For Question 71 select "B", "C" or "D" ("A" is selected only as an example)!
71. If the pitot tube and outside static vents become clogged, which instruments would be affected?
A) None. B) The altimeter, airspeed indicator, and turn-and-slip indicator. C) The altimeter, airspeed indicator, and vertical speed indicator. D) The altimeter, attitude indicator, and turn-and-slip indicator.
72. The presence of carburetor ice in an aircraft equipped with a fixed-pitch propeller can be verified by applying carburetor heat and noting:
A) an increase in RPM and then a gradual decrease in RPM. B) a decrease in RPM and then a constant RPM indication. C) a decrease in RPM and then a gradual increase in RPM. D) All of the above.
73. With regard 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) susceptible to icing only when visible moisture is present. D) None of the above.
74. 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. D) All of the above.
75. 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 in the throat of a venturi causing an increase in air pressure. D) None of the above.
76. While cruising at 9,500 feet MSL, the fuel/air mixture is properly adjusted. What will occur if a descent to 4,500 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, and the excess fuel will absorb heat and cool the engine. C) The excessively rich mixture will create higher cylinder head temperatures and may cause detonation. D) All of the above.
77. Generally speaking, the use of carburetor heat tends to:
A) decrease engine performance. B) increase engine performance. C) have no effect on engine performance. D) None of the above.
78. If an aircraft is equipped with a fixed-pitch propeller and a float-type carburetor, the first indication of carburetor ice would most likely be:
A) a drop in oil temperature and cylinder head temperature. B) engine roughness. C) loss of RPM. D) All of the above.
79. Applying carburetor heat will:
A) result in more air going through the carburetor. B) enrich the fuel/air mixture. C) not affect the fuel/air mixture. D) None of the above.
80. 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. D) All of the above.