Domain 3C: Physical Security Flashcards
What are the four classes of gates?
Four classes of gates:
• Class I: Residential (home use)
• Class II: Commercial/General Access (parking garage)
• Class III: Industrial/Limited Access (loading dock for 18-wheeler trucks)
• Class IV: Restricted Access (airport or prison)
How do ultrasonic and microwave motion detectors work?
Ultrasonic and microwave motion detectors work like Doppler radar used to predict the weather. A wave of energy is emitted, and the “echo” is returned when it bounces off an object.
How does a photoelectric motion sensor work?
A photoelectric motion sensor sends a beam of light across a monitored space to a photoelectric sensor. The sensor alerts when the light beam is broken.
What is the difference between a passive motion sensor and an active motion sensor?
Ultrasonic, microwave, and infrared motion sensors are active sensors, which means they actively send energy. Consider a passive sensor as a read-only device; an example is a passive infrared (PIR) sensor, which detects infrared energy created by body heat.
What are the six common types of electrical faults?
The following are common types of electrical faults: • Blackout: prolonged loss of power • Brownout: prolonged low voltage • Fault: short loss of power • Surge: prolonged high voltage • Spike: temporary high voltage • Sag: temporary low voltage
How does water supress fire?
Water suppresses fire by lowering the temperature below the kindling point, also called the ignition point
What are the six classes (US and European) of material suppression agents?
A A Ordinary combustibles such as wood and paper Water or soda acid B B Flammable Liquid B C Flammable gases C N/A Electrical equipment D D Combustible metals K F Kitchen (oil or fat) fires
What are wet pipe systems?
Wet pipes have water right up to the sprinkler heads; therefore, the pipes are “wet.” The sprinkler head contains a metal, which is common in older sprinklers, or small glass bulb designed to melt or break at a specific temperature
What are dry pipe systems?
Dry pipe systems also have closed sprinkler heads, but the difference is compressed air fills the pipes. A valve holds the water back and it will remain closed as long as sufficient air pressure remains in the pipes
What are deluge systems?
Deluge systems are similar to dry pipes, except the sprinkler heads are open and larger than dry pipe heads. The pipes are empty at normal air pressure; a deluge valve
holds the water back
What are preaction systems?
Preaction systems are a combination of wet, dry, or deluge systems and require two separate triggers to release water
Which type of fire extinguisher would you use on a metal fire?
Dry Powder Extinguishers (sodium chloride, graphite, ternary eutectic chloride). Lowers the temperature and removes oxygen in the area. Primarily used for metal fires (sodium, magnesium, graphite).
We have smoke photoelectric detectors installed in our data center. What do they detect?
Smoke Detectors: Photoelectric uses LED (Light Emitting Diode) and a photoelectric sensor that produces a small charge while receiving light. Triggers when smoke or any higher particle density interrupts the light.
We use different types of fire suppression depending on where it is and what is in that location. Which areas would it be appropriate for us to use CO2 fire suppression?
CO2: Should only be used in unmanned areas. It is colorless and odorless and causes people in it to pass out and then die. Staff working in an area of their organization where CO2 is used should be properly trained in CO2 safety.
Halon is by far the best fire suppression. It can keep hardware, employees, and our building safer by putting the fires out more efficiently. Why is it we no longer use Halon in our fire suppression systems?
It depletes the ozone layer.
