Anúncios
1
As altitude increases, the stall speed (IAS):
remains constant regardless of altitude.
remains constant until the tropopause but at higher altitudes increases
initially remains constant but at higher altitudes decreases.
initially remains constant but at higher altitudes increases
2
When a pilot makes a turn in horizontal flight, the stall speed :
increases with the square root of load factor
increases with flap extension
increases with the load factor squared
decreases with increasing bank angle
3
The stall speed in a 60° banked turn increases by the following factor:
1.07.
1.30.
2.00.
1.41.
4
The trailing edge flaps when extended :
increase the zero lift angle of attack
significantly lower the drag
significantly increase the angle of attack for maximum lift
degrade the best angle of glide
5
When trailing edge flaps are extended in level flight, the change in pitching moment, ignoring any effects on the tailplane, will be:
nose up
dependent on cg location.
nose down
zero.
6
Extension of leading edge flaps will:
increase critical angle of attack.
decrease CLmax.
decrease drag.
not affect critical angle of attack.
7
On FAR 23 airplane, the limit load factor in normal category is:
4,4 G
+6,0 G
+3,2 G
+3,8 G
8
If an aircraft is flying at a speed above VA:
A full elevator deflection could cause a structural damage.
An overspeed warning will be indicated.
The aircraft can not stall.
The airplane can destroy itself when in a bank.
9
By what percentage does VA (EAS) alter when the aeroplane's weight decreases by 19%?
4.36% lower.
No change.
19% lower
10% lower
10
Which of these statements about the gust load factor on an aeroplane are correct or incorrect? I. When the slope of the lift curve versus angle of attack curve decreases, the gust load factor decreases. II. When the wing loading decreases, the gust load factor decreases.
I is incorrect, II is incorrect.
I is incorrect, II is correct
I is correct, II is correct
I is correct, II is incorrect.
11
The twisting of a propeller blade from root to tip has been made to:
Provide a constant angle of attack from root to tip.
To prevent excessive stress at the blade tip at high RPM
To ensure its optimum thrust is always achieved at take off.
To provide its greatest thrust toward the blade root.
12
The number of blades in a propeller would be increased:
To increase power absorption capability
To enable a longer undercarriage to be fitted
To reduce noise.
To increase the efficiency of the variable pitch mechanism
13
The propeller noise can be minimised by:
Increase number of blades.
Reduce the propeller area.
Reduce the RPM of the engine
Decrease the angle of attack of the propeller
14
The four forces of lift, weight, thrust and drag in level flight act through:
The C of P.
The Aft limit
The C of G.
The Aerodynamic Centre.
15
An aircraft in flight is affected by loads. These may be classified as:
Compressive, bending, shear and torsional.
Thrust, drag, lift and weight.
Compressive, tensile, shear and torsional.
Tensile, shear, twisting and stretching
16
During the glide, the forces acting on an aircraft are:
Drag, thrust and weight.
Lift, drag and weight.
Thrust, lift and drag.
Lift, weight and thrust
17
In a steady banked turn the lift will:
Equal the resultant of weight and centrifugal force.
Equal the weight.
Equal the centrifugal force.
Equal the centrifugal force minus the weight.
18
In a level banked turn, the stalling speed will:
Remain the same
Decrease
very inversely with wing loading.
Increase
19
Total pressure is: (rho = density)
static pressure plus dynamic pressure.
static pressure minus dynamic pressure.
measured at a small hole in a surface, parallel to the local stream.
½ rho V².
20
The unit of measurement for density is:
kg/cm²
psi.
bar.
kg/m³.
21
The stall speed:
increases with the length of the wingspan.
increases with an increased weight.
decreases with an increased weight.
does not depend on weight.
22
: Which statement is correct?
Spoiler extension increases the stallspeed, the minimum rate of descent and the minimum angle of descent.
Flap extension reduces the stallspeed, which increases the maximum glide distance.
Flap extension reduces the maximum lift/drag ratio thus reducing the minimum rate of descent
Flap extension has no effect on the minimum rate of descent as this is only affected by TAS
23
Consider an aerofoil with a certain camber and a positive angle of attack. At which location will the highest flow velocities occur?
Lower side.
In the stagnation point.
In front of the stagnation point.
Upper side.
24
As the Mach number increases in straight and level flight, a shock wave on the upper surface of the wing will:
move towards the trailing edge.
disappear
not move.
move towards the leading edge.
25
Floating due to ground effect during an approach to land will occur:
when the height is less than halve of the length of the wing span above the surface.
when a higher than normal angle of attack is used.
at a speed approaching the stall.
when the height is less than twice the length of the wing span above the surface.
