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    the term upwind stream means the direction of wind flow from

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    UPWIND AND DOWNWIND DEFINED

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    UPWIND AND DOWNWIND DEFINED

    METEOROLOGIST JEFF HABYIt is easy to confuse the words upwind (upstream) and downwind (downstream). Suppose you are driving from the West toward the East. From your current position on the road, West is upstream and East is downstream. In forecasting, reference to upstream and downstream is important when describing the wind flow associated with the jet stream or explaining the trajectory of air along a trough or ridge. A way to remember the difference between the terms is to remember the word downstairs. Both downwind and downstairs lead you to your destination.

    In meteorology, a wind direction is the direction the wind is coming from. For example, a Northwest wind is a wind flowing from Northwest toward Southeast. Upwind is the direction the wind is coming from. If the wind is blowing from the Northwest (blowing toward the Southeast) then the upwind direction is toward the Northwest and the downwind direction is toward the Southeast. In other words, if a person is moving upwind then they are moving against the wind and if a person is moving downwind they are moving with the wind.

    The entrance sector is the "upstream sector" and the exit sector is the "downstream sector". These terms are often used when flow is described through a vort lobe or a jet streak.

    स्रोत : www.theweatherprediction.com

    MCQs of Wind Energy (Renewable Energy Engineering

    No aside layout examples

    MCQs of 

    Showing 51 to 60 out of 81 Questions

    3 4 5 6 7 8

    51.

    On what does the selection of supporting structure depends?

    (a) Length of blades

    (b) Rotating capacity

    (c) Capacity of generator

    (d) Transmission systems

    52.

    At what type of location vibrations are less in the wind turbines?

    (a) Windward (b) Leeward

    (c) Downwind location

    (d) Upwind Location

    53.

    The term upwind stream means the direction of wind flow from

    (a) blade to tail vane

    (b) tail vane to blade

    (c) tail vane to axis

    (d) none of the above

    54.

    Pitch of the blade is controlled by rotating it from its

    (a) root (b) base (c) side

    (d) all of the above

    55.

    Why blade velocity of wind turbine varies?

    (a) Due to varying wind speeds

    (b) Long length of blades

    (c) Due to the height of mount

    (d) Because of hotness of Sun

    56.

    In wind turbine as tip speed ratio increases then number of blades

    (a) increases (b) increases

    (c) remains constant

    (d) none of the above

    57.

    A two blade wind turbine produces maximum power when the tip- speed ratio is equal to

    (a) π (b) 2π (c) 3π (d) 0.593

    58.

    How much ideal efficiency should practical turbine have?

    (a) 10 – 12% (b) 18 – 25% (c) 80 – 90% (d) 50 – 70%

    59.

    How many types are acting on propeller type wind mill?

    (a) 2 (b) 3 (c) 4 (d) 5

    60.

    Name the windmill which has four blades mounted on a central post.

    (a) post mill (b) smock mill (c) tower mill (d) fan mill

    Showing 51 to 60 out of 81 Questions

    3 4 5 6 7 8

    स्रोत : gtu-mcq.com

    UPWIND

    upwind definition: 1. in the direction from which the wind is blowing: 2. in the direction from which the wind is…. Learn more.

    Meaning of upwind in English

    upwind

    adverb [ before noun ], adjective

    UK /ˌʌpˈwɪnd/ US /ˌʌpˈwɪnd/

    in the direction from which the wind is blowing:

    Stay upwind of the fumes if you can.

    Opposite

    downwind

    SMART Vocabulary: related words and phrases

    Wind & winds air pocket airstream anemometer blast blowy breeze chinook dust devil hurricane jet stream northeast prevailing sirocco sou'wester the Coriolis effect tornado weathercock westerly wind gauge windless See more results »

    (Definition of upwind from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

    upwind | AMERICAN DICTIONARY

    upwind adjective, adverb US /ˌʌpˈwɪnd/

    in the direction from which the wind is blowing:

    Stay upwind of the fumes if you can.

    (Definition of upwind from the Cambridge Academic Content Dictionary © Cambridge University Press)

    EXAMPLES of upwind

    upwind

    When required, carbon dioxide was released (2 1 min"1) from a position e l m upwind of the target.

    From the Cambridge English Corpus

    To ensure the upwind edge of the block was treated, the first spray run was 200 m upwind of the block.

    From the Cambridge English Corpus

    The upwind-biased schemes removed excessive energy from roughly three-quarters of the resolved wavenumber range owing to inherent numerical dissipation.

    From the Cambridge English Corpus

    For example, many can be expected to travel upwind to pats, perhaps like tsetse moving upwind to hosts.

    From the Cambridge English Corpus

    The use of the forward difference + in this new sink term is deliberate; we bias this difference to preserve the upwind nature of the scheme.

    From the Cambridge English Corpus

    The general experience seems to be however that upwind techniques compare unfavourably with centred approximations with respect to accuracy.

    From the Cambridge English Corpus

    Upwind approximations of the vorticity transport would solve the problem, but with a loss of accuracy.

    From the Cambridge English Corpus

    Most of the usual methods of approximation are discussed including the scheme of upwind differences.

    From the Cambridge English Corpus

    Section 3 was the upwind end from which the airflow entered the tunnel.

    From the Cambridge English Corpus

    After recording for 50 seconds the odour source was introduced at a point 3.5 m upwind of the robot.

    From the Cambridge English Corpus

    The left-hand wall-following behaviour carried it round the left-hand turn and the robot was once again following the chemical upwind.

    From the Cambridge English Corpus

    This control experiment investigates whether an algorithm incorporating precise odor packet location information is more efficient than a blind upwind surging behavior.

    From the Cambridge English Corpus

    A tendency for upwind movement could produce this effect if an additional behaviour discouraged flies from leaving a canopy.

    From the Cambridge English Corpus

    A 100 mm grid visible beneath the observation area divided into seven equal rows, with row 7 being at the upwind end.

    From the Cambridge English Corpus

    If wrong boundary values are supplied, the introduced errors will decrease exponentially upwind from this boundary.

    From the Cambridge English Corpus

    These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.

    Translations of upwind

    in Chinese (Traditional)

    在上風處(地), 逆風(地),頂風(地)…

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    in Chinese (Simplified)

    在上风处(地), 逆风(地),顶风(地)…

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    What is the pronunciation of upwind?

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    upwardly mobile upwards upwards of upwelling BETA upwind ur- uracil BETA uranium Uranus

    स्रोत : dictionary.cambridge.org

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