Powerplant Orals (ASA) Exam Questions
And Answers
What is used in an aircraft engine to help prevent valve surge or
float from occurring -
correct answer ✅Two or more springs on each valve
When an engine is rebuilt by the manufacturer, how is its operating
history affected -
correct answer ✅A rebuilt engine is considered to have no
previous operating history and can therefore be issued a zero-time
record
What may be the result of incorrect installation of piston rings -
correct answer ✅Excessive oil consumption
What are some of the precautions to be observed when preparing
an aircraft for engine removal -
correct answer ✅Disconnect the battery, chock the wheels, install
a tail stand (if needed) and turn off the fuel valves
What is meant when it is said that an engine part is within
"servicable limits" -
correct answer ✅A part that is within "serviceable limits" will not
likely wear to the point causing engine failure within the next
between overhaul interval
,Powerplant Orals (ASA) Exam Questions
And Answers
What is the purpose of crankshaft dynamic dampers -
correct answer ✅to reduce engine vibration
what is the purpose of valve overlap -
correct answer ✅it permits better volumetric efficiency and lowers
the cylinder operating temp
what are the different types of different piston rings -
correct answer ✅Compression, oil control, and oil scraper
What types of bearing are in general use in recip engines -
correct answer ✅Plain, ball, roller
where are cracks most likely to be found in the piston -
correct answer ✅highly stressed areas the base of the piston
bosses, inside the junction of the head and walls, and in the ring
lands
what types of connecting rods are commonly found in radial
engines -
correct answer ✅master and articulated rod assemblies
,Powerplant Orals (ASA) Exam Questions
And Answers
When troublshooting a running engine malfunction, what does a
cold cylinder indicate -
correct answer ✅lack of combustion in that cylinder
what procedure should be followed when valve blow-by is indicated
by a hissing sound on the recip engine when pulling the prop
through -
correct answer ✅perform a cylinder compression test to identify
the faulty cylinder
what is the running valve clearance on engines equipped with
hydraulic valve lifters -
correct answer ✅zero
what factors about the condition of an enigine can be learned by
studying the results of a compression test -
correct answer ✅the results of a compression test determine if
the valves, piston rings and pistons are adequately sealing
what would the possible cause be for a turbojet or turbofan engine
having high gas temp, low rpm, and high fuel flow at all engine
, Powerplant Orals (ASA) Exam Questions
And Answers
pressure ratio settings -
correct answer ✅possible turbine damage or loss of turbine
efficiency
what is used to mark both hot and cold section for repair -
correct answer ✅felt markers, chalk or layout dye
what type compressor blade damage may be found when
inspecting compressor blades -
correct answer ✅dents, galling, pitting, cracks, scratches, burrs,
burns and gouges
what are the functions of axial flow turbine nozzles -
correct answer ✅the prepare the mass airflow for driving the
turbine rotor and deflect the gases to a specific angle
what methods are commonly used to accomplish turbine engine
compressor field cleaning -
correct answer ✅fluid wash or abrasive grit blast
what are carbon seals used for in a turbine engine -
correct answer ✅as oil seals for the rotor shaft bearings
And Answers
What is used in an aircraft engine to help prevent valve surge or
float from occurring -
correct answer ✅Two or more springs on each valve
When an engine is rebuilt by the manufacturer, how is its operating
history affected -
correct answer ✅A rebuilt engine is considered to have no
previous operating history and can therefore be issued a zero-time
record
What may be the result of incorrect installation of piston rings -
correct answer ✅Excessive oil consumption
What are some of the precautions to be observed when preparing
an aircraft for engine removal -
correct answer ✅Disconnect the battery, chock the wheels, install
a tail stand (if needed) and turn off the fuel valves
What is meant when it is said that an engine part is within
"servicable limits" -
correct answer ✅A part that is within "serviceable limits" will not
likely wear to the point causing engine failure within the next
between overhaul interval
,Powerplant Orals (ASA) Exam Questions
And Answers
What is the purpose of crankshaft dynamic dampers -
correct answer ✅to reduce engine vibration
what is the purpose of valve overlap -
correct answer ✅it permits better volumetric efficiency and lowers
the cylinder operating temp
what are the different types of different piston rings -
correct answer ✅Compression, oil control, and oil scraper
What types of bearing are in general use in recip engines -
correct answer ✅Plain, ball, roller
where are cracks most likely to be found in the piston -
correct answer ✅highly stressed areas the base of the piston
bosses, inside the junction of the head and walls, and in the ring
lands
what types of connecting rods are commonly found in radial
engines -
correct answer ✅master and articulated rod assemblies
,Powerplant Orals (ASA) Exam Questions
And Answers
When troublshooting a running engine malfunction, what does a
cold cylinder indicate -
correct answer ✅lack of combustion in that cylinder
what procedure should be followed when valve blow-by is indicated
by a hissing sound on the recip engine when pulling the prop
through -
correct answer ✅perform a cylinder compression test to identify
the faulty cylinder
what is the running valve clearance on engines equipped with
hydraulic valve lifters -
correct answer ✅zero
what factors about the condition of an enigine can be learned by
studying the results of a compression test -
correct answer ✅the results of a compression test determine if
the valves, piston rings and pistons are adequately sealing
what would the possible cause be for a turbojet or turbofan engine
having high gas temp, low rpm, and high fuel flow at all engine
, Powerplant Orals (ASA) Exam Questions
And Answers
pressure ratio settings -
correct answer ✅possible turbine damage or loss of turbine
efficiency
what is used to mark both hot and cold section for repair -
correct answer ✅felt markers, chalk or layout dye
what type compressor blade damage may be found when
inspecting compressor blades -
correct answer ✅dents, galling, pitting, cracks, scratches, burrs,
burns and gouges
what are the functions of axial flow turbine nozzles -
correct answer ✅the prepare the mass airflow for driving the
turbine rotor and deflect the gases to a specific angle
what methods are commonly used to accomplish turbine engine
compressor field cleaning -
correct answer ✅fluid wash or abrasive grit blast
what are carbon seals used for in a turbine engine -
correct answer ✅as oil seals for the rotor shaft bearings
