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78. a. It is preferred to deter attacks against property, whether criminal or not. If not deterred, access to selected areas or properties should be denied. If not denied, attacks that occur should be detected. If not detected in time, attacks should be delayed to allow time for response by authorities.

79. How are fires that involve energized electrical equipment rated?

a. Class A fires

b. Class B fires

c. Class C fires

d. Class D fires

79. c. A classification of fires is based on the nature of the combustibles, relating directly to the efficacy of extinguishing agents. Four classes are described as follows:

Class A: Fires involving ordinary combustible solids (e.g., wood, cloth, paper, rubber, and many plastics)

Class B: Fires involving flammable or combustible liquids and flammable gases

Class C: Fires involving energized electrical equipment

Class D: Fires involving certain combustible materials such as magnesium and sodium

80. A device or devices that sense(s) vibration or motion is (are) called:

a. Proximity detector and vibration detector

b. Seismic detector and vibration detector

c. Proximity detector and seismic detector

d. Intrusion detector and vibration detector

80. b. A seismic detector is a device that senses vibration or motion and thereby senses a physical attack upon an object or structure. A vibration detector is the same as a seismic detector. A proximity detector is a device that initiates a signal (alarm) when a person or object comes near the protected object. An intrusion detector is a device designed to detect an individual crossing a line or entering an area.

81. Which of the following represents the upper end of the protection scale against electrical problems (e.g., sags) in a computer center?

a. Battery backup

b. Power filters

c. Power conditioners

d. Uninterruptible power supply

81. d. The order of the protection scale from the lower end to upper end is as follows: battery backup, power filters, power conditioners, and uninterruptible power supply (UPS). Battery backup has a short life (that is, low-end protection) compared to the UPS (which is high-end protection). Power filters filter the sags, spikes, and impulse noises. Power conditioners regulate the voltage into the system. A UPS can clean up most of the power problems such as spikes, surges, sags, brownouts, blackouts, frequency variations, transient noises, and impulse hits.

82. Which of the following pairs of items create a conflicting situation in a computer center?

a. Fire-resistant file cabinets, vital records

b. Sprinkler systems, water damage

c. Fire detection systems, alarms

d. Furniture and equipment, noncombustible materials

82. b. Sprinkler systems are desirable if the computer room construction contains combustible materials. Although sprinklers extinguish fire, extensive water can damage some areas and materials in the room due to use of the sprinkler system. Therefore, sprinkler systems and water damage create a conflicting situation.

Fire-resistant file cabinets and vital records have no conflict because vital records should be stored in a fire-resistant cabinet file. Fire detection systems and alarms have no conflict because fire detection and extinguishing systems should have alarms to signal trouble and to communicate problems to a specific location that is always manned. Furniture and equipment and noncombustible materials have no conflict because furniture and equipment in a computer room should be constructed of metal or other noncombustible material.

83. What is the least important factor to be considered when selecting an uninterruptible power system (UPS)?

a. Fuel options

b. Electrical load

c. Battery duration

d. Physical space

83. a. The selection of an uninterruptible power system (UPS) is governed by three factors: electrical load, battery duration, and physical space. The electrical load represents the capacity for the UPS to supply power to the equipment properly. The battery duration is simply how long the UPS is supposed to support the equipment. Physical space is required for any UPS. Fuel options, whether to use diesel or natural gasoline, can be considered at a later point in the decision-making process.

84. Which of the following is a proper control in a computer room?

a. Smoke detection equipment shuts down the wet-pipe equipment.

b. Smoke detection equipment shuts down the air conditioning equipment.