III.A.K2 Flashcards
- What is the principal advantage of using prop reduction gears?
To enable engine RPM to be increased with an accompanying increase in power and allow the prop to remain at a lower, more efficient RPM.
- Which of the following will decrease volumetric efficiency in a reciprocating engine?
Improper valve timing, sharp bends in the induction system, and high carburetor air temps.
- A 9 cylinder engine with a bore of 5.6 inches and a stroke of 6 inches will have a total piston displacement of?
1283 cubic inches.
- 5 events of a 4 stroke cycle engine in the order of their occurrence are?
Intake, compression, ignition, power,and exhaust.
- On which strokes are both valves on a 4 stroke cycle reciprocating aircraft engine open?
Exhaust and intake.
- 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 temps for takeoff have been reached. When can this condition be expected?
During normal operation.
- If the intake valve is opened too early in the cycle of operation of a 4 stroke cycle engine, it may result in?
Backfiring into the induction system.
- Which statement is correct regarding a 4 stroke cycle engine?
The intake valve closes on the compression stroke.
- When is the air fuel mixture ignited in a conventional reciprocating engine?
Shortly before the piston reaches the top of the compression stroke.
- If the exhaust valve of a 4 stroke cycle engine is closed and the intake valve is just closed, the piston is on the?
Compression stroke.
- A characteristic of dyna focal engine mounts as applied to aircraft reciprocating engines is that the?
Shock mounts point toward the engine’s center of gravity.
- When does valve overlap occur in the operation of an aircraft reciprocating engine?
At the end of the exhaust stroke and beginning of intake stroke.
- What is an advantage of using metallic sodium filled exhaust valves in aircraft reciprocating engines?
Reduces valve operating temps.
- What is likely to occur if a reciprocating engine is operated at high power settings before it is properly warmed up?
Oil starvation of bearings and other parts.
- Increased water vapor (higher relative humidity) in the incoming air to a reciprocating engine will normally result in which of the following?
Decreased engine power at a constant RPM and manifold pressure.
- One of the best indicators of reciprocating engine combustion chamber problems is?
Spark plug condition.
- To what altitude will a turbo engine maintain sea level pressure?
Critical altitude.
