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
