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100+ Free NCAA AME Powerplant Exam Practice Test & Question Bank Practice Questions
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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.
Questions
60 scored questions
Time Limit
120 minutes
Passing Score
75%
Exam Fee
₦20,000 (Nigeria Civil Aviation Authority (NCAA))
NCAA AME Powerplant Exam Practice Test & Question Bank Exam Content Outline
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.
How to Pass 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 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 AME Powerplant Exam Practice Test & Question Bank Study Tips from Top Performers
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%.