Title: M4L1 Quiz
Course: WIND 100WH Introduction to Wind Energy > Section: WIND 100WH Introduction to Wind Energy

Q: An ac voltage source’s __________ and __________ is illustrated by a sine wave.
- intensity, polarity
- value, position
- amplitude, resistance
- angle, temperature
A: intensity, polarity

Q: An ac voltage source (as with a generator or power plant) is constantly varying in intensity and changing polarity and is usually at a
constant ___________.
- frequency
- resistance
- temperature
- voltage
- voltage and frequency
- temperature and resistance
- none of the above
A: voltage and frequency

Q: The illustration above shows the resultant waveform of a/n _____ voltage source.
- ac
- DC
A: ac

Q: Unlike batteries that produce and voltage by chemical means and have a fixed DC polarity, ac sources use induction to force
electrons to move within a conductor.
- True
- False
A: True

Q: Homes utilize ____ voltage sources.
- ac
- DC
- magnetic
- depolarized
A: ac

Q: Inductance within a coil will only occur if the coil is within a ____________ magnetic field.
- changing
- constant
- weak
- polar
A: changing

Q: A changing magnetic field best induces ________________ into coiled conductor.
- electromotive force (emf)
- temperature
- valence shells
- None of the above
A: electromotive force (emf)

Q: A fixed, non-changing _____ magnetic field can induce emf into a coiled conductor.
- can
- cannot
A: cannot

Q: _________ are used to produce voltages as they intensify the strength of the induced emf.
- Coils
- Magnets
- Voltage transients
- Reactor systems
A: Coils

Q: A/n ____ generator delivers power to a single divided commutator.
- DC
- ac
- RC
- LC
A: DC

Q: A/n ____ generator delivers power from each end of its coil to separate commutators.
- DC
- ac
- RC
- LC
A: ac

Q: A permanent magnet or an energized electromagnetic coil act as the magnetic field source

within a generator.
- True
- False
A: True

Q: With ac induction, the _____________ within the coil are forced to move down the wire in

one direction, then reverse direction, and so on.
- electrons
- photons
- positrons
- protons
A: electrons

Q: With ac induction, electrons within the coil and any attached devices never gain electrons

from the magnetic field source; rather the electrons are manipulated by the magnetic field to flow, thus producing emf.
- True
- False
A: True

Q: The voltage produced by an ac generator with a single coil turning at 3,600 rpm within a

single magnetic field would have output frequency of ____________________.
- 60Hz
- 10Hz
- 3600Hz
- 216kHz
A: 60Hz