Quiz 1 Flashcards
What axis extends lengthwise through the fuselage from the nose to the tail of an aircraft?
Longitudinal Axis
Air density is directly proportional to pressure and inversely proportional to temperature.
True
What principle explains the creation of lift due to the difference in air velocity over and under the wing?
Bernoulli’s Principle
The angle of incidence is the angle between the chord line of the wing and the direction of the relative wind.
False
Parasite drag can be Completely eliminated by streamlining the shape of the aircraft.
False
What is the angle between the chord line of the wing and the longitudinal axis of the aircraft called?
Angle of Incidence
What is the primary composition of the air in Earth’s Atmosphere?
Nitrogen and Oxygen
What is the primary purpose of trim tabs on an aircraft?
To correct any tendency of the aircraft to move toward an undesirable flight attitude
The aspect ratio is the comparison of the wingspan to the chord length, and a higher aspect ratio results in greater lift.
True
What is Velocity?
The rate of motion in a particular direction in relation to time.
Which force counteracts the effect of weight and acts vertically?
Lift
What force is responsible for moving an aircraft forward?
Thrust
Which of the following can increase lift on an aircraft wing?
Increasing the air velocity over the wing
Dynamic stability deals with the tendency of a displaced body to return to equilibrium.
False
What type of stability exist when a disturbed object tends to return to equilibrium?
Positive static stability
What is the law of conservation of energy?
Energy can neither be created nor destroyed
Which control surface is responsible for controlling the yaw of an aircraft?
Rudder
Which of the following auxiliary lift devices is primarily used to increase lift during takeoff and improve handling characteristics at low airspeeds?
Slats
Servo tabs are designed to move in the opposite direction of the primary flight control surface.
False
What surface is primarily responsible for controlling longitudinal stability in an aircraft?
Horizontal Stabilizer
Which control surface is responsible for controlling the pitch of an aircraft?
Elevators
The CG ( Center Of Gravity) of an aircraft is the point where all the weight of the aircraft is concentrated.
True
Bernoulli’s Principle states that as the speed of a fluid increases, its pressure also increases.
False
At sea level, what is the standard atmospheric pressure measured in pounds per square inch (psi)?
14.7 psi
What is the primary purpose of winglets on an aircraft?
To reduce aerodynamic drag associated with vortices at the wingtips.
Spoilers are used to increase lift and improve handling characteristics at low airspeeds.
False
How do single-main rotor helicopters counteract torque?
Tail rotor and foot pedals
What is the effect of increasing the helicopter’s speed on the rotor blades’ movement and the rotor disc’s position?
Blades flap and cause the rotor disc to tilt backwards.
What is the purpose of a freewheeling unit in a helicopter?
Allow the rotor to spin freely if the engine fails
What is the effect of gyroscopic precession on a helicopter’s main rotor?
Rotor disc tilts forward
What happens to lift when the angle of attack (AOA) of the rotor blades is increased during vertical flight?
Helicopter Ascends
During hovering flight, in which direction does a single main rotor helicopter tend to drift due to the tail rotor thrust?
In the direction of tail rotor thrust
How does a dual-rotor helicopter balance aerodynamic torque?
Two horizontal counter-rotating rotors.
What distinguishes a fully articulated rotor system from other rotor systems?
Each blade moves in three directions, pitch, lead-lag, and flap
Which force acts upward and adjusts with rotor tilt in a helicopter?
Lift
What is the primary purpose of rigging in helicopter assembly and maintenance?
Ensure the coordination and precise movement of flight controls
What happens when the collective pitch control is raised?
Pitch angle of all main rotor blades increases
What is the primary function of a stabilizer bar in a helicopter’s Bell Stabilizer Bar System?
Improve helicopter stability
How does an offset flapping hinge enhance helicopter control?
Creating powerful moments for control with greater offset
What is the primary method used for rotor blade tracking?
Using a stroboscopic light to measure blade positions
What is the purpose of the freewheeling unit in a helicopter?
Disconnect the main rotor from the engine when rotor RPM exceeds engine RPM
What is the primary function of the helicopter transmission system?
Transfer power from the engine to the rotors and other accessories
What is the purpose of Stability Augmentation Systems (SAS) in helicopters?
Stabilize helicopters and reduce pilot workload
How do anti torque pedals help control a helicopter?
Controlling the pitch and thrust of the tail rotor blades.
Which type of engine is commonly used in training helicopters due to its simplicity and cost-effectiveness?
Reciprocating Engine
What is the primary function of the awash plate assembly in a helicopter?
Transmit pilot controls to the main rotor blades
