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Flashcards in Pump 10 Deck (58)
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1
Q

The modern fire department is equipped with a ($$$$$) as its main pump.

A

Centrifugal pump

2
Q

The ($$$$$$) does not use positive action to force water through the pump, it depends of the velocity of the water produced by the centrifugal force to provide the necessary pump discharge pressure for effective operation.

A

Centrifugal pump

3
Q

The forward stroke causes waster to be discharged, and the return stroke causes the pump to fill with water again. This is known as a ($$$$$$). Adding two additional valves can produce a more constant stream. This is known as a ($$$$$$) because it both receives and discharges water on each stroke of the piston.

A

Single acting piston pump

Double a ting piston pump.

4
Q

Although piston pumps are no longer used as high capacity pumps, some are still in service for high pressure stream fire fighting. These multi cylinder , PTO driven pumps provide pressures up to ($$$$$)

A

1000 psi

5
Q

($$$$$) pumps are the simplest of all fire apparatus pumps from a stand point of design.

A

Rotary type

6
Q

The ($$$$$) consists of two gears that rotate in a tightly meshed pattern inside a water tight case.

A

Rotary gear pump.

7
Q

The ($$$$$) is constructed with movable elements that automatically compensate for wear and maintain a tighter fit with close cleanser cues as the pump is used.

A

Rotary vane pumps

8
Q

In this type of pump the rotor is mounted off center inside the housing. The distance between the rotor and the housing is much greater. At the intake than it is at the discharge.

A

Rotary vane pumps

9
Q

The ($$$$$) is classified as a non positive displacement pump because it does not pump a definite amount of water with each revolution.

A

Centrifugal pump

10
Q

Fundamentally the centrifugal pump consists of two parts: an ($$$$) and a ($$$$$)

A

Impeller

Casing

11
Q

The ($$$$) transmits energy in the form of velocity.

A

Impeller

12
Q

He ($$$$) collects the water and confines it in order to convert the velocity into pressure.

A

Casing

13
Q

The impeller rotate very rapidly, generally from ($$$$$$).

A

2000 to 4000 rpm

14
Q

The impeller is mounted off center in the casing. This placement creates a water passage that gradually increases in cross sectional area as it nears the discharge outlet of the pump. This section of the pump is known as the ($$$$$)

A

Volute

15
Q

The greater the speed of the impeller the greater the ($$$$) developed.

A

Pressure

16
Q

Ther are two basic types or centrifugal pumps used by the fire service

A

Single stage and

Two stage

17
Q

Front mount pumps, power take offs separate engine driven, and mid ship transfer pumps use a single impeller and a simple casing to pro vide capacities up to ($$$$$).

A

2000 gpm

18
Q

To minimize the lateral thrust of large quantities of water entering the eye of the impeller a ($$$$$$$) was designed.

A

Double suction impeller

19
Q

The ($$$$$$) takes in water from both sides; the reaction being equal and positive cancels the lateral thrust.

A

Double suction impeller

20
Q

The ($$$$) has an impeller for each stage mounted within a single housing.

A

Multi stage centrifugal pump

21
Q

If a two stage pump is rated at 1000 gpm at 150 psi each of the impellers supplies ($$$$$) to the pump discharge manifold. There the two stream combine, so the total is 1000 gpm at a net pump pressure of 150 psi

A

500 gpm

22
Q

Changing the pump discharge pressure to the ($$$$), position greatly increases the maximum pressure attainable. However increasing pressure results in a corresponding decrease in volume.

A

Series or pressure

23
Q

When the transfer valve is in the ($$$$)position, all the water from the intake manifold is directed into the eye of the first impeller.

A

Pressure

24
Q

The process between switching from pressure to volume is sometimes referred to as ($$$$)

A

Change over

25
Q

The maximum net pump pressure at which the transfer valve should be operated varies. In most cases this recommended maximum pressure will not exceed ($$$$$).

A

50 psi

26
Q

Many power operated transfer valves operate at pressures as high as ($$$$). These pressures can represent extreme danger to personnel and equipment,

A

200 psi

27
Q

The pressure in the volute is much higher than that at the intake side of the pump at the eye of the impeller, so a very close tolerance must be maintained between the pump casing and the hub of the impeller. The opening is usually limited to ($$$) or less.

A

0.01 inch

28
Q

The most common type of packing is material made of rope fibers impregnated with ($$$$) or ($$$$).

A

Graphite

Lead

29
Q

($$$$) are those pumps that are powered by a gasoline or Diesel engine independent of an engine used to drive the vehicle.

A

Auxiliary engine driven pumps.

30
Q

With engine idling and the pump engaged most speedometers read ($$$$$)

A

10 to 15 mph

31
Q

These units are driven by a shaft from the front of the vehicles engine. The shaft turns a hydraulic pump that drives a midship mounted or rear mounted centrifugal water pump. Can be used for stationary or pump and roll operations.

