Fire Alarm CH 3

Question 1

pressure supervisory switches must indicate _______ from nominal preassure

Answer 1

10 psi

Question 2

ionization-type smoke detectors are best suited to detect smoke particles having a size ______ in diameter

Answer 2

1 micton

Question 3

ceiling mounted spot type heat detectors are installed so that the edge of the detector is at least _____ from the wall

Answer 3

4 inches

Question 4

a smoke detector that has a laser particle counter is best suited for _________.

Answer 4

clean rooms

Question 5

for level non smooth ceilings section 17.7.3.2.4.2(1) of NFPA 72 permits the smooth ceiling spacing of spot-type smoke detectors for beans or joists with depth up to _______ of the ceiling height

Answer 5

10 percent

Question 6

Ionization type smoke detectors use a _______ means of detecting smoke particles

Answer 6

americium 241

Question 7

vane or paddle type water flow switches can not be used on what type of system

Answer 7

dry pipe

Question 8

a smoke detector is required in each beam pocket where the beam depths are greater than _____ of the ceiling height and the width between beams is equal to or greater than ______ of the ceiling height

Answer 8

10 percent

40 percent

Question 9

NFPA 72 permits ______ to be used as a guide for smoke detector spacing on smooth and level ceilings

Answer 9

a 30 foot by 30 foot box

Question 10

Which type of smoke detector works best in large open areas?

Answer 10

projected beam type

Question 11

total coverage is defined by NFPA 72 but _________

Answer 11

required by building codes.

Question 12

a room temperature switch is a ______________.

Answer 12

supervisory signal -initiating device

Question 13

the time difference between the ceiling temperature and the sensing element reaching the same temperature is called?

Answer 13

thermal lag

Question 14

on a slopping ceiling beams run up the slope and are 14 inches deep the average ceiling height is 15ft according to NFPA 72 the smoke detector spacing should be _________

Answer 14

smooth ceiling spacing

Question 15

total coverage is _______nfpa 72 but ________ by building codes

Answer 15

defined, required

Question 16

the most appropriate type of detection for a smoldering fire is a ________.

Answer 16

photoelectric or light scattering smoke detector

Question 17

heat detectors should be selected to operate at leas _____ above the maximum expected ambient temperature in the protected space

Answer 17

20 degrees F

Question 18

total coverage is __________ but required by building codes

Answer 18

defined by NFPA 72

Question 19

waterflow switches are permitted to have a time delay or retard up to _______ seconds

Answer 19

90

typically 60 seconds but 90 seconds is amx

Question 20

Water level Switches are a ______ initiating device

Answer 20

supervisory

Question 21

total coverage includes inaccessible ________

Answer 21

combustible areas

Question 22

the spacing of heat detectors on ceilings with joists is generally reduce by ____________>

Answer 22

half in the direction perpendicular to the joists

Question 23

vane or paddle type switches are a ________ initiating device

Answer 23

alarm

Question 24

a smoke detector that has a ________ is best suited for clean rooms

Answer 24

laser particle counter

Question 25

valve supervisory initiating devices must initiate a supervisory signal within _________ revolutions of the hand wheel or _______ of the travel distance of the valve

Answer 25

2

1/5th

Question 26

wall mounted spot type heat detectors are installed so that the top of the detector is _____ from the ceiling

Answer 26

4-12 inches

Question 27

supervisory signal-initiating devices indicate a ________.

Answer 27

off-normal suppression system

Question 28

what device is used to directly detect flames

Answer 28

radiant energy-sensing fire detector

Question 29

rate of rise heat detectors usually operate when the temperature rise is ______ per minute

Answer 29

12-15 degrees

Question 30

heat detectors located on a smooth ceiling that is 19 feet in height must be reduced by ________ of their listed spacing

Answer 30

64 percent

Question 31

smoke detectors that detect smoke by reflecting light from smoke particles onto a sensor are called ________ smoke detectors

Answer 31

light scattering or photo electric