Vayudoot Aviation

1.
The most likely reason for radiation fog to dissipate or become low stratus is

an increasingly stable atmosphere.

increasing surface wind speed.

surface cooling.

a low level temperature inversion.

2.
The presence of altocumulus castellanus indicates

subsidence in a large part of the troposphere

instability in the middle troposphere

stability in the higher troposphere

strong convection at low height

3.
Considering the North Atlantic region between 30°N and 65°N and the adjacent land areas during mid-summer, the predominant pressure systems are

weak low over NE Canada and Scandinavian high

Azores low and Icelandic high

Scandinavian high and Azores high

Azores high and weak low over NE Canada

4.
In the weather briefing room during the pre-flight phase of a passenger flight from Zurich to Rome, you examine the following weather reports of pressing importance at the time:EINN SHANNON 2808 sigmet 2 valid 0800/1100 loc sev turb fcst einn fir blw fl 050 south of 53n wkn =LIMM MILANO 2809 sigmet 2 valid 0900/1500 mod sev cat btn fl 250 and fl 430 fcst limm fir stnr nc =EGLL LONDON 2808 sigmet nr01 valid 0800/1200 for london fir isol cb embd in lyr cloud fcst tops fl 300 btn 52n and 54n east of 002e sev ice sev turb ts also fcst mov e wkn =Which decision is correct?

Because of the expected turbulence you select a flight level below FL 250.

Owing to these reports and taking into account the presence of heavy thunderstorms at planned FL 310 you select a higher flight level (FL 370).

You cancel the flight since the expected dangerous weather conditions along the route would demand too much of the passengers.

You show no further interest in these reports, since they do not concern the route to be flown.

5.
How does a pilot react to heavy freezing rain at 2000 FT/AGL, when he is unable to deice, nor land?

He ascends to the cold air layer above.

He turns back before the aircraft loses manoeuvrability

He continues to fly at the same altitude.

He descends to the warm air layer below.

6.
You are flying at FL 200. Outside air temperature is -40°C, and the pressure at sea level is 1033 hPa. What is the true altitude?

18260 feet

19340 feet

21740 feet

20660 feet

7.
What is the name of the hot, local wind, that blows downwards from mountain chains? In the Alps, for instance, it may exist both as a southerly or northerly wind depending on the weather situation

Bora.

Mistral.

Foehn.

Scirocco

8.
Which of the following cloud types is a medium level cloud ?

SC

CS

AS

ST

9.
An aircraft is flying through the Alps on a very cold winter's day. The regional QNH is 1013 hPa. During the flight, you circle around a mountain at an altitude of its summit. What reading will the aneroid altimeter give, compared to the elevation of the summit?

A higher altitude than the elevation of the summit

The same altitude as the elevation of the summit

A lower altitude than the elevation of the summit

There is insufficient information to come to a conclusion

10.
The relative humidity of a sample air mass is 50%. How is the relative humidity of this air mass influenced by changes of the amount of water vapour in it?

It is not influenced by changing water vapour.

It increases with increasing water vapour.

It is only influenced by temperature.

It decreases with increasing water vapour.

11.
At what degree of icing should ICAO's

Extreme

Moderate

Severe

Light

12.
A dry, sand- and dust-laden North Easterly wind that blows in winter over large parts of North West Africa is known as a

Pampero

Scirocco

Harmattan

Khamsin

13.
Why are indications about the height of the tropopause not essential for flight documentation in the tropics?

The meteorological services are unable to provide such a chart.

Tropopause informations are of no value.

The temperatures of the tropical tropopause are always very cold and therefore not important.

The tropopause is generally well above the flight level actually flown.

14.
A 850 hPa pressure level can vary in height. In temperate regions which of the following average heights is applicable ?

