FAA Powerplant Written Test Exam Questions
And Answers
Based on the criteria of efficiency of an engines weight to the
power it produces, which type of engine is the best choice for an
aircraft operating at speeds of 300mph at altitudes between
20,000-25,000 ft? -
correct answer ✅Turboprop Engines
An aircraft engine has 9 cylinders. From this information alone we
can deduce that -
correct answer ✅its firing order is 1-3-5-7-9-2-4-6-8
The crankcase of an aircraft engine -
correct answer ✅Is the foundation of the engine containing
crankshaft bearings and cylinder pads
The cylinders of an engine are mounted on cylinder pads that are
machined onto the crankcases. The common method of attachment
of the cylinders to the crankcase is -
correct answer ✅by studs mounted in threaded holes in the
crankcase
The crankpin is -
correct answer ✅Hardened by nitriding and is hollow to reduce
weight
,FAA Powerplant Written Test Exam Questions
And Answers
Which statement is correct about radial engine aircraft? -
correct answer ✅Moveable counterweights serve to reduce the
dynamic vibrations in an aircraft reciprocating engine.
Master rod bearings are generally what type? -
correct answer ✅Plain
Cam-ground pistons are installed in some aircraft engines to -
correct answer ✅provide a better fit at operating temperatures
Full-floating piston pins are those which allow motion between the
pin and -
correct answer ✅the piston and the small end of the connecting
rod.
How is the oil collected by the piston oil ring returned to the
crankcase? -
correct answer ✅Through holes drilled in the piston oil ring
grooves
,FAA Powerplant Written Test Exam Questions
And Answers
Which is the primary factor in ensuring a gas tight joint between a
cylinder barrel and the cylinder head? -
correct answer ✅An initial precision fit.
Which is the typical firing order on a 4 cylinder opposed aircraft
engine? -
correct answer ✅opposed cylinders from the rear to the front.
What is the advantage of using sodium filled exhaust valves in
aircraft reciprocating engines? -
correct answer ✅reduced valve operating temperatures.
What is the purpose of the stem keys installed on the valve stems? -
correct answer ✅To hold the valve spring retaining washer in
position.
What is the purpose of installing two or more springs on each valve
in an aircraft engine? -
correct answer ✅To eliminate valve spring vibration or surging.
, FAA Powerplant Written Test Exam Questions
And Answers
Cam roller, cam rings, and cam tracks are a part of the valve
operating mechanisms of which engine type? -
correct answer ✅Radial engine.
Excessive valve clearance in a piston engine -
correct answer ✅decreases valve overlap
valve clearance changes on opposed-type engines using hydraulic
lifters are accomplished by -
correct answer ✅replacing the pushrod
Which of the following is a characteristic of a thrust bearing used in
most radial engines? -
correct answer ✅Deep-grooved ball
What is the primary advantage of using propeller reduction gears? -
correct answer ✅To enable the engine RPM to increase with an
accompanying increase in power and allow the propeller shaft to
remain at a lower rpm.
And Answers
Based on the criteria of efficiency of an engines weight to the
power it produces, which type of engine is the best choice for an
aircraft operating at speeds of 300mph at altitudes between
20,000-25,000 ft? -
correct answer ✅Turboprop Engines
An aircraft engine has 9 cylinders. From this information alone we
can deduce that -
correct answer ✅its firing order is 1-3-5-7-9-2-4-6-8
The crankcase of an aircraft engine -
correct answer ✅Is the foundation of the engine containing
crankshaft bearings and cylinder pads
The cylinders of an engine are mounted on cylinder pads that are
machined onto the crankcases. The common method of attachment
of the cylinders to the crankcase is -
correct answer ✅by studs mounted in threaded holes in the
crankcase
The crankpin is -
correct answer ✅Hardened by nitriding and is hollow to reduce
weight
,FAA Powerplant Written Test Exam Questions
And Answers
Which statement is correct about radial engine aircraft? -
correct answer ✅Moveable counterweights serve to reduce the
dynamic vibrations in an aircraft reciprocating engine.
Master rod bearings are generally what type? -
correct answer ✅Plain
Cam-ground pistons are installed in some aircraft engines to -
correct answer ✅provide a better fit at operating temperatures
Full-floating piston pins are those which allow motion between the
pin and -
correct answer ✅the piston and the small end of the connecting
rod.
How is the oil collected by the piston oil ring returned to the
crankcase? -
correct answer ✅Through holes drilled in the piston oil ring
grooves
,FAA Powerplant Written Test Exam Questions
And Answers
Which is the primary factor in ensuring a gas tight joint between a
cylinder barrel and the cylinder head? -
correct answer ✅An initial precision fit.
Which is the typical firing order on a 4 cylinder opposed aircraft
engine? -
correct answer ✅opposed cylinders from the rear to the front.
What is the advantage of using sodium filled exhaust valves in
aircraft reciprocating engines? -
correct answer ✅reduced valve operating temperatures.
What is the purpose of the stem keys installed on the valve stems? -
correct answer ✅To hold the valve spring retaining washer in
position.
What is the purpose of installing two or more springs on each valve
in an aircraft engine? -
correct answer ✅To eliminate valve spring vibration or surging.
, FAA Powerplant Written Test Exam Questions
And Answers
Cam roller, cam rings, and cam tracks are a part of the valve
operating mechanisms of which engine type? -
correct answer ✅Radial engine.
Excessive valve clearance in a piston engine -
correct answer ✅decreases valve overlap
valve clearance changes on opposed-type engines using hydraulic
lifters are accomplished by -
correct answer ✅replacing the pushrod
Which of the following is a characteristic of a thrust bearing used in
most radial engines? -
correct answer ✅Deep-grooved ball
What is the primary advantage of using propeller reduction gears? -
correct answer ✅To enable the engine RPM to increase with an
accompanying increase in power and allow the propeller shaft to
remain at a lower rpm.
