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  2. What is a “man-trap”? What is the difference between “fail-safe” and “fail-secure” configurations in how doorways with automatic locks operate?

What is a “man-trap”? What is the difference between “fail-safe” and “fail-secure” configurations in how doorways with automatic locks operate?

1. What is a “man-trap”? What is the difference between “fail-safe” and “fail-secure” configurations in how doorways with automatic locks operate?

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2. Define the following different types of voltage fluctuations possible with electric power: spike, surge, fault, blackout, sag/dip, brownout, and in-rush current. Describe electromagnetic interference (EMI) and radio frequency interference (RFI) and discuss sources of each.

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3. Describe the differences between the four main types of water sprinkler systems used for fire suppression.

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