GPS has limitations for aircraft navigation use because

It is not as robust as other systems

Which of the following statements is false?

The civilian NAVSTAR GPS codes were deliberately degraded until 1998.

The position error of an inertial navigation system will

increase with flight time as the error is cumulative

A federated architecture is one which;

uses differing hardware for individual functions.

Just prior to taking-off, on a very good soaring day, the pilot fills his sailplane wings with water in order to?

increase the aircraft weight so that it can fly faster through sinking air

The attitude indicator is

part of the primary flight display showing pitch and roll

Head up displays use collimating optics so that

the observer sees the symbology in focus

Which of the following forms of lift generation is the most conducive for a 500km sailplane flight (of triangular form)

Thermal currents from relatively warm ground sources.

Conventional airliners distribute electrical power at

115 volts 400 Hz 3 phase AC and 28 volts DC

The first manned aircraft to achieve sustained supersonic flight with a reheated turbojet engine was the:

North American F100 Super Sabre

Introducing redundancy into a system involves;

Building it with more parts than are needed to operate

Slats are positioned:

Along the leading edge of the wings.

Which of the following statements is false?

A “major effect” if the consequences included “serious injury to, or death

What are the standard distribution voltages on current civil airliners?

28VDC and 115VAC 3 phase 400Hz.

A single engine helicopter has a total power failure when hovering at 2000ft. Which should a pilot do to land safely?

Apply an autorotative main rotor blade pitch and descend at best glide angl

The term ‘glass cockpit’ describes

Display screens used in place of individual instrument gauges

The main operational difference between the most highly developed autogyro and the helicopter is that it ……

cannot hover for sustained periods

Which of these statements best defines ‘availability’ in an aerospace context?

the probability that a system/item is in a functioning state at a time

Generally, irrespective of flight profile, the sailplane pilot uses the rudder control more often than the pilot of a po

the ailerons of sailplanes can produce significant adverse yaw

Which of the following best describes a random failure?

The filament blowing in the ‘call attendant’ cabin light.

Autogyros and helicopters have a number of similarities but only one of the following statements is true. Which one i

Like helicopters, autogyros can have the ability to take off vertically

Which of the following statements is true?

The main drawback of inertial navigation systems is drift-cumulative errors

When architecting aircraft systems why would dissimilar redundancy be used?

To mitigate systematic failures

Aspect ratio can be defined as:

The square of the wing span divided by the wing reference area.

