Practice Test Geeks(REP) Certified Renewable Energy Professional Practice Test
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Wind Power Technologies Flashcards

7 cards from real REP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Wind Power Technologies flashcards as text

  1. What is the Weibull distribution used for in wind energy analysis?

    Answer: Statistically describing the frequency distribution of wind speeds at a site

    The Weibull distribution is the standard statistical model used to characterize the probability distribution of wind speeds at a given location for energy yield assessments.

  2. Direct-drive wind turbines eliminate which major component compared to conventional turbines?

    Answer: The gearbox

    Direct-drive turbines connect the rotor shaft directly to a low-speed generator, eliminating the gearbox and its associated maintenance requirements and failure modes.

  3. Which IEC wind turbine class designation indicates the highest wind speed design environment?

    Answer: IEC Class I

    IEC Class I turbines are designed for high-wind sites with average wind speeds up to 10 m/s, while Class III covers lower-wind sites up to 7.5 m/s average.

  4. What phenomenon causes the 'three-per-revolution' (3P) excitation in a three-bladed wind turbine?

    Answer: Each blade passing the tower once per revolution, creating periodic loading

    Each of the three blades passes the tower once per revolution, creating three structural load pulses per revolution known as 3P excitation.

  5. What is the primary advantage of variable-speed wind turbines over fixed-speed designs?

    Answer: Ability to operate at optimal tip-speed ratio across a wider wind range

    Variable-speed turbines adjust rotor speed to maintain optimal tip-speed ratio as wind speed changes, capturing more energy across a broader range of wind conditions.

  6. In wind resource assessment, what does P90 production estimate mean?

    Answer: There is a 90% probability that actual production will meet or exceed this value

    P90 is a conservative energy yield estimate with a 90% probability of exceedance, commonly used by lenders to assess financial risk in wind projects.

  7. What is the purpose of a SCADA system in a wind farm?

    Answer: Real-time monitoring, data collection, and remote control of turbines

    SCADA (Supervisory Control and Data Acquisition) systems provide operators with real-time turbine performance data, alarms, and remote control capabilities across the wind farm.