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Pre-Employment Electrician Lab > Alarm Systems And Smoke Alarms 030104h > Flashcards

Alarm Systems And Smoke Alarms 030104h Flashcards

1
Q

What are the common types of perimeter sensing devices?

Objective 1 Page 3 - 10

A

Magnetic Reed Switches
Roller Ball Contact Switches
Window Screen Contacts
Glass Break Detectors

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2
Q

What are the two types of Magnetic reed switches?

Objective 1 Page 4

A

Surface mount (usually for sealed windows.)

Recessed (Usually for doors and higher security areas.)

Are inexpensive to produce and have a life cycle of up to 10 million operations.

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3
Q

What kind of switch is used for overhead doors and why?

Objective 1 Page 5

A

Larger size magnetic reed contacts.

Overhead doors have less accurate alignment due to flexible weather stripping so they require stronger magnet sensors.

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4
Q

What can happen if the magnet for a switch is not installed properly?

Objective 1 Page 6

A

May cause false alarms since the switch will be very sensitive to any movement.

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5
Q

What are the two reasons roller ball switches are not very popular anymore?

Objective 1 Page 7

A

Costs more to produce them.

More susceptible to dirt infiltration which causes them to fail more frequently.

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6
Q

What are the two ways a window screen protector will sense an intruder?

Objective 1 Page 8

A

If the screen is removed, magnetic reed contacts will open.

If the screen is cut, parallel wires will also be cut and break the alarm circuit.

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7
Q

What are the types of glass break sensors?

Objective 1 Page 8 - 10

A

Shock detectors

Acoustic sound pattern detector

Dual sensor that combines both.

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8
Q

How do shock detectors work and where are they mounted?

Objective 1 Page 8 & 9

A

Senses rapid change in air pressure when a window is broken.

Mounted on the glass pane.

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9
Q

How do Acoustic Sound Pattern Detectors (Shatter Switch) work?

Objective 1 Page 9

A

Programmed with glass breaking sound and is always listening for that sound pattern.

Should be mounted pointing at the glass they are protecting.

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10
Q

How many wires does a dual technology glass break sensor require?

Objective 1 Page 10

A

4 Wires Total.

2 wires(black & red) supply dc power.

2 wires(green & yellow) control signalling.

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11
Q

What are some examples of internal sensing devices?

Objective 1 Page 11 & 12

A

Microwave Motion detector (Does not use heat. Act similar to a radar.)

Passive Infrared Detector (Uses heat)

Dual or Triple Hit Passive Infrared Detectors.

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12
Q

What locations will wireless detectors not work very well?

Objective 1 Page 12

A

Anywhere that may block the transmitting signals like a chimney or metal duct.

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13
Q

What is the CPU for in a security system?

Objective 2 Page 14

A

Central processing unit.

Is the brain of the system. Operates on extra-low voltage and has a battery backup.

Can be programmed to control each zone in a location differently.

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14
Q

What are the three types of zone loops?

Objective 2 Page 15

A

Normally Open loop

Normally Closed Loop

Monitored Loop (Supervised)

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15
Q

What is the most common zone loop type?

Objective 2 Page 15

A

Monitored Loop

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16
Q

How does a monitored loop work?

Objective 2 Page 15

A

Utilizes an end of line resistor that has a small current going through it. A break in the circuit by tampering or faulty wire will send a trouble signal back to the CPU.

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17
Q

What are the types of signalling devices?

Objective 2 Page 16

A

Audible (Sirens, Bell)

Visual (Strobe Lights)

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18
Q

What voltage do residential alarm systems generally operate at?

Objective 2 Page 17

A

They are considered a class 2 circuit and operate at 6 to 12 V.

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19
Q

What two locations are common for Sirens to be installed in?

Objective 2 Page 17

A

Cold Air Returns

Attic Spaces.

Both have the ability to resonate the sound.

20
Q

What are the two types of smoke alarms?

Objective 3 Page 19

A

Ionization Type (Product of Combustion Detector)

Photoelectric or Light Obscuration Type.

