Revision Questions Aerodynamics

Question 1

When climbing at a content Mach number TAS will -

A. Decrease if temp decreases
B. Decrease 
C. Decrease if temp increases 
D. Increase
E. Remain constant

Answer 1

A. Decrease if temp decreases

Question 2

The difference between leading edge slats and leading edge flaps is -

A. They are two names for the same device
B. Slats reenergise the boundary layer and flaps alter the effective camber of the leading edge
C. Flaps reenergise the boundary layer and slats alter the effective camber of the leading edge
D. Flaps decrease the stall speed while slats increase the stall speed

Answer 2

B. Slats reenergise the boundary layer and flaps alter the effective camber of the leading edge

Question 3

Mcrit is -

A. That speed where all of the local airflow is supersonic
B. That speed where all of the local airflow is subsonic
C. That speed above which supersonic local airflow first occurs
D. None of the above

Answer 3

C. That speed above which supersonic local airflow first occurs

Question 4

An aircraft exceeds Mcrit. Assuming no ‘Mach trimmer’ is fitted, the first thing to occur would be -

A. Nose pitch up
B. Severe vibration, buffet and structural failure
C. Compressor stall
D. Nose pitch down

Answer 4

D. Nose pitch down

Question 5

Exceeding Mcrit results in a pitch nose down. This is because -

A. The CP moves rearward
B. The CP moves forward
C. The tail plane is producing excessive drag
D. None of the above

Answer 5

A. The CP moves rearward

Question 6

A mach trimmer -

A. Trims the aircraft for the nominated mach number
B. Stops aircraft exceeding Mcrit
C. Ensures that with increasing speed the aircraft will tend to pitch down
D. Ensures that with increasing speed the aircraft will tend to pitch up

Answer 6

D. Ensures that with increasing speed the aircraft will tend to pitch up

Question 7

On swept wing aircraft, nose pitch up at the stall is caused by -

A. Suddenly slat retraction
B. Elevator stall combined with a rearward C of G movement
C. Wingtip stall and the effective CP moving rearwards
D. Wingtip stall and the effective CP moving forwards

Answer 7

D. Wingtip stall and the effective CP moving forwards

Question 8

Vs when related to transport category aircraft is -

A. The minimum steady flight speed
B. The speed at which the aircraft stalls
C. Excess power over weight
D. Excess thrust over drag

Answer 8

A. The minimum steady flight speed

Question 9

You have descended to hold at 3000ft. At this altitude your ideal holding speed would primarily be determined by -

A. Engine RPM considerations
B. IAS considerations
C. Flap extension limits
D. Body angle limits

Answer 9

B. IAS considerations

Question 10

Swept wing aircraft employ a stick pusher system. The operates at -

A. 1.3Vs
B. 10kt above the stalling speed
C. The speed below which controlled level flight is not sustainable
D. 15 degrees angle of attack

Answer 10

C. The speed below which controlled level flight is not sustainable

Question 11

Jet aircraft over speed warnings will operate -

A. At Vmo/Mmo
B. Slightly above Vmo/Mmo
C. Slightly below Vmo/Mmo
D. Slightly below Vdf/Mdf

Answer 11

B. Slightly above Vmo/Mmo

Question 12

Mdet is -

A. Mcrit plus an allowance which varies for each aircraft type
B. That aircraft speed where the first local sonic flow occurs
C. That aircraft speed above which all the local flow is supersonic
D. The maximum Mach number for a particular aircraft type

Answer 12

C. That aircraft speed above which all the local flow is supersonic

Question 13

Optimum range is achieved for flying at -

A. A constant flight level, 1.32 Vimd and max cruise RPM
B. A cruise climb, 1.32 Vimd and max continuous RPM
C. A constant flight level, 1.32 Vimd and design RPM
D. A cruise climb, 1.32 Vimd and design RPM

Answer 13

D. A cruise climb, 1.32 Vimd and design RPM

Question 14

Climb IAS decreases with increased altitude because -

A. Maximum excess power occurs at a lower IAS at high altitude
B. Maximum excess power occurs at a lower TAS at high altitude
C. A constant angle of attack is required
D. The engines are producing less thrust as altitude increases

Answer 14

A. Maximum excess power occurs at a lower IAS at high altitude

Question 15

For a given altitude and weight, the IAS variation for max angle of climb if flap is extended is -

A. It increases to take advantage of the extras lift
B. It remains the same as the weight is the same
C. It decreases to maintain a lower minimum drag speed
D. It increases to maintain a higher minimum drag speed

Answer 15

C. It decreases to maintain a lower minimum drag speed

Question 16

Concerning slotted flaps and/or fowler flaps -

A. Slotted flaps increase the chord and preserve the energy in the boundary layer of the airflow while fowler flaps increase the camber and chord
B. Slotted flaps increase the camber and preserve the energy in the boundary layer of the airflow while Fowler flaps increase the camber and chord
C. Fowler flaps increase the chord and preserve the energy in the boundary layer of the airflow while slotted flaps increase the camber and chord
D. Fowler flaps increase the camber and preserve the energy in the boundary layer of the airflow while slotted flaps increase the camber and chord

