Aviation Unit 3 Test.

Which of the following are factors that affect air density? Select all that apply. A, Humidity B, Pressure C, Viscosity D, Friction E, Temperature

A, Humidity. B, Pressure. E, Temperature.

True or False. Water has greater viscosity than air. A, True B, False

A, True.

The "standard day" serves as a universal baseline for measuring _______. A, atmospheric pressure B, barometric temperature C, density altitude D, ground roll

A, atmospheric pressure

What is the trailing edge? A, is where the airflow separated by the leading edge rejoins. B, is the part of the wing that first contacts the air C, the curvature of the lower surface of an airfoil. D, a line connecting the leading and trailing edges of an airfoil E, the curvature of the upper surface of an airfoil. F, the angle between the chord line and the relative wind

A, is where the airflow separated by the leading edge rejoins.

Which if the following is a good formula for calculating the density of a substance? A, D = W X M B, D = M / V C, D = V / W D, D = V X W E, D = M X V

B, D = M / V

True or False the relative Humidity makes a bigger difference in the performance of an airplane than the Pressure in the atmosphere surrounding the airplane. A, True B, False

B, False

Which formula is used for calculating density altitude? A, mass ÷ volume B, PA + [120 (OAT ‒ ISA)] C, (29.92 - Barometric Pressure) 1,000 + Elevation D, 15 - (2 ÷ 1,000 x PA)

B, PA + [120 (OAT ‒ ISA)

Airplanes need sufficient air to .... Select all that apply. A, Create Drag B, Produce Lift C, Increase Weight D, Produce Thrust E, Run the Engine

B, Produce Lift. D, Produce Thrust. E, Run the Engine.

When an object moves through a fluid, which of the following will affect fluid friction? Select all that apply. A, The fluid's color B, The fluid's viscosity C, The speed of the object D, The object's density E, The shape of the object

B, The fluid's viscosity. C, The speed of the object. E, The shape of the object.

An airfoil's movement through air is similar to _______. A, a moving freight train B, a boat's movement on water C, a beam of light D, electron flow through a wire

B, a boat's movement on water

Millibars (mb) is a unit of measurement for _______ . A, air temperature B, atmospheric pressure C, density D, fluid friction

B, atmospheric pressure

Atmospheric pressure is _______ to air density. A, equal to B, directly proportional C, inversely proportional D, unrelated

B, directly proportional

What is the Leading Edge? A, is where the airflow separated by the leading edge rejoins. B, is the part of the wing that first contacts the air C, the curvature of the lower surface of an airfoil. D, a line connecting the leading and trailing edges of an airfoil E, the curvature of the upper surface of an airfoil. F, the angle between the chord line and the relative wind.

B, is the part of the wing that first contacts the air

_______ decreases at 1''Hg per 1,000 foot increase in altitude. A, Barometric pressure B, Density pressure C, True altitude D, Measured pressure altitude

Barometric Pressure

Viscosity is a fluid's resistance to _______. A, friction B, light C, flow D, heat

C, Flow

Which statement is true about an object moving through a fluid? A, Viscosity changes according to the size of the object. B, The object moves faster if the fluid is more viscous. C, Fluid friction increases as the object's velocity increases. D, Less viscosity means more fluid friction.

C, Fluid friction increases as the object's velocity increases.

Which combination of atmospheric conditions will reduce takeoff and climb performance? A, Low temperature, low relative humidity, and low density altitude B, High temperature, low relative humidity, and low density altitude C, High temperature, high relative humidity, and high density altitude D, Low temperature, high relative humidity, and high density altitude

C, High temperature, high relative humidity, and high density altitude

The Coanda Effect is the tendency of a stream of fluid to _______ . A, avoid a moving object B, move below an airplane's wing C, attach to a convex surface D, go around a wing or rotor

C, attach to a convex surface

Pressure altitude corrects for the difference between _______ and standard pressure. A, humidity B, density altitude C, barometric pressure D, standard temperature

C, barometric pressure

What is the Lower Cambarge. A, is where the airflow separated by the leading edge rejoins. B, is the part of the wing that first contacts the air C, the curvature of the lower surface of an airfoil. D, a line connecting the leading and trailing edges of an airfoil E, the curvature of the upper surface of an airfoil. F, the angle between the chord line and the relative wind

C, the curvature of the lower surface of an airfoil.

The standard lapse rate is A, 2F per and 1" Hg per 1000 feet B, 2C per and 1" Hg per 100 feet C, 2F per and 2" Hg per 1000 feet D, 2C per and 1" Hg per 1000 feet E, 2F per and 1" Hg per 100 feet

D, 2C per and 1" Hg per 1000 feet

The Magnus Effect occurs because __________ drags the air around it. A, a moving object B, an airplane's wing C, a convex surface D, spinning object E, a rotor

D, Spinning Object

What is the Cord Line? A, is where the airflow separated by the leading edge rejoins. B, is the part of the wing that first contacts the air C, the curvature of the lower surface of an airfoil. D, a line connecting the leading and trailing edges of an airfoil E, the curvature of the upper surface of an airfoil. F, the angle between the chord line and the relative wind

D, a line connecting the leading and trailing edges of an airfoil.

Density Altitude is _________ corrected for non-standard temperature. A, atmospheric pressure B, atmospheric temperature C, density altitude D, pressure altitude E, barometric temperature

D, pressure altitude

What are the standard temperature and pressure values for sea level? A, 59 degrees C and 1013.2 millibars B, 15 degrees F and 29.92" Hg. C, 59 degrees C and 29.92" Hg. D, 0 degrees C and 1013.2 millibars E, 15 degrees C and 29.92" Hg.

E, 15 degrees C and "29.92" Hg.

What is the Upper Cambarge? A, is where the airflow separated by the leading edge rejoins. B, is the part of the wing that first contacts the air C, the curvature of the lower surface of an airfoil. D, a line connecting the leading and trailing edges of an airfoil E, the curvature of the upper surface of an airfoil. F, the angle between the chord line and the relative wind

E, the curvature of the upper surface of an airfoil.

What is the Angle of Attack? A, is where the airflow separated by the leading edge rejoins. B, is the part of the wing that first contacts the air C, the curvature of the lower surface of an airfoil. D, a line connecting the leading and trailing edges of an airfoil E, the curvature of the upper surface of an airfoil. F, the angle between the chord line and the relative wind

F, the angle between the chord line and the relative wind.

Which factor would tend to increase the density altitude at a given airport? A, decrease in ambient temperature B, increase in barometric pressure C, decrease in relative humidity D, increase in ambient temperature

Increase in ambient temperature.