IRA Exam Questions and Answers-
Weather
if severe turbulence is encountered during your IFR flight the airplane should be slowed to the design
maneuvering speed because - Answer-the airplane will stall before exceeding the load limit
A characteristic of the stratosphere is - Answer-relatively small changes in temperature with an increase
in altitude
the average height of the troposphere in the middle altitude is - Answer-37,000 feet
which feature is associated with the tropopause? - Answer-abrupt change in temperature lapse rate
a common type of ground or surface based temperature inversion is that which is produced by -
Answer-ground radiation on clear cool night when the wind is light
how much colder than standard is the forecast temperature at 9,000 feet as indicated in the following
excerpt from the winds and temperature aloft forecast - Answer-7 C
1431
The primary cause of all changes in the earths weather is - Answer-a variation of solar energy recieved
by the earths regions
,1432 the most frequent type of ground or surface based temperature inversion is that produced by -
Answer-radiation on a clear relatively still night
1433 If the air temperature is 8 C at an elevation of 1350 feet and a standard temperature lapse rate
exists, what will be the approximate freezing level - Answer-3550 feet MSL
1434 what feature is associated with a temperature inversion - Answer-a stable layer of air
which weather conditions should be expected beneath a low level temperature inversion later when the
relative humidity is high - Answer-smooth air and poor viz due to fog, haze, or low cloud
1440 what causes surface winds to flow across the isobars at an angle rather than parallel to the
isobars? - Answer-surface friction
1441 which force in the northern hemisphere, acts at a right angle to the wind and deflects it to the
right until parallel to the isobars? - Answer-coriolis
1442 hazardous windshear is commonly encountered near the ground - Answer-during periods of
strong temperature inversion and near thunderstorms
1443 The presence of ice pellets at the surface is evidence that - Answer-there is freezing rain at a
higher alitude
1444 to which meteorological condition does the term dew point refer - Answer-the temperature to
which the air must be cool to become saturated
1445 The presence of wet snow at your flight altitude indicates the freezing level is - Answer-above you
1446 what enhances the growth rate of precipitation - Answer-upward currents
, 1447 which precipitation type normally indicates freezing rain at higher altitudes? - Answer-ice pellets
1448 what type of clouds will be formed if very stable moist air is forced up slope? - Answer-Stratified
clouds with little vertical development
1449 Stability can be determined from which measurement of the atmosphere? - Answer-Ambient
Lapse Rate
1450 What determines the structure or type of clouds which form as a result or air being forced to
ascend - Answer-the stability of the air before lifting occurs
1451 What does the suffix "nimbus" when used in naming clouds, mean? - Answer-a rain cloud
1452 What are the four families of clouds? - Answer-High, Middle, Low and thos with extensive vertical
development
1453 a high cloud is mostly composed of - Answer-ice crystals
1454 steady precipitation in contrast to shower, preceding a front is an indication of - Answer-
stratiform clouds with little or no turbulence
1455 the general characteristics of unstable air are - Answer-good viz, showery precip, and cumuliform
type clouds
1456 what is a characteristic of stable air - Answer-stratiform clouds
1457 frontal waves normally form on - Answer-slow moving cold fronts or stationary fronts
Weather
if severe turbulence is encountered during your IFR flight the airplane should be slowed to the design
maneuvering speed because - Answer-the airplane will stall before exceeding the load limit
A characteristic of the stratosphere is - Answer-relatively small changes in temperature with an increase
in altitude
the average height of the troposphere in the middle altitude is - Answer-37,000 feet
which feature is associated with the tropopause? - Answer-abrupt change in temperature lapse rate
a common type of ground or surface based temperature inversion is that which is produced by -
Answer-ground radiation on clear cool night when the wind is light
how much colder than standard is the forecast temperature at 9,000 feet as indicated in the following
excerpt from the winds and temperature aloft forecast - Answer-7 C
1431
The primary cause of all changes in the earths weather is - Answer-a variation of solar energy recieved
by the earths regions
,1432 the most frequent type of ground or surface based temperature inversion is that produced by -
Answer-radiation on a clear relatively still night
1433 If the air temperature is 8 C at an elevation of 1350 feet and a standard temperature lapse rate
exists, what will be the approximate freezing level - Answer-3550 feet MSL
1434 what feature is associated with a temperature inversion - Answer-a stable layer of air
which weather conditions should be expected beneath a low level temperature inversion later when the
relative humidity is high - Answer-smooth air and poor viz due to fog, haze, or low cloud
1440 what causes surface winds to flow across the isobars at an angle rather than parallel to the
isobars? - Answer-surface friction
1441 which force in the northern hemisphere, acts at a right angle to the wind and deflects it to the
right until parallel to the isobars? - Answer-coriolis
1442 hazardous windshear is commonly encountered near the ground - Answer-during periods of
strong temperature inversion and near thunderstorms
1443 The presence of ice pellets at the surface is evidence that - Answer-there is freezing rain at a
higher alitude
1444 to which meteorological condition does the term dew point refer - Answer-the temperature to
which the air must be cool to become saturated
1445 The presence of wet snow at your flight altitude indicates the freezing level is - Answer-above you
1446 what enhances the growth rate of precipitation - Answer-upward currents
, 1447 which precipitation type normally indicates freezing rain at higher altitudes? - Answer-ice pellets
1448 what type of clouds will be formed if very stable moist air is forced up slope? - Answer-Stratified
clouds with little vertical development
1449 Stability can be determined from which measurement of the atmosphere? - Answer-Ambient
Lapse Rate
1450 What determines the structure or type of clouds which form as a result or air being forced to
ascend - Answer-the stability of the air before lifting occurs
1451 What does the suffix "nimbus" when used in naming clouds, mean? - Answer-a rain cloud
1452 What are the four families of clouds? - Answer-High, Middle, Low and thos with extensive vertical
development
1453 a high cloud is mostly composed of - Answer-ice crystals
1454 steady precipitation in contrast to shower, preceding a front is an indication of - Answer-
stratiform clouds with little or no turbulence
1455 the general characteristics of unstable air are - Answer-good viz, showery precip, and cumuliform
type clouds
1456 what is a characteristic of stable air - Answer-stratiform clouds
1457 frontal waves normally form on - Answer-slow moving cold fronts or stationary fronts
