筆記試験問題/解答抜粋
1. Which statement relates to Bernoulli's principle?
- A- For every action there is an equal and opposite re action.
- B- An additional upward force is generated as the lower surface of the wing deflects air downward.
- C- Air traveling faster over the curved upper surface of an airfoil causes lower pressure on the top sur face.
Bernoulli's principle states in part that the pressure of a fluid (liquid or gas) decreases at points where the speed of the fluid increases. In other words, high-speed flow is associated with low pressure, and low-speed flow with high pressure. Air traveling faster over the curved upper surface of an airfoil causes lower pressure on the top surface.
Correct answer (C)
2. The four forces acting on an airplane in flight are
- A- lift, weight, thrust, and drag.
- B- lift, weight, gravity, and thrust.
- C- lift, gravity, power, and friction.
Lift, weight, thrust, and drag are the four basic aerodynamic forces acting on an aircraft in flight. (H300)－FAA-H-8083-25, Chapter 3
Correct answer (A)
3. When landing behind a large aircraft, the pilot should avoid wake turbulence by staying
- A- above the large aircraft's final approach path and landing beyond the large aircraft's touchdown point.
- B- below the large aircraft's final approach path and landing before the large aircraft's touchdown point.
- C- above the large aircraft's final approach path and landing before the large aircraft's touchdown point.
When landing behind a large aircraft stay at or above the large aircraft's final approach path. Note its touchdown point and land beyond it. (H972)－FAA-H-8083-25, Chapter 12
Correct answer (A)
4. 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 for 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.
The mixture becomes richer as the airplane gains altitude, because the carburetor meters the same amount of fuel as at sea level. Leaning the mixture control prevents this by decreasing the rate of fuel discharge to compensate for the decrease in air density. (H307)－FAA-H-8083-25, Chapter 5
Correct answer (B)
5. 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.
Using aviation fuel of a lower rating is harmful under any circumstances because it may cause loss of power, excessive heat, burned spark plugs, burned and sticky valves, high oil consumption, and detonation. (H928)－FAA-H-8083-25, Chapter 5
Correct answer (C)