FL 300

FL 390

FL100

FL 50

15.
Which of the following statements concerning the intertropical convergence zone is true?

It lies totally in the northern hemisphere in July and totally in the southern hemisphere in January

It does not change its position over the oceans during the year

There are frequent occurrences of CB

is an area of low pressure and low relative humidity

16.
Convective activity over land in mid-latitudes is greatest in

winter during the night and early morning

summer in the afternoon

summer during the night and early morning

winter in the afternoon

17.
What is the meaning of the abbreviation ""SCT"" ?

1 - 2 oktas

1 - 4 oktas

5 - 7 oktas

3 - 4 oktas

18.
Which thunderstorms generally develop in the afternoon in summer over land in moderate latitudes?

Airmass thunderstorms

Occlusion thunderstorms

Warm front thunderstorms

Cold mass thunderstorms

19.
What are the requirements for the formation of a thunderstorm?

A cumulus cloud with sufficient moisture associated with an inversion

An adequate supply of moisture, conditional instability and a lifting action

A stratocumulus cloud with sufficient moisture

Water vapour and high pressure

20.
What is the main cause for the formation of a polar front jet stream?

The pressure difference, close to the ground, between a high over the Azores and a low over Iceland

The north-south horizontal temperature gradient at the polar front

Strong winds in the upper atmosphere

The varied elevations of the tropopause in the polar front region

21.
Which constant pressure altitude chart is standard for a 9882 FT pressure level (FL 100) ?

500 hPa

300 hPa

700 hPa

850 hPa

22.
On the European continent METARs of main airports are compiled and distributed with intervals of

0.5 hour

1 hour

3 hours

2 hours

23.
What positions are connected with contour lines on the weather chart?

Positions with the same air density.

Positions with the same thickness between two constant pressure levels.

Positions with the same wind velocity.

Positions with the same height in a chart of constant pressure.

24.
What winds are mainly associated with the winter monsoon in the monsoon regions of the Indian sub-continent ?

Southwesterly winds carrying warm and humid air.

Southeasterly winds carrying warm and humid air.

Northeasterly winds bringing dry and hazy air.

Northwesterly winds bringing dry and hazy air.

25.
If you have to fly through a warm front when freezing level is at 10000 feet in the warm air and at 2000 feet in the cold air, at which altitude is the probability of freezing rain the lowest ?

3000 feet

9000 feet

5000 feet

12000 feet

26.
When a given mass of air descends, what effect will it have on relative humidity?

It remains constant.

It decreases.

It increases up to 100%, then remains stable.

It increases.

27.
Examining the pictures, on which one of the tracks (dashed lines) is this cross-section to be expected?

Track B-D

Track A-E

Track B-C

Track A-D

28.
On the approach, the surface temperature is given as -5°C. The freezing level is at 3000 FT/AGL. At 4000 FT/AGL, there is a solid cloud layer from which rain is falling.According to the weather briefing, the clouds are due to an inversion caused by warm air sliding up and over an inclined front. Would you expect icing?

Yes, between ground level and 3000 FT/AGL.

Yes, but only between 3000 and 4000 FT/AGL.

No, absolutely no icing will occur.

No, flights clear of cloud experience no icing.

29.
What is the technical term for an increase in temperature with altitude?

Adiabatic

Subsidence

Advection

Inversion

30.
With what type of cloud is heavy precipitation unlikely during the summer months ?

AS, NS

SC, AS

CB, ST

NS, CC

31.
Which of the following phenomena are formed when a moist, stable layer of air is forced to rise against a mountain range ?

Inversions

Areas of severe turbulence

Showers and thunderstorms

Stratified clouds

32.
What type of clouds, visible even at a long distance, could indicate the presence of a tropical revolving storm?

Dense CI

Excessive accumulation of CU

NS spread over a large area

Frequent SC

33.
Which constant pressure altitude chart is standard for a 4781 FT pressure level (FL50)?

300 hPa.

700 hPa.

500 hPa

850 hPa.

