Aviation Aerodynamics & Aircraft Performance 2

Question 1

What four factors affect aircraft performance at takeoff?

Accepted Answer

Density altitude, aircraft weight, wind, and runway surface/slope

Answer

Wind, fuel type, passenger weight, tire pressure

Answer

Air temperature only, runway length, fuel quantity, engine type

Answer

Altitude, humidity, propeller pitch, and oil viscosity

Question 2

What is density altitude?

Accepted Answer

Pressure altitude corrected for non-standard temperature

Answer

The altitude shown on the altimeter when set to 29.92 inHg

Answer

The altitude above mean sea level at a given airport

Answer

The altitude calculated from GPS coordinates

Question 3

An aircraft's POH states a ground roll of 1,000 feet under standard conditions. If density altitude is significantly higher than field elevation, what should the pilot expect?

Accepted Answer

A longer ground roll because the aircraft needs higher true airspeed to lift off

Answer

A shorter ground roll due to reduced friction

Answer

The same ground roll because indicated airspeed is constant

Answer

A shorter ground roll because the wings produce more lift in thin air

Question 4

How does a headwind affect takeoff performance?

Accepted Answer

It decreases ground roll by adding to the aircraft's airspeed relative to the air

Answer

It increases ground roll because thrust is reduced

Answer

It has no effect on takeoff distance

Answer

It increases stall speed, requiring more runway

Question 5

What is the best rate-of-climb speed (Vy) used for?

Accepted Answer

Gaining the greatest altitude in the shortest time

Answer

Achieving the steepest climb angle to clear obstacles

Answer

Gaining the greatest altitude in the shortest distance

Answer

Maintaining level flight at minimum power

Question 6

What is the significance of Vx (best angle of climb speed)?

Accepted Answer

It provides maximum altitude gain per horizontal distance traveled

Answer

It provides maximum altitude gain per minute

Answer

It is the speed for maximum endurance in cruise

Answer

It is the maximum speed in level flight

Question 7

If an aircraft's weight is increased, what happens to its stall speed?

Accepted Answer

Stall speed increases because more lift is required to support the greater weight

Answer

Stall speed decreases because the wings carry more momentum

Answer

Stall speed remains the same regardless of weight

Answer

Stall speed decreases due to increased inertia