Chapter 9

Question 1

What is a positive displacement pump?

Answer 1

Self priming pump that utilizes a piston or interlocking rotors to move a given amount of fluid through the pump chamber with each stroke of the Piston or rotation of the rotors. Used for hydraulic pumps on aerial devices hydraulic systems and for priming pumps on centrifugal fire pumps

Question 2

What type of pump does not use positive action to force water from the pump rather it depends on the velocity of the water produced by centrifugal force to provide the pressure needed to achieve proper discharge pressure?

Answer 2

Centrifugal pump

Question 3

What is a piston pump?

Answer 3

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

Question 4

Piston pumps rotary pumps rotary gear pumps rotary vein pumps are all examples of?

Answer 4

Positive displacement pumps

Question 5

Type of positive displacement pump commonly used in hydraulic systems. A rotor with attached veins is mounted off center inside the pump housing pressure is imparted on the water as the space between the rotor and the pump housing wall decreases?

Answer 5

Rotary vane pump

Question 6

A pump with one or more impellers that rotate and utilize centrifugal force to move the water. Most modern fire pumps are of this type?

Answer 6

Centrifugal pump

Question 7

What type of pump is classified as a non positive displacement pump?

Answer 7

Centrifugal pump

Question 8

A spiral divergent chamber of a centrifugal pump in which the velocity energy given to water by the impeller blades is converted into pressure is called a?

Answer 8

Volute

Question 9

An intake orifice at the center of a centrifugal pump impeller?

Answer 9

Impeller eye

Question 10

Veined, circulating member of the centrifugal pump that transmits motion to the water is called?

Answer 10

Impeller

Question 11

What are three main factors that influence a centrifugal fire pumps discharge pressure?

Answer 11

Amount of water being discharged
Speed at which the impeller is turning
Pressure of water when it enters the pump from a pressurized source hydrant relay etc

Question 12

Spiral, divergent chamber of a centrifugal pump in which the velocity energy given to water by the impeller blades is converted into pressure is called?

Answer 12

Volute

Question 13

Vaned, circulating member of the centrifugal pump that transmits motion to the water is called?

Answer 13

Impeller

Question 14

Intake orifice at the center of a centrifugal pump impeller is called?

Answer 14

Impeller eye

Question 15

What are the two basic types of centrifugal pumps that are used by the fire service?

Answer 15

Single stage and multistage

Question 16

Pumps used in the fire service constructed with a single impeller are referred to as?

Answer 16

Single stage centrifugal pump

Question 17

A pump that has an impeller for each stage mounted in a single housing is called a?

Answer 17

Multistage centrifugal pump

Question 18

Process of switching between pressure and volume is sometimes referred to as?

Answer 18

Changeover

Question 19

Hinged valve that permits the flow of water in one direction only?

Answer 19

Clapper valve

Question 20

Replaceable rings that are attached to the impeller and or the pump casing to allow a small running clearance between the impeller and pump casing without causing wear of the actual impeller or pump casing material?

Answer 20

Wear rings

Question 21

What are some most common applications for auxiliary engine driven pumps?

Answer 21

Arfff vehicles
wildland fire apparatus
Mobile water supply apparatus trailer mounted fire pumps portable fire pumps

Question 22

A mechanism that allows a vehicle engine to power equipment such as a pump, winch, or portable tool it is typically attached to the transmission?

Answer 22

Power take off system (PTO)

Question 23

The ability of an apparatus to pump water while the vehicle is in motion is called?

Answer 23

Pump and roll

Question 24

Fire pump mounted in front of the radiator of a vehicle and powered off the crankshaft is called?

Answer 24

Front mount pump

Question 25

One major disadvantage of the front mount pump is?

Answer 25

The susceptibility of the pump and gauges freezing and cold weather due to their exposed position

Question 26

The driver operator May check to see that the transmission is in the correct gear by observing the speedometer reading after the pump is engaged with the engine idling in the pump and cage most speedometers will indicate between ______ and _______ mph?

Answer 26

10 to 15

Question 27

Automatic valve that permits liquid to flow in only one direction?

Answer 27

Check valve

Question 28

The most common applications for auxiliary engine driven pumps are?

Answer 28

ARFF, brush truck ,mobile water supply,trailer mounted fire pumps

Question 29

How many gallons or less is the pumping capacity for an auxiliary engine driven pump?

Answer 29

500 gallons or less

Question 30

On an automatic pressure control device it must operate within three to ten seconds after the discharge pressure rises and restricts the pressure from exceeding _____ psi above the set level?

Answer 30

30 psi

Question 31

What are the two basic concepts for pressure relief valves?

Answer 31

Those that relieve excess pressure on the discharge side of the pump Those that relieve excess pressure on the intake side of the pump

Question 32

A pressure control device that controls engine speed, eliminating hazardous conditions that result from excessive pressures is called a what?

Answer 32

Pressure governor

Question 33

A condition in which vacuum pockets form due to localized regions of low pressure at the vanes in the impeller of a centrifugal pump, causing vibrations, loss of efficiency, and possibly damage to the impeller is called?

Answer 33

Cavitation

Question 34

The electronic governor also features cavitation protection by returning the engine to idle when intake pressure drops below ____________ PSI

Answer 34

30

Question 35

Any device, usually a positive displacement pump, used to exhaust the air from inside a centrifugal pump and the attached hard suction this creates a partial vacuum allowing atmospheric pressure to force water from the static source through the suction hose into the centrifugal pump is called a?

Answer 35

Priming device

Question 36

Physical law stating that when a fluid such as water or air is forced under pressure through a restricted orifice there is an increase in the velocity of the fluid passing through the orifice and a corresponding decrease in the pressure exerted against the sides of the constriction because the surrounding fluid is under greater atmospheric pressure it is forced into the area of lower pressure called?

Answer 36

Venturi effect

Question 37

A device used for measuring existing voltage in an electrical system is called?

Answer 37

Voltmeter

Question 38

They gauge that indicates both the amount of electrical current being drawn from and provided to the vehicle's battery is called?

Answer 38

Ammeter

Question 39

What are two types of auxiliary cooling devices?

Answer 39

Marine or immersion type