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Engineer Written > POSCORP's Assessment #1- "To get acuainted" > Flashcards

POSCORP's Assessment #1- "To get acuainted" Flashcards

1
Q

the concept or principle upon which a pumping operations is based is that of?

A. utilizing applied pressure to overcome water’s inertia
B. Overcoming friction loss and producing a fire stream
C. generating sufficient suction and propulsion force to draw water into the pump and push it to the fire
D. creating pressure differentials

A

D. creating pressure differentials

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2
Q

water in a fire hydrant with the valve closed is under ______ pressure.

A. static
B. flow
C. residual
D. active

A

A. static

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3
Q

a measurement of the discharge from nozzles and other orificies, or a measurement of the flow in hose or pipe best describes

A. friction loss in any carrier
B. FPM
C. FPS
D. GPM

A

D. GPM

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4
Q

a constant factor depending upon the diameter of the hose and the size of nozzle best describes which of the following terms

A. K factor
B. L factor
C. H factor
D. V factor

A

A. K factor

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5
Q

pressure is best described by which of the following statements

A. the pressure of water as it emerges from the nozzle
B. the pressure of water as it emerges from the pump
C. a measurement of velocity
D. the measurement of the energy in water

A

D. the measurement of energy in water

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6
Q

the pressure control device provided on each pump is designed to control excessive increases in pump pressure

A. in all cases
B. only in cases when two lines are flowing
C. only in cases when one line is flowing
D. when properly set

A

D. when properly set

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7
Q

when using a hard suction, the point at which the maximum volume of water is being received from the hydrant outlet can be determined by

A. feeling the suction when it enters the pump inlet for its soft and flabby feeling
B. reading the compound gauge which will generally be on either side of the zero reading
C. maintaining at least 5-10 pounds pressure on the compound gauge
D. an increase in pump speed without a corresponding increase in pump discharge pressure

A

D. an increase in pump speed without a corresponding increase in pump discharge pressure

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8
Q

friction loss is a common term in the fire service. it is an ever- present factor in a pumping operation which must be overcome. with respect to the amount of friction loss, the determining factors include all of the following except:

A. velocity flow
B. Hose length
C. hose diameter
D. pressure

A

D. pressure

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9
Q

the characteristic of water that is important in handling it for firefighting purposes is its

A. density
B. Volume
C. weight
D. stability

A

A. density

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10
Q

Applied pressure is the primary factor in pumping water to produce fire streams. Applied pressure is produced by

A. atmospheric conditions
B. mechanical pumps
C. gravitational forces
D. Any of the above singly or a combination of all three

A

D. any one of the above singly, or a combination of all three

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11
Q

According to the AOTM, the entire pumping operation is based on creating pressure differentials. a differential is a difference in

A. velocity flow
B. pressure
C. quantity
D. none of the above best describe this differential

A

C. Quantity

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12
Q

Fire stream requirements are best described as

A. quantity of water
B. velocity at the nozzle
C. Both A. and B. above
D. neither A. nor B. above

A

C. Bothe A. and B. above

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13
Q

which of the following LEAST accurately reflects a characteristic of water

A. water is practically incompressible
B. water contracts with the application of heat and expands with the extraction of heat
C. Minerals and salt water add to the density of water
D. Water is subject to the law of gravity

A

B. water contracts with the application of heat nd expands with the extraction of heat

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14
Q

which of the following least accurately reflects an accurate statement concerning pressure

A. pressure may be created mechanically and is the primary factor in pumping
B. pressure is expressed in terms of pounds per square inch
C. pressure will raise to a desired height, overcoming the resistance due to gravity
D. Atmospheric pressure is the force exerted upon the earth and all material on the earth by the weight of water

A

D. atmospheric pressure is the force exerted upon the earth and all materials on the earth by the weight of water

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15
Q

the pressure remaining when the valve is open and the water is flowing best describes

A. static pressure
B. flow pressure
C. residual pressure
D. applied pressure

A

C. residual pressure

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16
Q

it is desired that an effective fire stream penetrate 30 feet through the second floor window of a building from a parking lot next to the building. how many feet from the building should the nozzle be placed (THINK STAIRSTEP)

