NIFE Aero ACTUAL UPDATED Exam
Questions and CORRECT Answers
airfoil - CORRECT ANSWER - A streamlined shape designed to produce lift as it moves
through the air
angle of attack (AOA α) - CORRECT ANSWER - the angle formed between the relative
wind and the chord line of the airfoil
angle of incidence - CORRECT ANSWER - the angle between the airplane's longitudinal
axis and the chordline of its wing. The root chord is commonly chosen to measure this
average chord (c) - CORRECT ANSWER - the geometric average of every chord from the
wing root to the wingtip. Also called mean geometric chord.
Bernoulli's Equation - CORRECT ANSWER - Pₜ = Pₛ + q
In aerodynamics, a law or theorem stating that in a flow of incompressible fluid, the sum of the
static pressure and the dynamic pressure along a streamline is constant if gravity and frictional
effects are disregarded.
boundary layer - CORRECT ANSWER - the layer of airflow over the surface of an airfoil,
which shows local airflow retardation caused by viscosity. The boundary layer is very thin at the
leading edge of an airfoil (about 1mm) and grows in thickness as it moves over a body. It is
composed of laminar flow and turbulent flow.
calibrated airspeed (CAS) - CORRECT ANSWER - Indicated airspeed corrected for
instrument error
camber - CORRECT ANSWER - the curvature of the mean line of airfoil fro leading edfe
to trailing edge; the amount of this curvature.
,center of gravity (CG) - CORRECT ANSWER - the point at which the weight of an object
is considered to be concentrated
chord - CORRECT ANSWER - a measure of the chord line from the leading edge to the
trailing edge of an airfoil. The chord may vary in length from the wingtip to wing root. The root
chord 𝒸R, is the chord at the wing centerline and the tip chord, 𝒸T, is measured at the wingtip.
Coefficient of drag (Cd) - CORRECT ANSWER - the dimensionless portion of the total
lift on an airfoil that is dependent on the same variables that affect Cf
coefficient of lift (CL) - CORRECT ANSWER - the dimensionless portion of the total lift
on an airfoil that is dependent on the same variables that affect Cf
continuity equation - CORRECT ANSWER - ρ1A1V1=ρ2A2V2. Principle of physics that
states that for fluids, the mass flow rate has the same value at every position along a closed tube.
critical attitude - CORRECT ANSWER - the maximum altitude at which, in the standard
atmosphere, an engine produces its sea level rated horsepower or torque.
downwash - CORRECT ANSWER - chordwise airflow from the upper surface of airfoil
passing downward behind the trailing edge to the lower surface. Downwash decreases the
amount of lift produced by the wing. Any downward moving airflow.
equivalent airspeed (EAS) - CORRECT ANSWER - the true airspeed at sea level on
standard day that produces the same dynamic pressure as the actual aircraft condition. It is equal
to calibrated airspeed corrected for compressibility of air.
General Gas Law - CORRECT ANSWER - P=ρRT. Law of physics that shows the
relationship between properties of air: pressure (P), density (ρ), and temperature (T). R is a
constant for any given mixture of gases (such as dry air).
, ground effect - CORRECT ANSWER - the dramatic reduction of induced drag and thrust
required that occurs within one wingspan of the ground or other surface.
Indicated airspeed (IAS) - CORRECT ANSWER - The instrument indication for the
amount of dynamic pressure that the aircraft is creating during some given flight condition.
Indicated airspeed is displayed in knots, abbreviated KIAS.
induced drag (Di) - CORRECT ANSWER - That portion of total drag resulting from
production of lift.
laminar flow - CORRECT ANSWER - the portion of the boundary layer airflow that is
smooth and unbroken and travels along well defined streamlines
parasite drag (Dp) - CORRECT ANSWER - All drag not associated with the production of
lift.
positive camber airfoil - CORRECT ANSWER - An airfoil in which the mean camber line
is above the chordline.
potential energy (PE) - CORRECT ANSWER - the ability of a body to do work because of
its position or physical state
power (P) - CORRECT ANSWER - the rate of doing work, or work per unit time,
measured in ft-lbs/sec or horsepower
power control lever (PCL) - CORRECT ANSWER - control on a propeller driven airplane
or helicopter, that adjusts the fuel flow and therefore the power output of the engine(s). Similar
to the throttle on a jet aircraft.
power required (Pr) - CORRECT ANSWER - The power required to produce enough
thrust to overcome drag in level equilibrium flight.
