Challenge Questions PPL Sec 5.

The suffix "nimbus,'' used in naming clouds, means
A) a middle cloud containing ice pellets.
B) a cloud with extensive vertical development.
C) a rain cloud.

Question: 3416 Subject Code: I26
Clouds are divided into four families according to their
A) outward shape.
B) height range.
C) composition.

Question: 3417 Subject Code: I26
An almond or lens-shaped cloud which appears stationary, but which may contain winds of 50 knots or more, is referred to as
A) an inactive frontal cloud.
B) a lenticular cloud.
C) a funnel cloud.

Question: 3418 Subject Code: I26
Crests of standing mountain waves may be marked by stationary, lens-shaped clouds known as
A) standing lenticular clouds.
B) roll clouds.
C) mammatocumulus clouds.

Question: 3419 Subject Code: I26
What clouds have the greatest turbulence?
A) Cumulonimbus.
B) Nimbostratus.
C) Towering cumulus.

Question: 3420 Subject Code: I26
What cloud types would indicate convective turbulence?
A) Cirrus clouds.
B) Towering cumulus clouds.
C) Nimbostratus clouds.

Question: 3421 Subject Code: I27
The boundary between two different air masses is referred to as a
A) front.
B) frontolysis.
C) frontogenesis.

Question: 3422 Subject Code: I27
One of the most easily recognized discontinuities across a front is
A) an increase in cloud coverage.
B) an increase in relative humidity.
C) a change in temperature.

Question: 3423 Subject Code: I27
One weather phenomenon which will always occur when flying across a front is a change in the
A) wind direction.
B) type of precipitation.
C) stability of the air mass.

Question: 3424 Subject Code: I27
Steady precipitation preceding a front is an indication of
A) cumuliform clouds with little or no turbulence.
B) stratiform clouds with moderate turbulence.
C) stratiform clouds with little or no turbulence.

Question: 3425 Subject Code: I28
Possible mountain wave turbulence could be anticipated when winds of 40 knots or greater blow
A) down a mountain valley, and the air is unstable.
B) parallel to a mountain peak, and the air is stable.
C) across a mountain ridge, and the air is stable.

Question: 3426 Subject Code: I28
Where does wind shear occur?
A) Only at higher altitudes.
B) At all altitudes, in all directions.
C) Only at lower altitudes.

Question: 3427 Subject Code: I28
When may hazardous wind shear be expected?
A) When stable air crosses a mountain barrier where it tends to flow in layers forming lenticular clouds.
B) In areas of low-level temperature inversion, frontal zones, and clear air turbulence.
C) Following frontal passage when stratocumulus clouds form indicating mechanical mixing.

Question: 3428 Subject Code: I28
A pilot can expect a wind-shear zone in a temperature inversion whenever the windspeed at 2,000 to 4,000 feet above the surface is at least
A) 15 knots.
B) 25 knots.
C) 10 knots.

Question: 3429 Subject Code: I28
One in-flight condition necessary for structural icing to form is
A) visible moisture.
B) small temperature/dewpoint spread.
C) stratiform clouds.

Question: 3430 Subject Code: I29
In which environment is aircraft structural ice most likely to have the highest accumulation rate?
A) Cumulus clouds with below freezing temperatures.
B) Freezing drizzle.
C) Freezing rain.

Question: 3431 Subject Code: I29
Why is frost considered hazardous to flight?
A) Frost spoils the smooth flow of air over the wings, thereby decreasing lifting capability.
B) Frost changes the basic aerodynamic shape of the airfoils, thereby decreasing lift.
C) Frost slows the airflow over the airfoils, thereby increasing control effectiveness.

Question: 3432 Subject Code: I29
How does frost affect the lifting surfaces of an airplane on takeoff?
A) Frost may cause the airplane to become airborne with a lower angle of attack at a lower indicated airspeed.
B) Frost may prevent the airplane from becoming airborne at normal takeoff speed.
C) Frost will change the camber of the wing, increasing lift during takeoff.