100+ Free NCAA CPL (H) Theory Practice Questions

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2026 Statistics

Key Facts: NCAA CPL (H) Theory Exam

Questions

NCAA Examinations Division

Minutes

NCAA Examinations Division

75%

Passing Score

Nig. CARs Part 2

₦50,000

Exam Fee (NGN)

NCAA Statutory Fees 2026

24 Mo.

Result Validity

Nig. CARs Part 2

NCAA

Exam Body

Nigeria Civil Aviation Authority

The NCAA CPL (Helicopter) Theory Exam consists of 45 multiple-choice questions administered over 90 minutes. A passing score of 75% is required. The statutory exam fee is ₦50,000 NGN. Candidates are tested across four key areas: Advanced Aerodynamics, Systems & Turbine Engines, Performance & Loading, and Nig. CARs Commercial Regulations.

Sample NCAA CPL (H) Theory Practice Questions

Try these sample questions to test your NCAA CPL (H) Theory 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 cause of dissymmetry of lift in forward helicopter flight?

A.Unequal air density between advancing and retreating sides of the rotor disc

B.The differential relative wind speed acting on the advancing blade compared to the retreating blade

C.Variations in engine torque delivered to the main rotor mast during forward acceleration

D.Differences in blade chord line profile along the span of the main rotor blade

Explanation: Dissymmetry of lift is caused by the difference in relative wind speed experienced by the advancing blade (rotational speed plus forward airspeed) versus the retreating blade (rotational speed minus forward airspeed).

2How does a helicopter rotor system automatically compensate for dissymmetry of lift in forward flight?

A.By blade flapping, where the advancing blade flaps up decreasing its angle of attack and the retreating blade flaps down increasing its angle of attack

B.By manual pilot cyclic inputs applied constantly to balance blade lift forces

C.By engine governor adjustments that increase main rotor RPM on the advancing side

D.By automatic pitch change links that lock the advancing blade pitch to zero degrees

Explanation: Blade flapping allows the advancing blade to flap upward (reducing its effective angle of attack and lift) and the retreating blade to flap downward (increasing its effective angle of attack and lift), balancing total lift across the rotor disc.

3Which mechanical component disengages the main rotor from the engine during an engine failure to allow autorotation?

A.The swashplate assembly

B.The freewheeling unit (sprag clutch)

C.The rotor brake caliper

D.The main transmission planetary governor

Explanation: The freewheeling unit (sprag clutch) automatically disengages the engine drive shaft from the main transmission whenever engine RPM drops below main rotor RPM, allowing the rotor to rotate freely.

4Why does a helicopter require less power to hover In Ground Effect (HIGE) than Out of Ground Effect (HOGE)?

A.Because ground effect increases main rotor RPM automatically

B.Because the proximity of the ground reduces induced flow velocity and tip vortex strength, increasing rotor efficiency

C.Because engine air intake pressure is doubled by ground reflection

D.Because ground effect eliminates tail rotor anti-torque power requirements

Explanation: Within approximately one rotor diameter of the ground, the surface restricts the downward flow of air (induced flow) and reduces tip vortices. This increases the effective angle of attack, requiring less pitch and power to generate required lift.

5What aerodynamic condition imposes the absolute forward speed limit (Vne) on a helicopter due to retreating blade stall?

A.High forward speed causing the retreating blade to exceed its critical angle of attack as relative wind decreases

B.High forward speed causing supersonic shockwaves on the advancing blade tip exclusively

C.Low rotor RPM causing the advancing blade to stall near the root hub

D.Tail rotor overspeed caused by high forward airflow velocity

Explanation: As forward speed increases, the retreating blade must operate at higher angles of attack to compensate for lower relative wind speed. Eventually, the blade exceeds its critical angle of attack and stalls, setting Vne.

6Due to gyroscopic precession, if a control force is applied to a rotor disc, where does the maximum aerodynamic response occur?

A.At the exact point where the force is applied

B.90 degrees later in the direction of rotation

C.90 degrees earlier in the direction of rotation

D.180 degrees opposite to the point of force application

Explanation: Gyroscopic precession causes an applied force to manifest its maximum deflection approximately 90 degrees later in the direction of rotor disc rotation.

7What is the primary function of the swashplate assembly in a helicopter control system?

A.To transmit pilot cyclic and collective control inputs from the non-rotating control linkages to the rotating main rotor blades

B.To automatically adjust tail rotor pitch in response to main rotor torque changes

C.To decouple the engine drive shaft from the main gearbox during autorotation

D.To dampen ground resonance vibrations transmitted through the rotor mast

Explanation: The swashplate translates non-rotating control movements from cyclic and collective sticks into rotating control inputs that change the pitch angle of the main rotor blades.

8What is the primary purpose of a conventional tail rotor in a single-rotor helicopter?

A.To provide forward thrust during high-speed cruise flight

B.To counteract the torque effect created by driving the main rotor and provide directional yaw control

C.To assist the main rotor in generating vertical lift during hover

D.To balance the longitudinal center of gravity during fuel consumption

Explanation: According to Newton's third law, driving the main rotor creates an equal and opposite torque reaction on the fuselage. The tail rotor produces lateral thrust to counteract this torque and allow heading control.

9In a free-turbine turboshaft engine, what is the key mechanical difference between the gas producer turbine (N1/Ng) and the power turbine (N2/Nf)?

