Questions and Answers
In polyphase circuits, circuits or systems in which the ac sources operate at the same frequency but different phases are known as?
Multiphase
What is the connection type illustrated in the figure labeled 'Y − ∆ connection'?
Star-delta connection
What is the phase difference between the two phases in a two-phase three-wire system?
$90^{ ext{o}}$
Why did AC systems come into existence in the late 1880s?
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What problem led to the development of AC systems for use with single-phase motors?
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