CPL Aircraft General Knowledge 3

Question 1

The primary cause of the lag experienced with a vertical speed indicator (VSI) is:

Accepted Answer

The time required for pressure changes to pass through the calibrated leak

Answer

VSI lag of 6–9 seconds results from the time required for pressure differences to equalize through the instrument's calibrated metering orifice.

Question 2

When an altimeter is set to 29.92 in. Hg, the altitude displayed is:

Accepted Answer

Pressure altitude

Answer

Setting 29.92 in. Hg (standard sea-level pressure) into the altimeter causes it to read pressure altitude, the basis for flight level operations.

Question 3

If the pitot tube becomes completely blocked (with static port open), the airspeed indicator will:

Accepted Answer

Act like an altimeter, increasing with climb and decreasing with descent

Answer

A blocked pitot tube traps ram pressure; as altitude changes, only static pressure varies, making the ASI behave like an altimeter.

Question 4

The attitude indicator (artificial horizon) uses which gyroscopic principle to maintain its reference?

Accepted Answer

Rigidity in space

Answer

The attitude indicator's gyroscope relies on rigidity in space — a spinning gyro resists changes to its orientation, maintaining a fixed attitude reference.

Question 5

A heading indicator must be periodically synchronized with the magnetic compass because:

Accepted Answer

Gyroscopic precession and bearing friction cause gradual drift

Answer

Gyroscopic precession and mechanical bearing friction cause the heading indicator to drift from its true heading, requiring resynchronization approximately every 15 minutes.

(CPL) Commercial Pilot Licence Practice Test

(CPL) Commercial Pilot Licence Practice Test

CPL Aircraft General Knowledge 3