ENGR403 - Fire Engineering Exam - Daniel Nilsson Notes Questions and Correct Answers
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Course
ENGR403
Institution
ENGR403
ENGR403 - Fire Engineering Exam - Daniel
Nilsson Notes Questions and Correct
AnswersENGR403 - Fire Engineering Exam - Daniel
Nilsson Notes Questions and Correct
AnswersENGR403 - Fire Engineering Exam - Daniel
Nilsson Notes Questions and Correct
AnswersENGR403 - Fire Engineering Exam - D...
ENGR403 - Fire Engineering Exam - Daniel
Nilsson Notes Questions and Correct
Answers
Fire safety system definition
✓ ~~~ System that activates in case of fire
3 types of Fire safety systems
✓ ~~~ Detection
Suppression
Smoke Management
3 ways a fire can be discovered
✓ ~~~ Radiation
Gases, aerosols, heat
Sound
What are the 3 types of radiation and which ones are useful?
✓ ~~~ Ultraviolet - useful
Visible - not useful (visible light from non-fires can flicker e.g. static TV)
Infrared - useful
4 types of smoke detectors
✓ ~~~ Point detector (slow but cheap)
Line detector (covers more area than point)
Volume detector (detector sees fire)
Aspirating detector (air is piped out and detected)
Explain how an ionisation chamber smoke detector works
✓ ~~~ - two plates in a circuit, one positive and one negative
- no current between plates so include radioactive material (Am-241) to ionise the air
(creates charged particles between the charged plates) and creates a current
- when soot enters the chamber, because it has static electricity, as it goes through,
it picks up the charged particles and therefore reduces the current
- when the current is reduced to a certain level, the detector will activate
- being phased out because it uses a nuclear material
Explain how a photoelectric smoke detector works
✓ ~~~ - Emitter shoots light to a light trap (if there is nothing in the chamber)
- if there are soot particles in the chamber, some light particles will bounce off and hit
the receiver
- if there is enough light going into the receiver, the detector will activate
Explain how a Linear beam smoke detector works
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