Free Practice Questions for NCAA AME Powerplant Exam Practice Test & Question Bank

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Sample NCAA AME Powerplant Exam Practice Test & Question Bank Practice Questions

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1What is the correct sequence of strokes in a four-stroke cycle reciprocating aircraft engine?

A.Intake, Power, Compression, Exhaust

B.Intake, Compression, Power, Exhaust

C.Compression, Intake, Power, Exhaust

D.Power, Intake, Compression, Exhaust

Explanation: The four-stroke Otto cycle follows a strict sequence: Intake (drawing in fuel-air mixture), Compression (compressing the charge), Power (ignition and expansion), and Exhaust (scavenging burned gases).

2What is the primary function of oil control rings on an aircraft engine piston?

A.To prevent cylinder gas leakage into the crankcase

B.To regulate the thickness of the oil film on the cylinder wall and scavenge excess oil

C.To support the wrist pin within the piston bosses

D.To transfer heat directly from the piston head to the crankshaft

Explanation: Oil control rings wipe excess oil from the cylinder wall and regulate the oil film thickness, returning excess oil to the crankcase through holes in the ring groove.

3Why is valve overlap incorporated into four-stroke engine timing schedules?

A.To prevent spark plug fouling at low idle speeds

B.To allow better cylinder scavenging and intake charge induction using gas inertia

C.To increase the compression ratio during high-altitude operation

D.To ensure complete closure of both valves during the power stroke

Explanation: Valve overlap (when both intake and exhaust valves are open simultaneously at the end of exhaust and beginning of intake) uses the momentum of escaping exhaust gases to help draw in the fresh fuel-air charge and improve volumetric efficiency.

4What is the main cause of detonation in a reciprocating engine?

A.Instantaneous uncontrolled explosion of the unburned fuel-air mixture ahead of the flame front

B.Pre-ignition caused by glowing carbon deposits before spark plug firing

C.Excessively rich fuel mixture at high power settings

D.Using an aviation fuel with an octane rating higher than specified

Explanation: Detonation is the rapid, violent explosion of the remaining unburned end-gas charge due to excessive temperature and pressure inside the cylinder.

5Which component connects the piston to the crankshaft in a reciprocating aircraft engine?

A.Push rod

B.Connecting rod

C.Rocker arm

D.Camshaft follower

Explanation: The connecting rod transmits the reciprocating force of the piston to the rotating crankshaft.

6Which thermodynamic cycle governs the operation of gas turbine engines?

A.Otto cycle

B.Diesel cycle

C.Brayton cycle

D.Carnot cycle

Explanation: Gas turbine engines operate on the constant-pressure Brayton cycle, involving continuous compression, combustion at constant pressure, expansion, and exhaust.

7What is the primary function of the compressor diffuser section in a gas turbine engine?

A.To decrease air pressure and increase air velocity before entering the combustor

B.To convert high-velocity airflow from the compressor into high static pressure

C.To mix fuel and air thoroughly prior to ignition

D.To direct exhaust gas flow toward the turbine nozzle guide vanes

Explanation: The diffuser features divergent passages that slow down high-velocity air exiting the compressor rotor, converting kinetic energy into static pressure before entering the combustion chamber.

8What is the purpose of secondary air entering the liner of a gas turbine combustion chamber?

A.To participate directly in primary flame combustion

B.To cool the liner walls and dilute hot gases to acceptable turbine entry temperatures

C.To increase fuel atomization pressure at low engine RPM

D.To prevent compressor surge during sudden acceleration

Explanation: Around 75% of airflow entering the combustor is secondary air, which forms a thermal boundary layer along liner walls and dilutes combustion gases down to safe turbine entry temperatures (TIT).

9What is the function of turbine nozzle guide vanes (NGVs)?

A.To slow down gas velocity and decrease pressure

B.To direct hot expanding gases onto turbine blades at the optimum angle and accelerate the flow

C.To drive the accessory gearbox via bevel gears

D.To compress air before entering the combustion chamber

Explanation: Turbine NGVs form convergent passages that accelerate high-pressure hot gases and direct them onto turbine rotor blades at the correct angle to exert maximum rotational torque.

10What is the main purpose of the exhaust cone assembly on a turbojet engine?

A.To accelerate exhaust gas velocity above Mach 2

B.To collect exhaust gases from the turbine and transform turbulent swirl into a smooth axial flow

C.To ignite unburned fuel remnants for extra thrust

D.To cool exhaust gas before exit

Explanation: The exhaust cone cone assembly (inner cone and strut supports) collects gases exiting the turbine, eliminates gas swirl, and provides a smooth, non-turbulent axial stream into the tailpipe.

About the NCAA AME Powerplant Exam Practice Test & Question Bank Exam

Prepare for the official NCAA Aircraft Maintenance Engineer Licence - Powerplant (Nigeria) administered by Nigeria Civil Aviation Authority (NCAA). Covers all required domains under Nigerian regulations.

Exam sponsor: Nigeria Civil Aviation Authority (NCAA). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

60 questions

Time Limit

120 minutes

Passing Score

75%

Exam / Certification Fees

₦20,000

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Nigeria Civil Aviation Authority (NCAA): official exam information

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.

30%

Regulations & Law

Civil aviation regulations, licensing rules, and operational requirements.

40%

Technical & Practical Operations

Operational procedures, systems, safety, and phraseology.

30%

Emergency & Special Procedures

Emergency responses, abnormal situations, and distress communications.

Preparing for the NCAA AME Powerplant Exam Practice Test & Question Bank Exam

What You Need to Know

Passing score: 75%
Exam length: 60 questions
Time limit: 120 minutes
Exam / certification fees: ₦20,000 Official sources

Using Our Practice Resources

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NCAA AME Powerplant Exam Practice Test & Question Bank: Suggested Study Strategy

1Review official Nig. CARs regulations thoroughly.

2Practice high-frequency multiple choice questions.

3Master standard phraseology and procedures.

Frequently Asked Questions

What is the passing score for NCAA AME Powerplant Exam Practice Test & Question Bank?

The passing score is 75%.

Free Practice Questions for NCAA AME Powerplant Exam Practice Test & Question Bank

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