Bernouli's Principal Flashcards
Bernoulli’s principal is best described using
which effect?
a. Coriolis effect.
b. Venturi effect.
c. Neither a nor b
b. Venturi effect.
Concerning the Venturi effect, as the crosssectional area of a tube is reduced, the
velocity of the airflow through the tube
must–
a. Decrease
b. Increase
c. Remain the same
b. Increase
As the velocity of the air moving through a
venturi increases–
a. Static pressure decreases
b. Static pressure increses
c. Static pressure is difficult to measure and therefore an increase or decrease is considered neglible
a. Static pressure decreases
Static pressure is defined as–
a. Compressed air containing positively
charged ions.
b. The atmospheric pressure of the air through which an airplane is flying.
c. The pressure
b. The atmospheric pressure of the air through which an airplane is flying.
Dynamic pressure is defined as–
a. Compressed air containing positively
charged ions.
b. The atmospheric pressure of the air through which the airplane is moving.
c. The pressure of a fluid resulting from its motion.
d. None of the above.
c. The pressure of a fluid resulting from its motion.
Relative wind is–
a. The air in motion that is equal and opposite the flight path velocity of the airfoil.
b. The angle measured between the resultant relative wind and the chord.
c. The angle between the airfoil chord line and
the longitudinal axis of the airplane.
d. None of the above.
a. The air in motion that is equal and opposite the flight path velocity of the airfoil.
Angle of Attack is the angle measured between the resultant relative wind and the chord
a. True
b. False
a. True
Center of Pressure is defined as:
a. The point along the mean camber line where all aerodynamic forces are considered to act.
b. The point along the chord line of an airfoil through which lift is considered to act.
c. The point along the chord line on an airfoil through which all aerodynamic forces are considered to act.
c. The point along the chord line on an airfoil through which all aerodynamic forces are considered to act.
Aerodynamic center is the point along the chord line of an airfoil through which all aerodynamic forces are considered to act.
a. True
b. False
a. True
Lift is defined as–
a. the component of the total aerodynamic
force that acts at right angles to drag.
b. the component of the total aerodynamic force that acts at right angles to the RRW.
c. Neither a nor b are true.
b. the component of the total aerodynamic force that acts at right angles to the RRW.
The two factors that most affect the
coefficient of lift and the coefficient of drag
are:
a. weight & balance
b. thrust & air density
c. shape of the airfoil & angle of attack
c. shape of the airfoil & angle of attack
Drag that is produced by non-lifting
portions of the airframe.
a. Form Drag
b. Parasitic Friction Drag
c. Parasitic Drag
c. Parasitic Drag
The portion of drag that is generated because of the shape of the airplane.
a. Form Drag
b. Skin Friction Drag
c. Parasitic Form
a. Form Drag
The boundary layer air creates lstagnant layer of air molecules.
a. Parasitic Drag
b. Skin-Friction Drag
c. Interference Drag
b. Skin-Friction Drag
Created by the collision of airstreams. Causes eddy currents, restrictions, and turbulence to smooth flow.
a. Parasitic Drag
b. Skin-Friction Drag
c. Interference Drag
c. Interference Drag