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Sample Module 5 Digital Techniques Practice Questions
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1In an Electronic Flight Instrument System (EFIS), what is the primary function of the Symbol Generator (SG) or Display Electronic Unit (DEU)?
A.To convert analog and digital sensor inputs into deflection and video signals for display on the CRTs or LCDs
B.To store flight plan waypoints and calculate lateral navigation guidance vectors
C.To directly supply 115V AC 400Hz power to the cockpit instrument backlighting circuits
D.To sense aircraft attitude using internal ring laser gyroscopes and accelerometers
Explanation: The Symbol Generator (SG) or Display Electronic Unit (DEU) receives raw data from aircraft sensors and avionics computers via data buses (such as ARINC 429) or analog inputs, processes the data, and generates the graphic display symbology (deflection, raster, or digital video drive signals) rendered on the PFD and ND screens.
2Which display technology uses a matrix of Thin Film Transistors (TFT) at each subpixel to maintain charge and prevent flicker?
A.Active Matrix Liquid Crystal Display (AMLCD)
B.Passive Matrix Liquid Crystal Display (PMLCD)
C.Shadow Mask Cathode Ray Tube (CRT)
D.Light Emitting Diode Segmented Display (Segmented LED)
Explanation: Active Matrix LCDs (AMLCDs) utilize a matrix of Thin Film Transistors (TFTs) integrated into the glass substrate. Each subpixel has its own transistor acting as a switch to maintain the liquid crystal orientation and voltage charge until the next refresh frame, providing superior brightness, high contrast, wide viewing angle, and zero flicker required for modern cockpit displays.
3On an ECAM (Electronic Centralized Aircraft Monitor) system, what information is permanently displayed on the Left Display (Engine/Warning Display - EWD)?
A.Primary engine parameters (N1/EPR, EGT, N2), flap/slat position, and crew alert warning/caution messages
B.System synoptic diagrams showing hydraulic pressures and electrical bus tie status
C.Inertial reference alignment status and ground speed vector displays
D.Flight Management System (FMS) route legs and weather radar returns
Explanation: The Airbus ECAM Engine/Warning Display (EWD, upper/left display) continuously shows critical primary engine indications (N1 or EPR, EGT, N2/N3), slat and flap position indicators, gross weight, and the Memo/Warning/Caution text area for crew alerting.
4In a Boeing EICAS (Engine Indicating and Crew Alerting System), what color represents a 'WARNING' level alert that requires immediate crew awareness and action?
A.Red
B.Amber
C.Cyan
D.Green
Explanation: In accordance with standard avionics color coding (AMC 25.1322 / CS-25), RED is strictly reserved for Warning messages indicating an emergency condition requiring immediate crew awareness and immediate corrective action. Amber represents Caution (immediate awareness, subsequent action), Cyan/White represents Status/Memo, and Green represents normal/safe operation.
5What is the primary optical component of a Head-Up Display (HUD) that combines the collimated symbolic image with the real-world view outside the cockpit?
A.Combiner Glass
B.Diffraction Grating Wheel
C.Prismatic Beam Splitter Cube
D.Shadow Mask Mesh
Explanation: The Combiner glass (or combiner optic) is a semi-reflective, highly transparent optical element mounted in the pilot's forward field of view. It reflects the projected, collimated symbology from the HUD Overhead Unit into the pilot's eyes while transmitting ambient light from the outside visual scene, allowing simultaneous viewing of flight symbology and external environment.
6What optical feature of a Head-Up Display (HUD) ensures that the projected symbology appears focused at infinity?
A.Collimating optics
B.Polarizing filters
C.Raster stroke attenuators
D.Field effect prisms
Explanation: Collimating optics (lens array or curved combiner glass) refract or reflect light rays emitted from the display source so that they emerge as parallel rays. This focuses the flight symbology optical image at infinity, enabling the pilot to view display symbols and real-world distant targets simultaneously without re-accommodating their eyes.
7If a Symbol Generator (SG 1) driving the Pilot's Primary Flight Display fails in flight, what manual action allows the pilot to restore the display?
