NIFE Aerodynamic Definitions Test Terms with Correct
Answers | Verified
What forces act on an aircraft in flight?
a) Lift and drag
b) Lift and thrust
c) Lift, drag and thrust
d) Lift, drag, weight and thrust
Total pressure is comprised of what two elements?
a) Potential and dynamic
b) Potential and kinetic
c) Kinetic and dynamic
d) Dynamic and static
What is the relationship between altitude and density?
a) Independent
b) Direct
c) Inverse
"The distance between individual air particles increases with altitude, resulting in fewer
particles per unit volume. Therefore, air density decreases with an increase in altitude"
What force relationship must exist for an aircraft to maintain equilibrium flight?
a) The sum of all the forces and moments about the center of gravity must equal
zero
b) Lift must equal weight
c) Thrust must equal weight
d) Thrust must equal drag
What would increase the density of air acting on an aircraft?
a) An increase in altitude
b) An increase in air temperature
c) A decrease in altitude
d) A decrease in static pressure where temperature is constant
,"The distance between individual air particles increases with altitude, resulting in fewer
particles per unit volume. Therefore, air density decreases with an increase in altitude"
What equation expresses the General Gas Law?
a) P = ρKT
b) ρ = P/RT
c) P = ρT
d) RP = ρT
Roll is defined as the movement of the lateral axis about which axis.
a) Lateral
b) Longitudinal
c) Vertical
d) Horizon
"Movement of the lateral axis around the longitudinal axis is called roll."
The wingspan includes the area within the fuselage area?
a) True
b) False
"Wingspan (b) is the length of a wing, measured from wingtip to wingtip."
The chordline is:
a) The wings center line
b) An infinitely long straight line drawn through the leading and trailing edges of
an airfoil
c) A measure of the length of the wing
d) The average distance from the wing root to the wingtip
According to the continuity equation for incompressible airflow, what is the
relationship between area, airflow velocity and mass airflow for a streamtube?
a) Airflow velocity increases as stream tube area increases, to maintain a
constant mass airflow
b) Airflow velocity increases as stream tube area decreases, to maintain a
constant mass airflow
c) Airflow velocity remains constant as stream tube area decreases, to maintain a
constant mass airflow
d) Airflow velocity decreases as stream tube area decreases, to maintain a
constant mass airflow
equation, the velocity must increase on the same side so both sides remain equal.”
, Since a streamtube is a closed-system, mass and/or energy must be held constant
When will the value of indicated airspeed equal the aircraft's true airspeed?
a) When the static pressure at aircraft altitude is less than static pressure at sea
level
b) When the static pressure at aircraft altitude is greater than static pressure at
sea level
c) When the static pressure at aircraft altitude is equal to static pressure at sea
level
d) When air density at aircraft altitude is equal to air density at sea level, on a
standard day
"The pitot static system is calibrated for standard sea level density, so TAS will equal
IAS only under standard day, sea level conditions.", or when ρ=ρo
What airspeed, when corrected for compressibility effects, results in equivalent
airspeed?
a) Indicated airspeed
b) True airspeed
c) Ground airspeed
d) Calibrated airspeed
"Equivalent airspeed... is found by corrected calibrated airspeed for compressibility
error."
What type of correction must you apply to indicated airspeed (IAS) to calculate
true airspeed (TAS)?
a) Density correction
b) Temperature correction
c) Pressure correction
d) Viscosity correction
An aircraft is climbing at a constant 350 knots IAS. What change in TAS occurs as
altitude increases?
a) True airspeed decreases
b) True airspeed increases
c) True airspeed remains constant
d) There is no such thing as true airspeed
"If IAS remains constant while climbing from sea level to some higher altitude, TAS
must increase"
What airfoil angle of attack setting is required to produce zero net lift on a
positively cambered airfoil?
Answers | Verified
What forces act on an aircraft in flight?
a) Lift and drag
b) Lift and thrust
c) Lift, drag and thrust
d) Lift, drag, weight and thrust
Total pressure is comprised of what two elements?
a) Potential and dynamic
b) Potential and kinetic
c) Kinetic and dynamic
d) Dynamic and static
What is the relationship between altitude and density?
a) Independent
b) Direct
c) Inverse
"The distance between individual air particles increases with altitude, resulting in fewer
particles per unit volume. Therefore, air density decreases with an increase in altitude"
What force relationship must exist for an aircraft to maintain equilibrium flight?
a) The sum of all the forces and moments about the center of gravity must equal
zero
b) Lift must equal weight
c) Thrust must equal weight
d) Thrust must equal drag
What would increase the density of air acting on an aircraft?
a) An increase in altitude
b) An increase in air temperature
c) A decrease in altitude
d) A decrease in static pressure where temperature is constant
,"The distance between individual air particles increases with altitude, resulting in fewer
particles per unit volume. Therefore, air density decreases with an increase in altitude"
What equation expresses the General Gas Law?
a) P = ρKT
b) ρ = P/RT
c) P = ρT
d) RP = ρT
Roll is defined as the movement of the lateral axis about which axis.
a) Lateral
b) Longitudinal
c) Vertical
d) Horizon
"Movement of the lateral axis around the longitudinal axis is called roll."
The wingspan includes the area within the fuselage area?
a) True
b) False
"Wingspan (b) is the length of a wing, measured from wingtip to wingtip."
The chordline is:
a) The wings center line
b) An infinitely long straight line drawn through the leading and trailing edges of
an airfoil
c) A measure of the length of the wing
d) The average distance from the wing root to the wingtip
According to the continuity equation for incompressible airflow, what is the
relationship between area, airflow velocity and mass airflow for a streamtube?
a) Airflow velocity increases as stream tube area increases, to maintain a
constant mass airflow
b) Airflow velocity increases as stream tube area decreases, to maintain a
constant mass airflow
c) Airflow velocity remains constant as stream tube area decreases, to maintain a
constant mass airflow
d) Airflow velocity decreases as stream tube area decreases, to maintain a
constant mass airflow
equation, the velocity must increase on the same side so both sides remain equal.”
, Since a streamtube is a closed-system, mass and/or energy must be held constant
When will the value of indicated airspeed equal the aircraft's true airspeed?
a) When the static pressure at aircraft altitude is less than static pressure at sea
level
b) When the static pressure at aircraft altitude is greater than static pressure at
sea level
c) When the static pressure at aircraft altitude is equal to static pressure at sea
level
d) When air density at aircraft altitude is equal to air density at sea level, on a
standard day
"The pitot static system is calibrated for standard sea level density, so TAS will equal
IAS only under standard day, sea level conditions.", or when ρ=ρo
What airspeed, when corrected for compressibility effects, results in equivalent
airspeed?
a) Indicated airspeed
b) True airspeed
c) Ground airspeed
d) Calibrated airspeed
"Equivalent airspeed... is found by corrected calibrated airspeed for compressibility
error."
What type of correction must you apply to indicated airspeed (IAS) to calculate
true airspeed (TAS)?
a) Density correction
b) Temperature correction
c) Pressure correction
d) Viscosity correction
An aircraft is climbing at a constant 350 knots IAS. What change in TAS occurs as
altitude increases?
a) True airspeed decreases
b) True airspeed increases
c) True airspeed remains constant
d) There is no such thing as true airspeed
"If IAS remains constant while climbing from sea level to some higher altitude, TAS
must increase"
What airfoil angle of attack setting is required to produce zero net lift on a
positively cambered airfoil?