21
Q

What are ionization type smoke alarms best for?

Objective 3 Page 20

A

Flaming fires.

22
Q

What are photoelectric type smoke alarms best for?

Objective 3 Page 20

A

Smoldering fires

23
Q

What locations are smoke alarms installed in?

Objective 3 Page 21

A

On each floor on or near the ceiling.

In each sleeping room.

In hallways outside sleeping rooms.

Between bedrooms and rest of the floor.

24
Q

What regulates the installation of smoke alarms in dwelling units including location and interconnection?

Objective 3 Page 21

A

Alberta Building Code.

25
Q

What three things are required for smoke alarms when installed?

Objective 3 Page 22

A

Wired permanently with no disconnect means between the smoke alarm and circuit breaker.

Provided with a backup battery that can maintain normal condition for 7 days followed by a 4 minute alarm condition.

Interconnected so that if one alarm is triggered the others will be set off as well.

Wireless interconnection of smoke alarms meets Alberta Building Code requirements.

26
Q

How many wires does each smoke alarm need?

Objective 3 Page 22

A

Three.
Black and White for power.

Another coloured wire as a traveler for communication.

27
Q

How does one smoke alarm communicate with the others when an alarm condition occurs?

Objective 3 Page 22

A

9V signal is sent through the traveller to other interconnected devices.

28
Q

Can a smoke alarm be on a circuit with a GFCI?

Objective 3 Page 22

A

Yes as long as they have a backup battery.

29
Q

Should smoke alarms be wired to normal lighting circuits?

Objective 3 Page 22

A

Yes.

If wired with circuits that if tripped off it would be noticed is a good safety practice.

30
Q

What are the three components of a basic fire alarm system?

Objective 4 Page 26

A

Fire Alarm Control Panel

Manual Pull Station

Audible Signal Device

31
Q

What are the four conditions a fire alarm system can be in?

Objective 4 Page 27

A

Normal (low current)

Trouble (no current)

Alarm (high current)

Supervisory.

32
Q

What is the only condition that cannot be cleared at the panel?

Objective 4 Page 27

A

Supervisory.

33
Q

Why must each conductor within a fire alarm system be independently terminated?

Objective 4 Page 28

A

To ensure that any time a terminal or splice is opened, the supervisory current is interrupted and a trouble signal is sent to the control panel.

34
Q

What organization sets the standards for smoke alarms in Canada?

Objective 3 Page 20

A

Underwriters Laboratory

35
Q

How long must the back up battery in a smoke alarm operate for?

Objective 3 Page 22

A

normal condition for 7 days followed by a 4 minute alarm condition.

36
Q

What are the two categories of devices forming part of a fire alarm system?

A

Initiating and Signalling devices.

37
Q

What type of circuit are residential alarms considered to be part of?

Objective 2 Page 17

A

Class 2

38
Q

What types of circuits can conventional field devices be connected in?

Objective 4 Page 28

A

Either Class A or Class B

39
Q

What is a disadvantage of a class b circuit in a trouble condition?

Objective 4 Page 29

A

All devices downstream of break are inactive.

40
Q

What condition will a panel show if there is a short circuit in the initiating loop/detection circuit?

Objective 4 Page 29

A

Alarm condition.

41
Q

What condition will occur in a fire alarm system if a short circuit occurs in a N.A.C./Signal Circuit?

Objective 4 Page 29

A

Trouble Condition.

42
Q

What will cause a supervisory condition in a fire alarm system?

Objective 4 Page 27

A

Operation of a sprinkler gate valve.

43
Q

What is the purpose of electrical supervision?

Objective 4 Page 28

A

To monitor all field wiring past the panel and monitor for trouble and alarm conditions.

44
Q

What are magnetic reed switches housed in?

Objective 1 Page 3

A

A vacuum tube.

Makes it unaffected by arcingand moisture.

45
Q

What condition will the panel register if an open path occurs in the detection or signal circuit?

Objective 4 Page 29

A

Trouble Condition.

Pre-Employment Electrician Lab (8 decks)

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