Self-assessment prototype

These three questions demonstrate a book-local practice component. Choose one answer and select Check answer. You can retry freely; answers are not saved or reported. Without JavaScript, use Answer and explanation below each question.

What vertical force balance is required for steady hover?

• (a) Total thrust is zero.

• (b) Upward thrust balances the drone’s weight.

• (c) Upward thrust continuously exceeds the drone’s weight.

Answer and explanation

Correct answer: (b). In steady hover, vertical acceleration is zero, so thrust balances weight.

Which sensor measures angular velocity?

• (a) A gyroscope.

• (b) A time-of-flight range sensor.

• (c) A camera.

Answer and explanation

Correct answer: (a). A gyroscope measures angular velocity about its sensing axes.

What does the proportional term of an altitude controller respond to?

• (a) Only the accumulated past altitude error.

• (b) Only the rate of change of altitude error.

• (c) The current altitude error.

Answer and explanation

Correct answer: (c). Proportional feedback responds to the current difference between target and measured altitude.