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AVDASI 1 Part 2

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Questions 76

Answers

1
GPS has limitations for aircraft navigation use because
It is not as robust as other systems
The US charges royalties on airlines using the system
It only covers certain parts of the globe
GPS receivers do not work well at altitude
2
Which of the following statements is false?
Using multiple frequencies can help mitigate atmospheric propagation errors
The nominal accuracy of NAVSTAR GPS is approximately 10m.
The civilian NAVSTAR GPS codes were deliberately degraded until 1998.
NAVSTAR GPS, GLONASS, Galileo and Compass are satellite navigation systems
3
The position error of an inertial navigation system will
reduce with flight time as more measurements average out the error
increase with flight time as the error is cumulative
stay the same as error is based only on initial calibration
periodically increase and decrease due to tiny variations in gravity
4
What engine powered the Concorde supersonic Airliner?
Pegasus
Olympus
Adour
Spey
5
The Boeing 707 was a derivative of which aircraft:
B52
KC135
VC10
B47
6
The first transatlantic fare paying service by a turbojet powered aircraft was in:
1969
1958
1963
1949
7
A federated architecture is one which;
combines functions onto a single processor
is being introduced on the latest aircraft
is designed by several different individuals for safety
uses differing hardware for individual functions.
8
The installed electrical generation capacity of the A380 is approximately
5,000,000 W
50,000 W
500,000 W
5,000 W
9
Modern fan blades are made from what metal?
Magnesium
Aluminium
Nickel based alloy
Titanium
10
Just prior to taking-off, on a very good soaring day, the pilot fills his sailplane wings with water in order to?
provide wing root bending-moment-relief when generating high levels of lift
increase the wing loading to give a smoother flight through turbulence
increase the aircraft weight so that it can fly faster through sinking air
increase the roll inertia for greater stability in thermals
11
The attitude indicator is
part of the ECAM display showing operational information
part of the navigation display showing heading
part of the primary flight display showing pitch and roll
part of the airline customer service questionnaire.
12
Head up displays use collimating optics so that
the symbology appears on top of the outside world view
the observer sees the symbology in focus
infrared wavelengths are seen as visible light
the size of the combiner is reduced
13
Which of the following forms of lift generation is the most conducive for a 500km sailplane flight (of triangular form)
None of the above.
Local updrafts due to wind rising over a ridge of hills.
Lenticular waves formed in the lee of a mountain range.
Thermal currents from relatively warm ground sources.
14
An elevator is used to control the aircraft in:
Roll, pitch and yaw.
Roll
Yaw.
Pitch.
15
Under air worthiness regulations an event that significantly increases crew workload and causes some injury is classed a
major
serious
minor
hazardous
16
From what part of the engine does the air needed to cool the high pressure turbine come from?
Combustion exhaust
Inlet to the compression system
The by-pass stream
Exit to the compression system
17
Conventional airliners distribute electrical power at
240 volts 400 Hz 1 phase AC and 28 volts DC
115 volts 50 Hz 3 phase AC and 12 volts DC
115 volts 400 Hz 3 phase AC and 28 volts DC
240 volts 50 Hz 3 phase AC and 12 volts DC
18
The first manned aircraft to achieve sustained supersonic flight with a reheated turbojet engine was the:
English Electric P1 Lightning
Bell X-1
North American F86 Sabre
North American F100 Super Sabre
19
Approximately how much electrical power is a typical civil airliner capable of generating?
enough to power 10 houses
enough to power a house
enough to power 100 houses
enough to boil a kettle
20
The ‘ray-dome’ of an aircraft can be found:
at the tail
at the nose
around the landing gear
in the wing box
21
Which of the following is an emergency source of electrical and hydraulic power?
Generators
APU
Batteries
RAT
22
Which of the following describes an effect of increasing RF frequency?
range increases
data rate increases
antenna size increases
all of the above
23
Introducing redundancy into a system involves;
Switching between parts to reduce wear and tear
Building it with more parts than are needed to operate
Reducing the workforce making the system components
Building it from obsolete components.
24
All four helicopter designs listed below have two rotors. Which design converts a less of the power to producing lift?
Contra-rotating coaxial
Tandem
Sychropter
Conventional (penny-farthing)
25
Slats are positioned:
At the wing tips.
Along the leading edge of the wings.
Along the trailing edge of the wings.
Along both the leading and trailing edges of the wings.
26
Which of the following statements is false?
A Redundancy can provide mitigation against random failures
A “major effect” if the consequences included “serious injury to, or death
A systemic failure will always occur for a given set of conditions.
Availability is the probability a given system is in a functioning state
27
What are the standard distribution voltages on current civil airliners?
28VAC and 115VDC 3 phase 50Hz.
