CO Wind Turbine Technician Contractor
Exam Questions and Correct Answers
(Verified Answers) Plus Rationale 2027
Q&A| Instant Download Pdf
1. What is the primary function of a wind turbine’s rotor?
A. Convert electrical energy into mechanical energy
B. Store electrical energy for later use
C. Convert wind energy into rotational mechanical energy
D. Regulate utility voltage
Rationale: The rotor captures the kinetic energy of moving air through
its blades and converts that energy into rotational mechanical energy.
This rotation is then transmitted through the drivetrain or directly to
the generator.
2. Which component directly supports the wind turbine nacelle and
transfers loads to the foundation?
,A. Pitch bearing
B. Generator
C. Tower
D. Anemometer
Rationale: The tower supports the nacelle and rotor assembly and
transfers gravity, wind, and operational loads to the foundation. It
must be designed to withstand both static and dynamic loading.
3. What is the main purpose of a wind turbine’s pitch-control
system?
A. Increase tower height
B. Adjust blade angle to control aerodynamic forces and power output
C. Lubricate the main bearing
D. Convert AC power to DC power
Rationale: Pitch control changes the angle of each blade relative to
the wind. It is used to optimize energy capture at different wind
speeds and to limit rotor loading and power output during high winds.
4. Which instrument is commonly used to measure wind speed at
the nacelle?
A. Barometer
B. Hygrometer
,C. Anemometer
D. Tachometer
Rationale: An anemometer measures wind speed and provides data
used by the turbine control system. Many turbines also use a wind
vane to determine wind direction.
5. What is the primary purpose of a wind vane?
A. Measure generator temperature
B. Measure rotor speed
C. Determine wind direction
D. Measure electrical current
Rationale: A wind vane detects the direction from which the wind is
coming. The turbine controller uses this information to operate the
yaw system and orient the rotor appropriately.
6. What does the yaw system primarily accomplish?
A. Changes generator voltage
B. Adjusts hydraulic pressure
C. Orients the nacelle and rotor toward the wind
D. Controls blade lubrication
, Rationale: The yaw system rotates the nacelle around the tower axis
so that the rotor faces the incoming wind. Proper alignment improves
aerodynamic performance and helps manage turbine loads.
7. In a geared wind turbine, what is the main function of the
gearbox?
A. Convert DC to AC
B. Increase rotational speed from the rotor to the generator
C. Reduce electrical resistance
D. Store hydraulic energy
Rationale: Rotor speed is generally lower than the speed required by a
conventional generator. The gearbox increases shaft speed before
power reaches the generator.
8. What is the function of the generator in a wind turbine?
A. Convert electrical energy to wind energy
B. Control tower movement
C. Convert mechanical rotational energy into electrical energy
D. Increase blade length
Rationale: The generator uses electromagnetic principles to convert
mechanical rotation supplied by the drivetrain into electrical power.
Exam Questions and Correct Answers
(Verified Answers) Plus Rationale 2027
Q&A| Instant Download Pdf
1. What is the primary function of a wind turbine’s rotor?
A. Convert electrical energy into mechanical energy
B. Store electrical energy for later use
C. Convert wind energy into rotational mechanical energy
D. Regulate utility voltage
Rationale: The rotor captures the kinetic energy of moving air through
its blades and converts that energy into rotational mechanical energy.
This rotation is then transmitted through the drivetrain or directly to
the generator.
2. Which component directly supports the wind turbine nacelle and
transfers loads to the foundation?
,A. Pitch bearing
B. Generator
C. Tower
D. Anemometer
Rationale: The tower supports the nacelle and rotor assembly and
transfers gravity, wind, and operational loads to the foundation. It
must be designed to withstand both static and dynamic loading.
3. What is the main purpose of a wind turbine’s pitch-control
system?
A. Increase tower height
B. Adjust blade angle to control aerodynamic forces and power output
C. Lubricate the main bearing
D. Convert AC power to DC power
Rationale: Pitch control changes the angle of each blade relative to
the wind. It is used to optimize energy capture at different wind
speeds and to limit rotor loading and power output during high winds.
4. Which instrument is commonly used to measure wind speed at
the nacelle?
A. Barometer
B. Hygrometer
,C. Anemometer
D. Tachometer
Rationale: An anemometer measures wind speed and provides data
used by the turbine control system. Many turbines also use a wind
vane to determine wind direction.
5. What is the primary purpose of a wind vane?
A. Measure generator temperature
B. Measure rotor speed
C. Determine wind direction
D. Measure electrical current
Rationale: A wind vane detects the direction from which the wind is
coming. The turbine controller uses this information to operate the
yaw system and orient the rotor appropriately.
6. What does the yaw system primarily accomplish?
A. Changes generator voltage
B. Adjusts hydraulic pressure
C. Orients the nacelle and rotor toward the wind
D. Controls blade lubrication
, Rationale: The yaw system rotates the nacelle around the tower axis
so that the rotor faces the incoming wind. Proper alignment improves
aerodynamic performance and helps manage turbine loads.
7. In a geared wind turbine, what is the main function of the
gearbox?
A. Convert DC to AC
B. Increase rotational speed from the rotor to the generator
C. Reduce electrical resistance
D. Store hydraulic energy
Rationale: Rotor speed is generally lower than the speed required by a
conventional generator. The gearbox increases shaft speed before
power reaches the generator.
8. What is the function of the generator in a wind turbine?
A. Convert electrical energy to wind energy
B. Control tower movement
C. Convert mechanical rotational energy into electrical energy
D. Increase blade length
Rationale: The generator uses electromagnetic principles to convert
mechanical rotation supplied by the drivetrain into electrical power.
