9 Fire Pump Theory

Question 1

Positive displacement pump using one or more reciprocating Pistons to force water from the pump chamber

Answer 1

Piston pump

Question 2

Type of pump commonly used for primer pumps

Answer 2

Rotary gear pump

Question 3

Pump with one or more impellers that rotate and utilize forced to move the water modern fire pumps are of this type

Answer 3

Centrifugal pump

Question 4

Three main factors that influence a centrical fire pump discharge pressure

Answer 4

Amount of water being discharged.
Speed at which impeller is turning.
Pressure of water when it enters the pump

Question 5

Centrifugal pump is unable to pump air and is therefore not

Answer 5

Self priming

Question 6

Two-stage pump or multistage pump operates in volume position when they are pumping in what

Answer 6

Parallel

Question 7

Multistage pump operates in the pressure position when it is pumping in what

Answer 7

Series

Question 8

If there’s any question as to the correct position for the transfer valve and a multistage pump the best is to operate in what mode

Answer 8

In parallel, volume mode

Question 9

What is the essential part for the operation of a multistage pump

Answer 9

Clapper or check valve

Question 10

Multistage pumps with the ability for pumping high pressures are especially useful for what application

Answer 10

Pumping tall high-rise standpipe or sprinklers

Question 11

True false positive displacement pump potential damage can result from shutting off discharges

Answer 11

True

Question 12

What happens in a centrifugal pump when the discharges are closed

Answer 12

The water is heated and it builds up

Question 13

To prevent water temperature from building up in a centrifugal pump operator do

Answer 13

Open the tank fill valve to circulate water

Question 14

True false generally when the pump is operating under pressure water should trip at a rate specified by the manufacture from the packing but not run as a steady stream

Answer 14

True

Question 15

What happens if the pump is not used for an extended period of time

Answer 15

The packing may dry out and cause excessive leaking

Question 16

Centrifugal pumps rely on what force of action to provide the pressure needed to achieve proper water discharge pressure

Answer 16

Velocity of the water produced by centrical force

Question 17

Pumps powered by gasoline or diesel engines independent of the vehicle drive engine are examples of

Answer 17

Auxiliary pumps

Question 18

Auxiliary palms generally have the capacity to pump what volume

Answer 18

500 GPM or less

Question 19

Mechanism that allows a vehicle engine to power equipment such as a pump it is typically attached to the transmission

Answer 19

Power take off. PTO

Question 20

Front mount pumps typically have a pumping capacity of up to

Answer 20

1250 gpm

Question 21

Fire pump mounted in front of the vehicle and powered off the crankshaft

Answer 21

Front mount pump

Question 22

In order to determine if the pump is engaged and operator can check what gauge in the cab

Answer 22

Speedometer, between 10 to 15 mph

Question 23

Type of power system that runs off of the driveshaft to a transfer case using chains or belts to operate the pump

Answer 23

Split shaft system

Question 24

Piping of the pump system must be capable of withstanding hydrostatic test of how many PSI

Answer 24

500 psi before being placed in the service

Question 25

Pumpers with a capacity of 500 GPM or less should have piping capable of flowing how many GPM

Answer 25

250 gpm

Question 26

Conference with the capacity of 500 GPM or more should be able to flow how much through it's piping

Answer 26

At least 500 gpm

Question 27

Pumps with a capacity of greater than 750 gallons per minute must be equipped with how many two and half inch discharges

Answer 27

At least two

Question 28

Pump rated less than 750 GPM are required to have how many 2.5 inch discharges

Answer 28

Only one

Question 29

What size pipe must supply 1.5-2" discharges

Answer 29

At least 2"

Question 30

For water tanks less than 1000 gallons the tank fill valve pipe must be how big

Answer 30

At least 1"

Question 31

For water tanks greater than 1000 gallons in the tank fill line must be at least how large

Answer 31

At least 2 inches

Question 32

A valve that circulates water back through the tank or dumps onto the ground to keep the pump cool

Answer 32

Circulator valve or recirculator valve

Question 33

For prolonged operations it may be necessary to do what to keep the pump and water cool

Answer 33

Discharge water through a dump line or hose on the ground.

Question 34

NFPA requires all intake or discharges that are 3 inches or greater be equipped with a slow acting control valve to reduce water hammer. Opening action shouldn't take less than how long

Answer 34

3 seconds

Question 35

What can be used to drain the line if the hose is unable to be bled off

Answer 35

Discharge drain valve

Question 36

In order to drain booster hose during freezing temperatures may be necessary to do what in addition to opening the drain

Answer 36

Unravel and drain the hose

Question 37

How fast does a pressure relief valve need to kick in

Answer 37

3-10 seconds after pressurize

Question 38

Pressure relief valve must prevent pressure from exceeding how many psi above the set level

Answer 38

30 psi

Question 39

Two types of pressure relief valve

Answer 39

Leave on discharge side. Relieve pressure on intake side.

Question 40

Most common pressure relief valve

Answer 40

Pilot valve that opens and reroutes water back to the intake

Question 41

Although pressure relief valves Quick to react they are somewhat slower to

Answer 41

Reset back to the closed position

Question 42

Is generally recommended that the intake relief valve be set to open when the intake pressure rises more than how many PSI above necessary operating pressure

Answer 42

10 psi

Question 43

Pressure control device that controls engine speed eliminating hazardous conditions that result from excess pressure's

Answer 43

Pressure governor

Question 44

Electronic governors also feature cavitation protection by returning the engine idle when intake pressure drops below how many PSI

Answer 44

30 psi

Question 45

Most modern pumpers use what type of primer motor

Answer 45

Positive displacement rotary vein and rotary gear type

Question 46

What must be checked in the oil reservoir for the priming pump to make sure it is free of dirt and so that it operates appropriately as the tank drained

Answer 46

Oil reservoir vent

Question 47

an air primer uses the air compressor to supply air to a jet pump that creates what effect to prime the pump

Answer 47

Venturi affect

Question 48

Although not required what to gauges or indicators are recommended for installation on the pump panel

Answer 48

Automatic transmission temperature gage, fuel level

Question 49

Two primary gauges operator uses to determine water pressure entering and leaving pump

Answer 49

Master intake and discharge gauge

Question 50

The master intake and discharge gauge is usually calibrated from 0 to 600 PSI and what level to indicate vacuum

Answer 50

0-30 inches of mercury for vacuum on the negative side

Question 51

When drafting as the pump speed increases demand increases on the draft, when the vacuum reading approaches what reading, the pump is nearing its capacity and unable to supply additional lines

Answer 51

20 inches of mercury negative

Question 52

What is allowed to be used as a substitute for individual pressure discharge gauges

Answer 52

Flowmeter readouts

Question 53

Even with a flowmeter system and use the apparatus is still required to have what

Answer 53

Master intake and master discharge pressure gauges

Question 54

Throttle lock that can be turned clockwise or counterclockwise to achieve pressure is also known as

Answer 54

Vernier throttle

Question 55

The primary function of an auxiliary cooling system is to control the temperature of coolant in what during pumping operations

Answer 55

The apparatus engine

Question 56

In extreme cases when the engine is overheating and the auxiliary cooling systems don't work what can be done for a very brief time to cool the motor while interior crews withdraw

Answer 56

Directly hose line through the radiator of the motor