Chapter 4

Question 1

The difference between Pressure Altitude and True Altitude.

Answer 1

D-Value

Question 2

A sudden increase in wind speed by a magnitude of 16Kts or greater to a sustained speed for a period of 1 minute.

Answer 2

Squall

Question 3

Reported when there is at lease a 10Kts variation.

Answer 3

Gust

Question 4

The movement of air that results from differential heating.

Answer 4

Thermal Circulation

Question 5

A VECTOR QUANTITY of wind.

Answer 5

Wind Velocity

Question 6

Wind blow in the counterclockwise direction.

Answer 6

Anti-Cyclonic Flow

Question 7

The force that resists the relative motion of two bodies in contact.

Answer 7

Friction

Question 8

The MAGNITUDES of Wind Velocity.

Answer 8

Wind Speed

Question 9

The resistance of the atmosphere to the relative motion of the aircraft.

Answer 9

Drag

Question 10

The maximum instantaneous wind speed greater than 25Kts since the last hourly observation.

Answer 10

Peak Wind Speed

Question 11

Can only happen when the wind is already blowing.

Answer 11

Geostrophic Balance

Question 12

Produces the centripetal acceleration.

Answer 12

Centrifugal Force

Question 13

Always acts 90 degrees to the right of the wind, looking downstream.

Answer 13

Coriolis Force.

Question 14

The direction FROM which the wind is blowing.

Answer 14

Wind Direction

Question 15

Wind blow in the clockwise direction.

Answer 15

Cyclonic Flow

Question 16

The difference in pressure between two points divided by the distance between the two points.

Answer 16

Pressure Gradient Force

Question 17

The resistive force that arises from a skin friction and turbulence near the earth’s surface.

Answer 17

Surface Friction

Question 18

A transition zone between large surface frictional effect near the ground and negligible effect about the boundary layer.

Answer 18

Boundary Layer