ATSC 231 Block 3 review UPDATED
ACTUAL Questions and CORRECT
Answers
A conceptual model for turbulence flow categorizes turbulence as either - CORRECT
ANSWER - waves or eddies
Airplanes that have a greater velocity have greater momentum. - CORRECT ANSWER -
true
The critical size range (or diameter) of eddies to be felt by aircraft as turbulence is between -
CORRECT ANSWER - 50 and 1500 ft
"The time rate of change of momentum of a body is equal to the force on the body" is a
statement of - CORRECT ANSWER - Newtons Second Law of Motion
"A body remains at rest or in a state of uniform motion unless it is acted on by a force" is a
statement of - CORRECT ANSWER - Newtons First Law of Motion
How would an upward directed force (such as a turbulence gust) affect the load factor of an
airplane? - CORRECT ANSWER - it would increase the load factor
The additional load factor that results from vertical gusts is _____ proportional to the wing
loading. - CORRECT ANSWER - inversely
Which load factor can be defined as the highest load factor that can be expected in normal
operations, and aircraft are designed to withstand these load factors without structural damage? -
CORRECT ANSWER - flight (or limit) load factor
Which factor does not determine the transition from laminar to turbulent flow in the atmosphere?
- CORRECT ANSWER - relative humidity
, A compensating downward current of air results from rising thermals, but the downdrafts are
over a broad area and therefore weaker than the updrafts. - CORRECT ANSWER - true
____________ stability is the state of a column of air in the atmosphere in which an ascending
(or descending) air parcel always has the same temperature (density) as the surrounding
environmental air - CORRECT ANSWER - Neutral
Which type of surface feature would heat-up the most and produce the strongest convective
thermals? - CORRECT ANSWER - sandy or rocky wastelands
What atmospheric phenomena prevents thermals from rising higher and is the top of the
convective (or mixed) layer? - CORRECT ANSWER - capping inversion
What is the name given to the shallow, absolutely unstable layer of air in contact with the Earth's
surface which produces bubbles of vertically rising air? - CORRECT ANSWER - super
adiabatic layer
One method used to describe thermals is the column or plume model. - CORRECT
ANSWER - true
____________ stability is the state of a column of unsaturated air in the atmosphere when its
lapse rate of temperature is less than the dry adiabatic lapse rate, but greater than the moist
adiabatic lapse rate. - CORRECT ANSWER - conditional
What are the requirements for Kelvin Helmholtz waves? - CORRECT ANSWER - strong
stability and strong shear
How does the boundary layer change with increasing wind speed? - CORRECT
ANSWER - the depth of the boundary layer increases
ACTUAL Questions and CORRECT
Answers
A conceptual model for turbulence flow categorizes turbulence as either - CORRECT
ANSWER - waves or eddies
Airplanes that have a greater velocity have greater momentum. - CORRECT ANSWER -
true
The critical size range (or diameter) of eddies to be felt by aircraft as turbulence is between -
CORRECT ANSWER - 50 and 1500 ft
"The time rate of change of momentum of a body is equal to the force on the body" is a
statement of - CORRECT ANSWER - Newtons Second Law of Motion
"A body remains at rest or in a state of uniform motion unless it is acted on by a force" is a
statement of - CORRECT ANSWER - Newtons First Law of Motion
How would an upward directed force (such as a turbulence gust) affect the load factor of an
airplane? - CORRECT ANSWER - it would increase the load factor
The additional load factor that results from vertical gusts is _____ proportional to the wing
loading. - CORRECT ANSWER - inversely
Which load factor can be defined as the highest load factor that can be expected in normal
operations, and aircraft are designed to withstand these load factors without structural damage? -
CORRECT ANSWER - flight (or limit) load factor
Which factor does not determine the transition from laminar to turbulent flow in the atmosphere?
- CORRECT ANSWER - relative humidity
, A compensating downward current of air results from rising thermals, but the downdrafts are
over a broad area and therefore weaker than the updrafts. - CORRECT ANSWER - true
____________ stability is the state of a column of air in the atmosphere in which an ascending
(or descending) air parcel always has the same temperature (density) as the surrounding
environmental air - CORRECT ANSWER - Neutral
Which type of surface feature would heat-up the most and produce the strongest convective
thermals? - CORRECT ANSWER - sandy or rocky wastelands
What atmospheric phenomena prevents thermals from rising higher and is the top of the
convective (or mixed) layer? - CORRECT ANSWER - capping inversion
What is the name given to the shallow, absolutely unstable layer of air in contact with the Earth's
surface which produces bubbles of vertically rising air? - CORRECT ANSWER - super
adiabatic layer
One method used to describe thermals is the column or plume model. - CORRECT
ANSWER - true
____________ stability is the state of a column of unsaturated air in the atmosphere when its
lapse rate of temperature is less than the dry adiabatic lapse rate, but greater than the moist
adiabatic lapse rate. - CORRECT ANSWER - conditional
What are the requirements for Kelvin Helmholtz waves? - CORRECT ANSWER - strong
stability and strong shear
How does the boundary layer change with increasing wind speed? - CORRECT
ANSWER - the depth of the boundary layer increases
