What are relays?

What will be an ideal response?


Relays are electromechanical switches that contain auxiliary contacts.

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A Class D fire extinguisher is intended for use on _____.

a. burning metals b. flammable liquids c. trash fires d. electrical fires

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Explain what can be done during the rough-in phase to make switch installation easier in the finish phase of the wiring process.

What will be an ideal response?

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Who led the Red Army during the Russian civil wars?

a. V. I. Lenin b. Alexander Kerensky c. Joseph Stalin d. Leon Trotsky

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Of the following metals often found in sewage sludge, which would most likely become toxic to farmers' crops if sludge applications exceeded the recommended amounts?

A) Hg B) Cr C) Cd D) Cu E) Pb

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