A.The gas producer turbine and power turbine are mechanically connected on a single rigid shaft

B.The power turbine is mechanically independent of the gas producer turbine, driven only by expanding exhaust gases

C.The gas producer turbine drives the main rotor directly while the power turbine drives the engine accessories

D.The power turbine operates only during engine start and disengages at idle RPM

Explanation: In a free-turbine engine, the gas producer spool (compressor + N1 turbine) has no direct mechanical link to the power turbine (N2). Hot expanding exhaust gases drive the N2 turbine, which drives the main rotor transmission.

10What critical flight safety information is provided by the Height-Velocity (H-V) diagram (dead man's curve)?

A.The combination of altitude and airspeed from which a safe autorotative landing cannot be guaranteed following an engine failure

B.The maximum operating ceiling of the helicopter based on ambient air temperature

C.The optimum airspeed for maximum endurance versus maximum range in cruise flight

D.The structural load factor limits of the main rotor hub during steep banked turns

Explanation: The Height-Velocity diagram identifies specific combination zones of height above ground and forward airspeed that must be avoided because successful autorotation entry and flare before impact are extremely difficult or impossible.

About the NCAA CPL (H) Theory Exam

The NCAA Commercial Pilot Licence (Helicopter) Theory Exam is the official theoretical knowledge assessment required by the Nigeria Civil Aviation Authority under Nig. CARs Part 2. It tests commercial rotorcraft candidates on rotorcraft aerodynamics, helicopter flight systems and turbine powerplants, flight performance and weight/balance calculations, and Nigerian civil aviation regulations governing commercial helicopter operations.

Questions

45 scored questions

Time Limit

90 minutes

Passing Score

75%

Exam Fee

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

NCAA CPL (H) Theory Exam Content Outline

25%

Rotorcraft Aerodynamics & Principles of Flight

Covers dissymmetry of lift and cyclic blade flapping/feathering, autorotation aerodynamic regions (driven, driving, stall), vortex ring state (settling with power) mechanics and recovery, ground effect (HIGE vs HOGE), retreating blade stall, transverse flow effect, and translational lift.

25%

Helicopter Systems, Main/Tail Rotors & Powerplants

Examines fully articulated, semi-rigid underslung, and rigid rotor hub designs, swashplate and control mixing mechanisms, tail rotor aerodynamics and fenestron/NOTAR systems, main transmission gearboxes and freewheeling units, and turboshaft engine operation (gas generator vs free power turbine).

25%

Rotorcraft Performance, Weight & Balance

Includes quantitative calculations for hovering ceiling (HIGE vs HOGE), autorotative rates of descent based on gross weight and density altitude, height-velocity diagram avoidance zones (dead man's curve), center of gravity limits (longitudinal and lateral), and payload/fuel endurance planning.

25%

Nig. CARs & Helicopter Commercial Operations

Focuses on Nig. CARs Part 2 commercial pilot privileges and currency requirements, commercial air transport operational standards (Parts 8 & 9), VFR cloud clearance and visibility minima for helicopters, fuel margin requirements, and emergency equipment standards.

How to Pass the NCAA CPL (H) Theory Exam

What You Need to Know

Passing score: 75%
Exam length: 45 questions
Time limit: 90 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 (H) Theory Study Tips from Top Performers

1Master quantitative hover performance charts (HIGE vs HOGE) and autorotative descent rate calculations under varying density altitudes and gross weights.

2Understand the aerodynamic causes of vortex ring state (settling with power) and compare standard recovery (cyclic forward/collective reduction) with the Vuichard recovery technique.

3Memorize Nig. CARs Part 2 commercial pilot privileges, currency requirements (e.g., 3 takeoffs and landings in 90 days for carrying passengers), and fuel reserve rules for VFR helicopter flights.

4Study free-turbine engine operating principles, including N1 (gas generator RPM) vs N2/NR (power turbine/rotor RPM) relationships and governor behavior.

5Review the Height-Velocity (H-V) diagram (dead man's curve) to identify high-risk altitude/airspeed combination zones during takeoff and landing.

Frequently Asked Questions

What is the format and duration of the NCAA CPL (Helicopter) Theory Exam?

The exam consists of 45 multiple-choice questions administered on a computer-based testing (CBT) platform at designated NCAA examination centers in Nigeria. Candidates are allowed 90 minutes to complete the test.

What is the passing score and retake policy for the NCAA CPL(H) exam?

The passing score is 75%. If a candidate fails, they must wait at least 14 days before re-sitting the exam and provide a remedial ground training sign-off from an NCAA Approved Training Organization (ATO).

How much is the NCAA CPL(H) exam fee in 2026?

The statutory examination fee for the NCAA Commercial Pilot Licence (Helicopter) Theory Exam is ₦50,000 NGN per attempt.

What flight experience is required to sit for the CPL(H) theory exam under Nig. CARs Part 2?

Candidates must be enrolled in or have completed an NCAA-approved CPL(H) ground school program and hold a valid PPL(H) or student pilot license with at least 100-150 flight hours depending on whether the training is integrated or modular.

What primary topics carry the highest importance on the exam?

Key high-weight topics include dissymmetry of lift compensation, autorotation aerodynamic mechanics, vortex ring state recognition and recovery, turbine engine operating limits, HIGE/HOGE performance charts, and Nig. CARs Part 2 commercial pilot operational limitations.

100+ Free NCAA CPL (H) Theory Practice Questions

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