POF Q19 - Controls Part 3 Flashcards
Which three aerodynamic devices decrease manoeuvring stick forces?
Select one:
a.Spring tab - horn balance - bobweight.
b.Servo tab - horn balance - spring tab.
c.Servo tab - trim tab - balance tab.
d.Spring tab - trim tab - mass balancing weight.
b.Servo tab - horn balance - spring tab.
Which statement is correct about a spring tab?
Select one
a.Its main purpose is to increase stick force per G.
b.At high IAS it behaves like a servo tab.
c.At high IAS it behaves like a fixed extension of the elevator.
d.At low IAS it behaves like a servo tab.
b.At high IAS it behaves like a servo tab.
In a servo tab operated control system, movement of the tab:
Select one
a.is controlled directly by the main control surface.
b.may be either opposite or in the same direction as the control surface.
c.is always in the same direction as the control surface.
d.is always in the opposite direction to the control surface.
d.is always in the opposite direction to the control surface.
Which aerodynamic design features can be used to reduce control forces?
Select one:
a.Horn balance, balance tab, servo tab.
b.Balance tab, control surfaces with increased area behind the hinge, artificial feel system.
c.Mass balance, horn balance, artificial feel system.
d.Servo tab, bobweight, control surfaces with increased area.
a.Horn balance, balance tab, servo tab.
A horn balance in a control system has the following purpose:
Select one
a.to obtain mass balancing.
b.to decrease stick forces.
c.to decrease the effective longitudinal dihedral of the aeroplane.
d.to prevent flutter.
b.to decrease stick forces.
The purpose of “aerodynamic balance” of a flying control is to:
Select one
a.reduce the load required to move the control.
b.reduce the control load to zero.
c.prevent flutter of the flying control.
d.balance the aircraft about its axes.
a.reduce the load required to move the control.
Comparing the differences between a horizontal trimmable stabiliser and an elevator trim tab, which of these statements are correct or incorrect?
1) A stabiliser trim is more suitable to cope with the large trim changes generated by the high lift devices on most jet transport aeroplanes.
2) A stabiliser trim runaway causes less control difficulty.
Select one:
a.1) is incorrect, 2) is incorrect.
b.1) is correct, 2) is incorrect.
c.1) is incorrect, 2) is correct.
d.1) is correct, 2) is correct.
b.1) is correct, 2) is incorrect.
What are the secondary effects of rudder (i) and aileron (ii) deflection respectively?
Select one:
a.(i) roll; (ii) yaw
b.(i) yaw; (ii) pitch
c.(i) yaw; (ii) roll.
d.(i) pitch; (ii) roll
a.(i) roll; (ii) yaw
A jet aeroplane equipped with inboard and outboard ailerons is cruising at its normal cruise Mach number. In this case:
Select one
a.the inboard and outboard ailerons are active.
b.only the spoilers will be active, not the ailerons.
c.only the inboard ailerons are active.
d.only the outboard aileron are active.
c.only the inboard ailerons are active.
When an aircraft is rolled to the left, adverse yaw will be reduced by:
Select one
a.the leading edge of the down-going aileron protruding into the airflow.
b.the down-going aileron moving through a greater angle of deflection than the up-going aileron.
c.frise ailerons producing increased drag on both surfaces.
d.a frise aileron being effective on the left wing.
d.a frise aileron being effective on the left wing.
Aileron deflection causes a rotation around the longitudinal axis by:
Select one
a.causing sideslip, which generates a rolling moment.
b.changing the wing camber and the two wings therefore produce different lift values resulting in a moment about the longitudinal axis.
c.changing the wing drag and the two wings therefore produce different lift values resulting in a moment about the longitudinal axis.
d.aileron secondary effect.
b.changing the wing camber and the two wings therefore produce different lift values resulting in a moment about the longitudinal axis.
When the control column is moved forward and to the right:
Select one:
a.the elevators move down, the right aileron moves down and the left aileron moves up.
b.the elevators move up, the right aileron moves up and the left aileron moves down.
c.the elevators move down, the right aileron moves up and the left aileron moves down.
d.the elevators move up, the right aileron moves down and the left aileron moves up.
c.the elevators move down, the right aileron moves up and the left aileron moves down.
During initiation of a turn with speed brakes extended, the roll spoiler function induces a spoiler deflection:
Select one
a.on the up-going wing only.
b.downward on the up-going wing and upward on the down-going wing.
c.on the down-going wing only.
d.upward on the up-going wing and downward on the down-going wing.
b.downward on the up-going wing and upward on the down-going wing.
Which component of drag increases most when an aileron is deflected upwards?
Select one:
a.Induced drag.
b.Form drag.
c.Interference drag.
d.Wave drag.
b.Form drag.
One method to compensate adverse yaw is a:
Select one
a.antibalance tab.
b.balance tab.
c.balance panel.
d.differential aileron.
d.differential aileron.