A.Selecting the Display Transfer / EFIS Switching switch to ALTN (or SG 3 / SG 2)
B.Pulling and resetting the 115V AC Instrument Transformer circuit breaker
C.Re-booting the Flight Management Computer via the MCDU MENU key
D.Recycling the Master Ground Power switch on the overhead panel
Explanation: EFIS architectures include standby or auxiliary Symbol Generators (e.g., SG 3 / AUX SG). If SG 1 fails, selecting the EFIS Display Switching / Reconfiguration switch on the switching panel routes the output of the operative standby Symbol Generator to the pilot's PFD/ND screens.
8In CRT display technology, what is the purpose of the 'stroke' (vector) writing method compared to the 'raster' scanning method?
A.Stroke writing directly draws high-resolution, sharp lines and symbols for flight symbology, while raster scanning writes background shaded areas like weather radar
B.Stroke writing scans line-by-line from top to bottom like a television receiver, while raster draws dots
C.Stroke writing is used exclusively for color displays, while raster is strictly monochrome
D.Stroke writing uses low-voltage DC signals, while raster scanning uses high-frequency AC RF signals
Explanation: Modern hybrid CRT instrument displays combine stroke (calligraphic) and raster writing. Stroke writing directly traces out line vectors to create crisp, high-brightness flight symbology (pitch ladder, horizon line, airspeed tape), while raster scanning sweeps the beam horizontally in lines to build up shaded background images (such as weather radar or terrain maps).
9Which safety hazard is present when servicing Cathode Ray Tube (CRT) display units even after power has been removed?
A.High residual capacitive DC voltage on the CRT anode glass bulb
B.Radioactive gamma radiation emitted by the phosphor coating
C.Pressurized explosive gas inside the glass envelope
D.Corrosive acid leakage from internal electrolyte reservoirs
Explanation: CRTs act as large high-voltage capacitors (formed by the inner and outer conductive Aquadag coatings separated by glass). The extra-high tension (EHT) anode voltage (typically 12 kV to 25 kV) can retain a lethal capacitive charge long after power is disconnected. Technicians must discharge the CRT anode to chassis ground using an insulated grounding probe before handling.
10What is the primary function of a Primary Flight Display (PFD) in a modern integrated glass cockpit?
A.To consolidate attitude, airspeed, altitude, vertical speed, heading, and flight mode annunciations onto a single screen
B.To present schematic diagrams of fuel management, electrical generation, and hydraulic pressures
C.To display flight crew maintenance logs, fault codes, and BITE test menus
D.To project air traffic collision avoidance vectors and terrain mapping only
Explanation: The Primary Flight Display (PFD) replaces traditional T-arrangement mechanical flight instruments (ADI, HSI, altimeter, ASI, VSI) by consolidating primary flight parameter indications—attitude, IAS, barometric altitude, vertical speed, heading, and Flight Mode Annunciator (FMA) statuses—into a comprehensive central display.
About the Module 5 Digital Techniques Exam
UK CAA Part-66 Module 5 covers electronic instrument displays, digital logic, aircraft data buses (ARINC 429/629), microprocessors, and ESD handling for AME candidates. Exam includes 40 MCQs with a 75% pass mark.
Exam sponsor: UK Civil Aviation Authority (CAA). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.
Questions
40 questions
Time Limit
50 minutes
Passing Score
75%
Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.
Official sources
Our practice resources: topics covered
We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.
50%
Core Knowledge & Regulations
Fundamental principles, laws, and operating requirements.
50%
Applied Systems & Calculations
Practical application, calculations, and maintenance procedures.
Preparing for the Module 5 Digital Techniques Exam
What You Need to Know
- Passing score: 75%
- Exam length: 40 questions
- Time limit: 50 minutes
- Exam / certification fees: £75 Official sources
Using Our Practice Resources
- Work through all 100 available questions
- Review every answer and explanation
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Module 5 Digital Techniques: Suggested Study Strategy
1Review official CAA syllabus and learning objectives.
2Practise worked calculations and formula applications.
Frequently Asked Questions
What is the pass mark for Module 5 Digital Techniques?
The pass mark required by the UK CAA is 75%.