AOPA Course 2 Unit 3 Exam

What are the standard temperature and pressure values for sea level? (3.B.1)

• 15 degrees C and 29.92" Hg.

• 59 degrees C and 1013.2 millibars

• 59 degrees C and 29.92” Hg

• 0 degrees C and 1013.2 millibars

Knowing the pressure altitude is important to aircraft performance because it can be used as a tool to arrive at _____________. (3.A.2)

• humidity

• air temperature

• density altitude

• buoyancy

Pressure altitude corrects for the difference between _______ and standard pressure. (3.B.1)

• humidity

• density altitude

• barometric pressure

• standard temperature

Which factor would tend to increase the density altitude at a given airport? (3.B.1 and 3.A.1)

• decrease in ambient temperature

• increase in barometric pressure

• decrease in relative humidity

• increase in ambient temperature

Pressure altitude is calculated from (29.92 – 28.92) × 1,000 + 3,500. What information do these numbers give? (3.B.1)

• The barometric pressure is 29.92 ”Hg and the elevation is 1,000 feet.

• The barometric pressure is 28.92 ”Hg and the elevation is 3,500 feet.

• The barometric pressure is 29.92 ”Hg and the elevation is 3,500 feet

• The barometric pressure is 28.92 ”Hg and the elevation is 1,000 feet.

Which of the following are units of measure for atmospheric pressure? Select all that apply. (3.A.2)

• feet per second (ft/s)

• square centimeters (cm2 )

• millibars (mb)

• pounds per square inch (psi)

• inches of mercury (Hg)

Which combination of atmospheric conditions will reduce takeoff and climb performance? (3.B.1 and 3.A.2)

• Low temperature, low relative humidity, and low density altitude

• High temperature, low relative humidity, and low density altitude

• Low temperature, high relative humidity, and high density altitude

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

Which statement is true about an object moving through a fluid?

• Viscosity changes according to the size of the object.

• The object moves faster if the fluid is more viscous.

• Fluid friction increases as the object's velocity increases.

• Less viscosity means more fluid friction.

Which formula is used for calculating density altitude? (3.A.1)

• mass + volume

• PA+ [120 (OAT - ISA)]

• (29.92 - Barometric Pressure) 1,000 + Elevation

• 15 (21,000 x PA)

Atmospheric pressure is _______ to air density. (3.A.2)

• equal to

• directly proportional

• inversely proportional

• unrelated