Module 8 : Aerodynamics

Module 8 : Aerodynamics

Multiple Choice

Static stability and dynamic stability are two types of aircraft stability. True or false

• True

• False

Multiple Choice

Which statement is correct about Positive Static Stability?

• The tendency to move farther away from the original attitude following a disturbance

• The tendency of an aeroplane to return to its original attitude after displacement.

• If an aeroplane tends to remain in its displaced attitude.

Multiple Choice

What type of drag is the main by-product of lift generation.

• Parasite drag

• Form drag

• Induced drag

• Interference drag

Multiple Choice

Also known as as the centre of lift. Which is a point along the wing chord line where lift is considered to be concentrated.

• Center of gravity

• Center of pressure

• Pressure differential

• Centr-iaxial point

Multiple Choice

This angle is fixed in manufacture and does not change.

• Angle of attack

• Angle of Incidence

• Right angle

• Perpendicular angle

Multiple Choice

Which statement is correct about sweepback wing planforms ?

• It is the cheapest to build.

• It is a design for high speed.

• It is a design providing slowest speed.

• Design for increase in form drag.

Multiple Choice

Which statement is incorrect about the Four Aerodynamic Forces?

• Lift is parallel to the relative airflow.

• Drag is a resistance.

• Weight is due to gravity

• Thrust is produced by the engine

Multiple Choice

A stall is caused by the separation of airflow from the wing’s upper surface. This results in a rapid decrease in lift. True or false.

• True

• False

Multiple Choice

A slat is an example of lift augmentation devices in the leading edge of the wing,It is a fixed duct and is not necessary at all angles of attack. Correct or Incorrect.

• Correct

• Incorrect

Multiple Choice

Static stability is the initial tendency that an object displays after its equilibrium is disrupted. An aeroplane with positive static stability tends to return to its original attitude after displacement. True or false?

• True

• False

Multiple Choice

Which statement is incorrect about dynamic stability?

• Dynamic stability describes the time required for an aeroplane to respond to its static stability.

• It is determined by its tendency to oscillate and damp out successive oscillations after the initial displacement.

• Although an aeroplane may have positive static stability, it could have positive, negative, or neutral dynamic stability.

• May also be termed as ‘Passive Stability’ where no active control is needed by the pilot or device to maintain aircraft stability.

Multiple Choice

An aircraft in flight is free to rotate about three axes. It has a theoretical point where the entire weight of the aircraft is considered to be concentrated which all three axes pass through. What do you call this common point?

• Center of lift

• center of pressure

• centre of gravity (CG)

• Transition point

Multiple Choice

The aileron creates this motion.

• Pitch

• Roll

• Yawing

• Side slip

Multiple Choice

In the photo provided ,What is the type of wing angle shown ?

• Lateral diherdral

• Positive dihedral

• Anhedral

• Neutral angle

Multiple Choice

Dutch roll is a combination of what motion?

• Yaw and roll

• Pitch and side slip

• Roll and dive

• Spiral effect and spinning

Multiple Choice

The set of standard conditions to which performance of an aircraft could be measured is know as "ISA". ISA means?

• International Standard Atmosphere

• International Standard Aviation

• International Standard Aircraft

• Interactive Standard Atmosphere

Multiple Choice

What is the ISA value for pressure in PSI ?

• 29.92

• 101325

• 1

• 14.7

Multiple Choice

What is the ISA value for Tropopause height in feet ?

• 16,000 feet

• 18,000 feet

• 36,000 feet

• 11,000 feet

Multiple Choice

What percentage of oxygen is in the composition of gases in the earth's atmosphere ?

• 1%

• 21%

• 78%

• 100%

Multiple Choice

Civil aircraft would rarely exceed altitudes of 45,000 feet (nearly 14 km). The aircraft is only capable of flying in what layers of atmosphere?

• Tropopause and exosphere

• Mesosphere and highest part of stratosphere

• Only in troposphere

• only in the Troposphere and the lowest part of the Stratosphere

Multiple Choice

The higher we ascend in the atmosphere, the less will be the weight above us. Therefore, the pressure will be less.True or false?

• True

• False

Multiple Choice

As we ascend in the atmosphere, there is a gradual decrease in temperature. The temperature drops at a steady rate is called ?

• stall rate

• lapse rate

• thermal expansion rate

Multiple Choice

On a humid day air is less dense for a given volume due to water vapour displacing some of the dry air. Correct or Incorrect?

• Correct

• Incorrect

Multiple Choice

It refers to the actual amount of water vapour in a mixture of air and water.

• Absolute humidity

• Relative humidity

• Dew point

Multiple Choice

Air is a viscous fluid. True or false?

• True

• False

Multiple Choice

It is the layer of air adjacent to the surface of the body ( e.g airfoil,wings )

• Relative air

• Turbulent layer

• Boundary layer

• Laminar flow layer

Multiple Choice

It is an ORDERLY MOTION in which successive strata of air particles slide past each other in much the same way as the action of a pack of cards when thrown along a flat surface.

• Laminar flow

• Turbulent flow

• Transition point

Multiple Choice

A body shaped to produce the least possible resistance is called a ‘____________ shape’.

• form drag

• camber

• streamline

Multiple Choice

It is the direction of the airflow with respect to the wing. Also known as Relative Airflow.

• Relative wind

• Ram air

• Ambient airflow

• Atmosphere Airflow

Multiple Choice

Eddies or vortices rotates clockwise (viewed from the rear) from the left wing, and counter-clockwise from the right wing. True or false

• True

• False

Multiple Choice

That point on the wing at which the boundary layer changes from laminar to turbulent flow is called the ?

• Leading edge

• Separation point

• Stagnation point

• Transition point

Multiple Choice

Which statement is INCORRECT about camber?

• Camber is defined as the curvature of an aerofoil surface or an aerofoil section from the leading edge to the trailing edge.

• The degree or amount of camber is expressed as the ratio of the maximum departure of the curve from the chord to the chord length.

• Upper camber refers to the curve on the upper surface of an aerofoil, and lower camber refers to the curve of the lower surface.

• Camber is defined as the curvature of an aerofoil surface or an aerofoil section only in the lower surface.

Multiple Choice

What is a chordline?

• it is the curve line joining the leading edge to the trailing edge.

• it is the straight line joining the leading edge to the trailing edge.

• it is the straight line joining the leading edge to the transition point.

Multiple Choice

Which type of parasite drag is INCORRECT in the list?

• Form drag

• Skin friction drag

• Viscosity drag

• Interference drag.

Multiple Choice

Which type of parasite drag is INCORRECT in the list?

• Form drag

• Skin friction drag

• Viscosity drag

• Interference drag.