure (MAP) as throttle angle is increased?
MAP increases
what indication is displayed if the N1 or N2 speed signal fails
BB broadband vibration
within a typical electrical torque meter, the phase signal is provided to the comparator by a pick-up located on which of the following
the output shaft
when is a magneto drop test carried out?
after maintenance on the ignition system and before every flight
two method of providing mechanical propellor speed tacho generation
magnetic drag cup and fly-weight
what is the most likely cause of accidental discharge from the igniter?
touch
how many engineers do you need to open the air starter valve if it fails
two engineers one in the flight deck and one at the engine opening the valve
what are the two types of electrical starting system used on a gas turbine engine aircraft
direct cranking electrical or starter generator systems
what are the three main components of a typical air turbine starter?
the air turbine starter consists of an axial flow turbine, a reduction gear train and starter clutch mechanism
impulse starters on magnetos operate on the principle of?
a spiral spring rotating the magneto
