Title: Unit 5 Quiz
Course: SGRD 105 Microgrids and Renewable Energies > Section: SGRD 105 Microgrids and Renewable Energies

Q: Wind power is proportional to
- windspeed
- windspeed squared
- windspeed cubed
- inverse windspeed
A: windspeed cubed

Q: Doubling turbine blade diameter changes the power available by a factor of
- 4
- 2
- 1/2
- 1/4
A: 4

Q: Compute the power delivered to an area of 2.00 m2 by 24 hrs of 8.00 m/s wind.
- 39.2 W
- 78.4 W
- 264 W
- 397 W
A: 78.4 W

Q: Frictional effects cause windspeed to
- vary randomly with height
- remain the same with height
- decrease with height
- increase with height
A: increase with height

Q: Modern wind turbines have a rotor efficiency of
- 59.3 %
- 40 - 50 %
- 10 - 20 %
- 100 %
A: 40 - 50 %

Q: If the windspeed at height h0 = 10.0 m above cropland (β = 0.2) is 8.0 m/s, find the windspeed at height 100.0 m
- 12.7 m/s
- 80.0 m/s
- 1.5 m/s
- 20.1 m/s
A: 12.7 m/s

Q: A 20.0 m diameter turbine operates with a TSR of 6.0 in a wind of 8.0 m/s. The blade tip speed is
- 120 m/s
- 48 m/s
- 160 m/s
- 8.0 m/s
A: 48 m/s

Q: The total installed wind power capacity in the U.S. is
- 6 MW
- 100 MW
- 60 MW
- 2 MW
A: 60 MW

Q: The power produced by a generator depends on
- length of armature coil
- magnetic field strength
- rate of motion between field and armature
- all of the above
A: all of the above

Q: When and the shaft of and induction machine rotates faster than the synchronous speed it operates as a
- motor
- generator
- transformer
- capacitor
A: generator