24VAC and 220VDC 1 phase 400Hz
28VDC and 115VAC 3 phase 400Hz.
24VDC and 220VAC 1 phase 50Hz
28
Which of the following is not a valid 1553 data bus word
Status word
Program word
Data word
Command word
29
The maximum speed of a pure helicopter is limited. Which of the following is NOT a limiting factor?
Retreating blade stall
Advancing blade drag due to compressibility
Advancing blade drag combined with retreating blade stall
Installed engine power
30
A single engine helicopter has a total power failure when hovering at 2000ft. Which should a pilot do to land safely?
Apply an autorotative main rotor blade pitch and trim using the tail rotor
Apply an autorotative main rotor blade pitch and descend vertically
Deploy a ballistic parachute.
Apply an autorotative main rotor blade pitch and descend at best glide angl
31
The term ‘glass cockpit’ describes
The fragile nature of modern aircraft interiors
Display screens used in place of individual instrument gauges
Fibre optic cables replacing wired connections to instruments
Recent aircraft with larger windscreen area for better forward visibility
32
For what aircraft was the first high by-pass ratio engine designed?
Vickers VC10
Lockheed Tristar
Boeing 747 Jumbo
Lockheed C5A
33
What approximate temperature do the exhaust gases leave the combustion chamber of a modern gas turbine?
900K
1400K
500K
1900K
34
The main operational difference between the most highly developed autogyro and the helicopter is that it ……
cannot take-off or land vertically
cannot hover for sustained periods
none of the above statement is true
has a lower maximum flight speed
35
Which of the following require electrical power on a modern commercial aircraft?
Fuel pumps
Avionic systems
All of the above
Ventilation fans
36
Which of these statements best defines ‘availability’ in an aerospace context?
the inability of an item to perform its intended function
the probability that a system/item is in a functioning state at a time
freedom from those conditions that can cause death, injury...
the attribute of a system or an item indicating that it can be relied upon
37
If a sensor has a MTBF of 500,000 hours, what is the probability it will fail in a 10 hour flight?
2x10-6
2x10-5
5 x10-6
2 x10-7
38
Why do large aircraft have batteries in their electrical system?
To supply low voltage lamps
To start the engines
To supply the navigation systems only in case of power failure
To provide back-up power
39
Generally, irrespective of flight profile, the sailplane pilot uses the rudder control more often than the pilot of a po
sailplane roll inertia is generally higher than that of powered aircraft
the ailerons of sailplanes are not very efficient
the ailerons of sailplanes can produce significant adverse yaw
sailplanes have relatively poor directional stability
40
Who invented the autogyro?
Igor Sikorsky
Igor Bensen
Juan de la Cierva
Raoul Hafner
41
Which of the following best describes a random failure?
A ‘bug’ in navigation software.
An aircraft display overheating when parked in sunshine.
The filament blowing in the ‘call attendant’ cabin light.
An aircraft skidding off the runway in icy conditions
42
If a radio navigation aid operates at approximately 120MHz, which radio band does it occupy?
VHF
LF
HF
MF
43
The 3 main secondary control surfaces are the:
Elevators, Ailerons and Rudders
Flaps, Slats and Spoilers.
Flaperon, Taileron and Canard.
Ruddervator, Elevon and Flaperon
44
Autogyros and helicopters have a number of similarities but only one of the following statements is true. Which one i
Like helicopters, autogyros can have the ability to take off vertically
Like a helicopter, autogyros can fly forwards and backwards
An autogyro can hover like a helicopter
Unlike an autogyro, the rotors of a helicopter cannot autorotate
45
Which of the following is not a parameter in the Breguet Range Equation?
Specific Fuel Consumption.
Wing Span.
Flight Speed.
L/D Ratio
46
Which of the following statements is true?
The main drawback of inertial navigation systems is drift-cumulative errors
Gyroscopes measure the angular position of an aircraft.
Accelerometers provide an unambiguous measure of acceleration.
Inertial navigation systems are cheap.
47
Modern compressor blades are made from what metal?
Titanium
Magnesium
Nickel based alloy
Aluminium
48
When architecting aircraft systems why would dissimilar redundancy be used?
To make the system deterministic
To mitigate random failures
To make the system non-deterministic
To mitigate systematic failures
49
Aspect ratio can be defined as:
The wing reference area divided by the wing span.
The square of the wing span divided by the wing reference area.
The square of the wing reference area divided by the wing span.
The wing span divided by the wing reference area.
50
Which of the following is not being considered for use as an aviation biofuel feedstock?
Camelina.
Wheat
Jatropha.
Salicornia.
51
Which of the following is not an advantage of digital control electronics over analogue implementations
less likely to drift with time
more complex mathematical operations can be performed
lower power consumption
less susceptible to interference
52
Which one of these systems is the most important for safe flight of a passenger aircraft?
ground position warning system
radio navigation aids
air data
inertial navigation
53
What is the function of the ‘localiser’
to locate the aircraft if it has been lost
