S95 - Supervision of Fire Alarm System Alarm Initiating Devices Questions and Answers

Question 1

A photoelectric smoke detector is most effective at detecting which type of fire?

Accepted Answer

A slow, smoldering fire that produces a large amount of smoke.

Answer

A fire involving flammable liquids that spreads rapidly.

Answer

A fire in a commercial kitchen with high ambient temperatures.

Answer

A fire that causes a rapid increase in temperature with little to no smoke.

Question 2

In a commercial building, what is the primary function of a duct smoke detector?

Accepted Answer

To shut down the HVAC system and prevent the spread of smoke throughout the building.

Answer

To extinguish a fire within the HVAC ductwork using a suppression agent.

Answer

To measure the airflow velocity within the HVAC system for efficiency.

Answer

To activate the building's sprinkler system in the immediate vicinity of the ductwork.

Question 3

Which of the following is a requirement for the installation of manual fire alarm pull stations according to NFPA 72?

Accepted Answer

They must be located within 5 feet (60 inches) of the entrance to each exit.

Answer

The operable part must be mounted between 54 and 60 inches above the finished floor.

Answer

They must be painted yellow for high visibility in smoky conditions.

Answer

The travel distance to the nearest station must not exceed 300 feet.

Question 4

A rate-of-rise heat detector is designed to activate when:

Accepted Answer

The temperature increases by a specified number of degrees per minute.

Answer

The ambient temperature reaches a fixed-point, such as 135°F.

Answer

The detector senses the specific infrared signature of flames.

Answer

Humidity in the protected area drops below a certain percentage.

Question 5

In a dusty industrial environment, such as a woodworking shop, which type of automatic initiating device would be most appropriate to minimize nuisance alarms?

Accepted Answer

Heat detector

Answer

Ionization smoke detector

Answer

Photoelectric beam detector

Answer

Air-aspirating smoke detector

Question 6

An ionization smoke detector is generally more responsive than a photoelectric detector to:

Accepted Answer

Fast, flaming fires with small, invisible combustion particles.

Answer

Slow, smoldering fires with large smoke particles.

Answer

Fires that are producing dense, dark smoke.

Answer

Fires that are primarily generating heat with minimal smoke.