Chapter 10 Flashcards
Which of the following is the purpose of a four-way hydrant valve in making a lay?
a. Enables firefighters to more easily turn on/off the main control valve
b. Allows a second arriving pumper to be connected without interrupting the flow of water to the original supply line
c. Allows the driver/operator to configure multiple types of lays easily and efficiently
d. Allows for as many supply lines as necessary
b. Allows a second arriving pumper to be connected without interrupting the flow of water to the original supply line
Most apparatus are designed so that the procedure for making the pump operational is performed:
a. entirely from the cab of the vehicle.
b. both from the cab of the vehicle and outside of the vehicle.
c. with remote control switches that can be located virtually anywhere.
d. entirely from the outside of the vehicle.
a. entirely from the cab of the vehicle
Which of the following is the MOST important factor in choosing a draft site?
a. Accessibility of water
b. Amount of water available
c. Weather conditions
d. Type or quality of water
B. Amount of water available
In order for a pumper to approach its rated capacity using a traditional strainer, there must be:
a. at least 36 inches (900 mm) of water over the strainer.
b. at least 42 inches (1 050 mm) of water over the strainer.
c. at least 24 inches (600 mm of water over the strainer.
d. at least 12 inches (300 mm) of water over the strainer.
c. at least 24 inches (600 mm of water over the strainer
After a drafting site has been selected, which of the following is a step in connecting to the pump?
a. Engage pump as soon as initial connections are made.
b. Reposition apparatus once all connections are made.
c. Connect the intake hose while on the ground.
d. Couple strainer and required lengths of intake hose and make them airtight.
d. Couple strainer and required lengths of intake hose and make them airtight
Which is the MOST likely problem during drafting if the discharge pressure gauge begins to fluctuate with a corresponding loss of vacuum on the intake gauge?
a. Blockage in the pump itself
b. Attempting to exceed capacity of the pump
c. Gauge readings are incorrect
d. Air is coming into the pump along with water
d. Air is coming into the pump along with water
When a pumper is connected to a hydrant and not discharging water, pressure shown on intake gauge is:
a. the pressure from previous operations.
b. residual pressure.
c. static pressure.
d. atmospheric pressure.
c. static pressure
Which of the following can occur when pumping at a low residual pressure while being supplied by other apparatus?
a. Cavitation of the pump
b. Firefighters may be unable to handle the supply hose
c. Intake pressure from the supply source may be reduced to a point that may damage the pump
d. Friction loss becomes too significant to overcome
a. Cavitation of the pump
Which of the following statements about friction loss in standpipes is MOST accurate?
a. Generally, friction loss is a standpipe is so variable that it cannot be correctly accounted for.
b. Generally, friction loss in a standpipe is small regardless of flow.
c. Generally, friction loss in a standpipe is small unless flow is very large.
d. Generally, friction loss in a standpipe is large regardless of flow.
c. Generally, friction loss in a standpipe is small unless flow is very large
When priming the pump and beginning drafting operations, a two-stage pump:
a. must have the transfer valve in the parallel (volume) position.
b. can have the transfer valve in either the series (pressure) or parallel (volume) position.
c. must initially have the transfer valve in the series (pressure) position but then switch to the parallel (volume) position.
d. must have to the transfer valve in the series (pressure) position
a. must have the transfer valve in the parallel (volume) position
When a dry standpipe system is charged, water will be discharged:
a. at all points where caps are on and valve is closed.
b. at all points regardless of position of valves.
c. at all points where caps are off and valve is open.
d. only in the area of the fire itself.
c. at all points where caps are off and valve is open
To create an effective fire stream during drafting operations, a lift of no greater than
is recommended.
a. 20 feet (6 m)
b. 10 feet (3 m)
c. 30 feet (9 m)
d. 40 feet (12 m)
a. 20 feet (6 m)
Which of the following BEST describes when it is recommended that wheels be chocked?
a. When parked on a slope
b. Every time the driver/operator exits the cab
c. When the driver/operator will leave the parked apparatus
d. If parked more than ten minutes
b. Every time the driver/operator exits the cab
If discharge flow volume is increased too much when operating from a pressurized water source:
a. the supply hose may collapse, interrupting the water supply.
b. intake pressure from the supply source may be reduced to a point that may damage the pump.
c. the area may become flooded.
d. it may lead to cavitation of the pump.
b. intake pressure from the supply source may be reduced to a point that may damage the pump
When drafting, which of the following should be done when positioning the intake hose if the bottom slopes steeply from the water’s edge?
a. Place salvage covers in the water and lay intake hose on top of the covers.
b. Place a roof ladder in the water and lay intake hose on it.
c. Suspend strainer off the bottom by tying it to an anchor point.
d. Place a shovel or other flat metal object on the top to protect the strainer.
b. Place a roof ladder in the water and lay intake hose on it
