Vayudoot Aviation

1. A Secondary low pressure system rotates around a Primary low

At a constant distance

Into the primary

Cyclonically

Anticyclonically.

2. A Secondary Depression would form in association with

A Polar Front Low

A Summer Thermal Depression over the Mediterranean or Caspian Sea.

A Col

A Polar Depression

3. Tropical Revolving Storms

Regenerate after crossing the coast from sea to land

Have internal wind speeds of 10-20 knots rotating cyclonically round a subsiding clear air core known as the eye

Are always given a male first name beginning with “A” for the first of the season and thereafter named in alphabetical order of occurrence

Usually have the most severe weather in the quadrant to the right of the track in a Hurricane

4. Tropical Revolving Storms

Occur principally in spring and early summer.

Generally move from east to west before turning towards the equator.

Intensify after crossing coasts.

Do not occur in the South Atlantic.

5. Extensive cloud and precipitation is often associated with a non-frontal thermal depression because of

Surface divergence and upper level convergence causing widespread descent of air in the depression

Surface divergence and upper level convergence causing widespread ascent of air in the depression

Surface convergence and upper level divergence causing widespread descent of air in the depression

Surface convergence and upper level divergence causing widespread ascent of air in the depression

6. With reference to tropical revolving storms, which of the following statements is correct

cyclones, occur in the Bay of Bengal in winter

hurricanes affect the south east of the USA in late summer

hurricanes, in the South Atlantic sometimes affect the east coast of Brazil

typhoons are found in the South China sea in January

7. Which of the following statements accurately describes the “West African Tornado”

the West African Tornado is similar to the North American and European tornadoes

it is another name for the cyclones that affect the West African coast in summer

it is the name given to a line of thunderstorms that lie along the ITCZ but some 200 miles to the south

it is a line of thunderstorms producing a line squall aligned roughly north/south

8. Flying conditions in a Secondary low pressure system are

Relatively calm

Always more severe than in a Primary low

Sometimes more severe than in a Primary low

Less severe than in a Primary low

9. In comparison with a primary depression a secondary depression is

Sometimes more active

Never more active

Unlikely to produce gale force winds

Always more active

10. Which of the following are Thermal Depressions

The lows forming over flat land in summer, polar air depressions, tropical revolving storms, some of the lows which form over inland seas in winter

The equatorial trough, monsoon lows, some depressions over the central and eastern Mediterranean sea in summer

The equatorial trough, polar air depressions, monsoon lows, orographic lows

Tropical revolving storms, polar air depressions, tornadoes

11. Tropical revolving storms usually

move in an easterly direction before re-curving towards the nearest pole

do not form within 5° of the equator

move in a westerly direction before re-curving towards the equator

form close to one side of the equator and while moving slowly in a westerly direction, cross over to the other hemisphere

12. A thermal depression is likely to form

in association with a marked trough of low pressure over the USA

over the Iberian peninsular during the summer

on the trailing edge of a warm sector mid latitude depression

in the lee of the Alps over Northern Italy in winter

Question Bank

Questions for DEPRESSIONS