61 H933 PVT During flight, when are the indications of a magnetic compass accurate? A) Only in straight-and-level unaccelerated flight. B) As long as the airspeed is constant. C) During turns if the bank does not exceed 18�‹. 62 H933 PVT In the Northern Hemisphere, the magnetic compass will normally indicate a turn toward the south when A) a left turn is entered from an east heading. B) a right turn is entered from a west heading. C) the aircraft is decelerated while on a west heading. 63 H932 PVT (Refer to figure 5.) A turn coordinator provides an indication of the A) movement of the aircraft about the yaw and roll axis. B) angle of bank up to but not exceeding 30�‹. C) attitude of the aircraft with reference to the longitudinal axis. 64 H931 PVT If the pitot tube and outside static vents become clogged, which instruments would be affected? A) The altimeter, airspeed indicator, and turn-and-slip indicator. B) The altimeter, airspeed indicator, and vertical speed indicator. C) The altimeter, attitude indicator, and turn-and-slip indicator. 65 H928 PVT 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. 66 H927 PVT 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. 67 H927 PVT 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 �‹F and low humidity. C) Temperature between 20 and 70 �‹F and high humidity. 68 H927 PVT 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. 69 H927 PVT 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. 70 H927 PVT Generally speaking, the use of carburetor heat tends to A) decrease engine performance. B) increase engine performance. C) have no effect on engine performance. 71 H927 PVT 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. 72 H927 PVT 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. 73 H928 PVT On aircraft equipped with fuel pumps, when is the auxiliary electric driven pump used? A) All the time to aid the engine-driven fuel pump. B) In the event engine-driven fuel pump fails. C) Constantly except in starting the engine. 74 H515 PVT Should it become necessary to handprop an airplane engine, it is extremely important that a competent pilot A) call 'contact' before touching the propeller. B) be at the controls in the cockpit. C) be in the cockpit and call out all commands. 75 H928 PVT If the grade of fuel used in an 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) lower cylinder head temperatures. C) detonation. 76 H928 PVT One purpose of the dual ignition system on an aircraft engine is to provide for A) improved engine performance. B) uniform heat distribution. C) balanced cylinder head pressure. 77 H928 PVT 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 in advance of normal ignition. C) the unburned charge in the cylinders explodes instead of burning normally. 78 H928 PVT If a pilot suspects that the engine (with a fixed-pitch propeller) is detonating during climb-out after takeoff, the initial corrective action to take would be to A) lean the mixture. B) lower the nose slightly to increase airspeed. C) apply carburetor heat. 79 H928 PVT The uncontrolled firing of the fuel/air charge in advance of normal spark ignition is known as A) combustion. B) pre-ignition. C) detonation. 80 H928 PVT 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.

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