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080 – PRINCIPLES OF FLIGHT
081-01

SUBSONIC AERODYNAMICS
081-01-01 Basics, laws and definitions

2625
...
Assuming ISA conditions, which statement with respect to the climb is correct?
A – At constant TAS the Mach number decreases
B – At constant Mach number the IAS increases
C – At constant IAS the TAS decreases
D – At constant IAS the Mach number increases
Ref: AIR: atpl, cpl;
Ans: D
3848
...
The point about which the wing pitching moment is independent of angle of
attack is called:
A – the pitching centre
B – the centre of gravity
C – the centre of pressure
D – the aerodynamic centre
Ref: AIR: atpl, cpl;
Ans: D
4184
...
The unit of density is:
A – Bar
B – psi
C – kg/cm2
D – kg/m3
Ref: AIR: atpl, cpl;
Ans: D
4199
...
The term angle of attack is defined as:
A – the angle that determines the magnitude of the lift force
B – the angle between the wing chord line and the relative wind
C – the angle between the relative airflow and the horizontal axis
D – the angle between the wing and tailplane incidence
Ref: AIR: atpl, cpl;
Ans: B
4202
...
At a constant IAS, induced drag is affected by:
A – aircraft weight
B – changes in thrust
C – angle between chord line and longitudinal axis
D – wing location
Ref: AIR: atpl, cpl;
Ans: A
4213
...
At a constant CAS when flying below sea level an aircraft will have:
A – a higher TAS than at sea level
B – a lower TAS than at sea level at ISA conditions
C – the same TAS as at sea level
D – the same TAS, but an increased IAS
Ref: AIR: atpl, cpl;
Ans: B
4232
...
The units of wing loading (i) W / S and (ii) dynamic pressure q are:
A – (i) N/m2; (ii) kg/m2
B – (i) kg/m; (ii) N/m2
C – (i) N/m; (ii) kg
D – (i) N/m2; (ii) N/m2
Ref: AIR: atpl, cpl;
Ans: D
4252
...
The units of the density of the air (i) and the force (ii) are:
A – (i) kg/m3; (ii) N
B – (i) kg/m3; (ii) kg
C – (i) N/m3; (ii) N
D – N/kg; (ii) kg
Ref: AIR: atpl, cpl;
Ans: A
7643
...
The dynamic pressure in the undisturbed flow and in the throat are equal
2
...
A symmetrical aerofoil section at CL = 0 will produce?
A – A negative (nose down) pitching moment
B – A positive (nose up) pitching moment
C – Zero pitching moment
D – No aerodynamic force
Ref: AIR: atpl, cpl;
Ans: C
7650
...
What is the SI unit that results from multiplying kg and m/s2?
A – Joule
B – Psi
C – Newton
D – Watt
Ref: AIR: atpl, cpl;
Ans: C
7658
...
What happens to total drag when accelerating from CL MAX to maximum
speed?
A – Increases
B – Increases then decreases
C – Decreases
D – Decreases then increases
Ref: AIR: atpl, cpl;
Ans: D
7689
...
4 times the lift
B - twice the lift
C – four times the lift
D – the same lift
Ref: AIR: atpl, cpl;
Ans: D

7691
...
Which of the following is the correct description of the method for measuring
the dihedral angle?
A – The angle between the wing plane and the horizontal
B – The angle between a line which passes through the 25% wing chord and
the horizontal axis
C – The angle between the 25% chord line and the horizontal axis
D – The angle between 25% chord and the lateral axis
Ref: AIR: atpl, cpl;
Ans: A
7700
...
What phenomena causes induced drag?
A – Wing tip vortices
B – Wing tanks
C – The increased pressure at the leading edge
D – The spanwise flow, inward below the wing and outward above
Ref: AIR: atpl, cpl;
Ans: A

7707
...
The following unit of measurement kgm/s? is expressed in the SI-system as:
A – Pascal
B – Newton
C – Joule
D – Watt
Ref: AIR: atpl, cpl;
Ans: B
7715
...
Which of the following is the speed that would activate the stick shaker:
A – 1
...
05 VS
C – 1
...
If the IAS is increased by a factor of 4, by what factor would the drag increase?
A–4
B–8
C – 12
D – 16
Ref: AIR: atpl, cpl;
Ans: D
7724

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