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DPO/ADO BOOK > Chapter 9 > Flashcards

Chapter 9 Flashcards

Fire Pump Theory

1
Q

What is a positive displacement pump?

A

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

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2
Q

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?

A

Centrifugal pump

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3
Q

What is a piston pump?

A

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

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4
Q

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

A

Positive displacement pumps

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5
Q

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?

A

Rotary vane pump

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6
Q

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?

A

Centrifugal pump

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7
Q

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

A

Centrifugal pump

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8
Q

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?

A

Volute

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9
Q

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

A

Impeller eye

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10
Q

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

A

Impeller

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11
Q

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

A

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

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12
Q

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

Volute

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13
Q

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

A

Impeller

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14
Q

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

A

Impeller eye

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15
Q

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

A

Single stage and multistage

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16
Q

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

A

Single stage centrifugal pump

17
Q

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

A

Multistage centrifugal pump

18
Q

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

A

Changeover

19
Q

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

A

Clapper valve

20
Q

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?

A

Wear rings

21
Q

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

A

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

22
Q

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?

A

Power take off system (PTO)

23
Q

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

A

Pump and roll

24
Q

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

A

Front mount pump

25
Q

One major disadvantage of the front mount pump is?

A

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

26
Q

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?

A

10 to 15

27
Q

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

A

Check valve

28
Q

The most common applications for auxiliary engine driven pumps are?

A

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

29
Q

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

A

500 gallons or less

30
Q

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?

A

30 psi

31
Q

What are the two basic concepts for pressure relief valves?

A

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

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

32
Q

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

A

Pressure governor

33
Q

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?

A

Cavitation

34
Q

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

A

30

35
Q

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?

A

Priming device

36
Q

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?

A

Venturi effect

37
Q

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

A

Voltmeter

38
Q

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

A

Ammeter

39
Q

What are two types of auxiliary cooling devices?

A

Marine or immersion type

DPO/ADO BOOK (20 decks)

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