Induction & Engine Airflow Systems Flashcards
- A method commonly used to prevent carburetor icing is to
a. preheat the intake air.
b. mix alcohol with the fuel.
c. electrically heat the venturi and throttle valve.
a.
- Carburetor icing is most severe at
a. air temperatures between 30 and 40 degrees F.
b. high altitudes.
c. low engine temperatures.
a.
- Into what part of a reciprocating engine induction system is deicing alcohol normally injected?
a. The supercharger or impeller section.
b. The airstream ahead of the carburetor.
c. The low-pressure area ahead of the throttle valve.
b.
- Carburetor icing on an engine equipped with a constant-speed propeller can be detected by
a. a decrease in power output with no change in manifold pressure or RPM.
b. an increase in manifold pressure with a constant RPM.
c. a decrease in manifold pressure with a constant RPM.
c.
- What part of an aircraft in flight will begin to accumulate ice before any other?
a. Wing leading edge.
b. Propeller spinner or dome.
c. Carburetor.
c.
- Carburetor icing may be eliminated by which of the following methods?
a. Alcohol spray and electrically heated induction duct.
b. Ethylene glycol spray and heated induction air.
c. Alcohol spray and heated induction air.
c.
- Where would a carburetor air heater be located in a fuel injection system?
a. At the air intake entrance.
b. None is required.
c. Between the air intake and the venturi.
b.
- An increase in manifold pressure when carburetor heat is applied indicates
a. ice was forming in the carburetor.
b. mixture was too lean.
c. overheating of cylinder heads.
a.
- During full power output of an unsupercharged engine equipped with a float-type carburetor, in which of the following areas will the highest pressure exist?
a. Venturi.
b. Intake manifold.
c. Carburetor air scoop.
c.
- The use of the carburetor air heater when it is not needed causes
a. a very lean mixture.
b. excessive increase in manifold pressure.
c. a decrease in power and possibly detonation.
c.
- As manifold pressure increases in a reciprocating engine, the
a. volume of air in the cylinder increases.
b. weight of the fuel/air charge decreases.
c. density of air in the cylinder increases.
c.
- Which of the following statements regarding volumetric efficiency of an engine is true?
a. The volumetric efficiency of an engine will remain the same regardless of the amount of throttle opening.
b. It is impossible to exceed 100 percent volumetric efficiency of any engine regardless of the type of supercharger used.
c. It is possible to exceed 100 percent volumetric efficiency of some engines by the use of superchargers of the proper type.
c.
- Bootstrapping of a turbocharged engine is indicated by
a. an overboost condition of the engine on takeoff.
b. a transient increase in engine power.
c. a maximum increase in manifold pressure.
b.
- Which of the following would be a factor in the failure of an engine to develop full power at takeoff?
a. Improper adjustment of carburetor heat valve control linkage.
b. Excessively rich setting on the idle mixture adjustment.
c. Failure of the economizer valve to remain closed at takeoff throttle setting.
a.
- If the turbocharger waste gate is completely closed,
a. none of the exhaust gases are directed through the turbine.
b. the turbocharger is in the OFF position.
c. all the exhaust gases are directed through the turbine.
c.
- Boost manifold pressure is generally considered to be any manifold pressure above
a. 14.7” Hg
b. 50 “ Hg
c. 30” Hg
c.