Definitions

Question 1

The generic term applied to any nozzle, wye, siamese, deluge monitor, or any other piece of hardware, used in conjunction with fire hose for the purpose of delivering water.

Answer 1

Appliance

Question 2

Any pumping apparatus that is supplying water directly to attack lines.

Answer 2

Attack pumper

Question 3

Pumps used on all modern fire apparatus. This type of pump takes advantage of incoming pressure. Water enters the eye of the pump then travels through one or more impellers.

Answer 3

Centrifugal pumps

Question 4

The quantity of water issuing from an opening expressed in GPM.

Answer 4

Discharge

Question 5

Actual velocity pressure of the water (measured in psi) for an individual hose line.

Answer 5

Discharge pressure

Question 6

The rate at which water travels from an orifice and can be measured using a pitot gauge.

Answer 6

Discharge velocity

Question 7

Master stream nozzle attached to or being operated from an aerial ladder.

Answer 7

Elevated stream

Question 8

Gain or loss of pressure in a hose line or system due to a change in elevation.

Answer 8

Elevation pressure

Question 9

Pressure created by the velocity of water coming from a discharge opening.

Answer 9

Flow pressure

Question 10

The loss of pressure created by the turbulence of water moving against the interior walls, couplings, and connections of the hose or pipe.

Answer 10

Friction loss

Question 11

Line run directly from a hydrant to an attack pumper

Answer 11

Gutter line

Question 12

Water pressure due to elevation. For each foot of elevation above the pump the pressure increases by 0.434 psi.

Answer 12

Head pressure

Question 13

Master stream nozzle mounted to the fly of an aerial ladder

Answer 13

Ladder pipe

Question 14

Any variety of heavy caliber water streams delivering 350 gallons or more

Answer 14

Master stream

Question 15

The pressure found in a water distribution system during normal consumption demands at any moment in time.

Answer 15

Normal operating pressure

Question 16

The velocity pressure at which water is discharged from the nozzle

Answer 16

Nozzle pressure

Question 17

Counterforce directed against a person or a device holding a nozzle by the velocity of water being discharged

Answer 17

Nozzle reaction

Question 18

Small positive displacement pump used to evacuate air from a centrifugal pump housing allowing the pump to receive water.

Answer 18

Primer pumps

Question 19

Actual velocity pressure of the water (measured in psi) as it leaves the pump.

Answer 19

Pump discharge pressure

Question 20

A pumper that is between the source pumper and attack pumper. This pumper receives water from the direction of the source pumper and boosts pressure towards the attack pumper.

Answer 20

Relay pumper

Question 21

Pressure remaining in a water system when water is flowing.

Answer 21

Residual pressure

Question 22

An appliance that combines two or more hose lines into one.

Answer 22

Siamese

Question 23

The pressure exerted by water at rest in a confined vessel available to force the water through pipe, fittings, fire hose, and adapters.

Answer 23

Static pressure

Question 24

The pumper connected to the water supply at the beginning of a relay operation

Answer 24

Supply pumper or source pumper

Question 25

The total amount of pressure loss in a hose assembly due to friction loss in the hose and appliances, elevation pressure, or any other factors.

Answer 25

Total pressure loss

Question 26

The speed at which water passes a given point

Answer 26

Velocity

Question 27

The force created by the rapid deceleration of water. Generally occurs from opening or closing a valve to o quickly. Damage to pumps, plumbing, and hose lines may occur 

Answer 27

Water hammer

Question 28

An appliance that breaks one hose line into two or more hose lines with one female and two or more male outlets, usually gated.

Answer 28

Wye

Question 29

What number is a mathematical constant derived for a round opening?

Answer 29

29.7

Question 30

Relays are defined as what?

Answer 30

Two or more pumpers that are in line between the water source and the nozzle.