100+ Free CPL Aircraft General Knowledge Practice Questions

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Sample CPL Aircraft General Knowledge Practice Questions

Try these sample questions to test your CPL Aircraft General Knowledge exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the primary function of an accumulator in an aircraft hydraulic system?

A.To regulate the overall system pressure

B.To store hydraulic fluid under pressure to assist the pumps during peak loads

C.To filter out microscopic contaminants from the fluid return line

D.To measure the fluid quantity in the main reservoir

Explanation: A hydraulic accumulator stores energy in the form of pressurized fluid, typically using compressed nitrogen gas separated from the fluid by a piston or diaphragm. It assists the hydraulic pump during periods of high demand, absorbs pressure surges, and provides a limited emergency source of pressure if the pump fails.

2How is the cabin altitude of a pressurized commercial aircraft controlled during cruise flight?

A.By adjusting the rotational speed of the engine-driven cabin superchargers

B.By regulating the amount of air venting out of the cabin through the outflow valve

C.By continuously cycling the air cycle machine on and off

D.By varying the thrust lever position to change engine bleed air pressure

Explanation: Pressurization is maintained by delivering a continuous flow of bleed air into the cabin and regulating its release through the cabin outflow valve. The cabin pressure controller automatically adjusts the outflow valve's opening to maintain the desired cabin altitude and pressure differential.

3What is the primary function of the torque links (scissors) on a nose gear shock strut?

A.To absorb lateral landing shocks and prevent strut bending

B.To prevent the piston from rotating relative to the cylinder while allowing vertical movement

C.To lock the nose gear in the down position

D.To transition steering control from the rudder pedals to the nose wheel

Explanation: Torque links connect the upper (cylinder) and lower (piston/piston tube) parts of the shock strut. They keep the wheel aligned parallel to the aircraft longitudinal axis and transmit steering forces while allowing the shock absorber to move vertically.

4Which of the following describes the operating principle of a bootstrap air cycle machine (ACM) used in cabin conditioning?

A.Compressing air using an electrical pump and routing it through a cooling radiator

B.Using a chemical absorbent to extract heat and moisture from the cabin inlet air

C.Bleeding engine air through a heat exchanger, compressing it, cooling it, and expanding it through a turbine to extract energy

D.Passing high-pressure bleed air over a liquid nitrogen cooling coil

Explanation: A bootstrap air cycle system works by taking engine bleed air, cooling it in a primary heat exchanger, compressing it in a centrifugal compressor, cooling it again in a secondary heat exchanger, and finally expanding it through a turbine. The expansion through the turbine extracts thermodynamic energy to drive the compressor, resulting in a large temperature drop.

5During the operation of a pneumatic de-ice boot system, what is the purpose of the vacuum system?

A.To inflate the boots rapidly when ice is detected

B.To hold the boots flat against the wing leading edge when the system is not in use

C.To draw cold outside air into the wing structures for cooling

D.To vacuum loose ice off the wing surface after it is shattered

Explanation: When pneumatic de-ice boots are not cycling, a vacuum is applied to them. This ensures they are held flush against the leading edge of the wing to prevent them from inflating due to low aerodynamic pressure, which would disrupt airflow and increase drag.

6In aircraft design, what is the primary difference between fail-safe and safe-life structural philosophies?

A.Fail-safe structures require no regular maintenance, while safe-life structures require daily inspections

B.Fail-safe design utilizes redundant load paths so that failure of one member does not cause structural collapse, whereas safe-life design assumes a component will not fail during its specified service life

C.Fail-safe components are made of composite materials, whereas safe-life components are made of aluminum

D.Fail-safe refers to emergency systems, while safe-life refers to passenger seats and cabin interior fittings

Explanation: A fail-safe structure is designed so that if a single structural element fails, other members can temporarily carry the load until the failure is discovered during inspection. In contrast, a safe-life component is designed to have a calculated fatigue life during which the probability of catastrophic failure is virtually zero, and it must be replaced before this limit is reached.

7What primary type of mechanical stress is a structural rivet designed to resist?

A.Tension

B.Torsion

C.Shear

D.Compression

Explanation: Rivets are primary fasteners used to hold overlapping skin panels or structural members together. They are designed to resist shear stress, which is the force acting parallel to the cross-section of the rivet shank tending to slide the sheets apart.

8What is the function of the cabin differential pressure maximum relief valve?

A.To prevent cabin pressure from falling below sea-level equivalent

B.To automatically dump all cabin pressure in the event of an engine fire

C.To prevent structural damage by venting air if cabin internal pressure exceeds atmospheric pressure by more than a designed limit

D.To ensure air flows only from the cabin to the cargo compartment

Explanation: The maximum differential pressure relief valve is a safety device that automatically opens to vent cabin air to the outside if the difference between internal cabin pressure and external atmospheric pressure exceeds the structural design limit of the fuselage.

9Which of the following describes the purpose of an aerodynamic balance panel on a control surface?

