FAA Powerplant Written Test - Chapter 1 -
Reciprocating Engines Exam UPDATED
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Which statement is true regarding bearings used in high-powered reciprocating aircraft
engines? - CORRECT ANSWER There is less rolling friction when ball bearings are
used than when roller bearings are employed
What is the principle advantage of using propeller reduction gears? - CORRECT
ANSWER To enable the engine RPM to be increased with an accompanying increase
in power and allow the propeller to remain at a lower, more efficient RPM
Which of the following is a characteristic of a thrust bearing used in most radial engines? -
CORRECT ANSWER Deep-groove ball
Which bearing is least likely to be a roller or ball bearing? - CORRECT
ANSWER Master rod bearing (radial engine)
The operating temperature valve clearance of a radial engine as compared to cold valve
clearance is - CORRECT ANSWER Greater
Which statement is correct regarding engine crankshafts? - 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
, Some aircraft engine manufacturers equip their product with choked or taper-ground
cylinders in order to - CORRECT ANSWER Provide a straight cylinder bore at
operating temperatures
An aircraft reciprocating engine using hydraulic valve lifters is observed to have no clearance
in its valve-operating mechanism after the minimum inlet oil and cylinder head temperatures
for takeoff have been reached. When can this condition be expected? - CORRECT
ANSWER During normal operation
Some cylinder barrels are hardened by - CORRECT ANSWER Nitriding
What is the purpose of the safety circlet installed on some valve stems? - CORRECT
ANSWER To prevent valves from falling into the combustion chamber
The valve clearance of an engine using hydraulic lifters, when the lifters are completely flat,
or empty, should not exceed - CORRECT ANSWER A specified amount above zero
Full-floating piston pins are those which allow motion between the pin and - CORRECT
ANSWER Both the piston and the small end of the connecting rod
If the hot clearance is used to set the valves when the engine is cold, what will occur during
operation of the engine? - CORRECT ANSWER The valves will open late and close
early
The purpose of two or more valve springs in aircraft engines is to - CORRECT
ANSWER Eliminate valve spring surge
What special procedure must be followed when adjusting the valves of an engine equipped
with a floating cam ring? - CORRECT ANSWER Eliminate cam bearing clearance
when making valve adjustment
What is an advantage of using metallic-sodium filled exhaust valves in aircraft reciprocating
engines? - CORRECT ANSWER Reduced valve operating temperatures
Reciprocating Engines Exam UPDATED
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Which statement is true regarding bearings used in high-powered reciprocating aircraft
engines? - CORRECT ANSWER There is less rolling friction when ball bearings are
used than when roller bearings are employed
What is the principle advantage of using propeller reduction gears? - CORRECT
ANSWER To enable the engine RPM to be increased with an accompanying increase
in power and allow the propeller to remain at a lower, more efficient RPM
Which of the following is a characteristic of a thrust bearing used in most radial engines? -
CORRECT ANSWER Deep-groove ball
Which bearing is least likely to be a roller or ball bearing? - CORRECT
ANSWER Master rod bearing (radial engine)
The operating temperature valve clearance of a radial engine as compared to cold valve
clearance is - CORRECT ANSWER Greater
Which statement is correct regarding engine crankshafts? - 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
, Some aircraft engine manufacturers equip their product with choked or taper-ground
cylinders in order to - CORRECT ANSWER Provide a straight cylinder bore at
operating temperatures
An aircraft reciprocating engine using hydraulic valve lifters is observed to have no clearance
in its valve-operating mechanism after the minimum inlet oil and cylinder head temperatures
for takeoff have been reached. When can this condition be expected? - CORRECT
ANSWER During normal operation
Some cylinder barrels are hardened by - CORRECT ANSWER Nitriding
What is the purpose of the safety circlet installed on some valve stems? - CORRECT
ANSWER To prevent valves from falling into the combustion chamber
The valve clearance of an engine using hydraulic lifters, when the lifters are completely flat,
or empty, should not exceed - CORRECT ANSWER A specified amount above zero
Full-floating piston pins are those which allow motion between the pin and - CORRECT
ANSWER Both the piston and the small end of the connecting rod
If the hot clearance is used to set the valves when the engine is cold, what will occur during
operation of the engine? - CORRECT ANSWER The valves will open late and close
early
The purpose of two or more valve springs in aircraft engines is to - CORRECT
ANSWER Eliminate valve spring surge
What special procedure must be followed when adjusting the valves of an engine equipped
with a floating cam ring? - CORRECT ANSWER Eliminate cam bearing clearance
when making valve adjustment
What is an advantage of using metallic-sodium filled exhaust valves in aircraft reciprocating
engines? - CORRECT ANSWER Reduced valve operating temperatures
