CH8

Question 1

Pumps begin at a minimum flow of

Answer 1

250GPM
pg 273

Question 2

Up to 3,000GPM pumps reach their capacity at

Answer 2

150psi
pg 273

Question 3

Above 3,000GPM, the NPDP becomes

Answer 3

100psi
pg 273

Question 4

Modern fire department pumpers utilize _____ pumps as their main fire pump.

Answer 4

Centrifugal
pg 273

Question 5

This pump serves as a non-positive displacement pump, as it does not pump a definite amount of water with each revolution.

Answer 5

Centrifugal pump
pg 274

Question 6

The ______ receives water from the intake side of the pump housing through a hole in its center called the ________.

Answer 6

impeller; impeller eye
pg 274

Question 7

A centrifugal pump contains an impeller assembly with the impeller riding on _______ in a pump case.

Answer 7

wear rings
pg 274

Question 8

The speed at which the impeller rotates is based on the powertrain configuration. It is generally faster than the engine speed from about

Answer 8

1.5:1 to 2.5:1
pg 274

Question 9

The off-center mounting of the impeller within the casing creates a water passage that enlarges as it nears the discharge outlet of the pump. This section is called the

Answer 9

Volute
pg 274

Question 10

Under certain conditions, _________ occurs, and a centrifugal pump will not develop discharge pressure with air in the pump.

Answer 10

air lock
pg 275

Question 11

Three types of centrifugal pumps the fire service employs:

Answer 11

Single-stage, two-stage, and multistage
pg 276

Question 12

Pumps constructed with a single impeller are referred to as

Answer 12

single-stage centrifugal pumps
pg276

Question 13

The single-stage fire pump impeller is sometimes known as the

Answer 13

double-suction impeller
pg 276

Question 14

These pumps contain an impeller for each stage mounted in a single housing

Answer 14

Two-stage centrifugal pumps
pg 276

Question 16

With a ________ configuration delivering water to the volute, the volume of water available in pressure position is limited to the amount that one impeller can supply, which is normally ____ the capacity of the pump.

Answer 16

series; 1/2
pg 277

Question 17

Switching from volume to pressure can

Answer 17

double discharge pressure
pg 278

Question 18

________ valves are essential to the operation of a two-stage pump.

Answer 18

Clapper
pg 278

Question 19

Construction of some fire pumps utilizes up to ____ impellers connected in series to develop high pressure

Answer 19

four
pg 280

Question 20

________ occurs when no water flows from the discharge side of the pump.

Answer 20

Deadheading
pg 280

Question 21

Newer model centrifugal pumps may come with a thermal _____________ that opens to allow overheated water to circulate between the pump and the main water tank or into the atmosphere.

Answer 21

relief valve
pg 281

Question 22

Fibers impregnated with ________ or _______ make up the most common seal-packing material.

Answer 22

Graphite or lead
pg 281

Question 23

To overcome the generation of heat, a spacer known as a ________ or ________ provides cooling.

Answer 23

lantern or slinger ring
pg 281

Question 24

Mechanical seals use materials such as ________ or _________ and offer superior resistance to warping, stretching, and corrosion.

Answer 24

ceramics or graphite
pg 282

Question 25

This ratio is arranged so the impellers turn faster than the engine 1 1/2 to _____ times as fast.

Answer 25

2 1/2 pg 283

Question 26

When the D/O places the transmission in the correct gear, a lockout feature prevents the _______ from switching gears as RPM rises and falls.

Answer 26

transmission pg 283

Question 27

The collar that slides across the shaft in a midship transfer case to lock into the pump or road gear may not make it across because of misaligned or mushroomed teeth, known as a ________ condition.

Answer 27

butt-tooth pg 284

Question 28

_________ pumps commonly serve on initial attack, wildland, or mobile water supply apparatus.

Answer 28

PTO-driven pg 284

Question 29

Conventional PTO unit powered pumps up to approximately ______GPM.

Answer 29

500 pg 285

Question 30

Some manufacturers provide full torque PTO drives that allow for the installation of pumps as large as _____GPM. This type of pump is commonly used with an automatic transmission, where the flywheel of the engine drives the PTO unit.

