BC 4

Question 1

straight run stairs

Answer 1

extend in one direction for entire length
landings fir vertical travel

Question 2

circular stairs

Answer 2

minimum width of the run is ten inches
small radius of the full circle is greater than or equal to the widest part of the stair tred

Question 3

escalator speeds

Answer 3

100 ft per min
90-120 in older ones

Question 4

types of electric elevators

500V power supply

Answer 4

drum elevators-passaneger use
traction elevators- passenger use
machine room less (MRL) passenger use
dumbwaiters- limited cargo

Question 5

traction elevator

Answer 5

most common type in buildings over 6 stories

Question 6

AC vs DC elevator motors

Answer 6

AC brakes are directly involved in stopping the car
DC brakes simply hold car in place

Question 7

elevator hoist way fire rating

Answer 7

1-2 hours based on height of building

Question 8

elevator and stair shafts

Answer 8

use shear walls

Question 9

mushrooming

Answer 9

smoke spread horizontally into upper floors

Question 10

hoistways

Answer 10

can hold three or less elevators four or more requires 2 hoist ways
in a building with more than one hoist way up to four elevators can be in one

Question 11

express elevators

Answer 11

zone is 15-20 consecutive floors
lower express zone does not have access for rescue. upper ones do

Question 12

blind hoistway

Answer 12

express elevators that serve upper zones
no entrance to hoist way on floors between main and lowest floor served
is a single car hoist way is used access doors for rescue are every three floors

Question 13

sky lobby

Answer 13

common discharge point for two separate elevator systems
two cars may use same hoist way but in diff zones

Question 14

double deck elevator

Answer 14

two cars permanently connected vertically in same hoist way
bottom serves odd floors top even
people may wait while one discharges

Question 15

elevator doors( hoist way or car)
door opening sequence

Answer 15

1. elevator stops at correct level driving vane attached to car door holds it open
2. as door opens vane strikes roller that releases hoist way lock
3. car doors then pull hoist way doors completely open
4. controller signals door to close, weight forces hoist way doors closed, driving vane removes from roller, hoist way doors re lock

Question 16

emergency exits in elevators

Answer 16

top exit provided in all electric traction elevators
hydraulic elevators only if it has a manual lowering valve
all top exits open outward

Question 17

refuse and laundry chutes

Answer 17

sprinklers required at the top and in the termination room

Question 18

pipe chases are for

Answer 18

hot and cold potable water
drain lines
steam
hot and chilled water for HVAC
sprinkler piping
plumbing pips in one or two story buildings do not require a fire resistant rating

Question 19

HVAC systems include

Answer 19

hundreds of feet of ductwork
heating equiptment
refrigeration option
motors and blowers

Question 20

duct detector fans

Answer 20

fans with capacities exceeding 2000 sq ft per minute

Question 21

interstitial spaces used as return air plenum

Answer 21

HVACs without a duct system
cheaper

Question 22

forced air HVAC in multi story building

Answer 22

vertical air ducts and a mechanical room
enclosed in fire rated shaft

Question 23

NFPA 90A

Answer 23

HVAC duct enclosures be 1 hour rated for buildings less than four stories
2 hours for 4 or more

Question 24

advantages of manual smoke control system

Answer 24

elimination of system disruption due to false alarms and more specific system control

Question 25

draft curtains (curtain boards)

Answer 25

used in conjunction with vents to increase their effectiveness
depth should not be less than 20% of the ceiling height
spaced no farther apart than 8 times the ceiling height

Question 26

smoke towers

Answer 26

require location on the periphery of the floor plan
dedicated floor space in the building
corridor access to the stairwell

Question 27

compensated smoke control system

Answer 27

airflow into stairwell cane be adjusted based on how many doors are open

Question 28

electrical equipment voltages

Answer 28

high voltage is 600 or higher
low is less than 600

Question 29

transformers

Answer 29

convert high voltage to appropriate voltage for system to use

Question 30

voltage supplied to structure

Answer 30

medium and large buildings- 3 phase 208-120 volt transformers

Question 31

air cooled (dry) transformers

Answer 31

fins, heat sinks and ventilation openings

Question 32

electric voltages

Answer 32

comes into the building at 480-277
carry same amount of energy in smaller wire and conduit as 120-240
480 used by HVAC, refrigeration and motors
277 used by light fixture ballasts
120 used by office equipment table lamps and household appliances

Question 33

dialectric

Answer 33

non conducting

Question 34

PCBs

Answer 34

polychlorinated Biphenyls

Question 35

protection when transformers are inside

Answer 35

3 hours if non sprinkled
1 hour if sprinkled

Question 36

minimum fuel storage for generator internal combustion generators

Answer 36

normal 2-8 hours
hospital 48 hours or more

Question 37

fuel storage for generators day tank

Answer 37

limited to 60 gallons

Question 38

emergency power batteries

Answer 38

small uninterruptible power supplies (UPS) near fire alarm system control panels, under desks, next to computers
battery charging room for battery powered vehicles - storage, manufacturing, golf clubhouses
cellular equipment with independent battery backup systems hosted on taller buildings