Give an overview of alternator control.
What will be an ideal response?
Alternators are often used to control the speed of several induction motors that require the same change in speed, such as motors on a conveyer line. The alternator is turned by a direct current motor or an AC motor coupled to an eddy current clutch. The output frequency of the alternator is determined by the speed of the rotor. The output voltage of the alternator is determined by the amount of DC excitation current applied to the rotor. Since the output voltage must change with a change of frequency, a variable voltage DC supply is used to provide excitation current. Most controls of this type employ some method of sensing alternator speed and make automatic adjustments to the excitation current.
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To ensure maximum safety in a control transformer, the secondary control circuit is _____.
a. controlled by taps b. connected to an autotransformer c. isolated from the primary line circuit d. less than 120V
Identify this component.
A) A heating coil
B) A vacuum pump
C) A vacuum motor
D) None of these
List the four types of bone in the horse and the role of each.
What will be an ideal response?
Zero emission vehicles (ZEV) _______
A) Are either electric or fuel cell powered B) Produce zero tailpipe emissions C) Both A and B D) Neither A nor B