Ventilation Systems

Question 1

ventilation is maintained under what two distinct conditions

Answer 1

normal and emergency

Question 2

how is ventilation accomplished during an emergency conditions

Answer 2

mechanically

Question 3

fans are used in either ____ or ____ mode depending upon needs

Answer 3

supply and exhaust

Question 4

primary method of _____ in the tunnels is the movement of trains

Answer 4

air exchange

Question 5

what is the piston effect

Answer 5

as a train moves forward it forces air ahead of it and draws air behind it

Question 6

as a train approaches a station_____ allows air to be moved up and out of the system

Answer 6

vent shafts

Question 7

the vent shafts contain thermostatically controlled ____ and ____ that allow air movement

Answer 7

louvers and fans

Question 8

as long as the fans are in the _____ mode the thermostats will operate the fans

Answer 8

automatic operation

Question 9

during emergencies ____ can remotely activate the fans from their computers

Answer 9

OCC

Question 10

low temperature mode is below____ degrees and dampers and fans are ________

Answer 10

50 degrees and not operating

Question 11

normal temperature mode is between____to_____ degrees and dampers are open and fans are not operating

Answer 11

50 to 95 degrees

Question 12

high temperature mode is above______ degrees and dampers are open and fans are operating

Answer 12

95 degrees

Question 13

in emergency mode dampers are open and fans are operating under control of OCC but when fire/rescue arrives, fan control becomes the responsibility of __________

Answer 13

incident commander

Question 14

fans are part of the station air exchange system by which cool air is supplied to the station when the temperature exceeds _____ degrees

Answer 14

70 degrees

Question 15

when activation is requested it normally takes ____ to ____ seconds for the fans to actually start

Answer 15

40-60 seconds

Question 16

do all control boxes have found settings

Answer 16

no

Question 17

tunnel fan shafts contain from _____ to_____ supply fans

Answer 17

2 to 7

Question 18

the supply fans are approximately ____ inches

Answer 18

60 inches

Question 19

the supply fans produce _____cfm of exhaust and ____cfm supply

Answer 19

50,000 (exhaust) 35,000 (supply)

Question 20

domes have how many air inlets/outlets

Answer 20

2 at each end of the platform

Question 21

platforms have how many air inlet/outlets

Answer 21

40 per platform

Question 22

how many platform air conditioner units are there

Answer 22

20 per platform

Question 23

what are the 5 stations where the under the platform exhaust fans only work in exhaust mode

Answer 23

DuPont circle, Farragut north, Metro center, judiciary square* and Gallery placed upper level

FD GUM

*union?

Question 24

the station under platform ventilation systems have ________ control boxes that control_________

Answer 24

two, one half of the station

Question 25

where are the control boxes for the under platform exhaust system located

Answer 25

at each end of the station

Question 26

Tunnel ventilation is achieved by four different modes of operation. During high temperature mode above 95°F, what occurs

Answer 26

Dampers are open, and fans are operating in the exhaust setting