PPL PPL Aircraft Systems and Powerplant 2

Question 1

What does manifold pressure (MAP) indicate in a piston aircraft?

Accepted Answer

The absolute pressure in the engine intake manifold, used to set power

Answer

Fuel pressure in the fuel lines

Answer

Oil pressure at the engine

Answer

Barometric pressure at cruise altitude

Question 2

What happens to a normally-aspirated engine's power output as altitude increases?

Accepted Answer

Power decreases because lower air density reduces the mass of air entering the engine

Answer

Power increases due to reduced aerodynamic drag

Answer

Power stays constant up to the service ceiling

Answer

Power increases until the critical altitude

Question 3

What is the purpose of the mixture control in a piston aircraft?

Accepted Answer

To adjust the fuel-to-air ratio to maintain proper combustion as altitude and air density change

Answer

To control engine RPM

Answer

To activate carburetor heat

Answer

To control throttle position at cruise

Question 4

What color arc on the tachometer indicates the normal continuous operating range?

Accepted Answer

Green arc

Answer

Red arc

Answer

Yellow arc

Answer

White arc

Question 5

What is the purpose of the alternator on a modern piston aircraft?

Accepted Answer

To continuously charge the battery and supply electrical power during flight

Answer

To start the engine

Answer

To power the magneto ignition system

Answer

To cool the engine at high power settings

Question 6

What does a high Cylinder Head Temperature (CHT) reading above the red line indicate?

Accepted Answer

Potential engine damage from overheating requiring immediate action

Answer

Normal cruise power setting

Answer

Lean mixture condition only

Answer

Low oil pressure condition