General CirculationAviation Meteorology — DGCA CPL practice questions
Question 1 of 27
The polewards moving air piles up in the subtropical regions and forms high pressure belt at the surface, it is called
All 27 questions — General Circulation
Aviation Meteorology · DGCA CPL. The correct option is marked on each.
Q1. The polewards moving air piles up in the subtropical regions and forms high pressure belt at the surface, it is called
- A.Subtropical high✓
- B.Polar High
- C.Equatorial high
Why: Poleward-drifting upper air converges/sinks near 30 deg forming the subtropical high belt.
Q2. ________ occurs over subtropical high.
- A.advection
- B.convection
- C.subsidence✓
Why: Subtropical highs are regions of large-scale sinking air.
Q3. The occurrence of large deserts near 30N and 30S are due to large scale
- A.advection
- B.convection
- C.subsidence✓
Why: Descending dry subsiding air of the subtropical highs produces the great deserts near 30 deg.
Q4. A part of the sinking air over the subtropical highs flows towards the equator, turning west (in the northern hemisphere) due to the Coriolis force. This surface air is called
- A.Trade winds✓
- B.Westerlies
- C.Doldrums
Why: Equatorward surface flow deflected west forms the trade winds.
Q5. The huge vertical circulations, one between the equator and 30N and another between equator and 30S, are called
- A.Hadley Cells✓
- B.Ferrel Cells
- C.Polar cells
Why: The equator-to-30 deg meridional overturning cells are the Hadley cells.
Q6. Descending branch of the Hadley cell marked by calm winds and high pressure at the surface are called
- A.Tropical Latitudes
- B.Middle latitudes
- C.Horse Latitudes✓
Why: Calm, high-pressure subsidence zone near 30 deg is termed the horse latitudes.
Q7. The winds in the upper troposphere in the equatorial regions are
- A.Westerlies
- B.Easterlies✓
- C.Zonal Westerlies
Why: The upper-tropospheric flow of the equatorial belt is easterly.
Q8. The disturbances of middle latitudes move from
- A.Easterly direction
- B.Westerly direction✓
- C.Southerly direction
Why: Mid-latitude systems are steered by the prevailing westerlies, moving from west to east.
Q9. The tropical disturbance which form in the equatorial low pressure belt move in a
- A.Easterly direction
- B.Westerly direction✓
- C.Northerly direction
Why: Tropical disturbances are carried westward by the low-latitude easterlies.
Q10. Latitudinally, on the average there is radiation ………… in the tropics than in the polar regions.
- A.surplus✓
- B.deficit
- C.balance
Why: Tropics receive more insolation than they radiate, giving a net radiation surplus.
Q11. The systems like highs, lows, cyclonic and anticyclonic circulations etc. are associated with distinct types of weather. A study of the behaviour of these systems, known as
- A.Synoptic Meteorology✓
- B.Climatology
- C.Physical Meteorology
Why: Study of weather systems from synoptic charts is synoptic meteorology.
Q12. Steady NE winds in the N hemisphere and SE winds in the S hemisphere are called
- A.Easterly winds
- B.Trade Winds✓
- C.Tropical Winds
Why: NE and SE steady surface winds toward the equator are the trade winds; removed stray 'Q13.' OCR fragment.
Q13. The polewards moving air piles up in the subtropical regions and forms high pressure belt at the surface, called
- A.Subtropical high✓
- B.Polar High
- C.Equatorial high
Why: Poleward upper air piling up near 30 deg forms the subtropical high belt.
Q14. The descending branch of the Hadley cell marked by calm winds and high pressure at the surface are called
- A.Tropical Latitudes
- B.Middle latitudes
- C.Horse Latitudes✓
Why: The calm, high-pressure descending zone near 30 deg is the horse latitudes.
Q15. The winds in the upper troposphere are westerly. These are known as
- A.Natural Westerlies
- B.Steady Westerlies
- C.Zonal Westerlies✓
Why: The broad upper-tropospheric west-to-east flow is termed the zonal westerlies.
Q16. The tropical disturbances which form in the equatorial low pressure belt move in a
- A.Easterly direction
- B.Westerly direction✓
- C.Southerly direction
Why: Equatorial-belt disturbances are carried westward by the easterlies.
Q17. The systems like highs, lows, cyclonic circulation etc are associated with distinct types of weather. A study of the behaviour of these systems, known as
- A.Synoptic Meteorology✓
- B.Climatology
- C.Physical Meteorology
Why: Study of behaviour of weather systems on synoptic charts is synoptic meteorology.
Q18. Rising air creates calms or doldrums in the equatorial region.
- A.ITCZ
- B.Horse Latitudes
- C.Equatorial Doldrums✓
Why: Rising air and light winds along the equatorial low form the equatorial doldrums.
Q19. For nonscheduled National Flights an advance notice (before ETD) is required to be given to AMOs
- A.3 hr✓
- B.18-24 hr
- C.6 hr
Why: Advance notice to an Aerodrome Met Office for a non-scheduled national flight is 3 hours; fixed garbled '1824 hr' to '18-24 hr'.
Q20. For nonscheduled National Flights an advance notice (before ETD) is required to be given to AMSs
- A.3 hr
- B.18-24 hr
- C.6 hr✓
Why: Advance notice to an Aeronautical Met Station for a non-scheduled national flight is 6 hours; fixed garbled '1824 hr' to '18-24 hr'.
Q21. WAFS (World Area Forecast System) provides high quality enroute forecasts of …... to Met Offices
- A.winds and temperature✓
- B.SIGMET
- C.TREND
Why: WAFS supplies gridded en-route upper winds and temperature forecasts; repaired duplicated/garbled option-1 text.
Q22. In AIREP the Met Information is contained in Section
- A.1
- B.2
- C.3✓
Why: In an AIREP the meteorological data is carried in Section 3.
Q23. Local Forecast covers an area
- A.50 NM✓
- B.100 NM
- C.150 NM
Why: A local forecast covers the aerodrome vicinity within about 50 NM.
Q24. Airfield warning is issued for expected wind speed
- A.30 kt✓
- B.24 kt
- C.15 kt
Why: An aerodrome warning for strong surface wind is issued at a threshold of about 30 kt.
Q25. Wind Shear Warning is issued for the observed or expected wind shear above runway
- A.up to 500 m✓
- B.above 500 m
- C.300 m
Why: Wind shear warnings cover shear in the layer from the runway up to about 500 m.
Q26. VOLMET Radio Telephony Broadcast made on HF Channel from
- A.Mumbai only
- B.Kolkata only
- C.both✓
Why: HF VOLMET broadcasts in the region are made from both Mumbai and Kolkata.
Q27. SIG Weather Charts are issued .... times a day
- A.Two
- B.Three
- C.Four✓
Why: Global significant-weather charts are issued four times a day; removed appended stray station-model reference text from option 3.