[ Next Activity | Previous Activity | Activity Index | Back to Textbook ]

Check your knowledge! Take our fun quiz for the beginner How Air Moves Over Objects Section of the Fundamentals Chapter of our textbook! Follow the instructions and then click on the "Check it!" button for each question.

Advanced Activities: How Air Moves Over Objects?

1.	If you are close to an explosion you would here it after someone standing farther away. (Check the correct answer.)
	True False

2.	On a typical day the speed of sound is about _______ miles per hour. (Check the correct answer.)
	740 750 760

3.	The speed of sound changes with temperature but not altitude. (Check the correct answer.)
	True False

4.	Ernst Mach conducted the first meaningful experiments in supersonic flight. (Check the correct answer.)
	True False

5.	Air flow under Mach 1 is called _______ flow. (Check the correct answer.)
	supersonic hypersonic subsonic

6.	Airflow over Mach 1 is called ________ flow. (Check the correct answer.)
	supersonic hypersonic subsonic

7.	If the Mach number is greater than 5, that regime (pattern) is called ________ flow. (Check the correct answer.)
	supersonic hypersonic subsonic

8.	An airplane that experiences both subsonic and supersonic airflow, is in the transonic regime. (Check the correct answer.)
	True False

9.	Anything that moves against another object causes friction or resistance to motion between the two objects. (Check the correct answer.)
	True False

10.	Friction between a fluid and a surface is dependent on the density of the fluid and the smoothness of the surface. (Check the correct answer.)
	True False

11.	The distance from the original surface to the layer of the flow traveling at the original velocity is called the ________ layer thickness. (Check the correct answer.)
	laminar boundary boundary turbulent boundary

12.	For lower velocities, fluid flowing over a smooth surface that is relatively short and flat will only develop a very thin boundary layer. This condition is called _______ boundary layer. (Check the correct answer.)
	turbulent laminar

13.	When you have layers that start to mix and swirl, it is called a ________ boundary layer. (Check the correct answer.)
	laminar turbulent

14.	The region in the boundary layer where the orderly laminar layers start to mix together, but before they really start swirling,is called the _________ region. (Check the correct answer.)
	transition turbulent flow

15.	If the region of flow separation extends past the surface, this region is called a _______. (Check the correct answer.)
	vortex eddy wake

16.	When a flow separates on a wing, the condition is known as _______. (Check the correct answer.)
	wake vortex stall

17.	A streamline traces out the path of an element or piece of fluid as it travels in space and time around or through an object. (Check the correct answer.)
	True False

18.	When a plane flies faster than the speed of sound, you can hear it coming because of the shock wave it creates. (Check the correct answer.)
	True False

19.	Bernoulli's Theorem relates air pressure and viscosity. (Check the correct answer.)
	True False

[ Next Activity | Previous Activity | Activity Index | Back to Textbook ]

Web Hosting Provided By The National Business Aviation Association.

Explore Space ... Not Drugs!
Hear what astronauts have to say about staying drug-free.
Last modified: Fri Feb 19 13:00:50 PST 1999

Copyright © 1999 by Cislunar Aerospace, Inc. All Rights Reserved.