Chapter 12 - Control of Utilities Flashcards
Natural gas is ____ air.
a. Lighter than
b. Heavier than
c. The same molecular weight as
d. The actual weight of natural gas varies depending on the petroleum fractions used to produce the gas
a. Lighter than
If natural gas is burnin at the gas meter just beyond the shutoff valve, the best tactic would be to
a. Push the fire away from the valve using a full fog pattern while a fire fighter closes the valve
b. Extinguish the fire and then immediately close the valve
c. Extinguish the fire, and if the pipe is copper, immediately crimp the pipe to shut off the flow
d. Allow the fire to burn, protecting nearby combustibles until the source can be shut off
d. Allow the fire to burn, protecting nearby combustibles until the source can be shut off.
If smoke is encountered at an electrical substation, which of the following would be the best course of action?
a. Call the utility company. Force entry to determine the extent of the fire, and then control the fire using a nonconductive extinguishing agent
b. Call the utility company. Force entry, and attempt to shut the equipment involved in fire from a remote location, then extinguish the fire when you are sure the equipment is de-energized using a nonconductive extinguishing agent
c. Call the utility company. Force entry. Attempt to shut down the equipment involved in the fire from a remote location, but do not attempt extinguishment
d. Call the utility company, but remain outside of the substation
d. Call the utility company, but remain outside of the substation.
In regard to a forced-air system in a building, it is generally best to
a. Limit or close the return air flow from the fire area using dampers or other built-in equipment to stop the circulation of smoke and other products of combustion
b. Limit or close heated (treated) air ducts using dampers or other provided means to stop the circulation of smoke and other products of combustion to areas outside the fire area
c. Close all dampers to limit smoke circulation
d. Shut down the heating and cooling system for the entire building
d. Shut down the heating and cooling system for the entire building.
Heating ventilation and air conditioning systems in large buildings often have automatic dampers that close, and this automatic closure is actuated when _____
a. Fusable links melt causing a-loaded mechanism to close the damper
b. Smoke detectors sense the products of combustion that cause the damper to close
c. Either fusible links or smoke detectors are used to actuate the closing device on the damper
d. Very few buildings built since 1965 are equipped with dampers; newer buildings use reversible air flow and positive pressure to control smoke movement
c. Either fusible links or smoke detectors are used to actuate the closing device on the damper.
Small oil-burning furnaces will be equipped with an emergency shutoff switch
a. When this switch is used to shut down the pump, the flow of fuel is stopped, and any danger of a fuel leak is eliminated
b. When this switch is used to shut down the pump, fuel will continue to flow into the furnace, but at a lower rate
c. When this switch is used to shut down the pump, the flow of fuel is stopped unless there is a break in the pipe. If the pipe is ruptured, fuel will continue to flow when the oil tank is above the burner or rupture
d. This switch is used to shut down the blower, not the fuel supply
c. When this switch is used to shut down the pump, the flow of fuel is stopped unless there is a break in the pipe. If the pipe is ruptured, fuel will continue to flow when the oil tank is above the burner or rupture.
Large oil-burning heating systems usually
use No. 6 fuel oil, which is ______
a. Classified as a highly flammable liquid similar to gasoline in physical properties
b. Classified as a highly flammable liquid, but with a flash point higher than gasoline (85 degree F to 93 degree F)
c. A combustible liquid equal to kerosene in terms of flammabliity with a flash point of 102 degree F to 105 degree F
d. A combustible liquid that is much less flammable than kerosene
d. A combustible liquid that is much less flammable than kerosene.
A fire threatens a bank of gas meters located in a basement of an apartment building and the utility company has been
delayed; the incident commander has ordered the gas shut off. As the ladder company officer, what is the best method of shutting down the gas supply to the building?
a. Close the distribution system valve serving the neighborhood
b. Close the street valve
c. Close the quarter-turn valve at the meter
d. All of the above are acceptable means of shutting down the gas supply
c. Close the street valve.
Electrical service provided to a building is
a. 12 volts
b. 110 volts
c. 220 volts
d. Voltage is normally 110 or 220 in a dwelling, but varies by occupancy
d. Voltage is normally 110 or 220 in a dwelling, but varies by occupancy.
When cutting all electrical power to a dwelling
a. Fire fighters should pull the meter
b. Fire fighters should cut the service entry
c. Fire fighters should only perform the tasks in ( a) and (b) above if they are properly trained and have the equipment necessary to perform the tasks safely
d. Fire fighters should wait for the utility company and have the utility company cut power to the building
d. Fire fighters should wait for the utility company and have the utility company cut power to the building.
In most cases, shutting down electrical service to a building will _____ the elevators.
a. Not affect the power supply to the elevators
b. Also shut down power to the elevator
c. Will cause the elevators to operate in “emergency mode”
d. No general statement can be made regarding relationship between building power and elevator power
a. Not affect the power supply to the elevators.