to re-tune the aircraft’s radio to traffic control at different airports
to keep the aircraft aligned with the runway on landing
to keep the aircraft on the correct descent when landing
54
Who was the first person to design and develop a successful gas turbine for aircraft propulsion in the UK?
Barnes Wallis
Reginald Mitchell.
Stanley Hooker
Frank Whittle
55
The most commonly used type of landing gear configuration is the:
Single main
Tricycle.
Bicycle.
Tail-dragger.
56
As part of the MEA initiative electrical systems are replacing hydraulic actuation, but which statement is not true?
Hydraulic systems are less reliable than electrical actuation systems
Hydraulic actuation systems have a higher power density than electrical
Hydraulic systems act quicker than electrical actuation systems
Hydraulic actuations systems are more costly to maintain than electrical
57
An embedded computer
Provides redundancy
is able to compile high-level languages with integrity
is made by one manufacturer
performs a particular task within a wider system
58
On what type of aircraft is the vertical position of the wing most likely to intersect with the middle of the fuselage?
Civil Passenger Aircraft
Military Transport Aircraft.
Fighter Aircraft.
This configuration is commonly used on all aircraft types
59
In an engine with a-pass ratio of 11, what percentage of the total flow “bypasses” the combustion chamber:
90%
60%
30%
10%
60
There is an upper limit to the mass of conventional helicopters with shaft driven rotors and this is due to the …
weight of the main gearbox resulting in a zero payload fraction.
impractical size of the anti-torque rotor.
weight of fuel required resulting in a zero payload fraction
total weight of the airframe and payload
61
Which pneumatic system cannot currently be replaced with an electrical equivalent?
none: all these pneumatic systems can be replaced
air conditioning
wing de-icing
engine start
62
‘CVG’ stands for
Controlled Voltage Generator
Constant Velocity Gearbox
Certified Valve Group
Concentric Variable Gear
63
When considering radio systems, as the carrier frequency wavelength increases:
Data rates decrease, antenna length increases, propagation distance increas
Data rates increase, antenna length decreases, propagation distance decreas
Data rates decrease, antenna length increase, propagation distance decreas
Data rates increase, antenna length decreases, propagation distance increas
64
The major driver for the introduction of high by-pass engines was:
Better fuel economy and lower noise
Lower noise
Better fuel economy
Improved maintenance
65
Helmet mounted display systems are more complex to implement than head up displays because
Data must be sent wirelessly to the helmet
The field of view if often restricted
The symbology must be brighter
The relative position of the helmet and cockpit must be known
66
VOR beacons offer improvements compared to the older ADF navigation system because;
The VOR system works on oceanic routes
The VOR system requires no moving parts
The VOR system operates via satellite link
The VOR infrastructure is much cheaper
67
The power of a civil airliner engine is approximately
10’s of GW
10’s of mW
10’s of kW
10’s of MW
68
Just prior to taking-off, on a very good soaring day, the pilot fills the sailplane’s wings with water in order to…
provide wing root bending-moment-relief when generating high levels of lift
increase the wing loading to give a smoother flight through turbulence.
up the aircraft weight so that it can fly faster in areas of sinking air
All the above apply.
69
Which statement is least accurate?
Hydraulic actuation systems have a high power/weight ratio.
Hydraulic actuation systems have constant operating pressure
Hydraulic actuation systems are easy to maintain
Hydraulic actuation systems can be made to fail safe
70
Which of the following statements is false?
Slats allow an aircraft to fly slower by increasing drag
Spoilerons may be used to roll an aircraft
Spoilers reduce lift.
Flaps increase the maximum lift coefficient.
71
‘Power factor’ describes;
The size of an AC system accurately
A new TV talent show for engineers
The phase displacement between current and voltage in an AC system
The apparent power of an DC system
72
There is an upper limit to the mass of conventional helicopters with shaft driven rotors and this is due to
the weight of fuel required in a zero payload fraction
the impractical size of the anti-torque rotor
the weight of the main gearbox resulting in a zero payload fraction
engine power-to-weight ratios
73
The main advantage of a blended wing body compared to a conventional aircraft design is that it:
Allows engines with a higher by-pass ratio to be installed.
Allows the wetted surface area to be reduced.
Is easier to manufacture.
Improves aircraft handling characteristics.
74
The first high by-pass ratio engine (GE TF39) powered which aircraft:
Lockheed 1011
Douglas DC10
Lockheed C5A
Boeing 747
75
Unassisted GPS has fundamental accuracy limitations caused by
The size of GPS receiver antennas
The orbit of the satellites coupled with the shape of the earth’s surface
The propagation of radio waves through the atmosphere
The maximum power capability of satellites
76
Which of the following is not a primary control surface?
Ruddervator
Aileron
Flaps
Canard

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