Powerplant Reciprocating Engines Questions With
Complete Solutions
(1) Cast iron piston rings may be used in chrome-plated
cylinders.
(2) Chrome-plated rings may be used in plain steel cylinders.
Regarding the above statements, Correct Answer c. both No.
1 and No. 2 are true.
both 1 and 2 are true.
(1) Preignition is caused by improper ignition timing.
(2) Detonation occurs when an area of the combustion chamber
becomes incandescent and ignites the fuel/air mixture in
advance of normal timed ignition.
Regarding the above statements, Correct Answer c. neither
No. 1 nor 2 is true
preignition detonation
neither No. 1 nor 2 is true
A characteristic of dyna-focal engine mounts as applied to
aircraft reciprocating engines is that the Correct Answer
shock mounts point toward the engine's center of gravity.
,A condition that can occur in radial engines but is unlikely to
occur in horizontally opposed engines is Correct Answer c.
hydraulic lock.
hydraulic lock.
A hissing sound from the exhaust stacks when the propeller is
being pulled through manually indicates Correct Answer b.
exhaust valve blow-by.
exhaust valve blow-by
A nine-cylinder engine with a bore of 5.5 inches and a stroke of
6 inches will have a total piston displacement of Correct
Answer c. 1,283 cubic inches.
1,283 cubic inches.
After spark plugs from an opposed engine have been serviced, in
what position should they be reinstalled? Correct Answer c.
next in firing order to the one from which the were remover and
swapped bottom to top.
next in firing order to the one from which the were remover and
swapped bottom to top.
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 a. during normal operation.
during normal operation
An engine misses in BOTH the right and left positions of the
magneto switch. The quickest method for locating the trouble is
to Correct Answer a. check for one or MORE cold cylinders.
check for one or MORE cold cylinders.
An INCREASE in manifold pressure with a constant RPM will
cause the bearing LOAD in an engine to Correct Answer c.
increase.
increase.
An unsupercharged aircraft reciprocating engine, operated at full
throttle from sea level, to 10,000 feet, provided the RPM is
unchanged, will Correct Answer c. lose power due to the
reduced density of the air drawn in to the cylinders.
Complete Solutions
(1) Cast iron piston rings may be used in chrome-plated
cylinders.
(2) Chrome-plated rings may be used in plain steel cylinders.
Regarding the above statements, Correct Answer c. both No.
1 and No. 2 are true.
both 1 and 2 are true.
(1) Preignition is caused by improper ignition timing.
(2) Detonation occurs when an area of the combustion chamber
becomes incandescent and ignites the fuel/air mixture in
advance of normal timed ignition.
Regarding the above statements, Correct Answer c. neither
No. 1 nor 2 is true
preignition detonation
neither No. 1 nor 2 is true
A characteristic of dyna-focal engine mounts as applied to
aircraft reciprocating engines is that the Correct Answer
shock mounts point toward the engine's center of gravity.
,A condition that can occur in radial engines but is unlikely to
occur in horizontally opposed engines is Correct Answer c.
hydraulic lock.
hydraulic lock.
A hissing sound from the exhaust stacks when the propeller is
being pulled through manually indicates Correct Answer b.
exhaust valve blow-by.
exhaust valve blow-by
A nine-cylinder engine with a bore of 5.5 inches and a stroke of
6 inches will have a total piston displacement of Correct
Answer c. 1,283 cubic inches.
1,283 cubic inches.
After spark plugs from an opposed engine have been serviced, in
what position should they be reinstalled? Correct Answer c.
next in firing order to the one from which the were remover and
swapped bottom to top.
next in firing order to the one from which the were remover and
swapped bottom to top.
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 a. during normal operation.
during normal operation
An engine misses in BOTH the right and left positions of the
magneto switch. The quickest method for locating the trouble is
to Correct Answer a. check for one or MORE cold cylinders.
check for one or MORE cold cylinders.
An INCREASE in manifold pressure with a constant RPM will
cause the bearing LOAD in an engine to Correct Answer c.
increase.
increase.
An unsupercharged aircraft reciprocating engine, operated at full
throttle from sea level, to 10,000 feet, provided the RPM is
unchanged, will Correct Answer c. lose power due to the
reduced density of the air drawn in to the cylinders.