A.To lock the control surface in position when the aircraft is parked

B.To reduce the physical force required by the pilot to move the control surface by utilizing aerodynamic pressure

C.To increase the effectiveness of the control surface at very low airspeeds

D.To balance the weight of the control surface to prevent flutter

Explanation: An aerodynamic balance panel is a dynamic panel linked to the control surface inside a sealed chamber. When the control surface is deflected, pressure differences are created within the chamber that act on the panel, assisting the pilot or actuator in moving the control surface.

10How do differential ailerons minimize adverse yaw?

A.By deflecting the upward-moving aileron more than the downward-moving aileron

B.By locking the rudder in place during shallow turns

C.By deploying spoilers on both wings simultaneously when the ailerons are moved

D.By deflecting only the upward-moving aileron and keeping the opposite one neutral

Explanation: Differential ailerons are designed so that the upward-moving aileron deflects through a larger angle than the downward-moving one. This creates more profile drag on the wing moving down (inside of the turn) to balance the induced drag created by the increased lift on the wing moving up (outside of the turn), reducing adverse yaw.

About the CPL Aircraft General Knowledge Exam

The Civil Aviation Authority of Sri Lanka (CAASL) Commercial Pilot License (CPL) Aircraft General Knowledge examination is a comprehensive test based on EASA Part-FCL learning objectives. This examination evaluates a candidate's mastery of the physical components and systems that make up modern aircraft, ensuring they possess the theoretical understanding required to operate commercial aircraft safely and efficiently. The syllabus spans four main areas: Airframe and Systems (including structures, landing gear, hydraulics, and pneumatics), Electrics (AC/DC systems, generators, and distribution), Powerplant (piston and turbine engines, lubrication, and propellers), and Instrumentation (air data systems, gyroscopes, and flight management systems). The examination is administered as a computer-based test at the CAASL Examination Center in Katunayake. The actual exam consists of 80 multiple-choice questions with a total time limit of 3 hours and 15 minutes. A passing score of 75% is required. Aspiring commercial pilots must demonstrate a high degree of technical competence, as many questions involve analyzing system failures, interpreting instrument indications, and understanding the physical principles behind engine and system operations. Effective preparation requires studying system schematics, understanding the interaction between different aircraft components, and practicing EASA-aligned practice questions. Candidates should focus on the details of electrical bus distribution, hydraulic system redundancy, turbine engine start cycles, and the operating principles of gyroscopic instruments. Regular practice with high-quality mock exams helps build the speed and analytical skills necessary to pass the exam on the first attempt.

Questions

80 scored questions

Time Limit

3 hours and 15 minutes

Passing Score

75%

Exam Fee

LKR 2,000 (Civil Aviation Authority of Sri Lanka (CAASL) Examination Center)

CPL Aircraft General Knowledge Exam Content Outline

25%

Airframe, Systems, and Emergency Equipment

Fuselage, wings, landing gear, hydraulic and pneumatic systems, cabin air conditioning and pressurization, ice protection, and emergency equipment.

25%

Aircraft Electrics

Direct current (DC) and alternating current (AC) generation and distribution, battery systems, circuit protection, electrical motors, and system monitoring.

25%

Powerplants

Piston engines, turbine engines (turbofan, turboprop, turbojet), fuel systems, lubrication, cooling, ignition, and propeller systems.

25%

Flight Instrumentation

Air data instruments, gyroscopic instruments, magnetometers and compasses, engine performance instruments, and flight management and automatic control systems.

How to Pass the CPL Aircraft General Knowledge Exam

What You Need to Know

Passing score: 75%
Exam length: 80 questions
Time limit: 3 hours and 15 minutes
Exam fee: LKR 2,000

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

CPL Aircraft General Knowledge Study Tips from Top Performers

1Study system schematics in detail, focusing on flow paths, valves, and electrical bus distribution under normal and abnormal configurations.

2Understand the principles of gas turbine operations, including start cycles, compressor stalls, and fuel control unit operations.

3Practice calculations for electrical load analysis, pressure/density altitude, and magnetic compass deviations.

4Review instrument block diagrams to grasp how air data and gyroscopic systems receive inputs and how failures affect cockpit displays.

Frequently Asked Questions

What does the CAASL CPL Aircraft General Knowledge exam cover?

The exam covers four main areas in alignment with EASA Part-FCL: Airframe & Systems, Electrics, Powerplant, and Instrumentation.

How many questions are on the CAASL CPL AGK exam?

The official examination consists of 80 multiple-choice questions.

What is the time limit for the CPL AGK exam?

You have a total of 3 hours and 15 minutes to complete the exam parts.

What is the passing score for the CAASL CPL exams?

The passing score is 75%, meaning you must correctly answer at least 60 out of 80 questions.

Where is the CAASL examination conducted in Sri Lanka?

The exams are computer-based and administered at the Civil Aviation Authority of Sri Lanka (CAASL) Examination Center in Katunayake.

100+ Free CPL Aircraft General Knowledge Practice Questions

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