FAA Questions/Private Pilot/Question #273
weather theoryFAA-published question bank (Private Pilot, 2008)

Which conditions result in the formation of frost?

A

The temperature of the collecting surface is at or below freezing when small droplets of moisture fall on the surface.

B

The temperature of the collecting surface is at or below the dewpoint of the adjacent air and the dewpoint is below freezing.✓ Correct Answer

C

The temperature of the surrounding air is at or below freezing when small drops of moisture fall on the collecting surface.

Explanation

Frost forms when the collecting surface cools to or below the dewpoint of the adjacent air and that dewpoint is below freezing, so water vapor deposits directly as ice (PHAK Chapter 12). Frost is not frozen droplets falling on a surface; droplets freezing on contact describe freezing rain or drizzle.

← Previous273 / 393Next →

Related weather theory questions

Why is frost considered hazardous to flight?The mature stage of a thunderstorm begins withThe wind at 5,000 feet AGL is southwesterly while the surface wind is southerly. This difference in ...When there is a temperature inversion, you would expect to experienceWhen warm, moist, stable air flows upslope, it

Keep practising

Study more FAA Private Pilot questions, or take a timed practice quiz.

All Private Pilot QuestionsStart a Practice Quiz