記憶度
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問題一覧
1
How acceleration is calculated? (1.8)
a = V / T
2
What are different types of the gas turbine engines installed in aircraft? (1.12)
turbojet, turboprop, turbofan
3
Potential energy is (1.2)
defined as energy at rest
4
What is the bypass ratio of modern turbofan engines? (1.11)
around 5:1
5
To calculate work the following formula is used? (1.6)
W = F • d
6
EEC controls engine thrust in two modes. Which one is usually primarily? (1.20)
EPR mode
7
Fuel can be heated by (1.23)
oil and air coolers (by the air from bleed system)
8
EEC (1.20)
is naturally cooled by convention and additionally on some aircraft by blower
9
Velocity is defined by (1.7)
speed and direction
10
The relation between the thrust, air temperature and air pressure is? (1.4)
thrust decreases with air temperature increase and increase with air pressure increase
11
Turbo Jet engines (1.9)
accelerate small amount of air on very high acceleration rate
12
Kinetic energy is (1.2)
defined as energy of motion
13
Which Newton's law is basis for thrust formula T=m•a (1.3)
Second Newton's law
14
Total pressure is (1.4)
static plus dynamic pressure
15
Jet propulsion is practically application of Newton's third law of motion states that (1.3)
For every force acting on a body, there is an opposite and equal reaction
16
When EEC is replaced on an engine the EEC programing plug (1.19)
stays on the engine
17
A Engine Electronic Control (EEC) receives all the necessary data for engine operation and (1.14)
gives the information to Fuel Metering Unit (FMU) to meter proper amount of fuel to fuel nozzles
18
What kind of engine displays in the cockpit do we have? (2.3)
Analog, numerical and mixed displays
19
Which of the following in NOT a primary engine instrument? (2.7)
airspeed indicator
20
When EPR is not used as primary information about engine thrust the (2.10)
N1 información is used
21
E.G.T thermocouples are usually made of (2.16)
chromel and alumel
22
What unit takes care of vibrations on the engine? (2.12)
Engine Vibration Monitoring Unit (EVMU)
23
N2 indication is expressed in (2.5)
% of nominal RPM
24
Tachometer generator (2.14)
provides DC or AC voltage based on rotation speed
25
What is used on a turboprop used as a measure of power output? (2.13)
Torque -meter
26
EGT data is one of (2.7)
temperature data
27
Engine pressure ratio (EPR) in engine power terms is (2.4)
the ratio between inlet pressure and outlet pressure
28
N2 indicator shows the rotation speed of (2.4)
High pressure spool in %
29
On modern aircraft the vibration sensors are usually of (2.16)
piezoelectric type
30
N1 and N2 data belong to (2.7)
mechanical movement data
31
By resetting MASTER WARNING light (2.15)
specific system alert is reset to and goes out of view
32
On modern turbofan engines, the vibration picks-ups are located (2.12)
on both fan and turbine cases
33
A nacelle temperature indication (2.6)
show temperature of air inside the engine cowls
34
A green operational zone correspond? (2.15)
an engine normal operation zone
35
Engine pressure radio is determined by (2.4) DUDA
Dividing turbine out
36
Is EGT measured in the combustion chamber - before first hp stage? (2.8)
no
37
Is engine fuel temperature (measured behind the oil/fuel heat exchanger) usually displayed in the cockpit? (2.10)
no, but information is accessible via specific maintenance pages
38
Which of the following fire detection systems measures temperature rise compared to a reference temperature? (2.8)
thermocouple
39
Fuel filter clogging pre-alert happens (2.8)
when fuel filter is partially clogged
40
During automatic engine start (3.2)
ignition is on before fuel is applied
41
The benefit of electrical starter /generator is (3.4)
that acts are starter during start and when desengaged as generator
42
How many ignition plug are installed in the engine? (3.11)
2
43
When removing ignition plug (3.14)
remove ignition lead from ignition plug first
44
The fan on a turbofan engine is turned by (1.13)
the turbine section
45
Low oil pressure alert is triggered by (2.6)
Low oil pressure switch
46
Where EGT is usually measured? (2.8)
Between HP and LP turbine stages or most commonly LP turbine outlet
47
What vibrations are displayed in the cockpit? (2.12)
N1 and N2 spool vibrations
48
Which engine instrument actually shows the thrust of the engine? (2.3)
EPR indicator
49
The diffuser section is located between (1.11)
The compressor section and the burner section
50
While engine is running the ECC is normally powered by (1.20)
Permanent magnet alternator (PMA)
51
Air turbine starter is (3.6)
Much lighter than electrical starter
52
What can be the source for running air turbine starter? (3.6)
Ground start supply unit. APU and cross feed from running engine
53
Electric starting system is usually used on (3.3)
APUs and small turboshaft engines
54
In a thermocouple system, the voltage that is a result (2.5)
the hot junction only
55
During automatic engine start (3.2)
Fuel is applied before the ignition is on
56
Oil system indications consist of (2.6)
Oil quantity, pressure and temperature
57
Torque measurement in a gas turbine engine is (2.13)
Highly reliable
58
How turbine air starter is lubricated? (3.7)
It needs no oil since it has air bearings
59
A red operational zone corresponds to (2.15)
To danger zone require immediate action
60
A yellow operational zone corresponds to (2.15)
The zone where caution and careful monitoring is required
61
N1 indicator shows the rotation of (2.4)
Low pressure spool
62
Why do we need to heat the fuel above 32°F? (1.23)
To prevent ice formation on the fuel system filters
63
Fuel system last chance fitters are installed (1.17)
Before fuel nozzles
64
Formula for torque is (1.6)
T=Fd
65
What is the purpose of the diffuser section in a turbine engine? (1.11)
To increase pressure and reduce velocity
66
Engine pressure ratio is determined by (1.20)
Dividing turbine outlet total pressure by engine inlet total pressure