Jet Streams Flashcards
The arbitrary lower limit of jet core velocity has been assigned by WMO as
> (a) 60 kt
(b) 60 m\s
(c) 70 m/s
Jet stream has
(a) one maxima
>(b) one or more maxima
(c) only two maxima
The vertical wind shear in a Jet stream is about
> (a) 5m/s/km
(b) 6m/s/km
(c) 8m/s/km
Compared to horizontal wind shear the vertical wind shear in a Jet stream is
(a) weaker
>(b) stronger
(c) same
In a jet stream, the path of the maximum speed is known as
(a) Core
>(b) Axis
(c) Jet streak
The wind speed along the axis of a jet stream is always
(a) Uniform
(b) Not uniform
(a) Uniform
>(b) Not uniform
Along the axis of a jet stream there are centres of high speed winds, these are called
> (a) Jet streaks
(b) Core
(c) Axis
In a wavy jet the Jet streaks are located over or near the
> (a) Ridge
(b) Trough
(c) Between Trough and Ridge
Sub-tropical Jet Stream (STJ) is
> (a)Westerly
(b) Easterly
(c) Southerly
The normal position of Sub-tropical Jet Stream is
(a) 30°N
>(b) 27°N
(c) 35°N
The southern most position of STJ is in February is
> (a) 22°N
(b) 20°N
(c) 18°N
The STJ affects India from
(a) Jun to Jul
>(b) Oct to May
(c) Aug to Sep
STJ has a layered structure. There are often two layers of max wind to the …….. of jet core
> (a) S
(b) N
(c) SW
The STJ strengthens
(a) Northwards
(b) Upstream
>(c) Downstream
At and near the STJ the temperature gradient is very
> (a) Small
(b) Large
(c) Moderate
Vertical wind shear in STJ is greater ……. the core
> (a) above
(b) below
(c) along
The TJ prevails over the Indian Peninsula from
(a) May to Jun
(b) Sep to Oct
>(c) Jun to Aug
The TJ is located over the Indian Peninsula, approximately at
> (a)13°N
(b) 17°N
(c) 18°N
The TJ is located over Indian, approximately at a height of
> (a) 15-16 km
(b) 12-13 km
(c) 11-12 km
The TJ is strongest in
> (a) July — Aug
(b) Sep - Oct
(c) June
In the TJ the wind shears are much …….. than the STJ
(a) more
>(b) less
(c) same
TJ is
(a) Westerly
(b) Easterly
(c) Southerly
(a) Westerly
>(b) Easterly
(c) Southerly
A jet stream can be recognized by
(a)High level dust
(b) High Pressure
>(c) Streaks of CI
(d) Lenticular clouds
Flying at right angles to a jet stream with falling pressure you will experience
> (a) Wind from left
(b) Increasing head wind
(c) Increasing tail wind
(d) Wind from right
When and where tropical jet stream occurs
(a) All year along equator
(b) In Middle East in summers
(c) In winters over Russia
>(d) In summers over SE Asia and Central Africa
