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IFR (Instrument Rating) Airman Knowledge Test Questions 2007
141.
Which is a characteristic of stable air?
A) Fair weather cumulus clouds.
B) Stratiform clouds.
C) Unlimited visibility.
142.
The general characteristics of unstable air are
A) good visibility, showery precipitation, and cumuliform type clouds.
B) good visibility, steady precipitation, and stratiform type clouds.
C) poor visibility, intermittent precipitation, and cumuliform type clouds.
143.
What type of clouds will be formed if very stable moist air is forced up slope?
A) First stratified clouds and then vertical clouds.
B) Vertical clouds with increasing height.
C) Stratified clouds with little vertical development.
144.
In what localities is advection fog most likely to occur?
A) Coastal areas.
B) Mountain slopes.
C) Level inland areas.
145.
Fog is usually prevalent in industrial areas because of
A) atmospheric stabilization around cities.
B) an abundance of condensation nuclei from combustion products.
C) increased temperatures due to industrial heating.
146.
Which weather condition can be expected when moist air flows from a relatively warm surface to a colder surface?
A) Increased visibility.
B) Convective turbulence due to surface heating.
C) Fog.
147.
Frontal waves normally form on
A) slow moving cold fronts or stationary fronts.
B) slow moving warm fronts and strong occluded fronts.
C) rapidly moving cold fronts or warm fronts.
148.
To which meteorological condition does the term 'dew point' refer?
A) The temperature to which air must be cooled to become saturated.
B) The temperature at which condensation and evaporation are equal.
C) The temperature at which dew will always form.
149.
If squalls are reported at your destination, what wind conditions should you anticipate?
A) Sudden increases in wind speed of at least 16 knots, rising to 22 knots or more, lasting for at least 1 minute.
B) Peak gusts of at least 35 knots for a sustained period of 1 minute or longer.
C) Rapid variation in wind direction of at least 20° and changes in speed of at least 10 knots between peaks and lulls.
150.
Where does wind shear occur?
A) Exclusively in thunderstorms.
B) Wherever there is an abrupt decrease in pressure and/or temperature.
C) With either a wind shift or a wind speed gradient at any level in the atmosphere.
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