Upgrade to remove ads
Fire Alarm Lesson 3
Terms in this set (32)
Water level switches are a(n) ? initiating device.
Which of the following devices is used to directly detect flames?
Radiant energy-sensing fire detector
Supervisory signal-initiating devices indicate a(n) ? .
off-normal suppression system
Which of the following is a supervisory signal-initiating device?
Room temperature switch
Vane- (paddle-) type switches are a(n) ? initiating device.
Ionization-type smoke detectors use ? as a means of detecting smoke particles.
Smoke detectors that detect smoke by reflecting light from smoke particles onto a sensor are called ? smoke detectors.
The most appropriate type of detection for a smoldering fire is a(n) ? .
photoelectric-type smoke detector
Ionization-type smoke detectors are best suited to detect smoke particles having a size ? in diameter.
less than one micron
A smoke detector that has a laser particle counter is best suited for ? .
Which type of smoke detector works best in large open areas?
Rate-of-rise heat detectors usually operate when the temperature rise is ? per minute.
The time difference between the ceiling temperature and the sensing element reaching the same temperature is called ? .
Total coverage is ? .
defined by NFPA 72 but required by building codes
Total coverage includes inaccessible combustible areas.
Wall-mounted spot-type heat detectors are installed so that the top of the detector is ? from the ceiling.
Ceiling-mounted spot-type heat detectors are installed so that the edge of the detector is at least ? from the wall.
Heat detectors should be selected to operate at least ? above the maximum expected ambient temperature in the protected space.
It is permitted to install smoke detectors in an ambient temperature of 115°F.
Waterflow switches are permitted to have a time delay, or retard, up to ? .
NFPA 72 does not permit smoke detector spacing to exceed a nominal ? on smooth and level ceilings.
For level nonsmooth ceilings, Section 188.8.131.52.4.2(1) of NFPA 72 permits the smooth ceiling spacing of spot-type smoke detectors for beams or joists with depths up to ? of the ceiling height.
Heat detectors located on a smooth ceiling that is 19 feet in height must be reduced by ? of their listed spacing.
On a sloping ceiling, beams run up the slope and are 14 inches deep. The average ceiling height is 15 feet. According to NFPA 72, the smoke detector spacing should be ? .
smooth ceiling spacing
Valve supervisory initiating devices must initiate a supervisory signal within ? revolution(s) of the hand wheel, or ? of the travel distance of the valve.
2 / 1/5
Pressure supervisory switches must indicate ? from nominal pressure.
Vane- (paddle-) type waterflow switches can only be used on what type of system?
Wet pipe sprinkler systems
The spacing of heat detectors on ceilings with joists is generally reduced by ? .
1/2 in the direction perpendicular to the joists
A smoke detector is required in each beam pocket where the beam depths are greater than ? of ceiling height and the width between beams is equal to or greater than ? of the ceiling height.
10% / 40%
Concealed fire detectors more than ? above the finished floor must have a remote indicator.
A room that is 40 feet by 65 feet with a 10-foot-high joisted ceiling will be protected with heat detection. The joists are 12 inches deep and run in the 40-foot direction. The engineer specified heat detectors with a 50-foot listed spacing. How many heat detectors are required for this room?
A room that is 45 feet by 65 feet, with a 19-foot-high smooth ceiling will be protected with heat detection. The engineer specified heat detectors with a 30-foot listed spacing. How many heat detectors are required for this room?
Sets found in the same folder
Fire Alarm Ch. 7
Fire Alarm Ch. 2
Sets with similar terms
FFII Ch. 16
Fire Alarm Final Exam
FIRE 100 Chapter 7
nicet level 1 questions
Other sets by this creator
3rd year previous year final
4th year tests
Other Quizlet sets
Constitutional Law - UH Professor Turner
Exercise Science Accumulative Final
Michael McGuire WWII Flashcards