161 The suffix "nimbus " used in naming clouds, means
O a rain cloud.
O a cloud with extensive vertical development.
O a middle cloud containing ice pellets.
O a cloud with extensive horizontal development
162 .The boundary between two, different air masses is referred to as a
O front.
O frontolysis.
O frontogenesis.
O occlusion
163 . One of the most easily recognized discontinuities across a front is
O a change in temperature.
O an increase in cloud coverage.
O an increase in relative humidity.
O an increase in precipitation
164 . One weather phenomenon which will always occur when flying across a front is a change in the
O wind direction.
O type of precipitation.
O stability of the air mass.
O type of clouds
165 Steady precipitation preceding a front is an indication of
O stratiform clouds with little or no turbulence
O stratiform clouds with moderate turbulence.
O cumuliform clouds with little or no turbulence.
O cumuliform clouds with moderate turbulence
166 . If the temperature/dewpoint spread is small and decreasing, and the temperature is 16°C, what type weather is most likely to develop?
O Fog or low clouds.
O Freezing precipitation.
O Thunderstorms.
O Fair weather and good visibility
167 What types of fog depend upon wind in order to exist? [Fig.16]
O Advection fog and upslope fog.
O Radiation fog and ice fog,.
O Steam fog and ground fog.
O Frontal fog
168 What clouds have the greatest turbulence?
O Cumulonimbus.
O Towering cumulus.
O Nimbostratus.
O Altocumulus
169 Where does wind shear occur?
O At all altitudes, in all directions
O Only at higher altitudes.
O Only at lower altitudes.
O In the vicinity of mountains
170 One in-flight condition necessary for structural icing to form is
O visible moisture.
O small temperature/dewpoint spread.
O stratiform clouds.
O temperature below 0?C
171 Why is frost considered hazardous to flight?
O Frost spoils the smooth flow of air over the wings, thereby decreasing lifting capability
O Frost changes the basic aerodynamic shape of the airfoils, thereby decreasing lift.
O Frost slows the airflow over the airfoils, thereby increasing control effectiveness.
O Frost increases the weight of the aircraft
172 The conditions necessary for the formation of cumulonimbus clouds are a lifting action and
O unstable, moist air.
O unstable air containing an excess of condensation nuclei.
O either stable or unstable air.
O stable, moist air
173 . During the life cycle of a thunderstorm, which stage is characterized predominately by downdrafts?
O Dissipating.
O Cumulus.
O Mature,
O All stages
174 Thunderstorms reach their greatest intensity during the
O mature and dissipating stage
O mature stage.
O dissipating stage.
O cumulus stage.
175 Thunderstorms which generally produce the most intense hazard to aircraft are
O squall line thunderstorms.
O steady-state thunderstorms.
O warm front thunderstorms.
O cold front thunderstorms
176 . A nonfrontal, narrow band of active thunderstorms that often develop ahead of a cold front is known as a
O squall line.
O prefrontal system.
O dryline.
O occlussion
177 If there is thunderstorm activity in the vicinity of an airport at which you plan to land, which hazardous atmospheric phenomenon might be expected on the landing approach?
O Wind-shear turbulence.
O Precipitation static.
O Steady rain.
O Hail
178 Which weather phenomenon is always associated with a thunderstorm?
O Lightning.
O Heavy rain.
O Hail.
O Wind shear
179 Wingtip vortices are created only when an aircraft is
O developing lift.
O operating at high airspeeds.
O heavily loaded.
O operating at low airspeeds
180 Cumulus family is designated mainly into three formal appearance, according to their size. (i) Humilis, (ii) Mediocris and (iii) Congestus. Find the correct answer.
O (i) clouds with generally flattened bases and slight vertical growth. (ii) clouds with comparable size of base and height dimensions. (iii) clouds with great vertical extend that form a distance may resemble a head of cauliflower.
O (i) clouds with comparable size of base and height dimensions. (ii) clouds with generally flattened bases and slight vertical growth. (iii) clouds with great vertical extend that form a distance may resemble a head of cauliflower
O (i) clouds with great vertical extend that form a distance may resemble a head of cauliflower (ii) clouds with generally flattened bases and slight vertical growth (iii) ) clouds with comparable size of base and height dimensions.
O None of those are correct, since this description is applicable only to stratiformi clouds.
181 . Altocumulus Castellanus are clouds that show vertical development and produce towerlike extensions often in the shape of small castles and being associated with:
O Bad weather approaching, due to high winds and instability.
O Stable weather, due they block the high cold winds.
O Fair weather, generally.
O None of those
182 . The basic scale used by the World Meteorological Organisation for the measurement of temperature is the:
O Celsius scale
O Fahrenheit scale
O Absolute scale
O Kelvin scale
183 With reference to cloud amounts, the abbreviation BKN means:
O Between 5 & 7 oktas of cloud present
O Between 3 & 4 oktas of cloud present
O Between 1 & 2 oktas of cloud present
O The information is unreliable
184 With regard to latent heat which of the following is true:
O When water changes from a vapour to a liquid latent heat is released
O When water changes from a solid to a liquid latent heat is released
O When water changes from a vapour to a solid latent heat is absorbed
O When water changes from a solid to a vapour latent heat is released
185 An aircraft flying at a constant pressure altitude flies from an area of cold mean temperature to an area of warm mean temperature in the northern hemisphere. Which of the following is correct:
O The aircraft will climb in true height
O The aircraft will drift to the left
O The aircraft will descend in true height
O The aircraft will encounter a thermal tailwind
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