CHIEF ENGINEER Unit 18 Q5

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In what environment is an obscuration type smoke detector most suitable?

A) Environments with frequent, dense smoke

B) Areas where smoke is likely to be minimal

C) Open spaces with high airflow

D) Confined spaces without ventilation

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Which type of smoke detector uses a sensor to detect light scattered by smoke particles?

C) Obscuration type

D) Thermal type

A) Light scatter type

B) Ionization type

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How does an obscuration type smoke detector detect the presence of smoke?

C) By measuring changes in air pressure

D) By analyzing the sound waves in the chamber

A) By detecting particles through heat

B) By measuring the reduction in light transmission due to smoke

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Why might a light scatter type smoke detector be more sensitive to smaller smoke particles?

D) Because it measures obscured light

C) Because it can detect even minor scattering of light by small particles

A) Because it measures temperature

B) Because it detects ionized particles

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What advantage does a light scatter type smoke detector have over an obscuration type in terms of early smoke detection?

C) It is unaffected by dust in the environment

D) It does not require a power source

B) It can detect small amounts of smoke more quickly

A) It can operate without a light source

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How does an obscuration type smoke detector determine when to activate the alarm?

C) When a set level of light reduction is reached

D) When the chamber fills with smoke

B) When the smoke particles completely block the light source

A) When the sensor detects a high enough temperature

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