100+ Free NCAA CPL Aircraft General Knowledge Practice Questions

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Key Facts: NCAA CPL Aircraft General Knowledge Exam

40 Qs

The exam consists of 40 multiple-choice questions.

Nig. CARs Part 2 Guidelines

60 Mins

Time allowed to complete the examination.

NCAA Examination Standards

75%

Minimum passing score required by NCAA.

Nig. CARs Part 2

~₦50,000

Exam fee per attempt.

NCAA Licensing Schedule

8 Topics

Syllabus covers 8 key technical domain areas.

NCAA CPL Syllabus

NCAA CPL Aircraft General Knowledge is a 40-question, 60-minute examination requiring a 75% passing mark for Commercial Pilot License candidates under Nig. CARs Part 2.

Sample NCAA CPL Aircraft General Knowledge Practice Questions

Try these sample questions to test your NCAA 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.

1In a semi-monocoque fuselage design, which structural components primary absorb the longitudinal bending loads?

A.Longerons and stringers combined with the skin

B.Formers and bulkheads only

C.Skin panels exclusively

D.Internal drag wires and tubular struts

Explanation: Semi-monocoque construction uses a framework of longerons, stringers, formers, and bulkheads covered by a stressed skin. Bending loads are primarily absorbed by the longitudinal members (longerons and stringers) acting together with the skin.

2What type of stress resists a force that tends to pull structural members apart?

A.Tension

B.Compression

C.Shear

D.Torsion

Explanation: Tension is the structural stress that resists a force tending to stretch or pull a body apart, such as cables or wing lower skin during normal flight.

3Which structural design philosophy ensures that the failure of a single structural member will not result in catastrophic airframe failure?

A.Fail-safe structure

B.Safe-life structure

C.Monocoque structure

D.Cantilever structure

Explanation: Fail-safe design incorporates redundant load paths so that if one structural member fails, alternative paths carry the load safely until the defect is detected during routine inspection.

4What is the primary function of wing ribs in an aircraft wing assembly?

A.To give the wing its cambered aerodynamic shape and transmit skin loads to the spar

B.To carry all primary wing bending and torsional loads independently

C.To connect the wing root directly to the fuselage carry-through structure

D.To act as primary fuel baffle plates within integral wing tanks

Explanation: Wing ribs form the aerodynamic airfoil shape (camber) of the wing and transfer aerodynamic forces acting on the skin directly to the wing spars.

5What ratio defines the relationship between the ultimate load factor and the limit load factor under civil airworthiness regulations?

A.1.50 (50% safety margin)

B.1.25 (25% safety margin)

C.2.00 (100% safety margin)

D.1.10 (10% safety margin)

Explanation: Under civil airworthiness standards (such as Nig. CARs / FAR / EASA CS-23/25), the ultimate load factor equals the limit load factor multiplied by a safety factor of 1.50.

6What type of corrosion occurs when two dissimilar metals are in direct contact in the presence of an electrolyte?

A.Galvanic corrosion

B.Intergranular corrosion

C.Stress corrosion cracking

D.Fretting corrosion

Explanation: Galvanic corrosion occurs when two metals with different electrochemical potentials are coupled together in an electrolyte, causing the more anodic metal to corrode rapidly.

7What device is installed on flight control surfaces to prevent flutter caused by aerodynamic instability?

A.Mass balance weights forward of the hinge line

B.Trim tabs placed aft of the trailing edge

C.Vortex generators on the upper surface

D.Servo tabs connected to the control Yoke

Explanation: Mass balance weights are added forward of the control surface hinge line to move the center of gravity onto or forward of the hinge line, preventing aerodynamic flutter.

8Which electrical component converts Direct Current (DC) into Alternating Current (AC)?

A.Inverter

B.Transformer-Rectifier Unit (TRU)

C.Alternator

D.Voltage Regulator

Explanation: An inverter is a static or rotary electrical device designed to convert DC power into AC power for instruments and avionics requiring AC supply.

9What is the primary function of a circuit breaker in an aircraft electrical system?

A.To protect aircraft wiring from excessive current and thermal damage

B.To regulate output voltage from the main engine alternator

C.To prevent battery discharge during ground engine start

D.To step down high voltage AC to lower voltage DC

Explanation: Circuit breakers open automatically when electrical current exceeds safe limits, protecting aircraft wiring and components from overheating and fire.

