Aircraft Systems Flashcards
What should be the first action after starting an aircraft engine?
A-adjust for proper RPM and check for desired indications on the engine gauges.
B-place the magneto or ignition switch momentarily in the OFF position to check for proper grounding.
C-test each brake and the parking brake.
A-adjust for proper RPM and check for desired indications on the engine gauges.
What is one purpose for using reciprocating engines?
A-heat is distributed better.
B-to preserve cylinder head during and maintain lower temperatures.
C-they are relatively simple and inexpensive to operate.
C-they are relatively simple and inexpensive to operate.
An electrical system failure (battery and alternator) occurs during flight. In this situation, you would:
A-experience avionics equipment failure.
B-probably experience failure of the engine igiition system, fuel gauges, aircraft lighting system, an avionics equipment.
C-probably experience engine failure due to the loss of the engine-driven fuel pump and also experience failure of the radio equipment, lights, and all instruments that require alternating current.
A-experience avionics equipment failure.
If the ground wire between the magneto and the ignition switch becomes disconnected, th most noticeable result will be that the engine:
A-will run very rough.
B-cannot be started with the switch in the ON position.
C-cannot be shut down by turning the switch to the OFF position.
C-cannot be shut down by turning the switch to the OFF position.
The operating principle of float-type carburetors is based on the:
A-automatic metering of air at the Venturi as the aircraft gains altitude.
B-difference in air pressure at the Venturi throat and the air inlet.
C-increase in air velocity at the throat of a Venturi causing an increase in air pressure.
B-difference in air pressure at the Venturi throat and the air inlet.
The basic purpose of adjusting the fuel/air mixture at altitude is to:
A-decrease the amount of fuel in the mixture in order to compensate of increased air density.
B-decrease the fuel flow in order to compensate for decreased air density.
C-increase the amount of fuel in the mixture to compensate for the decrease in pressure and density of the air.
B-decrease the fuel flow in order to compensate for decreased air density.
While cruising at 9500 feet MSL, the fuel/air mixture is properly adjusted. What will occur if a descent to 4500 feet MSL is made without readjusting the mixture?
A-the fuel/air mixture may become excessively lean.
B-there will be more fuel in the cylinders than is needed for normal combustion, an date excess fuel will absorb heat and cool the engine.
C-the excessively rich mixture will create higher cylinder head temperatures and may cause detonation.
A-the fuel/air mixture may become excessively lean.
Which condition is most favorable to the development of carburetor icing?
A-any temperature below freezing and a relative humidity of less than 50 percent.
B-temperature between 32 and 50 degrees F and low humidity.
C-temperature between 20 and 70 degrees F and high humidity.
C-temperature between 20 and 70 degrees F and high humidity.
The possibility of carburetor icing exists even when the ambient air temperature is as:
A-high as 70 degrees F and the relative humidity is high.
B-high as 95 degrees F and there is visible moisture.
C-low as 0 degrees F and the relative humidity is high.
A-high as 70 degrees F and the relative humidity is high.
Carburetor icing can occur with an OAT as high as:
A-100 degrees F and visible moisture.
B-20 degrees C and high relative humidity.
C-75 degrees F and low relative humidity.
B-20 degrees C and high relative humidity.
Applying carburetor head will:
A-result in more air going through the carburetor.
B-enrich the fuel/air mixture.
C-not affect the fuel/air mixture.
B-enrich the fuel/air mixture.
What change occurs in the fuel/air mixture when carburetor heat is applied?
A-a decrease in RPM results from the lean mixture.
b-the fuel/air mixture becomes richer.
C-the fuel/air mixture becomes leaner.
b-the fuel/air mixture becomes richer.
Generally speaking, the use of carburetor heat tends to:
A-decrease engine performance.
B-increase engine performance.
C-have no effect on engine performance.
A-decrease engine performance.
With regards to carburetor ice, float-type carburetor systems in comparison to fuel injection systems are generally considered to be:
A-more susceptible to icing.
B-equally susceptible to icing.
