AT 144 Lesson 4

Proper leaning will result in greater engine efficiency and less spark plus contamination.

True

If an engine continues to run after the ignition switch is turned off, the probable cause may be:

a mag ground wire is broken and gone is hot and may start if the propeller is turned

The basic purpose of adjusting the fuel/air mixture control at altitude is to

decrease fuel flow at altitude in mixture to compensate for decrease in air density

While flying you have carburetor ice. After applying carburetor heat you should expect a

drop in RPM decrease in air density followed by an increase

Aircraft engines need battery power to produce spark? t/f

false

Preignition often leads to detonation, is caused by hot spots in the cylinder or too rich of a mixture, and is corrected by learning the mixture. t/f

false

what is the definition of detonation

fuel and air mixture ignites all at once explosions instead of burning

What are the four strokes of the internal combustion engine?

intake compression power exhaust

The practice of running a fuel tank dry before switching tanks is considered unwise because

it can cause vapor lock puts air into the fuel lines

During the sunup at high-elevation airport a pilot notes a slight engine roughness that is not affected by the magneto check, but grows worse during the carburetor heat check. Under the circumstances, which of the following would be the most logical initial action?

lean the mixture

If the engine oil temperature and cylinder head temperature gauges have exceeded their normal operating range, the pilot may have been

leaning too much too high power setting running engine too hot slow to raise in winter cowl flaps not open

What is the ammeter?

measures charge measures flow of electricity measures "load on system"

The uncontrolled firing of the fuel/air charge in advance of normal spark ignition is known as:

preignition

If the battery is 12 volts, the alternator will produce ____ units.

14

Carburetor ice can be expected at what temperature and relative humidity ranges?

Lose 2o degrees venturi, 40 degrees evaporation 20-90 degrees F, rel hum above 50%

While making a mag check during the runup we are checking

to assure the mags are working properly and that the max drop is within 50 rpm of eachother