5 Water Supply

Question 1

Mobile water supply apparatus generally carry how many gallons of water

Answer 1

1000 to 3500 gallons

Question 2

Vehicles caring 1000 gallons of water or more of a fire pump are generally referred to as

Answer 2

Tankers

Question 3

Water carrying apparatus with a standard fire pump and a large water tank used for fire attack or pumping water to pumpers on the fire ground referred to as

Answer 3

Pumper tankers

Question 4

Vehicles carrying 1000 gallons of water or more without a fire pump but may utilize a small PTO driven pump, specifically designed to carry water to fire are called

Answer 4

Tenders

Question 5

A method to offload tanker water where pressurized water stream is used to increase the velocity of a larger volume of water that is flowing by gravity through a dump valve

Answer 5

Jet assist

Question 6

A method to offload tanker water where the tank is pressurized to assist in expelling the water through the dump valve

Answer 6

Pneumatic system

Question 7

What determines the number of attack lines to be placed in service

Answer 7

The supply of water that can be maintained

Question 8

Water delivery capacity of a pumper is limited by the

Answer 8

Capacity of the pump, the number of suction intakes, and discharges

Question 9

Operation of a pumper is limited by

Answer 9

Engine speed and residual pressure

Question 10

Pump systems must be capable of delivering the following

Answer 10

100% rated capacity at 150 psi.
70% of rated capacity at 200 psi.
50% of rated capacity at 250 psi

Question 11

Pumpers are rated from which type of water source

Answer 11

At draft from the static water source

Question 12

True/false pumpers cannot exceed their rated capacity if they are receiving water under positive pressure

Answer 12

False pumpers can exceed capacity when being fed positive pressure water

Question 13

Which type of valve can be used to receive water from two different supply lines of minimum 2 1/2 inches

Answer 13

Gated suction Siamese valve

Question 14

Minimum size of discharge outlets to provide the rated capacity of the pump

Answer 14

2 1/2 inches or larger

Question 15

Usual practice is to install wanted to and a half inch discharge for each what in rated capacity of a pump

Answer 15

One 2 1/2 inch discharge for each 250 gallons per minute of rated capacity

Question 16

The pump must not be operated about what percent of it’s rated peak speed for any length of time

Answer 16

80%

Question 17

An increase in engine pump speed, RPM, that does not result in an increase in discharge pressure indicates what

Answer 17

That the pumper has reached it’s pumping capacity or limit of the water supply

Question 18

Pump operators should maintain a residual pressure of what at all times

Answer 18

20 PSI or more at all times

Question 19

The residual pressure of a pump should not be allowed to drop below what

Answer 19

10 psi except under extreme conditions

Question 20

If minimum allowable residual pressure, 10 psi, is reached, the proper procedure is to

Answer 20

Notify the company officer lower discharge pressure never shut down a hose line without knowledge and consent

Question 21

If action is required to limit the flow of water to increase residual pressure who should determine what actions to be taken to correct the problem

Answer 21

The incident commander

Question 22

A measure of the reserve capacity of the hydrant is what

Answer 22

Residual pressure

Question 23

As more water is taken from the hydrant what happens to residual pressure

Answer 23

It drops, The more water taken the less water remains as potential capacity

Question 24

As flow rate increases what happens to friction loss

Answer 24

Friction loss increases

Question 25

Hose that is designed to convey water to hose line nozzles, distributor nozzles, master stream appliances, portable hydrants, manifolds, standpipe and sprinkler systems, and pumps used by the fire department.

Answer 25

Attack hose

Question 26

Hose that is designed for moving water between a pressurized water source and a pump that is supplying attack lines

Answer 26

Supply hose

Question 27

When and LDH is used to supply attack lines master streams hydrants manifolds standpipes and sprinklers what should be used

Answer 27

A pressure relief device with a maximum setting of 200 psi

Question 28

The standard hose of the fire service nationally is

Answer 28

2 1/2 inch hose

Question 29

A 2 1/2 inch supply line should not be used to deliver more than how many gallons per minute

Answer 29

350 gallons per minute

Question 30

Per 100 feet the friction loss of 2 1/2 inch hose flowing 350 gallons per minute is

Answer 30

25 PSI per 100 feet

Question 31

Friction loss of 2 1/2 inch hose operating at 250 gallons per minute per hundred feet

Answer 31

15 psi per 100 feet

Question 32

True/false two, 2 1/2 inch supply lines is preferred over one 2 1/2 inch supply line flowing over 350 gallons per minute