34.
Which of the following statements describes a microburst ?

A high speed downdraft of air with a higher temperature than its surroundings

A small low pressure system where the wind circulates at high speed

An extremely strong wind gust associated with a tropical revolving storm

A high speed downburst of air with a generally lower temperature than its surroundings

35.
A blocking anticyclone on the northern hemisphere is

situated between 50° and 70°N/a cold anticyclone/steering depressions

quasi stationary/situated between 50°N and 70°N/a cold anticyclone

a cold anticyclone/steering depressions/situated over Scandinavia

a warm anticyclone/quasi stationary/situated between 50°N and 70°N

36.
Most strong air currents at higher levels (jet streams) have a westerly direction. There is, however, an important easterly jet stream. When and where is it likely to be encountered ?In summer from south-east Asia extending over southern India to central Africa. b)

Throughout the year to the south of the Azorian high.

In winter along the Russian coast facing the Arctic ocean.

In summer from south-east Asia extending over southern India to central Africa.

In summer from the Middle East extending over the southern part of the Mediterranean to southern Spain.

37.
Rising air cools because

contracts

it expands

it becomes more moist

surrounding air is cooler at higher levels

38.
Which one of the following statements concerning the formation of aircraft icing is most correct ?

Risk for icing increases when cloud temperature decreases well below minus 12 degrees C.

Probability of icing increases when dry snow starts to fall from a cloud.

A cloud consisting of both supercooled cloud droplets and ice crystals produces aircraft icing

Greatest risk of icing conditions is experienced in cirrus clouds.

39.
Which of the following statements concerning jet streams is correct?

In the northern hemisphere only westerly jet streams occur

In the southern hemisphere no jet streams occur

In the northern hemisphere both westerly and easterly jet streams occur

In the southern hemisphere only easterly jet streams occur

40.
Which of the following causes echoes on meteorological radar screens?

Fog

Water vapour

Any cloud

Hail

41.
The wind speed in a system with curved isobars compared to a system with straight isobars is (other conditions being the same)

higher if curvature is anticyclonic

always lower

always higher

higher if curvature is cyclonic

42.
The arrows labelled ""s"" represent the mean tracks of tropical revolving storms which occur mainly from

May to November and are called hurricanes

May to November and are called cyclones

December to April and are called typhoons

December to April and are called cyclones

43.
Which is true of a secondary depression in the northern hemisphere?

It tends to move round the primary in a cyclonic sense

It rapidly closes on, and merges with the primary

It tends to maintain its position relative to the primary

It tends to move round the primary in an anticyclonic sense

44.
Which of the following best describes the intertropical convergence zone ?

The zone where cold fronts form in the tropics.

The zone where the Harmattan meets the northeasterly trade winds over Africa.

The zone where the trade winds of the northern hemisphere meet those of the southern hemisphere.

The zone where the west winds meet the subtropical high pressure belt.

45.
Which of the following cloud types can project up into the stratosphere?

Cirrostratus

Altocumulus

Altostratus

Cumulonimbus

46.
The maximum amount of water vapour that the air can contain depends on the

dewpoint

stability of the air

relative humidity

air temperature

47.
For an aircraft what are the meteorological dangers associated with a Harmattan wind?

Thunderstorms.

Hail.

Sand up to FL 150.

Dust and poor visibility.

48.
An aircraft is descending to land under IFR. If the local QNH is 1009 hPa, what will happen to the altitude reading when the altimeter is reset at the transition level ?

It will not be affected

It will increase

It will remain the same

It will decrease

49.
Which of the following changes of state is known as sublimation?

Liquid direct to vapour

Solid direct to liquid

Solid direct to vapour

Liquid direct to solid

50.
Two aircraft, one with a sharp wing profile (S), and the other with a thick profile (T), are flying through the same cloud with same true airspeed. The cloud consists of small supercooled droplets. Which of the following statements is most correct concerning ice accretion ?

Aircraft T experiences more icing than S.

Aircraft S experiences more icing than T.

Neither of the aircraft accumulate ice due to the small size of droplets.

