42 Questions
How are the prohibited areas ordered with increasing rpm ?
Rich Blow Out – Stall – Overtemp
What is used in a heat exchanger to heat the fuel ?
oil
The ... in a fuel metering system ensures that the pressure does not rise too far when the shut-off valve closes.
pressure relief valve
The cooling of the (1) ... of the (2) ... of the turbine is NOT controlled by FADEC ?
(1) blades; (2) HDT
What signal does FADEC use to keep the rpm on Flight Idle, so that a restart is possible?
Approach Configuration
Which one(s) of Newtons Laws do we need to explain propulsion of an aircraft ?
both the 2nd and the 3rd
During a cycle of a reciprocating engine a piston makes 4 strokes: 2 times up and 2 times down. During how many of these strokes is the piston driving the shaft ? (And NOT the shaft driving the piston.)
1
In an ideal gas molecules:
have zero volume
In a reciprocating engine the gas is compressed during an ... process.
adiabatic
In the inlet of a turbofan the temperature of the airflow (1) ... and the total temperature (2) ....
(1) increases; (2) stays the same
The largest fuel / air ratio is needed in a combustion chamber with a (1) ... inlettemperature and a (2) ... temperature increase:
(1) high; (2) high
If the TAS increases the specific thrust will:
drop, because less fuel can be supplied to 1 kg of air
What parameter is used as an indication for the thrust?
EPR
In a rotor there is a change of total temperature. This is because of the ... of a rotor.
rotation
We talk about surge when ... occurs.
a reversal of the axial direction of the airflow
In the stator of a 50%-reaction turbine (1) ... is converted to (2) ...
(1) pressure; (2) velocity
Due to the torque (caused by the centrifugal force) on a turbine blade a compressive stress occurs at:
both the leading- and the trailing edge
A surplus of air is fed to the combustion chamber. What is NOT a function of this surplus of air?
To ensure complete combustion of the fuel in the primary zone
What type of combustion chamber is the LEAST suitable for connection to a centrifugal compressor ?
Annular
I The starting engine of a twin-spool turbofan is connected to the N2-shaft II The starting engine drives the gas turbine by delivering air under pressure to the gas turbine
I is right, II is wrong
At what point does does light-up (the actual burning of the fuel) start ?
c
One of the prohibited areas in the fuel metering graph is labeled as 'Stall Area'. In this area the fuel-air ratio increases too much. The result of this is that the:
air expands too much
The heat exchanger in a fuel system (1) ... oil and (2) ... fuel.
(2) cools; (2) heats
See Appendix I. If the CDP increases the piston slides to the (1) ... and the fuel flow (2) ...
(1) left; (2) increases
Which component disappears when going from MEC to FADEC? The:
fly weights
During a cycle of a reciprocating engine a piston makes 4 strokes: 2 times up and 2 times down. During how many of these strokes is the SHAFT driving the PISTON ? (And NOT the piston driving the shaft.)
3
In a cylinder we have a gas under a free movable piston. On the piston is a mass of 5 kg. At some point I remove the mass off the piston so that the piston moves up VERY slowly. Now:
The temperature of the gas remains constant
In …-engine ignition does NOT take place.
A Stirling
The main advantages of a jet engine over a reciprocating engine are related to the:
airflow
The total enthalpy of 1 kg of air increases. What increases also for sure ?
Total temperature
The specific thrust is the amount of Newton … .
per kg air per second
. In the rotor of a compressor I. the relative velocity of the air increases II. the direction of the whirl velocity is reversed
I is wrong, II is wrong
At what point of the compressor characteristic the compressor is stalling ?
a
To determine the pressure difference you use the change of the (1) ... velocity in the diffuser, and the change of the (2) ... velocity in the impeller.
(1) absolute; (2) relative
In what area of the relight envelope is a restart only possible when using the starting engine?
Area B
To the combustion chamber much more air is fed than needed for stoichiometric combustion. What is NOT a function of this surplus of air?
Complete combustion of the fuel in the primary zone
What is the last parameter to increase at the startup of the engine?
EGT
Along what line(s) can the engine accelerate from X to Y ? Line C represents the equilibrium line.
only A and B
With increasing OAT N2 … (1) because the turbine ... (2) at a higher temperature.
(1) increases; (2) chokes
What component causes the fuelflow being only dependent on the size of the opening below the piston, and not on the pressure difference over the piston?
Component B
What signal is not used by a MEC?
N1
N1
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