Answer 30

1,500 pg 285

Question 31

Some manufacturers offer a ______ design that drives off the engine's flywheel.

Answer 31

rear-engine power take-off (REPTO) pg 285

Question 32

The capacity of the pump depends on the engine limit. Typically up to ____GPM.

Answer 32

1250 pg 285

Question 33

_______ pumps may be powered by spliy-shaft transmission or PTO.

Answer 33

rear-mount pg 286

Question 34

This gauge usually calibrates from 0-600 psi of positive pressure and from 0-30 inches of mercury on the negative side.

Answer 34

master intake gauge pg 288

Question 35

When the vacuum reading approaches ___ inches, the pump approaches capacity and cannot supply additional lines.

Answer 35

20 pg 288

Question 36

Mechanical throttles also known as _______ throttles.

Answer 36

Vernier pg 290

Question 37

This control usually operates with a push button, toggle switch, or pull lever.

Answer 37

Primer control pg 290

Question 38

NFPA 1900 requires all components of the piping system to consist of _____ materials.

Answer 38

corrosion-resistant pg 291

Question 39

The piping system and the fire pump itself must be able to withstand a hydrostatic test of ______psi before being placed into service.

Answer 39

500 pg 291

Question 40

________ in modern pumps prevent damage to the tank if the tank to pump valve stays open while water goes to the pump under pressure, such as during relay operations.

Answer 40

Check valves pg 291

Question 41

According to NFPA 1900, pumpers with a tank capacity of less than 500 gallons should have piping capable of flowing ___GPM.

Answer 41

250 pg 291

Question 42

Pumpers with a tack capacity equal to or greater than 500 gallons should be able to flow at least ___GPM or the capacity of the pump whichever is ______.

Answer 42

500; less pg 291

Question 43

The primer taps into the pump at a high point on the suction side or the impeller eye and uses a _____ valve.

Answer 43

priming pg 292

Question 44

All intake lines in a ________ pump go below the eye of the impeller, and no part of the piping sits above this point.

Answer 44

centrifugal pg 292

Question 45

NFPA 1900, all valves should be designed and maintained to operate at pressures up to _____psi.

Answer 45

250 pg 293

Question 46

Some pumps function with a booster line cooling valve (also called a ________) that serves the same function as circulator valve by diverting some discharge water into the tank.

Answer 46

bypass valve pg 294

Question 47

A _______ valve drains standing water below ___psi.

Answer 47

spool; 50 pg 294

Question 48

A ______/______ valve works as a mini quarter turn ball valve that can drain or bleed off higher pressures without damage.

Answer 48

drain/bleeder pg 294

Question 49

NFPA 1900 requires all intakes or discharges that are 3 inches or greater to be equipped with

Answer 49

slow-acting control valves pg 296

Question 51

MIRV

Answer 51

master intake relief valve pg 298

Question 52

PIRV

Answer 52

piston intake relief valve pg 298

Question 53

Intake relief valves should open when the intake pressure rises more than ___psi above the required operating pressure.

Answer 53

10 pg 298

Question 54

________ serve a vital role on modern apparatus because of their ability to pump air and foam.

Answer 54

Positive displacement units pg 299

Question 55

__________ pump works as a positive displacement pump because each pocket in the gears contains a definite amount of water, which gets forced out of the pump each time the gears turn with a positive action.

Answer 55

The rotary gear pg 300

Question 56

To prevent casing damage, most ______ pumps feature gears made of soft metal; strong alloys, including: cast iron, comprise pump casings.

Answer 56

gear pg 300

Question 57

______ pumps operate with moveable elements that automatically compensate for wear, maintaining a tighter fit with closer clearances with pump in use.

Answer 57

rotary vane pg 300

Question 58

Commonly prime centrifugal pumps

Answer 58

rotary vane pumps pg 300

Question 59

Preferred RPM for priming

Answer 59

1,000 to 1,200RPM pg 302

Question 60

NFPA 1900 and 1910 specify that a fire pump in good condition will achieve at least _____ of vacuum.

Answer 60

22inHg pg 307

Question 61

According to NFPA 1900 and 1910 the true test of the accuracy of a gauge stands at __psi, ___ psi, and ____ psi.

Answer 61

150, 200, 250 pg 307