Clear Air TurbulenceAviation Meteorology — DGCA CPL practice questions
Question 1 of 5
CAT (Clear Air Turbulence) is most frequently found in which region of the atmosphere?
All 5 questions — Clear Air Turbulence
Aviation Meteorology · DGCA CPL. The correct option is marked on each.
Q1. CAT (Clear Air Turbulence) is most frequently found in which region of the atmosphere?
- A.Surface layer
- B.Near the jet streams at upper troposphere✓
- C.In the stratosphere above 50,000 ft
- D.In cumulus cloud regions
Why: CAT is generated by wind shear near jet streams at upper troposphere / tropopause.
Q2. Most CAT in India occurs on the fringes of the jet stream. The maximum frequency of CAT over North India is during
- A.July–August
- B.October–May✓
- C.June–September
- D.March–June
Why: Subtropical jet affects North India Oct–May, giving CAT its maximum frequency then.
Q3. The average horizontal dimensions of a CAT zone in India are approximately
- A.50 km N–S, 100 km E–W
- B.120 km N–S, 250 km E–W✓
- C.500 km N–S, 500 km E–W
- D.300 km N–S, 100 km E–W
Why: Standard CAT-zone dimensions over India are about 120 km N–S by 250 km E–W.
Q4. To escape from CAT, a pilot should
- A.Maintain current altitude and speed through it
- B.Turn East or West
- C.Climb/Descend or turn North or South✓
- D.Reduce speed and descend to low level
Why: CAT zones are shallow and elongated E–W; escape by changing level or turning N/S.
Q5. Severe CAT in India is most likely during
- A.June–July
- B.December–February✓
- C.March–May
- D.August–October
Why: Severe CAT accompanies the strongest subtropical jet, which peaks in winter.