Why do large synchronous generators use an exciter?
What will be an ideal response?
The magnitude of the output ac is controlled by the exciter current supplied to the field and the exciter output can easily be controlled as the load demand changes. In addition, the use of an exciter enables the main generator output to be taken from the stator, eliminating the need for slip rings and brushes in series with the output.
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Describe a digital input.
What will be an ideal response?
In which of the following types of relationships do two different types of species compete for the same
food supply, cover, or nesting or breeding sites?
a. mutualism c. parasitism b. commensalism d. competition
Explain in what way a) the Neutrality Acts of 1935, 1936, and 1937, b) the fall of France, c) Hitler's invasion of the Soviet Union, and d) the attack on Pearl Harbor mark the most important turning points in American foreign policy from "storm-cellar isolationism" to full-fledged interventionism between 1935 and 1941.
What will be an ideal response?
Units in the metric system are meters, grams, and ____________________.
Fill in the blank(s) with the appropriate word(s).