BAKERS ORAL POWERPLANT
COMPREHENSIVE TEST BANK SOLVED
QUESTIONS VERIFIED ANSWERS RESOURCE
●● How are conventional reciprocating engines classified?
Answer: according to cylinder arrangement with respect to the
crankshaft or according to cooling
●● What are the different types of piston rings?
Answer: Compression rings, oil control rings, and scraper rings.
●● What are the main causes of a cylinder having low compression?
Answer: Broken piston rings or rings that aren't seating properly, burnt
valves/poorly seating valves.
●● What is the purpose of the oil control rings?
Answer: They are used to control the thickness of the oil on the cylinder
walls.
●● What may be the result of installing piston rings incorrectly?
Answer: Excessive oil consumption
,●● What type of piston rods are commonly found in radial engines?
Answer: Master and articulating rod assembly.
●● What type of bearings are in general use in reciprocating engines?
Answer: Plain, roller, and ball
●● What is the indication of valve blow-by?
Answer: Valve blow-by is indicated by a hissing or whistle when pulling
the propeller through prior to starting the engine. A cylinder compression
check should be made to identify the faulty cylinder.
●● What is the purpose of using more than one spring for valve closing?
Answer: To prevent valve springs surging/floating
●● What is the purpose of valve overlap?
Answer: It permits better volumetric efficiency and lowers the cylinder
operating temperature.
●● Describe the inspection you would give the valve springs during
engine overhaul.
Answer: cleaned and inspected for evidence of overheating, cracks,
broken ends, and compression strength.
,●● What is the purpose of using valves with sodium filled stems?
Answer: Aid in heat increased dissipation.
●● What causes engine sudden stoppage?
Answer: Striking an object or engine seizure due to internal failure
●● What type inspection must be made after sudden stoppage of an
engine?
Answer: Tear down and inspection
●● What is the purpose of the crankshaft dynamic dampers used in
aircraft engines?
Answer: to eliminate vibration for smooth operation
●● How would you make a "runout" check on a crankshaft that is still
installed in the engine?
Answer: Use dial indicator on front flange of crankshaft, rotate
crankshaft while checking alignment
●● What is detonation?
Answer: Uncontrolled ignition that degrades engine performance, it can
lead to failure of the piston, cylinder, and valves
, ●● What cylinder is engine to magneto timing based on?
Answer: #1 cylinder 25-30* BTDC
●● What is engine sudden speed reduction?
Answer: When the propeller strikes a yielding medium without stopping.
Warrants an internal inspection, oil analysis, and inspection of propeller
●● What can be learned about the condition of an engine by studying the
results of a compression check?
Answer: Determine whether rings, valves, and pistons are properly
sealing
●● How can a cold cylinder be located on a double row radial engine?
Answer: Iinfrared thermometer.
●● What instrument can be used to check bore for out of roundness?
Answer: The use of a dial indicator or telescopic gauge, and
inside/outside micrometer
●● What would a cold cylinder indicate?
Answer: No combustion
●● Where is a crack most likely to occur on a piston?
COMPREHENSIVE TEST BANK SOLVED
QUESTIONS VERIFIED ANSWERS RESOURCE
●● How are conventional reciprocating engines classified?
Answer: according to cylinder arrangement with respect to the
crankshaft or according to cooling
●● What are the different types of piston rings?
Answer: Compression rings, oil control rings, and scraper rings.
●● What are the main causes of a cylinder having low compression?
Answer: Broken piston rings or rings that aren't seating properly, burnt
valves/poorly seating valves.
●● What is the purpose of the oil control rings?
Answer: They are used to control the thickness of the oil on the cylinder
walls.
●● What may be the result of installing piston rings incorrectly?
Answer: Excessive oil consumption
,●● What type of piston rods are commonly found in radial engines?
Answer: Master and articulating rod assembly.
●● What type of bearings are in general use in reciprocating engines?
Answer: Plain, roller, and ball
●● What is the indication of valve blow-by?
Answer: Valve blow-by is indicated by a hissing or whistle when pulling
the propeller through prior to starting the engine. A cylinder compression
check should be made to identify the faulty cylinder.
●● What is the purpose of using more than one spring for valve closing?
Answer: To prevent valve springs surging/floating
●● What is the purpose of valve overlap?
Answer: It permits better volumetric efficiency and lowers the cylinder
operating temperature.
●● Describe the inspection you would give the valve springs during
engine overhaul.
Answer: cleaned and inspected for evidence of overheating, cracks,
broken ends, and compression strength.
,●● What is the purpose of using valves with sodium filled stems?
Answer: Aid in heat increased dissipation.
●● What causes engine sudden stoppage?
Answer: Striking an object or engine seizure due to internal failure
●● What type inspection must be made after sudden stoppage of an
engine?
Answer: Tear down and inspection
●● What is the purpose of the crankshaft dynamic dampers used in
aircraft engines?
Answer: to eliminate vibration for smooth operation
●● How would you make a "runout" check on a crankshaft that is still
installed in the engine?
Answer: Use dial indicator on front flange of crankshaft, rotate
crankshaft while checking alignment
●● What is detonation?
Answer: Uncontrolled ignition that degrades engine performance, it can
lead to failure of the piston, cylinder, and valves
, ●● What cylinder is engine to magneto timing based on?
Answer: #1 cylinder 25-30* BTDC
●● What is engine sudden speed reduction?
Answer: When the propeller strikes a yielding medium without stopping.
Warrants an internal inspection, oil analysis, and inspection of propeller
●● What can be learned about the condition of an engine by studying the
results of a compression check?
Answer: Determine whether rings, valves, and pistons are properly
sealing
●● How can a cold cylinder be located on a double row radial engine?
Answer: Iinfrared thermometer.
●● What instrument can be used to check bore for out of roundness?
Answer: The use of a dial indicator or telescopic gauge, and
inside/outside micrometer
●● What would a cold cylinder indicate?
Answer: No combustion
●● Where is a crack most likely to occur on a piston?
