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AGI Practice Test Mistakes
Terms in this set (19)
Which statement describes the relationship of the forces acting on an aircraft in a constant-power and constant-airspeed descent?
Thrust is equal to drag; lift is equal to weight
When the nose of an aircraft pitches down, the angle of attack decreases and the lift produced by the wing is momentarily reduced. This imbalance between lift and weight causes the airplane to start a descending flight path with respect to the horizontal. The opposing forces are equal to each other during a steady climb, descent, or straight-and-level flight: thrust is equal to drag; lift is equal to weight.
The resistance, or skin friction, due to the viscosity of the air as it passes along the surface of a wing is called?
Profile drag is the resistance, or skin friction, due to viscosity (stickiness) of the air as it passes along the surface of the wing.
Rotor blade rotation during powered flight in a gyroplane is produced by the?
horizontal component of rotor lift
Rotation of the blades of a gyroplane rotor is produced by the horizontal component of the rotor lift.
As each blade flaps up and down, it produces a shift of the center of its mass. When the blade flaps up, the CG moves closer to its axis of rotation, giving that blade a tendency to?
accelerate its rotational velocity; this tendency is known as Coriolis effect
As the blades of a helicopter rotor flap upward, the center of mass of the blades shifts in closer to their center of rotation, and the blades try to speed up. This is called the Coriolis effect.
Rotor torque is a concern in gyroplanes only during?
Prerotation or clutch engagement
If you use too much pressure when first engaging the pre-rotator, it will cause chattering at the head and undue stress and wear on the system.
An airship will float in the air when buoyant force...
equals the difference between airship weight and the weight of the volume of air being displaced.
A lighter-than-air aircraft is in equilibrium when buoyancy equals weight. The buoyant force is equal to the weight of the air volume displaced.
A typical two-cycle engine ignition coil is powered by?
The magneto is an engine-driven generator which powers the ignition system and also supplies extra power to the aircraft's electrical system.
What is the main reason fuel tank vents must be open? To allow...
proper air pressure within the tanks for maintaining a steady fuel flow.
Fuel tanks must be vented to the atmosphere to allow for proper air pressure above the fuel at all times. If a tank vent becomes plugged, the flow of fuel to the engine can be restricted or stopped entirely.
(Refer to Figure 39.) Determine the maximum weight allowable for a pilot and passengers for a balloon flight at approximately 2,000 feet with a standard temperature. Launch with 20 gallons of propane.
1. Empty weight = 335 pounds. (Include 20 gallons of propane or 20 x 4.2 pounds per gallon or 84 pounds.)
2. Weight of balloon and fuel = 419 pounds.
3. Along the standard temperature line find 2,000 feet. Follow this line to the gross weight scale = 1,120 pounds.
4. Subtract balloon/fuel weight (419 pounds) from gross weight (1,120), 1,120 - 419 = 701 pounds.
The most favorable combination of conditions for rotorcraft performance is?
low density altitude, low gross weight, and moderate to strong wind
The most favorable conditions for rotorcraft performance are the combination of low density altitude, light gross weight, and moderate to strong wind. Low density altitude increases both the performance of the engine and the lift produced by the rotors. The low gross weight allows the helicopter to operate with less than maximum performance, and a moderate to strong wind allows the helicopter to obtain translational lift with a minimum ground speed.
When soaring in the vicinity of mountain ranges, the greatest potential danger from vertical and rotor-type currents will usually be encountered on the?
leeward side when flying into the wind
The greatest potential danger from vertical and rotor-type currents in the vicinity of mountain ranges is usually encountered beneath the wave crests on the leeward side at or below mountain-top levels. This turbulence will generally be encountered as you are flying into the wind, attempting to climb over the area of lift.
Select the true statement concerning thermals.
Strong thermals have proportionately increased sink in the air between them.
Cool air must sink to force the warm air upward in thermals. Therefore, in small-scale convection, thermals and downdrafts coexist side by side. The net upward displacement of the air must equal the net downward displacement. Strong thermals have proportionately increased sink in the air between them.
Convective circulation patterns associated with sea breezes are caused by...
land absorbing and radiating heat faster than the water
Convective circulation patterns associated with sea breezes are caused by the land absorbing and radiating heat faster than the water. The land is heated on warm, sunny days, and sea breezes usually begin during the early forenoon, reach a maximum during the afternoon, and subside around dusk after the land has cooled.
(Refer to Figure 40.) The line from point A to point B of the wind triangle represents?
true heading and airspeed
The line A to B of the wind triangle represents true heading and the true airspeed. It is the vector sum of the lines C to B (the true course and ground speed) and C to A (the wind direction and speed).
When operating under VFR at more than 3,000 feet AGL, cruising altitudes to be maintained are based upon the?
magnetic course being flown
Cruising altitudes to be used when operating VFR above 3,000 feet AGL are based on the magnetic course being flown.
A person seeking a private pilot glider rating is exempt from taking the knowledge test if that person?
holds a rating for powered aircraft
The holder of a category rating for powered aircraft is not required to take an FAA knowledge test for the addition of a glider category rating on his/her pilot certificate.
When beginning a rectangular course, the determining factor in deciding the distance from the field boundary at which an aircraft should be flown is the?
steepness of the bank desired in the turns
For best results when planning a rectangular course, the flight path should be positioned outside the field boundaries just far enough that they may be easily observed from either pilot seat by looking out the side of the aircraft. The closer the track of the aircraft is to the field boundaries, the steeper the bank necessary at the turning points.
The indicated lift-off airspeed for short-field takeoffs in a particular aircraft will normally be?
greater than for soft- or rough-field takeoffs
For a soft- or rough-field takeoff, the aircraft is lifted off at as low an airspeed as is possible, and immediately after lift-off, the nose is lowered to pick up speed before leaving ground effect. The lift-off speed for a short-field takeoff is greater than that used for a soft- or rough-field takeoff.
If complete power failure occurs while at cruising altitude, the collective pitch should be lowered, as necessary, to?
reduce the pitch on all main rotor blades so that proper rotor RPM can be maintained
By immediately lowering collective pitch (which must be done in case of engine failure), lift and drag will be reduced and the helicopter will begin an immediate descent thus producing an upward flow of air through the rotor system.
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