Answer 16

B. Slotted flaps increase the camber and preserve the energy in the boundary layer of the airflow while Fowler flaps increase the camber and chord

Question 17

A nose down pitch change in an aircraft flying near Mcrit would be most likely to be caused by -

A. The Mach trimmer
B. A rearwards CP shift
C. A forwards CP shit
D. Jack stalling

Answer 17

B. A rearwards CP shift

Question 18

The minimum control speed ground (Vmcg) is lower than minimum control speed air (Vmca) because -

A. Pedal nose wheel steering is available on the ground
B. Differential braking is available on the ground
C. The main wheels are on the ground
D. Tiller nose wheel steering is available on the ground

Answer 18

C. The main wheels are on the ground

Question 19

Any head or tail wind component will reduce the distance to a PNR

True or False

Answer 19

True

Question 20

The angle of attack required for maximum range cruise does not vary with aircraft gross weight

True or false

Answer 20

True

Question 21

For a single sector with constant TAS, an increased wind component will always decrease the distance from departure to the PNR

True or false?

Answer 21

True

Question 22

Vmca of a twin engine turbo prop aircraft is determined on control with the critical engine inoperative and with a centre of gravity at the -

A. Most forward position
B. Most rearward position
C. CP position
D. Mid range position

Answer 22

B. Most rearward position

Rear CP = less rudder authority

Forward CP better for stall

Question 23

In a supersonic airstream, the static pressure behind the expansion wave -

A. Decreases
B. Increases
C. Remains constant
D. Increases then decreases

Answer 23

A. Decreases

Velocity increasing in a expansion wave

Question 24

The environmental variable which will result in an increased Vmca in a multi engine aeroplane is an increase in -

A. Temperature
B. Density
C. Pressure altitude
D. Humidity

Answer 24

B. Density

Vmca is based on power output / engine performance of live engine

Question 25

A B767 is in cruise with the stabiliser trim set correctly for a relatively forward centre of gravity. The position of the elevator would be -

A. Up
B. Down
C. Faired
D. Automatically adjusted by the autopilot

Answer 25

C. Faired

ELEVATOR position

Question 26

An increase in gross weight will cause the position of the total drag curve to move -

A. Up and left
B. Up and right
C. Down and left
D. Down and right

Answer 26

B. Up and right

Question 27

The deployment of spoilers, gear or flap will cause the position of the total drag curve to move -

A. Up and left
B. Up and right
C. Down and left
D. Down and right

Answer 27

A. Up and left

Question 28

In a steady asymmetric flight in a twin engined jet transport category aircraft, the crew elect to level the wings with rudder input. The position of the balance ball in this situation will be -

A. Half a ball toward failed engine
B. Half a ball toward live engine
C. Fully deflected toward operating engine
D. Centred

Answer 28

D. Centred

Question 29

You’re at an unusually high flight level for the current gross weight of the aircraft and cruising at normal cruise speed. During a manoeuvre you feel airframe buffet

The likely cause is -

A. High speed buffet because of the altitude
B. Low speed buffet because of the altitude
C. Either low speed or high speed buffet
D. Clear air turbulence

Answer 29

C. Either low speed or high speed buffet

‘Coffin corner’

Question 30

The yaw damper of a jet transport aircraft receives its yaw information control from -

A. The attitude gyro
B. The directional gyro
C. The rate gyro
D. The azimuth gyro

Answer 30

C. The rate gyro

Question 31

The transition in airflow speed marked by a normal shockwave and any accompanying change in airflow direction is -

A. From supersonic to subsonic, with no change in direction
B. From subsonic to supersonic, with change in direction
C. From subsonic to supersonic, with no change in direction
D. From supersonic to subsonic, with a change in direction

Answer 31

A. From supersonic to subsonic, with no change in direction

Question 32

A jet transport aircraft demonstrates positive oscillatory stability at 1000ft but instability at 9000ft

The change in aerodynamic damping and associated speed change which causes this is -

A. Reduced aerodynamic damping due to increased TAS
B. Increased aerodynamic damping due to increased TAS
C. Reduced aerodynamic damping due to increased EAS
D. Increased aerodynamic damping due to increased EAS

Answer 32

A. Reduced aerodynamic damping due to increased TAS

Question 33

When a swept wing aircraft suffers a wingtip stall, the centre of pressure moves -

A. Inwards and forward
B. Outwards and aft
C. Inwards and backwards
D. Outwards and forwards

Answer 33

A. Inwards and forward

Question 34

With an increase in altitude, the longitudinal stability of an aircraft -

A. Increases
B. Decreases
C. Remains constant
D. Increases to the tropopause then decreases

Answer 34

B. Decreases

Question 35

Buffet boundaries for a jet transport category aircraft will increase with an increase in -

A. Altitude
B. Gross weight
C. Mach number
D. Fuel burn

Answer 35

D. Fuel burn

Buffet boundaries increase with a lower weight