Answer 32

True

Question 33

What is required of hose to decrease the friction loss as well as the number of his lines needed to move a given amount of water

Answer 33

Increase the diameter of the hose

Question 34

One 3 inch line is almost as effective as how many 2 1/2 inch lines

Answer 34

Two

Question 35

What defines an LDH as hose with an inside diameter of 3 1/2 inches or larger

Answer 35

NFPA 1961

Question 36

4 inch LDH delivers a volume of water approximately equivalent to how many 2 1/2 inch hose

Answer 36

3 1/2, 2 1/2 inch hose lines

Question 37

5 inch LDH delivers a volume of water approximately equivalent to how many 2 1/2 inch hose lines

Answer 37

Six 2 1/2 inch hose lines

Question 38

A pumper approaching the fire from a water source should perform which type of lay

Answer 38

Forward lay

Question 39

If a pumper arrives at the fire first which type of lay should be used from the fire

Answer 39

Reverse lay from the fire to a water source

Question 40

As a rule, under average conditions, what pressure should a pumper at a hydrant initially begin pumping to a unit at the fire

Answer 40

100 psi

Question 41

To counteract friction loss of long lays exceeding 1000 feet what type of pumping method should be used

Answer 41

Relay pumping

Question 42

The maximum capacity of a relay operation is determined by what

Answer 42

The smallest pump capacity and or the smaller supply hose use in the relay

Question 43

If LDH is not being used to supply lines should be laid initially only if what

Answer 43

They can be laid simultaneously

Question 44

If LTH is not being used for initial supply line and conditions permit what should be done for supply lines

Answer 44

Lay two supply lines

Question 45

When initiating a relay pump, what is the process of charging LDH

Answer 45

Pump at water supply charges hose to second pumper, second pump opens intake and charges supply line to third pumper

Question 46

At the start of the really operation all pumpers in the line should set up to pump what pressure to the pumper at the fire

Answer 46

150 psi

Question 47

During a relay pump, if additional water is needed, relays capacity is exceeded, what should be done

Answer 47

Another supply line should be late between the operating pumpers

Question 48

Static pressure is

Answer 48

The pressure in the water pipe with no water is flowing

Question 49

Residual pressure is

Answer 49

The pressure remaining in a water distribution system while the water is flowing. The residual pressure indicates how much more water is potentially available

Question 50

Three factors influence the movement of water at fires, they are

Answer 50

Water source, pumper, hose

Question 51

The four possible water sources at the fire ground are

Answer 51

Watermain systems, static water sources, apparatus water tanks, mobile water supply apparatus.

Question 52

Flow test of the water main system and components should

Answer 52

Be done by the fire department for the fire department should be part of the process

Question 53

Areas with what type of water mains are especially vulnerable to water supply problems

Answer 53

Dead and mains and small mains

Question 54

What type of gauge is used to measure static and residual pressure of intake

Answer 54

Compound gauge

Question 55

At the beginning of the pump operation the driver reads the compound gauge with the hydrant open and all discharge gates closed, showing which type of pressure

Answer 55

Static

Question 56

With one attack line charged to the proper discharge pressure of the compound gauge is read again, Showing what

Answer 56

Residual pressure

Question 57

What gives you the true measurement of available water

Answer 57

The difference between static and residual pressure

Question 58

When estimating attack lines drop of about 5% from the static pressure to the residual pressure indicates how much more can be delivered by the hydrant

Answer 58

Three equal parts equivalent to the amount being delivered

Question 59

When estimating attack lines a static to residual drop off 10% indicates how many more equal parts can be supplied from the hydrant

Answer 59

Two more equal parts

Question 60

A static to residual pressure drop of 20% indicates how many more parts can be delivered from the water main system

Answer 60

One more equal part

Question 61

In regard to supplying fire attack hose lines from the apparatus water tank and smoke or fire showing situations, is it acceptable

Answer 61

Yes but An uninterrupted supply of water must be established

Question 62

When operating a take a shuttle as a water supply house should tankers be filled

Answer 62

By pumper stationed at the water source

Question 63

Pumper intakes in the United States must have

Answer 63

National hose male threads

Question 64

Quick friction loss calculation for 2 1/2 inch hose by gallons per minute

Answer 64

Take the number of gallons per minute drop the last digit subtract 10. 350, drop zero, subtract 10. 25 psi per 100ft

Question 65

The proper size hose for a supply line is

Answer 65

Always LDH if available

Question 66

Name the two main types of mobile water supply apparatus

Answer 66

Tanker and tender