Aircraft S and T experience the same amount of icing

Question Bank

Questions for INDIGO METEOROLOGY(3272-4089)

The most likely reason for radiation fog to dissipate or become low stratus is

The presence of altocumulus castellanus indicates

Considering the North Atlantic region between 30°N and 65°N and the adjacent land areas during mid-summer, the predominant pressure systems are

How does a pilot react to heavy freezing rain at 2000 FT/AGL, when he is unable to deice, nor land?

You are flying at FL 200. Outside air temperature is -40°C, and the pressure at sea level is 1033 hPa. What is the true altitude?

What is the name of the hot, local wind, that blows downwards from mountain chains? In the Alps, for instance, it may exist both as a southerly or northerly wind depending on the weather situation

Which of the following cloud types is a medium level cloud ?

An aircraft is flying through the Alps on a very cold winter's day. The regional QNH is 1013 hPa. During the flight, you circle around a mountain at an altitude of its summit. What reading will the aneroid altimeter give, compared to the elevation of the summit?

The relative humidity of a sample air mass is 50%. How is the relative humidity of this air mass influenced by changes of the amount of water vapour in it?

At what degree of icing should ICAO's

A dry, sand- and dust-laden North Easterly wind that blows in winter over large parts of North West Africa is known as a

Why are indications about the height of the tropopause not essential for flight documentation in the tropics?

A 850 hPa pressure level can vary in height. In temperate regions which of the following average heights is applicable ?

Which of the following statements concerning the intertropical convergence zone is true?

Convective activity over land in mid-latitudes is greatest in

What is the meaning of the abbreviation ""SCT"" ?

Which thunderstorms generally develop in the afternoon in summer over land in moderate latitudes?

What are the requirements for the formation of a thunderstorm?

What is the main cause for the formation of a polar front jet stream?

Which constant pressure altitude chart is standard for a 9882 FT pressure level (FL 100) ?

On the European continent METARs of main airports are compiled and distributed with intervals of

What positions are connected with contour lines on the weather chart?

What winds are mainly associated with the winter monsoon in the monsoon regions of the Indian sub-continent ?

If you have to fly through a warm front when freezing level is at 10000 feet in the warm air and at 2000 feet in the cold air, at which altitude is the probability of freezing rain the lowest ?

When a given mass of air descends, what effect will it have on relative humidity?

Examining the pictures, on which one of the tracks (dashed lines) is this cross-section to be expected?

What is the technical term for an increase in temperature with altitude?

With what type of cloud is heavy precipitation unlikely during the summer months ?

Which of the following phenomena are formed when a moist, stable layer of air is forced to rise against a mountain range ?

What type of clouds, visible even at a long distance, could indicate the presence of a tropical revolving storm?

Which constant pressure altitude chart is standard for a 4781 FT pressure level (FL50)?

Which of the following statements describes a microburst ?

A blocking anticyclone on the northern hemisphere is

Most strong air currents at higher levels (jet streams) have a westerly direction. There is, however, an important easterly jet stream. When and where is it likely to be encountered ?In summer from south-east Asia extending over southern India to central Africa. b)

Rising air cools because

Which one of the following statements concerning the formation of aircraft icing is most correct ?

Which of the following statements concerning jet streams is correct?

Which of the following causes echoes on meteorological radar screens?

The wind speed in a system with curved isobars compared to a system with straight isobars is (other conditions being the same)

The arrows labelled ""s"" represent the mean tracks of tropical revolving storms which occur mainly from

Which is true of a secondary depression in the northern hemisphere?

Which of the following best describes the intertropical convergence zone ?

Which of the following cloud types can project up into the stratosphere?

The maximum amount of water vapour that the air can contain depends on the

For an aircraft what are the meteorological dangers associated with a Harmattan wind?

An aircraft is descending to land under IFR. If the local QNH is 1009 hPa, what will happen to the altitude reading when the altimeter is reset at the transition level ?

Which of the following changes of state is known as sublimation?

Two aircraft, one with a sharp wing profile (S), and the other with a thick profile (T), are flying through the same cloud with same true airspeed. The cloud consists of small supercooled droplets. Which of the following statements is most correct concerning ice accretion ?