A. 50 feet
B. 57 feet
C. 60 feet
D. 65 feet

A

50 feet

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17
Q

depending upon the temperature of the water, where a pumper is drafting warm or hot water, its ability to lift water by suction is reduced

A. sightly
B. negligibly
C. greatly
D. by no amount whatsoever

A

C. greatly

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18
Q

fifty feet of 2 1/2’’ hose is laid into a sprinkler system. several heads in the building have popped, but the amount of water flowing has not been determined, no fire showing, the engine pressure should be

A. 0 psi
B. 100 psi
C. 125 psi
D. 150 psi

A

B. 100 psi

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19
Q

for a given velocity of flow, the friction loss in fire hose ________ the pressure.

A. varies directly as
B. varies as the square of
C is inversely proportional of
D. is independent of

A

D. is independent of

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20
Q

for the same discharge, friction los of water flowing in hose varies inversely as the

A. diameter if hose
B. square of the diameter
C. cube of the diameter of the hose
D. fifth power of the diameter of the hose

A

fifth power of the diameter if the hose

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21
Q

Net pump pressure while drafting is

A. discharge pressure minus suction pressure
B/ discharge pressure plus FL in discharge hose
C. discharge pressure plus FL in the suction hose plus the lift PSI
D. none of the above

A

C. discharge pressure plus FL in the suction hose plus the lift psi

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22
Q

the rate of discharge from a nozzle on a loaded line chiefly depends upon the

A. length of the line and the shape of the nozzle
B. shape of the nozzle and the velocity of the flow
C. diameter of the hose and the length of the line
D. area of the nozzle and the velocity of flow

A

C. diameter of the hose and the length of the line

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23
Q

In pumping, the use of parallel lines of 2 1/2’’ hose in lieu of single line of 2 1/2’’ hose, for the same volume of water flow will cut the friction loss down to approx.

A. 12 1/2% of friction of the single line
B. 18% of friction of the single line
C. 28% of friction of the single line
D. 38% of friction of the single line

A

C. 28% of friction of the single line

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24
Q

The greatest vertical reach is ______ degrees, while the horizontal reach is _______ degrees and for a good fire stream ______% must reach a 15’’ circle, while ______% reaches inside a 10’’ circle and excessive psi breaks up a ______ stream quicker than a _______ stream.

A. 75, 30, 90, 75, smaller, larger
B. 60, 30, 90, 75, larger, smaller
C. 30, 75, 75, 90, smaller, larger
D. 75, 0, 75, 90, larger, smaller

A

A. 75, 30, 90, 75, smaller, larger

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25
Q

Without excessive friction loss, the maximum efficient water delivery o the various hoses is 1’’______ GPM, 1 1/2’’ _____ GPM, 2 1/2’’ _______ GPM, 3 1/2’’____ GPM

A. 30, 100, 250, 750
B. 50, 150, 250, 900
C. 50, 100, 225, 600
D. 30, 100, 225, 650

A

A. 30, 100, 250, 750

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26
Q

Friction loss in a given horizontal line may be determined by

A. Velocity plus engine pressure
B. Nozzle pressure plus engine pressure
C. Engine pressure minus nozzle pressure
D. Velocity minus engine pressure

A

C. Engine pressure minus nozzle pressure

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27
Q

When a nozzle on a long line of hose is replaced by one of smaller diameter and the engine pressure remains the same, the nozzle pressure would

A. Increase
B. Decrease
C. Remain the same

A

A. Increase

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28
Q

For a quick calculation, the general rule is to allow one foot of range for each pound of pressure at the nozzle. It will be found that this rule gives results which are

A. Fairly accurate for any pressure obtainable with most apparatus
B. More accurate for the lower pressures than for the higher pressures
C. More accurate for the higher pressures than for the lower pressures
D. Satisfactory in determining range from known nozzle pressures but unsatisfactory for the reverse process.

