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Renewable Energy Practice Test: Wind Energy Conversion Systems (WECS)

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Wind Energy Conversion Systems (WECS) convert wind energy into another form of energy, such as electricity. This energy can then be used to power homes and businesses. Wind turbines capture air flow by converting it into a rotational movement. This movement then drives a conventional generator for electricity. There are two main types of WECS: Wind turbines: Convert wind energy into electricity. Windmills: Use wind energy to pump water, mill grains, or drive machinery. How WECS work: Wind flows through the blades. The aerodynamic force drives the impeller to rotate. The impeller is... Show more

Wind Energy Conversion Systems (WECS) convert wind energy into another form of energy, such as electricity. This energy can then be used to power homes and businesses.
Wind turbines capture air flow by converting it into a rotational movement. This movement then drives a conventional generator for electricity.

There are two main types of WECS:
Wind turbines: Convert wind energy into electricity.
Windmills: Use wind energy to pump water, mill grains, or drive machinery.

How WECS work:
Wind flows through the blades.
The aerodynamic force drives the impeller to rotate.
The impeller is connected to the gearbox through the main shaft.
The generator is driven to generate electricity after acceleration through the gearbox.

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Renewable Energy Practice Test: Wind Energy Conversion Systems (WECS)

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1. What are the two types of gear boxes used in wind turbine?

VAWT and HAWTParallel shaft and planetary shaftManual transmissionDifferential

2. What is the function of grid side converter?

To control the DC-link voltageTo control generator in terms of active powerTo ensure operation at low power factorTo control generator in terms of reactive power

3. What are parallel shaft gears?

Motor shaft and the speed controller shaft are on skewed planesMotor shaft and the speed controller shaft are on diagonal planesMotor shaft and the speed controller shaft are on perpendicular planesMotor shaft and the speed controller shaft are on parallel planes

4. What is super-synchronous mode in doubly-fed induction generator (DFIG)?

Rotor runs at synchronous speedRotor runs below synchronous speedRotor takes power from AC mainsRotor runs above synchronous speed

5. Which generator is used in variable speed WECS?

Induction generatorInduction squirrelSquirrel-cage inductionDoubly-fed induction

6. What is the function of rotor side converter?

To ensure operation at large power factorTo control the DC-link voltageTo ensure operation at low power factorTo control generator in terms of active and reactive power

7. Power generation contains ________

kinetic systemsmechanical systemselectromagnetic and electrical subsystemsnuclear systems

8. Which of the following is a flowchart depicting WECS modelling?

Wind turbine aerodynamic model → generator (PMSG/DFIG) → gear train model → power gridWind turbine aerodynamic model → gear train model → power grid → generator (PMSG/DFIG)Wind turbine aerodynamic model → gear train model → generator (PMSG/DFIG) → power gridWind turbine aerodynamic model → generator (PMSG/DFIG) → power grid → gear train model

9. How is the speed varied in limited variable speed WECS?

Variable rotor resistanceVariable rotorFixed capacitanceFixed rotor resistance

10. What is a planetary shaft gearbox?

Input shaft and output shaft are alignedInput shaft and output shaft are parallelMotor shaft and the speed controller shaft are on perpendicular planesMotor shaft and the speed controller shaft are on parallel planes

11. Which of the following generators are mostly used in WECS?

DFIG and PMSGDFIG and SCIGPMSG and SCIGVAWT and HAWT

12. Which of the following is a part of a general wind energy conversion system?

Cloud UserWind turbineServerService Provider

13. Fixed speed WECS are equipped ________ generators.

doubly-fed inductioninduction squirrelsquirrel inductionsquirrel-cage induction

14. Planetary shaft gearbox is not used in large turbines.

MaybeFalseTrueDon't Know

15. What is sub-synchronous mode in doubly-fed induction generator (DFIG)?

Rotor runs below synchronous speedRotor runs above synchronous speedRotor runs at synchronous speedSlip power is fed into AC power supply

16. Which of the following components are used as converters in power electronics converter?

IGBTEarphoneWi-Fi driverBJT

17. Parallel shaft gearbox is used in small turbines.

MaybeDon't KnowFalseTrue

18. What are wind energy conversion systems designed for?

To convert wind energy to mechanical energyTo convert wind energy to potential energyTo convert mechanical energy to wind energyTo convert wind energy to electrical energy

19. _______ speed WECS is the most flexible in terms of the generator used.

Half variableFull variableLimited variableFixed

20. What is a fixed speed WECS?

WECS operating at differential speedsWECS operating at non-differential speedsWECS operating at constant speedWECS operating at variable speeds

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