For Question 81 select "B", "C" or "D" ("A" is selected only as an example)!
81. Excessively high engine temperatures will:
A) None of the below. B) cause damage to heat-conducting hoses and warping of the cylinder cooling fins. C) cause loss of power, excessive oil consumption, and possible permanent internal engine damage. D) not appreciable affect an aircraft engine.
82. 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. D) All of the above.
83. If the grade of fuel used in an aircraft engine is lower that 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. D) None of the above.
84. 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-drive fuel pump fails. C) Constantly except in starting the engine. D) All of the above.
85. One purpose of the dual ignition system on an aircraft engine is to provide for:
A) improved engine performance. B) uniform heat distribution. C) balance cylinder head pressure. D) None of the above.
86. 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 cyhlinders explodes instead of burning normally. D) All of the above.
87. If a pilot suspects that the engine (with a fixed-pitch propeller) is detonating dcuring 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. D) None of the above.
88. The uncontrolled firing of the fuel/air charge in advance of normal spark ignition is know as:
A) combustion. B) pre-ignition. C) detonation. D) All of the above.
89. Detonation may occur at high-power settings when:
A) the fuel mixture ignites instantaneously instead of burning progressively and evenly. B) an excessively rich mixture causes an explosive gain in power. C) the fuel mixture is ignited too early by hot carbon deposits in the cylinder. D) None of the above.
90. 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. D) All of the above.