A

Hydrostatic pumps

32
Q

The piping system (as well as the pump itself) must be able to withstand a hydrostatic test of ($$$$) before being placed into service.

A

500 psi

33
Q

NFPA 1901 states that piping should be sized so that pumpers with a capacity of 500 gpm or less should be capable of flowing ($$$$) from their booster tank. Pumpers with capacities greater than 500 gpm s should be able to flow at least ($$$$)

A

250 gpm

500 gpm

34
Q

Discharges to which 1 1/2, 1 3/4, 2 inch hand lines are attached must be secured by at least ($$$$) piping

A

2 inch

35
Q

All valve should be designed so that they are easily operable at pressures of up to ($$$$$).

A

250 psi

36
Q

NFPA 1901 requires that apparatus with a water tank that is less than 1000 gallons in size to have a tank fill line that is at least ($$$$) in diameter. Apparatus with tanks that are 1000 or larger must have at least a ($$$$) tank fill line.

A

1 inch

2 inch

37
Q

The most common type of valve is the ($$$$$) valve that permits full flow through the lines with a minimum friction loss.

A

Ball type valve

38
Q

Gate valve are most commonly operated by ($$$$$$$).

A

Hand wheel

39
Q

NFPA requires all valves on I intakes or discharges that are 3 inches or greater be equipped with ($$$$$$$)

A

Slow acting valve controls

40
Q

NFPA 1901 requires that some type of pressure control device to be part of any fire apparatus pumping system. The device must operate within ($$$$$) after discharge pressures rise and must not allow the pressure to exceed ($$$$) above set level.

A

3 to 10 seconds

30 psi

41
Q

There are many types of relif valves available. One of the most common types uses a ($$$$$)

A

Spring controlled pilot valve

42
Q

The main feature of a ($$$$$) is that it regulates the power output of the engine to match pump discharge requirements

A

Pressure governor

43
Q

Primers fall in to three categories

A

Positive displacement
Exhaust
Vacuum

44
Q

The ($$$$$$) requires a relatively high rpm as compared to a rotary gear primer and can be driving by either mechanical means from the pump transfer gear case or by an electric motor.

A

Rotary vane primer

45
Q

The ($$$$$) operates on the same principle as foam educators. Exhaust gases from the vehicles engine are prevented form escaping to the atmosphere by the exhaust deflector. The gasses are diverted to a chamber where the velocity f the gasses passing through a Venturi creates a vacuum.

A

Exhaust primer.

46
Q

The ($$$$) (sometimes referred to as the($$$$$)) must be connected to the intake side of the pump. This gauge must be capable of measuring either positive pressure or a vacuum.

A

Master intake gauge

Vacuum or compound gauge

47
Q

The MASTER INTAKE GAUGE. Is usually calibrated from ($$$$) positive pressure and from ($$$$) of mercury on the intake side.

A

0 to 600 psi

0 to 30 inches

48
Q

As the vacuum reading approaches ($$$$), the pump is near its capacity and is not able to supply any additional lines.

A

20 inches

49
Q

A MASTER PUMP DISCHARGE GAUGE is also required on a pumper. It must be calibrated to measure ($$$$) unless the pumper is equipped to supply high pressure fog streams; in which case the gauge may be calibrated up to 1000 psi

A

600 psi

50
Q

The ($$$$$) reads the engine speed in revolutions per minute (rpm)

A

Tachometer

51
Q

The ($$$$$) reads the engine speed in revolutions per minute (rpm)

A

Tachometer

52
Q

The ($$$$$$) shows the temp attire of the coolant in the engine that powers the fire pump.

A

Pumping engine coolant temperature indicator

53
Q

The ($$$$$$$) shows that an adequate supply of oil is being delivered to critical areas of the engine that is powering the fire pump.

A

Pumping engine oil pressure indicator

54
Q

The ($$$$$) provides a relative indication of battery condition and alternator output by measuring the drop in voltage as some of the more demanding electrical accessories, such as the primer are used.

A

Voltmeter

55
Q

The most common common throttle used on the pump operators panel is the type of knob that turns. The throttle knob also called a ($$$$$) is turned one way or another until the desired rpm is achieved.

A

Vernier

56
Q

The ($$$$$) is inserted into one of the hoses used in the engine cooling system so that the engine coolant must travel through it as it circulates through the system. The cooler its self contains a number of small tubes similar to those in a steam boiler.

A

Marine type

57
Q

The ($$$$$) is inserted into one of the hoses used in the engine cooling system so that the engine coolant must travel through it as it circulates through the system

A

Marine type

58
Q

($$$$$$) the water being supplied by the pump passes through a coil

A

Immersion type cooler