POF Q35 - High Altitude and High Mach Number Flashcards
Assuming ISA conditions, climbing at a constant Mach Number up to FL 350 the TAS will:
Select one:
a.first increase, then decrease
b.remain constant
c.increase
d.decrease
d.decrease
An aeroplane is descending at a constant Mach number from FL 350. What is the effect on true airspeed ?
Select one:
a.It decreases as altitude decreases
b.It increases as temperature increases
c.It remains constant
d.It decreases as pressure increases
b.It increases as temperature increases
During a climb at a constant IAS, the Mach Number:
Select one:
a.increase.
b.increase initially and remain constant subsequently.
c.remain constant.
d.decrease initially and increase subsequently.
a.increase.
Assuming ISA conditions, which statement with respect to the climb is correct?
Select one:
a.At constant Mach number the IAS increases
b.At constant IAS the TAS decreases
c.At constant IAS the Mach number increases
d.At constant TAS the Mach number decreases
c.At constant IAS the Mach number increases
The Mach-trim function is installed on most commercial jets in order to minimize the adverse effects of:
Select one:
a.uncontrolled changes in stabilizer setting
b.changes in the position of centre of pressure
c.compressibility effects on the stabilizer
d.increased drag due to shock wave formation
b.changes in the position of centre of pressure
Tuck under is caused by aNo (I) downforce at the location at the stabiliser caused by separation at the (II)
Select one:
a.(I) reduction (ii) tip
b.(I) increase (ii) root
c.(I) reduction (ii) root
d.(I) increase (ii) root
c.(I) reduction (ii) root
Which of the following flight phenomena can only occur at Mach numbers above the critical Mach number?
Select one:
a.Speed instability.
b.Mach tuck
c.Elevator stall.
d.Dutch roll.
b.Mach tuck
An aeroplane is flying through the transonic range. As the Mach Number increases the centre of pressure of the wing will move aft. This movement requires:
Select one:
a.much more thrust from the engine.
b.a higher IAS to compensate the nose down effect.
c.a pitch up input of the stabiliser.
d.a stability augmentation system to improve dynamic stability.
c.a pitch up input of the stabiliser.
Tuck under will happen
Select one:
a.only at the critical Mach number.
b.above or below the critical Mach number depending on the angle of attack.
c.only below the critical Mach number.
d.only above the critical Mach number.
d.only above the critical Mach number.
On a swept wing aeroplane at low airspeed, the ‘pitch up’ phenomenon:
Select one:
a.is caused by wingtip stall
b.never occurs, since a swept wing is a ‘remedy’ to pitch up
c.is caused by extension of trailing edge lift augmentation devices
d.is caused by boundary layer fences mounted on the wings
a.is caused by wingtip stall
When Descending at constant Mach what happens to the (i) Pitch angle (ii) Descent Angle (iii) AoA?
a.(i) decreases (ii) decreases (iii) increases
b.(i) decreases (ii) increases (iii) decreases
c.(i) remains constant (ii) remains constant (iii) remains constant
d.(i) increases (ii) remains constant (iii) increases
b.(i) decreases (ii) increases (iii) decreases
An aircraft is climbing at constant Mach after passing the changeover altitude. What happens to (i) Pitch Angle (ii) CL (iii) Climb Angle?
a.(i) increases (ii) increases (iii) decreases
b.(i) increases (ii) remains constant (iii) decreases
c.(i) decreases (ii) remains constant (iii) decreases
d.(i) decreases (ii) increases (iii) decreases
d.(i) decreases (ii) increases (iii) decreases
The aircrafts Manoeuvrability increases past MDRAG DIVERGENCE
Select one:
True
False
False
The altitude at which an aircraft will experience both High speed and Low speed Buffet is known as?
The Aerodynamic Ceiling
What Load Factor is normally used to determine buffet onset mach numbers?
a.2.1g
b.1.5g
c.1g
d.1.3g
d.1.3g
