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CPL Test Series
Question Bank
Questions for TURBULENCE 1
Answer the following questions
Test Mode
Training Mode
1. Low level vertical wind shear can be expected during the night
and early morning only in winter
in association with radiation inversions
in unstable atmospheres
and early morning only in summer
2. In which zone of a jet stream is the strongest CAT to be expected?
Exactly in the centre of the core.
The cold air side of the core
Exactly in the centre of the core.
The warm air side of the core.
3. Fallstreaks or virga are?
strong katabatic winds in mountainous areas and accompanied by heavy precipitation
water or ice particles falling out of a cloud that evaporate before reaching the ground
strong downdraughts in the polar jet stream, associated with jet streaks
gusts associated with a well developed Bora
4. Which degree of aircraft turbulence is determined by the following ICAO description? “There may be moderate changes in aircraft attitude and/or altitude but the aircraft remains in positive control at all times. Usually, small variations in air speed. Changes in accelerometer readings of 0.5 to 1.0 g at the aircraft’s enter of gravity. Occupants feel strain against seat belts. Loose objects move about. Food service and walking is difficult.”
Violent.
Moderate.
Severe
Light.
5. A wide body aircraft takes off on a clear night in Dhahran, Saudi Arabia. Shortly after take off the aircraft’s rate of climb drops to zero. This can be due to
sand/dust in the engines
a very strong temperature inversion
low relative humidity
very pronounced downdrafts
6. Which of the following conditions are most favourable to the formation of mountain waves?
Either stable or unstable air at mountain top and a wind of at least 30 knots blowing parallel to the mountain ridge.
Moist unstable air at mountain top and wind of less than 5 knots blowing across the mountain ridge.
Stable air at mountain top altitude and a wind at least 20 knots blowing across the mountain ridge.
Unstable air at mountain top altitude and a wind at least 20 knots blowing across the mountain ridge.
7. What is the effect of a strong low level inversion?
It promotes extensive vertical movement of air.
It prevents vertical windshear
It results in good visual conditions
It promotes vertical windshear.
8. Which cloud type may indicate the presence of severe turbulence?
Cirrocumulus
Nimbostratus
Stratocumulus
Altocumulus lenticularis
9. At the top of orographic waves, in mountainous regions, the cloud most likely to be encountered is
cirrus.
cirrostratus.
altocumulus lenticularis.
cumulus mediocris.
10. What units are used to report vertical wind shear?
kt/100 FT.
m/100 FT.
m/sec.
kt
11. All pilots encountering Clear Air Turbulence are requested to report it. You experience CAT which causes passengers and crew to feel definite strain against their seat belt or shoulders straps. Unsecured objects are dislodged. Food service and walking are difficult. This intensity of CAT should be reported as
extreme
moderate
light
severe
12. A flight is to depart from an airport with runways 09 and 27. Surface wind is 270/05; an inversion is reported at 300 feet with turbulence and wind shear. The wind just above the inversion is 090/30. What is the safest departure procedure?
Depart runway 27 with as steep an ascent as possible.
Depart on runway 09 with a tailwind.
Take-off is not possible under these conditions.
Depart runway 27 with maximum throttle during the passage through the inversion.
13. Which cloud type may indicate the presence of severe turbulence?
Cirrocumulus
Stratocumulus
Nimbostratus
Altocumulus lenticularis
14. On a clear summer day, turbulence caused by solar heating is most pronounced
during the early afternoon
immediately after sunset
during early morning hours before sunrise
about midmorning
15. How does moderate turbulence affect an aircraft?
Continued flight in this environment will result in structural damage.
Rapid and somewhat rhythmic bumpiness is experienced without appreciable changes in altitude or attitude
Changes in altitude or attitude occur but the aircraft remains in positive control at all times.
Large, abrupt changes in altitude or attitude occur but the aircraft may only be out of control momentarily
16. The turbulence which occurs at high flight levels (above FL 250) is mainly of the type Clear Air Turbulence. In what way can moderate to severe Clear Air Turbulence affect an aircraft, the flight and the passengers?
The turbulence is wave like which makes the flight unpleasant for the passengers but the manoeuvring will not be affected essentially
The turbulence is a small scale one and can cause damage of worn out type. The manoeuvring of the aircraft will be made more difficult or even impossible. For the passengers the flight will be unpleasant.
The turbulence is a large scale one (waving) so that the aircraft will be difficult to manoeuvre. The passengers will feel some discomfort.
The turbulence can be resembled with the roughness of a washing-board (small scale) and will not have influence on the aircraft and its solidity, but will make flight a little more difficult. The passengers will seldom notice anything of this turbulence
17. At the top of orographic waves, in mountainous regions, the cloud most likely to be encountered is
altocumulus lenticularis.
cirrostratus.
cumulus mediocris
cirrus.
18. A zone of strong convection currents is encountered during a flight. In spite of moderate gust you decide to continue the flight. What are your precautionary measures?
Increase the speed / try to descend below the zone of convective currents.
Decrease the speed / try to descend below the zone of convective currents
Increase the speed / try to climb above the zone of convective currents if aircraft performance parameters allow.
Decrease the speed / try to climb above the zone of convective currents if aircraft performance parameters allow
19. The degree of clear air turbulence experienced by an aircraft is proportional to the
intensity of vertical and horizontal windshear
height of the aircraft
stability of the air
intensity of the solar radiation
20. Vertical wind shear is
vertical variation in the horizontal wind
horizontal variation in the vertical wind
vertical variation in the vertical wind
horizontal variation in the horizontal wind
21. The presence of altocumulus lenticularis is an indication of the
presence of mountain waves
presence of valley winds
risk of orographic thunderstorms
development of thermal lows
22. Under which of the following conditions is the most severe CAT likely to be experienced?
A straight jet stream near a low pressure area
A westerly jet stream at low latitudes in the summer
A jet stream, with great spacing between the isotherms
A curved jet stream near a deep trough
23. Low level wind shear is likely to be greatest
at the top of the friction layer
at the condensation level when there is no night radiation.
at the condensation level when there is strong surface friction
at the top of a marked surface-based inversion
24. The most dangerous low level wind shears are encountered
in areas with layered clouds and wind speeds higher than 35 kt
when strong ground inversions are present and near thunderstorms
near valleys and at the windward side of mountains.
during any period when wind speed is greater than 35 kt and near valleys
25. You intend to carry out a VFR flight over the Alps, on a hot summer day, when the weather is unstable. What is the best time of day to conduct this flight?
Early evening.
Morning.
Afternoon
Mid-day.
26. What is normally the most effective measure to reduce or avoid CAT effects?
Change of course.
Decrease of speed.
Increase of speed.
Change of flight level.
27. Above and below a low level inversion the wind is likely to
change in speed but not in direction
change in direction but not in speed
experience little or no change in speed and direction
change significantly in speed and direction
28. The vertical extent of the friction layer depends primarily on
roughness of surface, temperature, local time
temperature, local time, environmental lapse rate
wind speed, roughness of surface, temperature
stability, wind speed, roughness of surface
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