1 Choose the appropriate answer(s). a. Check all statements that apply (points can only be obtained if all boxes are checked correctly) Wind power (a) ...is uncertain (True) (False) (b) ...is intermittent (True) (False) (c) ...is random (True) (False) (d) ...can be forecasted (True) (False) b. If everything else remains constant, when a significant load is added to the system the generator rotating speed (a) Slows down and as a result the torque needs to be increased to keep the frequency (b) Speeds up and the resulting torque can be used to produce more energy (c) Speeds up and the turbine must slow down the generator to prevent damage c. The Hellmann formula describes (a) solar irradiance depending on the thickness of the cloud cover. (b) the failure rate of power transmission lines depending on their length. (c) wind speed depending on height above ground. (d) the peak-to-average rate of load in a distribution feeder depending on average load. d. An asynchronous generator can normally be started (a) Off-line (must be disconnected from the grid) (b) On-line (must be connected to the grid) (c) Both of the above e. Electric ovens are mostly (a) resistive (b) capacitive (c) inductive (d) both a and c
Q: 1 Choose the appropriate answer(s).
a. Check all statements that apply (points can only be obtained if all boxes are checked correctly)
Wind power
(a) ...is uncertain (True) (False)
(b) ...is intermittent (True) (False)
(c) ...is random (True) (False)
(d) ...can be forecasted (True) (False)
b. If everything else remains constant, when a significant load is added to the system the generator rotating speed
(a) Slows down and as a result the torque needs to be increased to keep the frequency
(b) Speeds up and the resulting torque can be used to produce more energy
(c) Speeds up and the turbine must slow down the generator to prevent damage
c. The Hellmann formula describes
(a) solar irradiance depending on the thickness of the cloud cover.
(b) the failure rate of power transmission lines depending on their length. (c) wind speed depending on height above ground.
(d) the peak-to-average rate of load in a distribution feeder depending on average load.
d. An asynchronous generator can normally be started
(a) Off-line (must be disconnected from the grid)
(b) On-line (must be connected to the grid)
(c) Both of the above
e. Electric ovens are mostly
(a) resistive
(b) capacitive
(c) inductive
(d) both a and c
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