Questions and CORRECT Answers
airfoil - CORRECT ANSWER - A streamlined shape designed to produce lift as it moves
through the air
angle of attack (AOA α) - CORRECT ANSWER - the angle formed between the relative
wind and the chord line of the airfoil
angle of incidence - CORRECT ANSWER - the angle between the airplane's longitudinal
axis and the chordline of its wing. The root chord is commonly chosen to measure this
average chord (c) - CORRECT ANSWER - the geometric average of every chord from the
wing root to the wingtip. Also called mean geometric chord.
Bernoulli's Equation - CORRECT ANSWER - Pₜ = Pₛ + q
In aerodynamics, a law or theorem stating that in a flow of incompressible fluid, the sum of the
static pressure and the dynamic pressure along a streamline is constant if gravity and frictional
effects are disregarded.
boundary layer - CORRECT ANSWER - the layer of airflow over the surface of an airfoil,
which shows local airflow retardation caused by viscosity. The boundary layer is very thin at the
leading edge of an airfoil (about 1mm) and grows in thickness as it moves over a body. It is
composed of laminar flow and turbulent flow.
calibrated airspeed (CAS) - CORRECT ANSWER - Indicated airspeed corrected for
instrument error
camber - CORRECT ANSWER - the curvature of the mean line of airfoil fro leading edfe
to trailing edge; the amount of this curvature.
,center of gravity (CG) - CORRECT ANSWER - the point at which the weight of an object
is considered to be concentrated
chord - CORRECT ANSWER - a measure of the chord line from the leading edge to the
trailing edge of an airfoil. The chord may vary in length from the wingtip to wing root. The root
chord 𝒸R, is the chord at the wing centerline and the tip chord, 𝒸T, is measured at the wingtip.
Coefficient of drag (Cd) - CORRECT ANSWER - the dimensionless portion of the total
lift on an airfoil that is dependent on the same variables that affect Cf
coefficient of lift (CL) - CORRECT ANSWER - the dimensionless portion of the total lift
on an airfoil that is dependent on the same variables that affect Cf
continuity equation - CORRECT ANSWER - ρ1A1V1=ρ2A2V2. Principle of physics that
states that for fluids, the mass flow rate has the same value at every position along a closed tube.
critical attitude - CORRECT ANSWER - the maximum altitude at which, in the standard
atmosphere, an engine produces its sea level rated horsepower or torque.
downwash - CORRECT ANSWER - chordwise airflow from the upper surface of airfoil
passing downward behind the trailing edge to the lower surface. Downwash decreases the
amount of lift produced by the wing. Any downward moving airflow.
equivalent airspeed (EAS) - CORRECT ANSWER - the true airspeed at sea level on
standard day that produces the same dynamic pressure as the actual aircraft condition. It is equal
to calibrated airspeed corrected for compressibility of air.
General Gas Law - CORRECT ANSWER - P=ρRT. Law of physics that shows the
relationship between properties of air: pressure (P), density (ρ), and temperature (T). R is a
constant for any given mixture of gases (such as dry air).
, ground effect - CORRECT ANSWER - the dramatic reduction of induced drag and thrust
required that occurs within one wingspan of the ground or other surface.
Indicated airspeed (IAS) - CORRECT ANSWER - The instrument indication for the
amount of dynamic pressure that the aircraft is creating during some given flight condition.
Indicated airspeed is displayed in knots, abbreviated KIAS.
induced drag (Di) - CORRECT ANSWER - That portion of total drag resulting from
production of lift.
laminar flow - CORRECT ANSWER - the portion of the boundary layer airflow that is
smooth and unbroken and travels along well defined streamlines
parasite drag (Dp) - CORRECT ANSWER - All drag not associated with the production of
lift.
positive camber airfoil - CORRECT ANSWER - An airfoil in which the mean camber line
is above the chordline.
potential energy (PE) - CORRECT ANSWER - the ability of a body to do work because of
its position or physical state
power (P) - CORRECT ANSWER - the rate of doing work, or work per unit time,
measured in ft-lbs/sec or horsepower
power control lever (PCL) - CORRECT ANSWER - control on a propeller driven airplane
or helicopter, that adjusts the fuel flow and therefore the power output of the engine(s). Similar
to the throttle on a jet aircraft.
power required (Pr) - CORRECT ANSWER - The power required to produce enough
thrust to overcome drag in level equilibrium flight.
