Who wants to enter a controlled area but has no

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who wants to enter a controlled area but has no authorization to do so. 187 What does fail open mean in the context of controlled building entrances? A. Controlled entrances permit no one to pass. B. Controlled entrances permit people to pass without identification. C. A power outage won’t affect control of the entrance. D. A pass key is required to enter the building. Answer: B See Chapter 11. Fail open refers to any controlling mechanism that remains in the unlocked position after it fails. In the case of controlled building entrances, anyone can enter the building. 188 What does fail closed mean in the context of controlled building entrances? A. Controlled entrances permit no one to pass. B. Controlled entrances permit people to pass without identification.
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C. The access control computer is down. D. Everyone is permitted to enter the building. Answer: A See Chapter 11. Fail closed refers to any controlling mechanism that remains in the locked position after it fails. In the case of controlled building entrances, no one can enter the building by normal means. 189 A water sprinkler system characterized as always having water in the pipes is known as A. Dry-pipe B. Wet-pipe C. Preaction D. Discharge Answer: B See Chapter 11. Wet-pipe is the sprinkler system type in which water is always in the pipe. 190 A water sprinkler system that charges the pipes when it receives a signal from a heat or smoke alarm, and then discharges when a higher temperature is reached, is known as A. Dry-pipe B. Wet-pipe C. Preaction D. Discharge Answer: C See Chapter 11. Preaction, a combination of dry-pipe and wet-pipe, is increasingly popular in data centers because it reduces the likelihood that a water discharge will actually occur @@md and a discharge will be limited to a small area in the data center. 191 Why would a dry-pipe sprinkler be preferred over a wet-pipe sprinkler? A. Dry-pipe systems put out a fire more quickly. B. Dry-pipe systems consume less water. C. Dry-pipe systems have a smaller likelihood of rust damage. D. Dry-pipe systems have a potentially useful time delay before water is discharged. Answer: D See Chapter 11. Dry-pipe systems take a few moments (at least) before water discharge begins. 192 How does water aid in fire suppression? A. It reduces the fire’s oxygen supply.
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B. It isolates the fire’s fuel supply. C. It lowers the temperature below what the fire needs to sustain itself. D. It extinguishes the fire through a chemical reaction. Answer: C See Chapter 11. Water cools the fuel to the point at which the fire can’t continue. Also, to some extent, water can act as a physical barrier in between the fuel and oxygen. 193 Which of the following are NOT fire detectors? A. Dial-up alarms B. Heat-sensing alarms C. Flame-sensing alarms D. Smoke-sensing alarms Answer: A See Chapter 11. Dial-up alarms don’t detect fire; they respond to a fire detector and call the fire department by using a telephone line to play a prerecorded message. 194
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