10What hazardous condition can affect Nickel-Cadmium (Ni-Cd) aircraft batteries under high charging rates?

A.Thermal runaway

B.Sulphation of plates

C.Vapor lock

D.Electrolyte boiling off leaving zero resistance

Explanation: In Ni-Cd batteries, high charging currents cause internal temperature to rise, lowering internal resistance and drawing even higher current. This vicious cycle is called thermal runaway.

About the NCAA CPL Aircraft General Knowledge Exam

The NCAA CPL Aircraft General Knowledge exam tests commercial pilot candidates in Nigeria on airframe construction, electrical systems, hydraulics, powerplants, fuel systems, flight instruments, warning systems, and ice/rain protection per Nig. CARs Part 2 requirements.

Assessment

40 multiple-choice questions administered electronically in 60 minutes.

Time Limit

60 minutes

Passing Score

75%

Exam Fee

₦20,000 (Nigeria Civil Aviation Authority (NCAA))

NCAA CPL Aircraft General Knowledge Exam Content Outline

15%

Airframe Construction & Structural Loads

Monocoque and semi-monocoque designs, load factors, structural fatigue, fail-safe principles, and aircraft materials.

15%

Aircraft Electrical Systems

AC and DC electrical generation, alternators, generators, batteries, buses, inverters, circuit breakers, and load monitoring.

15%

Hydraulic & Pneumatic Systems

Pascal's law applications, hydraulic fluids, pumps, accumulators, relief valves, and pneumatic pressure distribution.

15%

Piston & Turbine Powerplants

Four-stroke Otto cycle, detonation, pre-ignition, carburetors, fuel injection, turbocharging, and gas turbine components.

10%

Fuel Systems & Contamination

Gravity and pressure feed systems, tanks, venting, fuel selector valves, fuel contamination checks, and vapor lock.

15%

Flight Instruments & Gyroscopic Systems

Pitot-static instruments (ASI, Altimeter, VSI), blockages, gyroscopic principles (precession, rigidity), vacuum vs electrical drives.

Warning Systems & Engine Controls

Stall warning devices, fire detection/extinguishing, GPWS/TAWS, and annunciator/master warning panels.

Ice & Rain Protection Systems

De-icing vs anti-icing, pneumatic de-ice boots, thermal anti-ice, electrical heating, windshield rain removal systems.

How to Pass the NCAA CPL Aircraft General Knowledge Exam

What You Need to Know

Passing score: 75%
Assessment: 40 multiple-choice questions administered electronically in 60 minutes.
Time limit: 60 minutes
Exam fee: ₦20,000

Keys to Passing

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

NCAA CPL Aircraft General Knowledge Study Tips from Top Performers

1Understand the operational differences between monocoque and semi-monocoque fuselage structures and how structural stresses act on airframes.

2Master electrical distribution systems, including AC/DC conversion, alternator operation, battery bus ties, and circuit breaker function.

3Study pitot-static system blockages thoroughly (e.g. blocked pitot tube vs blocked static port) and how errors present on the ASI, altimeter, and VSI.

4Review gyroscopic principles including rigidity in space, precession, and how gyros are driven by vacuum or electrical systems.

5Learn the key differences between piston engine detonation vs pre-ignition and carburetor icing conditions.

6Differentiate between anti-icing (prevention) and de-icing (removal) systems for airframes and engines.

Frequently Asked Questions

What is the NCAA CPL Aircraft General Knowledge exam?

It is a mandatory theoretical knowledge examination conducted by the Nigeria Civil Aviation Authority (NCAA) under Nig. CARs Part 2 for commercial pilot applicants.

What is the passing score for the NCAA CPL AGK exam?

Candidates must achieve a score of at least 75% to pass.

How many questions are on the exam and how long is it?

The official exam contains 40 multiple-choice questions with a time limit of 60 minutes.

What topics are covered in the Aircraft General Knowledge paper?

The paper covers airframes, electrical systems, hydraulics, piston and turbine engines, fuel systems, flight instruments, warning systems, and de-icing/anti-icing systems.

How much is the NCAA exam fee?

The examination fee is approximately ₦50,000 per attempt.

100+ Free NCAA CPL Aircraft General Knowledge Practice Questions

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