Aerodynamics Mock Exam 2019

What is the relationship between boiling point and pressure?

The boiling point of a given liquid varies directly with pressure.

Which atmospheric conditions cause the highest true landing speed?

High temperature with high humidity.

What happens to the volume of a confined liquid when its pressure is tripled at constant temperature?

Remain the same.

What force acts outward on an aircraft in an accelerated climbing flight?

Centrifugal force.

What is climb power?

It is the difference between power available and power required.

What does unsteady uniform flow mean?

At a given instant in time the conditions at every point are the same but will change with time

What is the main cause of temperature change in the adiabatic process?

Conversion of kinetic energy to internal energy

What equation relates pressure change with vertical height change?

Hydrostatic equation.

What energy conversion occurs at the upstream stagnation point?

Kinetic energy to pressure energy.

Why is calibration of airspeed instruments necessary?

To obtain the true airspeed

What is the approximate speed of sound in air at average altitude in the Troposphere?

620 knots.

How does true airspeed relate to indicated airspeed at altitude?

For a given true airspeed, indicated airspeed decreases as altitude increases.

Given an aircraft weighing 9000N with span loading 600 N/m2 and wing area of 30m2 . Compute for the aspect ratio.

7.5

What is the taper ratio of a wing with a root chord of 4.5 ft and a tip chord of 1.5 ft?

0.33.

A wing w/ a very high aspect ratio (in comparison w/ a low aspect ratio wing) will have?

A low stall speed.

Which basic flight maneuver increases the load factor on an airplane as compared to straight-and-level flight?

Turns

Define what is a Geopotential Altitude

Distance between Center of Earth and parallel surfaces around the spherical earth.

What effect, if any, does high humidity have on aircraft performance?

It decreases performance.

Which items are included in the empty weight of an aircraft?

Unusable fuel & undrainable oil.

What is Geometric Altitude?

Physical distance between aircraft and reference (e.g., Sea Level).

When will an aircraft's rate of climb be equal to zero?

When power required is equal to power available.

What do changes in the center of pressure of a wing affect?

Aerodynamic balance and controllability.

How does wake turbulence vortex circulate around each wingtip?

Inward, upward and around each tip.

What does Bernoulli's principle state?

Air travelling faster over the curved upper surface of an airfoil causes lower pressure on the top surface.

Floating caused by the phenomenon of ground effect will be most realized during an approach to land when at:

Less than the length of the wingspan above the surface.

An airplane said to be inherently stable will?

It requires less effort to control.

What determines the longitudinal stability of an airplane?

The location of the CG with respect to the center of lift.

During a spin to the left, which wing(s) is/are stalled?

Both wings are stalled

When are wingtip vortices created?

When an aircraft is developing lift.