Aircraft ControlsAircraft & Engines — DGCA CPL practice questions
Question 1 of 6
The elevator controls movement about the:
All 6 questions — Aircraft Controls
Aircraft & Engines · DGCA CPL. The correct option is marked on each.
Q1. The elevator controls movement about the:
- A.Longitudinal axis
- B.Lateral axis✓
- C.Normal axis
- D.Drag axis
Why: Elevator → pitch about the lateral axis; ailerons → roll about the longitudinal axis; rudder → yaw about the normal axis.
Q2. An anti-balance tab moves:
- A.Opposite to the control surface, reducing stick force
- B.In the same direction as the control surface, increasing stick force✓
- C.Only when selected by the pilot
- D.Only on the ground
Why: Anti-balance tabs move WITH the surface to add feel (stick force) and effectiveness; balance tabs move opposite to lighten the controls.
Q3. With a servo tab system, the pilot's controls are connected to:
- A.The main control surface directly
- B.The tab only✓
- C.Both surface and tab
- D.A hydraulic actuator
Why: The pilot moves only the tab; the aerodynamic force on the tab then drives the main surface.
Q4. Adverse aileron yaw is caused by:
- A.More induced drag on the down-going aileron's wing✓
- B.More induced drag on the up-going aileron's wing
- C.Rudder deflection
- D.Propeller torque
Why: The down-going aileron (rising wing) makes more lift AND more induced drag, yawing the nose away from the turn; differential or Frise ailerons reduce it.
Q5. When spoilers are used for roll control they:
- A.Cause strong adverse yaw
- B.Do not cause adverse yaw✓
- C.Increase lift on the down-going wing
- D.Can only be used on the ground
Why: Raising a spoiler dumps lift AND adds drag on the down-going wing, so the yaw is into the turn — no adverse yaw.
Q6. Ground spoilers (lift dumpers) are deployed on landing to:
- A.Increase lift for a gentle touchdown
- B.Dump lift so the full weight is on the wheels for effective braking✓
- C.Assist nose-wheel steering
- D.Reduce engine noise
Why: Dumping all wing lift transfers the aircraft's weight to the wheels, maximising brake effectiveness.