C-less susceptible to icing.
A-more susceptible to icing.
If the grade of fuel used the aircraft engine is lower than specified for the engine, it will most likely cause:
A-a mixture of fuel and air that is not uniform in all cylinders.
B-low cylinder head temperatures.
C-detonation.
C-detonation.
Detonation may occur at high-power settings when:
A-the fuel mixture ignites instantaneously instead o burning progressively and evenly.
B-an excessively rich fuel mixture causes an explosive gain in power.
C-the fuel mixture is ignited too early by hot carbon deposits in the cylinder.
A-the fuel mixture ignites instantaneously instead o burning progressively and evenly.
Detonation occurs in a reciprocating aircraft engine when:
A-the spark plugs are fouled or shorted out or the wiring is defective.
B-hot spots in the combustion chamber ignite the fuel/air mixture advance of normal ignition.
C-the unburned charge in the cylinders explodes instead of burning normally.
C-the unburned charge in the cylinders explodes instead of burning normally.
The uncontrolled firing of the fuel/air charge in advance of normal spark ignition is known as:
A-combution.
B-pre-igition.
C-detonation.
B-pre-igition.
What type of fuel can be substituted for an aircraft if the recommended octane is not available?
A-the next higher octane aviation gas.
B-the next lower octane aviation gas.
C-unleaded automotive gas of the same octane rating.
A-the next higher octane aviation gas.
Filling the fuel tanks after the last flight of the day is considered a good operating procedure because this will:
A-force any existing water to the top of the tank away from the fuel lines to the engine.
B-prevent expansion o fat fuel by eliminating airspace in the tanks.
C-prevent moisture condensation by eliminating airspace in the tanks.
C-prevent moisture condensation by eliminating airspace in the tanks.
To properly purge water from the fuel system of an aircraft equipped with the fuel tank sumps and a fuel strainer quick drain, it is necessary to drain fuel from the:
A-fuel strainer drain.
B-lowest point the the fuel system.
C-fuel strainer drain and the fuel tank sumps.
C-fuel strainer drain and the fuel tank sumps.
Excessively high engine temperatures will:
A-cause damage to heat-conducting hoses and warping of the cylinder cooling fins.
B-cause loss of power, excessive oil consumption, and possible permanent internal engine damage.
C-not appreciably affect an aircraft engine.
B-cause loss of power, excessive oil consumption, and possible permanent internal engine damage.
Excessively high engine temperatures, either in the air or on the ground, will:
A-increase fuel consumption and may increase power due to the increased heat.
B-result in damage to heat-conducting hoses and warping of cylinder cooling fans.
C-cause loss of power, excessive oil consumption, and possible permanent internal engine damage.
C-cause loss of power, excessive oil consumption, and possible permanent internal engine damage.
If the engine oil temperature and cylinder head temperature gauges have exceeded their normal operating range, the pilot may have been operating with:
A-the moisture set too rich.
B-higher-than-normal oil pressure.
C-too much power and with the mixture set too lean.
C-too much power and with the mixture set too lean.
Which would most likely cause the cylinder head temperature and engine oil temperature gauges to exceed their normal operating ranges?
A-using fuel that has a lower-than-specified fuel rating.
B-using fuel that has a higher-than-specified fuel rating.
C-operating with higher-than-normail oil pressure.
A-using fuel that has a lower-than-specified fuel rating.
For internal cooling, reciprocating aircraft engines are especially dependent on:
A-a properly functioning thermostat.
B-air flowing over the exhaust manifold.
C-the circulation of lubricating oil.
C-the circulation of lubricating oil.
An abnormally high engine oil temperature indication may be caused by:
A-the oil level being too low.
B-operating with a too high viscosity oil.
C-operating with an excessively rich mixture.
A-the oil level being too low.
What action can a pilot take to aid in cooling an engine that is overheating during a climb?
A-reduce rate of climb and increase airspeed.
B-reduce climb speed and increase RPM.
C-increase climb speed and increase RPM.
A-reduce rate of climb and increase airspeed.