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Security Alarm Systems > Module J8: Security Systems Worksheet > Flashcards

Module J8: Security Systems Worksheet Flashcards

1
Q

What is a security system designed to do?

A

Protect property and people, and provide a feeling of security

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2
Q

What are the five items that are normally a part of a security system design?

A
  • Deterrence
  • Prevention
  • Detection
  • Response
  • Apprehension
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3
Q

What is meant by the “onion-skin” approach?

A

Successive layers of protection throughout installation

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4
Q

What three purposes does an alarm system serve?

A
  • Deterrence
  • Detection
  • Response
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5
Q

What are the three categories of protection (layers) using the onion-skin approach?

A
  • Perimeter protection
  • Space protection
  • Spot protection
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6
Q

What is provided by perimeter protection? What does perimeter protection refer too?

A

Provides early warning when intruder is still outside. Refers to devices to protect the outer perimeter of an installation

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7
Q

What is space protection designed to do?

A

Designed to detect the presence of an intruder within a volumetric area

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8
Q

What are the two advantages of space protection over perimeter protection?

A

Cost effective, less important to anticipate the point of entry

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9
Q

What is the limitation of space protection?

A
  • Does not provide early warning (intruder is already inside the premises)
  • Does not allow customer to stay inside protected area
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10
Q

What is spot detection designed to do?

A

Designed to protect a specific object or area

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11
Q

Where is spot protection usually installed?

A

Around an item of value (cash, safes, paintings, etc)

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12
Q

What are the three main circuits in a basic alarm system?

A
  • Detection circuit
  • Control circuit
  • Output circuit
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13
Q

What are the two states of operation for detection circuits?

A
  • Secure (normal)

- Insecure (alarm)

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14
Q

What is the most common output device used with a security alarm system?

A

Siren

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15
Q

What are the two basic types of detection circuits?

A
  • Closed loop

- Open loop

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16
Q

What detection circuit is the most commonly used?

A

Closed loop

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17
Q

What circuit provides better protection: a supervised or unsupervised circuit?

A

Supervised

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18
Q

What are the four basic closed loop types?

A
  • 2-wire
  • 2-wire with end-of-line (EOL) resistor
  • 4-wire
  • 4-wire ULC
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19
Q

Where are two-wire, closed loop circuits used?

A

Low security applications

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20
Q

Where should the ELR be connected in a two-wire with end of line resistor loop?

A

At the end of the loop (last device)

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21
Q

Do four-wire loop circuits provide a high or low security for window installations?

A

High

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22
Q

What advantage does the ULC four-wire loop have over a two-wire loop?

A

Provides better protection against tampering

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23
Q

Explain the basic operation of magnetic contacts for detection circuits

A

A magnetic switch is installed in a window or door, when magnet is placed next to it, it changes the state of the contact

24
Q

What are the four precautions considered when installing reed switches?

A
  • They are fragile
  • The have low current rating
  • They must be aligned properly
  • They must be kept away from metal in vicinity
25
Q

What is a PIR detector

A

Passive infrared radiation detector. Detects the presence of heat

26
Q

What is a passive detector?

A

It does not radiate any signal

27
Q

What is the component that is the heart of a passive infrared detector?

A

Pyroelectric element (PE)

28
Q

What is a detection pattern?

A

A pattern of infrared energy monitored by the detection device

29
Q

What are the five advantages of PIR detectors?

A
  • Self-adjusting
  • Foolproof (to install)
  • Passive (do not emit radiation)
  • Extremely versatile
  • Detection fingers are adjustable
30
Q

What are the three disadvantages of PIR detectors?

A
  • Normal differences in temperature can trip sensor
  • Unsupervised detection (can be blocked)
  • Range and sensitivity depends on ambient temperature
31
Q

What are two characteristics of microwave detectors?

A
  • Emit microwave radiation (active device)

- Reacts to doppler shift (change in frequency)

32
Q

What are two advantages of microwave and ultrasonic detectors over PIR detectors?

A
  • Sense motion toward the detector

- Unaffected be sources of heat

33
Q

What are three disadvantages of microwave detectors?

A
  • Sensitive to fluorescent and neon lights
  • Inability to contain the detection pattern (microwaves pass through walls)
  • Water in pipes in the detection range can cause false alarms
34
Q

What is a Dual-Technology detector?

A

A type of detector that uses 2 different sensing methods to improve reliability

35
Q

What is the main advantage of a dual-technology detector?

A

Reliability and resistance to false alarms

36
Q

Describe the basic operation of the photoelectric beam detector

A

Beam of light is emitted from transmitter and directed at the receiver. If an intruder passes through and interrupts the beam, alarm is triggered

37
Q

What is an advantage of the photo-beam detector?

A
  • Not affected by ambient conditions
  • Protects areas too hazardous for PIR
  • Good distance
38
Q

What is a disadvantage of the photo-beam detector?

A
  • Expensive to install

- Takes much longer to setup/adjust

39
Q

What are the two main types of glass-break detectors?

A
  • Audio detectors

- Shock sensors

40
Q

What is the principle of operation for an audio detector?

A

It listens to the sound of breaking glass. If the frequency of the break matches the profile of breaking glass, it triggers alarm

41
Q

What are the advantages of audio detectors?

A

Ability to protect large areas

42
Q

What are four causes of false alarms for audio detectors?

A
  • High-pitched squeaks
  • Pet stores (animal noises)
  • Metal impact/scraping
  • High volume sounds
  • Kitchen noises (broken plates, etc)
43
Q

What are shock sensors? What is the basic principle of operation of a shock sensor?

A

A unit that can detect a shock wave made by intruder. Piezoelectric crystal acts as a microphone

44
Q

What is the common number of zones that come with intrusion alarm control panels?

A

4, 8, 16

45
Q

What are the three main status LEDs found on the control panel and give a brief description of their function

A
  • Loop status LED
  • Ready status LED
  • Armed status LED
46
Q

What are three advanced features found in alarm panels/

A
  • Zone bypass
  • System trouble
  • Alarm memory
47
Q

What is a monitoring station?

A

An offsite location to which alarm panels send communication in the alarm event

48
Q

What is an “exit delay”?

A

A feature that gives a user time to exit premises without the system going into alarm

49
Q

What is a “zone bypass”?

A

Ability of the security system to bypass (or disable) some of the zones

50
Q

A four-wire loop is also called a _________ or ________

A

double circuit, HI/LO loop

51
Q

In the secure condition on a four-wire loop, there is _______ ________ ________ between the two loops

A

no current flow

52
Q

The LO loop is called a ______ loop

A

24-hour

53
Q

Where is a four-wire loop system typically found?

A

In installations using window foil

54
Q

The contacts on detection devices for four-wire ULC closed loop circuits must be ___________

A

SPDT, with C, NO and NC terminals

55
Q

Most reed switches are able to conduct currents of only ______ or less

A

250mA

Security Alarm Systems (2 decks)

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