the difference between fail-safe and fail-secure configurations in how doorways with automatic locks operate
Please use any necessary references to adequately answer the questions below
1. What is a “man-trap”? What is the difference between “fail-safe” and “fail-secure” configurations in how doorways with automatic locks operate?
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.
3. Describe the differences between the four main types of water sprinkler systems used for fire suppression.