PPL PPL Aircraft Systems and Powerplant

Question 1

What type of fuel is used in most piston-engine training aircraft?

Accepted Answer

100LL Avgas

Answer

Most piston-engine training aircraft use 100LL (low lead) aviation gasoline, identifiable by its blue color.

Question 2

What does the carburetor heat control do in a piston aircraft?

Accepted Answer

Routes warm air through the carburetor to prevent or melt ice

Answer

Carburetor heat routes warm air into the carburetor venturi to melt or prevent ice formation that would otherwise block fuel-air flow.

Question 3

What is the primary purpose of the magneto system in a piston engine?

Accepted Answer

To provide an independent ignition source not relying on the aircraft battery

Answer

Magnetos are self-contained ignition systems that generate their own electricity, providing reliable ignition independent of the battery.

Question 4

In a fuel-injected engine, what replaces the carburetor?

Accepted Answer

A fuel control unit and injectors delivering fuel directly to each cylinder

Answer

Fuel-injected engines use a fuel control unit and individual injectors to deliver metered fuel directly to each cylinder, eliminating the carburetor.

Question 5

What does normal oil pressure indicate in a piston aircraft engine?

Accepted Answer

Oil is circulating through the engine to lubricate and cool internal parts

Answer

Oil pressure confirms the oil pump is functioning and lubricant is being circulated throughout the engine to reduce friction and carry heat away.

(PPL) Private Pilot Licence Practice Test