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Flashcards in MET The actual progress test 01 Deck (33)
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What weather condition occurs at the altitude where the dewpoint lapse rate and the dry adiabatic lapse rate converge?

Select one:
a. Stable air changes to unstable air.
b. Cloud bases form. Correct
c. Precipitation starts.
d. Unstable air changes into stable air.



What can be said about isobars?

Select one:
a. Isobars appear on meteorological surface charts. Correct
b. Certain information can be depicted with the isobars on upper level charts.
c. Isobars show wind speeds around a jet stream area.
d. Isobars are lines of equal temperature.



The environmental lapse rate is less than 1° C/100m

Select one:
a. True altitude to be higher than Indicated altitude. Correct
b. True altitude to be the decreasing.
c. True altitude to be the same as Indicated altitude.
d. True altitude to be lower than Indicated altitude.



After landing at an aerodrome (QNH 993hPa) it is noticed that the altimeter is still set to 1013.2hPa and that it reads 1200ft. What is the elevation of the aerodrome above mean sea level?

Select one:
a. 700ft
b. 1200ft
c. 660ft Correct
d. 2280ft



A layer is absolutely unstable if the temperature decrease with height is

Select one:
a. 0.65°C per 100m
b. between 1°C per 100m and 0.65°C per 100m
c. less than 0.65°C per 100m
d. more than 1°C per 100m



The heat energy used to change water vapour into liquid water:

Select one:
a. is released to the atmosphere as latent heat. Incorrect
b. is then stored in the water vapour as latent heat.
c. modifies the DALR to the SALR.
d. is passed to the surface from which the water is evaporating.



The atmosphere is heated primarily by:

Select one:
a. earth bound electromagnetic radiation.
b. shortwave terrestrial radiation from the earth.
c. the suns insolation.
d. long wave terrestrial radiation released by the earth.



A sample of moist but unsaturated air may become saturated by

Select one:
a. compressing it adiabatically
b. lowering the pressure, keeping temperature constant
c. raising the temperature
d. expanding it adiabatically



When the upper part of a layer of warm air is advected:

Select one:
a. wind will back with increase in height in the Northern Hemisphere.
b. stability increases within the layer. Incorrect
c. stability decreases within the layer.
d. wind speed will always decrease with increase in height in the Northern Hemisphere.


Crappy question, memorize


In a layer of air the decrease in temperature per 100 metres increase in height is more than 1°C. This layer can be described as being

Select one:
a. absolutely stable
b. conditionally stable
c. absolutely unstable Correct
d. conditionally unstable



Density altitude:

Select one:
a. may be found on the navigation computer by setting outside air temperature against pressure altitude in the altitude window. Incorrect
b. is the altitude in the standard atmosphere to which the observed density corresponds.
c. is the altitude shown on the altimeter when 1013 mb is set on the sub-scale.
d. increases with a decrease in temperature compared with ISA.



Which of the following statements concerning the lifting of a parcel of air is correct?

Select one:
a. Unsaturated parcels cool less rapidly than saturated parcels
b. Unsaturated parcels cool at a rate of 0.65°C per 100m
c. Saturated parcels always cool at a rate of 0.65°C per 100m
d. Unsaturated parcels cool more rapidly than saturated parcels



Relative humidity...

Select one:
a. does not change when water vapour is added provided the temperature of the air remains constant
b. is not affected by temperature changes of the air
c. is not affected when air is ascending or descending
d. changes when water vapour is added, even though the temperature remains constant



If a saturated air mass descends down a slope its temperature increases at

Select one:
a. a lower rate than in dry air, as evaporation absorbs heat Correct
b. the same rate as if the air mass were dry
c. a higher rate than in dry air, as it gives up latent evaporation heat
d. a lower rate than in dry air, as condensation gives out heat



At which average height can the 500 hPa pressure level in moderate latitudes be expected?

Select one:
a. 12,0 km AMSL.
b. 3,0 km AMSL.
c. 5,5 km AMSL. Correct
d. 9,0 km AMSL.



The tropopause is lower

Select one:
a. south of the equator than north of it
b. over the North Pole than over the equator Correct
c. in summer than winter in moderate latitudes
d. over the equator than over the South Pole



If in a 100m thick layer the temperature at the bottom of the layer is 10°C and at the top of the layer is 8°C then this layer is

Select one:
a. absolutely stable Incorrect
b. neutral
c. conditionally unstable
d. absolutely unstable



In order to calculate QFE from QNH, which of the following must be known?

Select one:
a. Elevation at the airfield Correct
b. Temperature at the airfield
c. Elevation of the airfield and the temperature at MSL
d. Elevation and the temperature at the airfield



An inversion is :

Select one:
a. a layer that can be either stable or unstable
b. an absolutely stable layer Correct
c. an unstable layer
d. a conditionally unstable layer



Half the mass of the atmosphere is found in the first

Select one:
a. 3km
b. 5km Correct
c. 11km
d. 8km



During a flight at FL100 from Marseille (QNH 1012hPa) to Palma de Mallorca (QNH 1015hPa), an aircraft remains at a constant true altitude. The reason for this is that:

Select one:
a. one of the two QNH values may be incorrect
b. the air at Marseille is colder than that at Palma de Mallorca
c. the air at Marseille is warmer than that at Palma de Mallorca Correct
d. the altimeters are errouneous, and need to be tested



An inversion is a layer of air which is

Select one:
a. conditionally stable
b. conditionally unstable
c. absolutely unstable
d. absolutely stable



In temperature latitudes what weather conditions maybe expected over land during the summer in the centre of a stationary high pressure zone?

Select one:
a. CB, TS
b. Calm winds, haze Correct
c. NS
d. TS, SH



The diurnal variation in temperature is largest when the sky is

Select one:
a. overcast and winds are strong
b. clear and winds are strong
c. clear and winds are weak Correct
d. overcast and winds are weak



How can the stability of the atmosphere be determined?

Select one:
a. Surface pressure.
b. Atmospheric pressure at various levels.
c. Surface temperature/dewpoint spread.
d. Ambient temperature lapse rate.



A 300hPa pressure altitude level can vary in height.In temperate regions which of the following average heights is applicable?

Select one:
a. FL300 Correct
b. FL50
c. FL100
d. FL390



State the definition for QFF:

Select one:
a. QFE reduced to MSL, using actual temperature gradient. Correct
b. QNE reduced to MSL, using standard temperature gradient.
c. QNH reduced to MSL, using standard temperature gradient.
d. QFE reduced to MSL, using standard temperature gradient.



The average value of the ELR is
Select one:
a. 3,0° C / 1.000 ft
b. 2,0° C / 1.000 ft
c. it varies daily. Incorrect
d. 1,5° C / 1.000 ft



What is the primary cause of all changes in the Earths weather?

Select one:
a. Variation of solar energy at the Earths surface. Correct
b. Movement of air masses from moist areas to dry areas.
c. Changes in air pressure over the Earths surface.
d. None of the above



While flying at FL 120, you notice an OAT of -2° C. At which altitude do you expect the freezing level to be?

Select one:
a. FL 110 Correct
b. FL 90
c. FL 130
d. FL 150