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  2. Smoke testing (mechanical) - Wikipedia

    en.wikipedia.org/wiki/Smoke_testing_(mechanical)

    Smoke is created using either a smoke bomb or liquid smoke. Smoke bombs are lit and placed on a grate or in a holder on top of each fan, while liquid smoke is injected into the fan via a heating chamber. The fans create a pressure differential that forces the smoke into the sewer at a pressure just above atmospheric.

  3. Engine knocking - Wikipedia

    en.wikipedia.org/wiki/Engine_knocking

    In spark-ignition internal combustion engines, knocking (also knock, detonation, spark knock, pinging or pinking) occurs when combustion of some of the air/fuel mixture in the cylinder does not result from propagation of the flame front ignited by the spark plug, but when one or more pockets of air/fuel mixture explode outside the envelope of the normal combustion front.

  4. List of sensors - Wikipedia

    en.wikipedia.org/wiki/List_of_sensors

    Engine crankcase pressure sensor; ... Smoke detector; Zinc oxide nanorod sensor; ... Speed sensors are machines used to detect the speed of an object, usually a ...

  5. The Best Place to Put Your Smoke Detector (Plus 3 Spots ... - AOL

    www.aol.com/lifestyle/best-place-put-smoke...

    Proper smoke detector placement boils down to ensuring the smoke detector is in a spot where it will sense a fire and a spot where you'll hear its alarm. While any smoke detector is better than no ...

  6. Smoke detector - Wikipedia

    en.wikipedia.org/wiki/Smoke_detector

    Smoke detector mounted on a ceiling Knowing this sound could save your life - it means replace the battery. A smoke detector is a device that senses smoke, typically as an indicator of fire. Smoke detectors/Alarms are usually housed in plastic enclosures, typically shaped like a disk about 125 millimetres (5 in) in diameter and 25 millimetres ...

  7. Here's Everything You Need to Know About Smoke Alarms - AOL

    www.aol.com/heres-everything-know-smoke-alarms...

    Smoke Alarms do save lives, and you want to make sure they are working properly for the moment you might actually need them. The good news is if your smoke alarm is malfunctioning, it will let you ...

  8. Nitrogen oxide sensor - Wikipedia

    en.wikipedia.org/wiki/Nitrogen_oxide_sensor

    The term NO x represents several forms of nitrogen oxides such as NO (nitric oxide), NO 2 (nitrogen dioxide) and N 2 O (nitrous oxide, also known as laughing gas).In a gasoline engine, NO is the most common form of NO x at around 93%, while NO 2 is around 5% and the rest is N 2 O.

  9. Smoke - Wikipedia

    en.wikipedia.org/wiki/Smoke

    Ionization chamber type smoke detectors detect particles of combustion that are invisible to the naked eye. This explains why they may frequently false alarm from the fumes emitted from the red-hot heating elements of a toaster, before the presence of visible smoke, yet they may fail to activate in the early, low-heat smoldering stage of a fire ...

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