Pumper Chapter 10

Which method do many water supply districts employ to signify the capacity of hydrants in their system? pg340

• Numerical labels corresponding to the flow rate of each hydrant.

• Alphabetical markings indicating the age of the hydrant.

• Assigned symbols for each hydrant's capacity.

• Color-coded marking system to denote the capacity of hydrants.

Which scenario may present a challenge for the forward lay firefighting tactic? pg 341

• Short distances between the hydrant and the fire, but with limited water pressure due to infrastructure issues.

• Moderate flow demands that necessitate precise nozzle adjustments for effective fire control.

• The availability of numerous hydrants along the route, potentially causing confusion in selecting the optimal water source.

• Long lays with large flow demands, where the need for a pumper at the hydrant to utilize all available pressure may delay water delivery to the fire.

When using a four-way hydrant valve and the pressure in the supply pump builds high enough to close the clapper valve this happens. pg342

• The original supply line is now being fed from the pump, not directly from the hydrant.

• The original supply line is now being supplemented by the pump.

• The original supply line is now being fed directly from the hydrant

• The original supply line is now no longer needed and can be turned off.

If the master intake gauge reaches __ psi, the throttle must not be increased further due to risk of cavitation. pg346

• 10

• 20

• 25

• 30

Atmospheric pressure decreases about __ psi for each 1000 feet of altitude gain. pg352

• 0.5

• 0.75

• 1

• 2

Most pumps are able to develop a vacuum of about __ inches of mercury. pg354

• 26

• 22

• 30

• 18

Which statement accurately describes the relationship between lift height and the capacity of fire pumps meeting NFPA requirements? pg357

• Fire pumps maintain consistent capacity regardless of lift variations, ensuring reliable performance.

• Decreases lift height often correlates with decreased pump capacity.

• For NFPA-compliant pumps, variations in lift height have minimal impact on pump capacity.

• Fire pumps are rated to pump their capacity at 10 feet of lift; if the lift is less, the pump's capacity is higher, but decreases if the lift is greater.

When the pump has been made operation, priming the pump will begin the drafting operation. For two-stage pumps, the transfer valve must be in the ____ position. pg358

• Parallel (volume)

• Series (pressure)

• Combination

• Automatic

Which of the following accurately describes the function of a Pressure-Reducing Valve? pg365

• A valve installed at a hydrant connection to regulate the flow of water during firefighting operations.

• A valve installed at a standpipe connection to increase gpm by reducing water pressure that is too high and creating turbulence.

• A valve installed at a standpipe connection designed to decrease the water pressure to a specific level, typically around 100 psi.

• A valve installed at a fire truck connection to control the flow of water from the truck's tank during firefighting operations.

DO not use a pump discharge pressure in excess of ___ psi unless the standpipe system has been designed to function higher pressures.

• 170

• 185

• 205

• 215