A&P Powerplant Oral Exam Prep
Test Bank | Updated Questions and
Answers Review
1.) What is the purpose of dynamic dampers on crankshaft? -✓✓They
reduce engine vibration.
2.) What types of bearing are generally found in reciprocating engines? -
✓✓Plain, ball and roller bearing.
3.) Are the connecting rods used in each cylinder of a radial engine the
same -✓✓No. Radial engines use master and articulating rod assemblies
4.) Name the different types of piston rings -✓✓Oil control,
compression and oil scraper
5.) Where should piston ring gaps be installed relative to each other, and
why? -✓✓Compression ring gaps should be staggered so that they do
not align. This prevents excessive blow-by.
6.) What could result from incorrectly installed piston ring -
✓✓Excessive oil consumption
,7.) What purpose do oil control rings serve -✓✓They regulate the
thickness of the oil film on the cylinder walls
8.) What is used to prevent valve surge or floating in an aircraft engine -
✓✓Two or more Spring are used on each valve
9.) On engines equipped with hydraulic valve lifters, what should the
running valve clearance be -✓✓Zero
10.) What is the purpose of valve overlap -✓✓It allows better volumetric
efficiency and lowers cylinder operating temperatures
Chapter 2 - Reciprocating Engine Operation, Instruments, Maintenance,
and overhaul -✓✓...
1.) What indications are given in the event of a leaking or open primer
while the engine is running -✓✓The engine will not idle properly
2.) A cold cylinder is found when troubleshooting a running engine.
What does this indicate -✓✓No combustion in that cylinder
3.) When pulling a propeller through, a hissing sound is heard,
indicating valve blow-by. What procedure should be performed next -
✓✓A compression check should be performed to identify the faulty
cylinder
,4.) What is the purpose of performing a compression test -✓✓To
determine if the valves, piston and rings are sealing properly
5.) When an engine is overhauled, how is its total time affected? When
an engine is rebuilt, how is its operating history affected -✓✓The total
time on the engine must be continued and the time since major overhaul
is entered into the engine log. If the manufacturer rebuilds the engine, it
is granted a zero-time status and is considered to have no previous
operating history
6.) What inspection should be performed after a propeller strike without
sudden stoppage -✓✓1. Inspect engine mounts, the crankcase, and the
nose section for damage. 2. Inspect the oil and oil filters/screens for
metal particles. 3. Inspect the crankshaft or driveshaft for cranks and
misalignment.
7.) Name some of the precautions that should be performed prior to
engine removal -✓✓Disconnect the battery, turn off the fuel valves,
chock the wheels, and if necessary, install a tail stand
8.) When inspecting a piston, where are cracks most likely to be found -
✓✓In those areas that are highly stressed; usually the base of piston
bosses, inside at the junction of the bore and the walls, and the ring lands
, 9.) What does it mean if an engine part is within serviceable limits -
✓✓It means that the part is within the manufacturer limits and can be
used in an engine (does not require replacement)
10.) What tools or instruments are used to inspect cylinder barrel for out
of roundness -✓✓A dial indicator or an inside micrometer is usually
used to measure the top of the cylinder and at the skirt. A telescopic
gauge and micrometer can also be used. Two reading should be taken
90# to each other.
11.) How can a loose stud in an engine crankcase be replace -
✓✓Remove the loose stud and inspect the hole for size and thread
condition. It may be necessary to use an oversize stud or Heli-Coil insert
12.) What publication is used to check an engine for normal operation -
✓✓Manufacturers maintenance manual
13.) A weak cylinder is found during a compression check. What must
be inspected -✓✓Pressure is transmitted equally in all direction
14.) What purpose does an oil analysis serve -✓✓Metal particles in the
oil show normal and abnormal wear of the engine. This help evaluating
the engines internal condition
Test Bank | Updated Questions and
Answers Review
1.) What is the purpose of dynamic dampers on crankshaft? -✓✓They
reduce engine vibration.
2.) What types of bearing are generally found in reciprocating engines? -
✓✓Plain, ball and roller bearing.
3.) Are the connecting rods used in each cylinder of a radial engine the
same -✓✓No. Radial engines use master and articulating rod assemblies
4.) Name the different types of piston rings -✓✓Oil control,
compression and oil scraper
5.) Where should piston ring gaps be installed relative to each other, and
why? -✓✓Compression ring gaps should be staggered so that they do
not align. This prevents excessive blow-by.
6.) What could result from incorrectly installed piston ring -
✓✓Excessive oil consumption
,7.) What purpose do oil control rings serve -✓✓They regulate the
thickness of the oil film on the cylinder walls
8.) What is used to prevent valve surge or floating in an aircraft engine -
✓✓Two or more Spring are used on each valve
9.) On engines equipped with hydraulic valve lifters, what should the
running valve clearance be -✓✓Zero
10.) What is the purpose of valve overlap -✓✓It allows better volumetric
efficiency and lowers cylinder operating temperatures
Chapter 2 - Reciprocating Engine Operation, Instruments, Maintenance,
and overhaul -✓✓...
1.) What indications are given in the event of a leaking or open primer
while the engine is running -✓✓The engine will not idle properly
2.) A cold cylinder is found when troubleshooting a running engine.
What does this indicate -✓✓No combustion in that cylinder
3.) When pulling a propeller through, a hissing sound is heard,
indicating valve blow-by. What procedure should be performed next -
✓✓A compression check should be performed to identify the faulty
cylinder
,4.) What is the purpose of performing a compression test -✓✓To
determine if the valves, piston and rings are sealing properly
5.) When an engine is overhauled, how is its total time affected? When
an engine is rebuilt, how is its operating history affected -✓✓The total
time on the engine must be continued and the time since major overhaul
is entered into the engine log. If the manufacturer rebuilds the engine, it
is granted a zero-time status and is considered to have no previous
operating history
6.) What inspection should be performed after a propeller strike without
sudden stoppage -✓✓1. Inspect engine mounts, the crankcase, and the
nose section for damage. 2. Inspect the oil and oil filters/screens for
metal particles. 3. Inspect the crankshaft or driveshaft for cranks and
misalignment.
7.) Name some of the precautions that should be performed prior to
engine removal -✓✓Disconnect the battery, turn off the fuel valves,
chock the wheels, and if necessary, install a tail stand
8.) When inspecting a piston, where are cracks most likely to be found -
✓✓In those areas that are highly stressed; usually the base of piston
bosses, inside at the junction of the bore and the walls, and the ring lands
, 9.) What does it mean if an engine part is within serviceable limits -
✓✓It means that the part is within the manufacturer limits and can be
used in an engine (does not require replacement)
10.) What tools or instruments are used to inspect cylinder barrel for out
of roundness -✓✓A dial indicator or an inside micrometer is usually
used to measure the top of the cylinder and at the skirt. A telescopic
gauge and micrometer can also be used. Two reading should be taken
90# to each other.
11.) How can a loose stud in an engine crankcase be replace -
✓✓Remove the loose stud and inspect the hole for size and thread
condition. It may be necessary to use an oversize stud or Heli-Coil insert
12.) What publication is used to check an engine for normal operation -
✓✓Manufacturers maintenance manual
13.) A weak cylinder is found during a compression check. What must
be inspected -✓✓Pressure is transmitted equally in all direction
14.) What purpose does an oil analysis serve -✓✓Metal particles in the
oil show normal and abnormal wear of the engine. This help evaluating
the engines internal condition
