Fire Alarms

Question 1

4 most common types of ignition

Answer 1

Chemical
Electrical
Mechanical
Thermal

Question 2

How dose conventional fire alarm panel operate

Answer 2

A monitoring current flows through the system when smoke is detected at a smoke head current drops activates alarm

Question 3

Two types of fire alarm systems

Answer 3

Addressable
Conventional EOL

Question 4

Advantages of addressable fire alarms

Answer 4

Simple wiring
Suitable for large buildings

Question 5

3 types of design categories in fire alarm systems

Answer 5

P
L
M

Question 6

What dose L1 represent

Answer 6

Provides automatic detection to every space

Question 7

What dose L2 represent

Answer 7

Automatic detection at escape routes and adjoining rooms and special rooms

Question 8

What dose L3 represent

Answer 8

Automatic detection for escape routes and adjoining rooms

Question 9

What dose L4 represent

Answer 9

Automatic detection of escape routes only

Question 10

What dose L5 represent

Answer 10

Installed for specific risk only

Question 11

What a are the categories of life protection

Answer 11

L1-L5

Question 12

Category’s of p property’s protection

Answer 12

P1 protects agents whole building
P2 is installed in defined parts only
Provide earliest warning of a fire

Question 13

Guidelines for zoning

Question 14

Guidelines of zoning in fire zones

Answer 14

If the total floor area of each floor of a building is less then 300m2 then the building only needs one zone

The total floor area should not exceed 2000m2

Stair wells should be on there own system

Question 15

What’s the benefit of a short circuit ioslator in fire alarm system

Answer 15

To isolate the area where the fault is so that the whole zone dosnt have to be turned off

Question 16

Name the 6 defector types

Answer 16

Ionizition smoke
optical smoke
Rate of rise heat detector
Fixed temperature heat
Carbon monoxide alarm CO2
Optical beam detector detects smoke

Question 17

What is the minimum alarm sounder dB

Answer 17

65dB or 5dB higher then any back ground noise

Question 18

What is the benefit of a diode in a conventional fire alarm system

Answer 18

Reverse biased diode prevents the flow of the monitoring current through the sounder. When a detector activates the polarity changes at the control panel forward baising the diode sounding the alarm

Question 19

What power supply does a fire alarm need and how long should it remain on battery’s

Answer 19

Two power supply’s mains 230v or batteries 12 or 24v

The battery’s should last for 30 mins on full load and 24 hours on stand by

Question 20

What are the routine tests on a fire alarm system

Answer 20

Daily visual
Weekly sounder test
Quarterly 25% of fire equipment to be tested
annualy 4 quarters test whole system tested

Question 21

List 4 locations where manual call points should be located

Answer 21

final exit
Landings of stair wells
Defined escape routes
Resection areas
Control room

Question 22

What is the max search distance in relation to call points

Answer 22

30m

Question 23

What is the most sensitive fire alarm system

Answer 23

Air sampling system

Question 24

Describe where Category M of a fire alarm can be used and what it is

Answer 24

manual system that does not use automatic detectors

Question 25

Name 3 types of smoke detectors

Answer 25

Optical smoke
Photo electric
Combine technologies

Question 26

3 considerations which influence the the choice of fire alarm detectors

Answer 26

Cost of the detector
Speed of response required
Suitable for the application