1
Baker's Powerplant Oral Section Questions and
100%Verified Answers 2025 Graded A+.
How are reciprocating engines classified? - (answers)1) Cylinder Arrangement w/
respect to crankshaft (in-line, V-type, radial and opposed)
2) Method of cooling (liquid cooled, or air cooled)
what are the different types of piston rings - (answers)compression rings, oil
control rings and scraper rings
what are the main causes of a cylinder having low compression - (answers)broken
piston rings, rings that are not seated properly, burnt valves and poorly seating
valves
what is the purpose of the oil control rings? - (answers)they are used to control
the thickness of the oil film on the cylinder walls
what may be the result of installing piston rings incorrectly - (answers)excessive
oil consumption
what type of piston rods are commonly found in radial engines - (answers)a
master and articulating rod assembly
,2
what type of bearings are in general use in reciprocating engines - (answers)plain,
roller and ball bearings
what is the indication of valve blowby - (answers)a hissing or whistle when pulling
the propeller through by hand
what is the purpose of using more than one spring for valve closing -
(answers)valve springs will resonate (or surge) at certain engine speeds.
what is the purpose of valve overlap - (answers)better volumetric efficiency and
lowers the cylinder operating temperatures
describe the inspection you would give the valve springs during engine overhaul -
(answers)they should be cleaned thoroughly, then visually inspected for evidence
of overheating, cracks, broken ends, and compression strengh
what is the purpose of using valves with sodium filled stems - (answers)because it
is an excellent heat conductor
what causes engine sudden stoppage - (answers)Striking an object or engine
seizure due to internal damage.
What type inspection must be made after sudden stoppage of an engine? -
(answers)a complete engine tear down and inspection
,3
what is the purpose of the crankshaft dynamic dampers used in aircraft engines -
(answers)to overcome forces which cause deflection of the crankshaft and
torsional vibration
How would you make a "runout" check on a crankshaft that is still installed in the
engine? - (answers)remove the propeller from the crankshaft and attach a dial
indicator gauge to the front of the crankcase. adjust the position of the gauge
needle so that it is touching the shaft. rotate the crankshaft and check for
misalignment
what is detonation? - (answers)The instantaneous explosive burning of the last
portion of the charge
what cylinder is engine to magneto timing based on? - (answers)the number one
cylinder
what is engine sudden speed reduction - (answers)This occurs when the propeller
strikes an object but continues to run.
What can be learned about the condition of an engine by studying the results of a
compression check? - (answers)if the valves, piston rings, and pistons are
adequately sealing the combustion chamber
How can a cold cylinder be located on a double row radial engine? -
(answers)with a cold cylinder indicator, sometimes called a "magic wand"
, 4
what instrument can be used to check bore for out of roundness - (answers)a dial
indicator, telescopic gauge and outside micrometer or inside mircrometer
what would a cold cylinder indicate - (answers)no combustion inside the cylinder
where is a crack most likely to occur on a piston - (answers)where the piston
pin/wrist pin connects
what should be done to a nose wheel airplane before removing the engine -
(answers)support the tail of the airplane
what are the major components of a typical gas turbine engine - (answers)an air
inlet, compression section, combustion section, turbine section, exhaust section
and accessory section
what are the two principle types of compressors used in turbojet aircraft -
(answers)centrifugal flow and axial flow types
what are the four combustion chamber systems - (answers)can, can-annular,
annular, and reverse flow annular types
what is the purpose of the interconnector tubes between can types combustion
chambers - (answers)to spread the flame to the combustion chambers that are
not equipped with igniter plugs during engine starting
Baker's Powerplant Oral Section Questions and
100%Verified Answers 2025 Graded A+.
How are reciprocating engines classified? - (answers)1) Cylinder Arrangement w/
respect to crankshaft (in-line, V-type, radial and opposed)
2) Method of cooling (liquid cooled, or air cooled)
what are the different types of piston rings - (answers)compression rings, oil
control rings and scraper rings
what are the main causes of a cylinder having low compression - (answers)broken
piston rings, rings that are not seated properly, burnt valves and poorly seating
valves
what is the purpose of the oil control rings? - (answers)they are used to control
the thickness of the oil film on the cylinder walls
what may be the result of installing piston rings incorrectly - (answers)excessive
oil consumption
what type of piston rods are commonly found in radial engines - (answers)a
master and articulating rod assembly
,2
what type of bearings are in general use in reciprocating engines - (answers)plain,
roller and ball bearings
what is the indication of valve blowby - (answers)a hissing or whistle when pulling
the propeller through by hand
what is the purpose of using more than one spring for valve closing -
(answers)valve springs will resonate (or surge) at certain engine speeds.
what is the purpose of valve overlap - (answers)better volumetric efficiency and
lowers the cylinder operating temperatures
describe the inspection you would give the valve springs during engine overhaul -
(answers)they should be cleaned thoroughly, then visually inspected for evidence
of overheating, cracks, broken ends, and compression strengh
what is the purpose of using valves with sodium filled stems - (answers)because it
is an excellent heat conductor
what causes engine sudden stoppage - (answers)Striking an object or engine
seizure due to internal damage.
What type inspection must be made after sudden stoppage of an engine? -
(answers)a complete engine tear down and inspection
,3
what is the purpose of the crankshaft dynamic dampers used in aircraft engines -
(answers)to overcome forces which cause deflection of the crankshaft and
torsional vibration
How would you make a "runout" check on a crankshaft that is still installed in the
engine? - (answers)remove the propeller from the crankshaft and attach a dial
indicator gauge to the front of the crankcase. adjust the position of the gauge
needle so that it is touching the shaft. rotate the crankshaft and check for
misalignment
what is detonation? - (answers)The instantaneous explosive burning of the last
portion of the charge
what cylinder is engine to magneto timing based on? - (answers)the number one
cylinder
what is engine sudden speed reduction - (answers)This occurs when the propeller
strikes an object but continues to run.
What can be learned about the condition of an engine by studying the results of a
compression check? - (answers)if the valves, piston rings, and pistons are
adequately sealing the combustion chamber
How can a cold cylinder be located on a double row radial engine? -
(answers)with a cold cylinder indicator, sometimes called a "magic wand"
, 4
what instrument can be used to check bore for out of roundness - (answers)a dial
indicator, telescopic gauge and outside micrometer or inside mircrometer
what would a cold cylinder indicate - (answers)no combustion inside the cylinder
where is a crack most likely to occur on a piston - (answers)where the piston
pin/wrist pin connects
what should be done to a nose wheel airplane before removing the engine -
(answers)support the tail of the airplane
what are the major components of a typical gas turbine engine - (answers)an air
inlet, compression section, combustion section, turbine section, exhaust section
and accessory section
what are the two principle types of compressors used in turbojet aircraft -
(answers)centrifugal flow and axial flow types
what are the four combustion chamber systems - (answers)can, can-annular,
annular, and reverse flow annular types
what is the purpose of the interconnector tubes between can types combustion
chambers - (answers)to spread the flame to the combustion chambers that are
not equipped with igniter plugs during engine starting
