SPC Aircraft Systems and Performance 2

Question 1

What is the purpose of the aircraft's primer system?

Accepted Answer

To inject fuel directly into the cylinders for easier cold-weather starting

Answer

The primer pumps fuel directly into the cylinders or intake manifold to enrich the mixture for cold engine starting.

Question 2

At what altitude does a normally aspirated engine lose approximately 3% of its power for every 1,000 feet gained?

Accepted Answer

From sea level upward

Answer

A normally aspirated engine loses roughly 3% of its rated power for each 1,000 feet of altitude gain starting from sea level.

Question 3

What does the VSO airspeed indicate on the airspeed indicator?

Accepted Answer

Stalling speed in the landing configuration

Answer

VSO is the stalling speed or minimum steady flight speed in the landing configuration (gear down, flaps fully extended).

Question 4

Which fuel system component prevents vapor lock by maintaining positive fuel pressure to the carburetor?

Accepted Answer

Electric boost pump

Answer

An electric boost pump maintains fuel pressure and helps prevent vapor lock, especially during hot-weather operations.

Question 5

What happens to density altitude on a hot, humid day at a given field elevation?

Accepted Answer

Density altitude increases above field elevation

Answer

High temperature and high humidity both reduce air density, causing density altitude to rise above the actual field elevation.

(SPC) Student Pilot Certificate Practice Test