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49 Cards in this Set
- Front
- Back
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What are used to ensure clean and smooth distribution of power? They absorb spike and regulate sags.
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Power line conditioners or voltage regulators
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What causes disturbance to the flow of electric power while it travels across power line? Interrupted by things that create radio waves like flourescent lighting
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Radio frequency interference (RFI)
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What is the presence of electrical radiation in the system that interferes with distribution of clean power?
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Noise
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What are the two types of EMI?
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Common Mode noise - the generation of radiation due to charge differences between the hot and ground wires (hint: common - ground)
Traverse Mode Noise - the generation of radiation due to charge differences between the hot and neutral wires |
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What is the Momentary loss of power?
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Fault
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What is the complete loss of power?
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Blackout
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What is the Momentary low voltage?
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Sag
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What is the Prolonged low voltage?
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Brownout
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What is the Momentary high voltage?
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Spike
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What is prolonged high voltage?
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Surge
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What is an initial surge of power?
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Inrush
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What is steady interference?
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Noise
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What is a short duration of line noise?
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Transient
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What is Non-fluctuating power?
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Clean
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What do you call it if power is disrupted, doors default to being unlocked?
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Fail Safe
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What do you call it if in a power disruption, door default to being locked?
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Fail Secure
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What are the high level types of fire suppression?
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1. Heat sensing – detects one of two things:
* Temperature reaches specified level (less false positives) * Temperature rises quickly 2. Flame Actuated – fairly expensive * Sense infrared energy of flame or pulsation of the flame 3. Smoke Actuated – two types * Photoelectric devices triggered by variation in light hitting photoelectric cells * Radioactive device goes off when ionization current is created by radioactive reaction to smoke |
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What is a Class A Fire?
Type of Fire Elements of Fire Supression Method |
Common combustibles
Wood products, paper laminates Water, foam |
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What is a Class B Fire?
Type of Fire Elements of Fire Supression Method |
Liquid
Petroleum products and coolants Gas, CO2, foam, dry powders |
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What is a Class C Fire?
Type of Fire Elements of Fire Supression Method |
Electrical
Electrical equipment and wires Gas, CO2, dry powders |
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What is a Class D Fire?
Type of Fire Elements of Fire Supression Method |
Combustible metals
Magnesium, sodium, potassium Dry powder |
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How does water supress a fire?
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suppresses temperature required to sustain fire
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How does soda ash supress a fire?
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suppressed the fuel
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How does CO2 supress a fire?
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Suppresses the oxygen
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How does Halon supress a fire?
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suppresses through chemical reaction that kills the fire
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Describe a wet pipe sprinkler.
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Sprinkler always contain water
At 165 F - fusible link in nozzle melts Most reliable Subject to leaking and freezing |
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Describe a dry pipe sprinkler
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No water standing in the pipe
Air is blown out and water is released Time delay can allow systems to power down |
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Describe a deluge sprinkler
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Dry pipe system
Large Volume of Water Not good for computer equipment |
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Describe a preaction sprinkler
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Most recommended for computer room
Combines wet and dry Charges pipe when heat is detected Releases water when fusible link in nozzle melts |
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What is a warded lock?
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basic padlock - hanging lock with a key
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Describe a tumbler lock
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Contains more pieces than a ward lock. cylinder slot
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What is a grade 1 lock used for?
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Commercial and industrial use
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What is a grade 2 lock used for?
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Heavy duty residential and light duty commercial
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What is a grade 3 lock used for?
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Residential/ consumer expendable
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What is a Class I gate used for?
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Residential use
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What is a Class II gate used for?
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Commercial use where general public is expected
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What is a Class III gate used for?
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Industrial use - where access is expected like a warehouse
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What is a Class IV gate used for?
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Restricted access. Includes prisons
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In CCTV, what does short focal length give?
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wide angle view
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In CCTV, what does the iris control?
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amount of light the camera receives
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Describe a photoelectric sensor (alarm)
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Receive beam of light from light emitter
Can be visible light, white light or infrared Alarm sounds if beam is broken Can be avoided if seen Invisible Infrared is often used Employing substitute light source can fool sensor |
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Describe a dry contact switches (alarm)
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Most common
Metallic foil tape on windows and doors Easy and cheap |
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Describe 3 kinds of motion detectors.
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Wave Pattern
* Generate frequency wave pattern * Sound alarm if disturbed * Can be low frequency, ultrasonic, or microwave Capacitance * Monitor electrical field surrounding object * Spot protections within a few inches of the object * Not for entire room * Penetration of field changes capacitance Audio Detectors * Passive, no generation of fields * Simply monitor room for abnormal noise * High number of false positives |
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What are the recommendations for humidity levels?
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40%-60%
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What are the recommendations for temperature levels?
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70-74 degrees 21-23 C
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At what point does heat damage Computer hardware?
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175F (80c)
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At what point does heat damage Magnetic Storage?
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100F (37c)
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At what point does heat damage paper?
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350 (176c)
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Behavior based systems are also know as....?
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Profile based
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