A&P Reciprocating Engine Systems Questions and Answers

Question 1

What is a primary advantage of a dry-sump lubrication system compared to a wet-sump system for a reciprocating engine used in aerobatic aircraft?

Accepted Answer

It provides a more consistent oil supply to components regardless of aircraft attitude.

Answer

It requires a lower total volume of oil to operate.

Answer

It simplifies the overall system design, reducing weight and maintenance.

Answer

It allows the engine oil to reach operating temperature more quickly.

Question 2

A technician is performing an internal timing check on a magneto. The E-gap is defined as the point where the:

Accepted Answer

breaker points begin to open, a few degrees of rotation past the magnetic neutral position.

Answer

distributor rotor is perfectly aligned with a contact.

Answer

magnet is at its full register or strongest position.

Answer

breaker points are at their maximum opening.

Question 3

During an engine overhaul, a mechanic installs new piston rings but aligns the gaps of all rings on one side of the piston. What is the most likely consequence if the engine is operated this way?

Accepted Answer

Significant loss of compression and engine power due to blow-by.

Answer

Excessive oil consumption and fouling of the bottom spark plugs.

Answer

Increased cylinder wall lubrication, leading to longer engine life.

Answer

The piston rings will overheat and seize in their grooves.

Question 4

Which of the following best describes the primary function of the baffles and flexible seals within the cowling of an air-cooled aircraft engine?

Accepted Answer

To direct the flow of cooling air tightly against the cylinder cooling fins.

Answer

To reduce engine noise and vibration felt in the cockpit.

Answer

To create aerodynamic lift over the engine nacelle.

Answer

To act as a firewall by preventing oil from contacting hot exhaust components.

Question 5

A pilot flying an aircraft with a float-type carburetor experiences a gradual loss of RPM and engine roughness. The outside air temperature is 60°F (15°C) with high humidity. What is the most probable cause of this issue?

Accepted Answer

Carburetor icing restricting airflow to the engine.

Answer

Vapor lock in the fuel lines from excessive heat.

Answer

Detonation due to an overly lean mixture.

Answer

Spark plug fouling from excessive carbon buildup.

Question 6

In a normally aspirated reciprocating engine, what is the primary factor that causes a decrease in volumetric efficiency as the aircraft climbs to a higher altitude?

Accepted Answer

A decrease in the density of the ambient air.

Answer

An increase in exhaust back pressure.

Answer

A reduction in the engine's ignition timing advance.

Answer

The congealing of engine oil in colder temperatures.