A

C. More accurate for the higher pressures than for the lower pressures

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29
Q

When pumping from a hydrant, cavitation in the pump may be indicated y all the following conditions except one. That exception is

A. The collapsing of the soft suction
B. A decreasing pump discharge pressure
C. An increasing engine speed, but not increase in discharge pressure
D. The suction pressure gauge shows an increasing vacuum

A

B. A decreasing pump discharge pressure

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30
Q

In a centrifugal pump, under normal pumping conditions, an air leak would most often be the specific cause of which of the following problems

A. Insufficient pressure
B. Failure to prime properly
C. Low pump capacity
D. Pump speed too high

A

B. Failure to prime properly

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31
Q

A basement is filled with 4000 gallons of water. The water is being pumped out at the rate of 800 GPMs, but water is entering the basement at the rate of 600 GPMs. Approximately how long will it take to remove this 4000 gallons of water from the basement?

A. 10 minutes
B. 20 minutes
C. 30 minutes
D. 60 minutes

A

B. 20 minutes

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32
Q

As it applies to driving heavy apparatus, gear spot is

A. That point, determined by engine speed, at which the transmission should be shifted
B. The difference between the gear ratios of a road transmission expressed as a percentage
C. The number of RPMs increases in engine speed necessary when down shifting
D. The number of RPMs reduction in engine speed necessary when down shifting

A

A. That point, determined by engine speed, at which the transmission should be shifted

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33
Q

When operating a diesel powered fire apparatus, the only time the compression release should be used is

A. In difficult braking situations, such as steep downhill grade
B. To start the engine, if necessary
C. To quickly stop the engine
D. In each of the above situations

A

B. To start the engine, if necessary

34
Q

After suction have been made up, a tie rope is used to secure them and to take the weight of the couplings. The drill manual states to use which of the of the following knots in securing the rope to the hard suction?

A. Running bowline and clove hitch
B. Timber hitch and sheet bend
C. Half hitch and double overhand
D. Sheepshank and two half hitches

A

A. Running bowline and clove hitch

35
Q

a rapid drop in pressure reading on the suction gauge, during pumping operations at a greater alarm residential fire, most probably indicated that

A. Working firefighting line have been shutdown
B. The pump is running away from the water
C. Caged lines hav been laid to elevated areas
D. Additional pumpers have started pumping from other hydrants

A

D. Additional pumpers have started pumping from other hydrants

36
Q

In a water relay situation, shut down are initiated at

A. The nozzle
B. The source of supply
C. Either A or B; it does not matter
D. A if pending on an upward incline from the supply source; B under all other circumstances

A

B. the source of supply

37
Q

High velocity streams of water generate turbulence causing friction between water particles. According to the NFPA handbook, this type of fiction accounts for what % of pressure loss in a good fire hose

A. 10
B. 30
C. 60
D. 90

A

D. 90

38
Q

A dept. triple combinations main pump is connected to a hydrant which shows a stati pressure on the pumps compound gauge of 120 psi, and the first line to be supplied has a 1 1/4’’ tip with 50 psi NP desired with water flowing and proper pump pressure established, the compound gauge indicates a hydrant flow pressure of 100 psi. If no other pumps are withdrawing water from hydrants in the immediate area, the number of additional 1 1/4’’ streams at 50 psi per NP which the pump could most reasonably be expected to supply is

A 0
B. 1
C, 2
D. 3

A

C. 2

39
Q

When making a supplemental suction connection to a double hydrant whose outlet to which the pump is connected is operating at capacity, it is usually best to begin by

A. Shutting down the pump
B. Removing the pump inlet cap
C. Connecting hose lines or hard suctions to be used to the unused outlet of the hydrant
D. Advancing the throttle of the pump until the pump is drawing a vacuum

A

C. Connecting the hose lines or hard suctions to be used to the unused outlet of the hydrant

40
Q

Most Dept. triples have a main pump rated at

A. 1200 GPM at 125 psi
B. 1250 GPM at 150 psi
C. 1300 GPM at 125 psi
D. 1500 GPM at 150 psi

A

D 1500 GPM at 150 psi

41
Q

In deciding whether to use a straight stream of a spray stream to extinguish a fire, it is usually last important to consider the

A. Size of the fire
B. Type of material that is burning
C. Amount of time that the fire has been burning
D. Distance from the source of the stream or spray to the heated air surrounding the fire

A

C. Amount of time that the fire has been burning

42
Q

Water supply requirements of sprinkler systems can generally be determined most accurately for

A. Deluge systems
B. Dry- pipe systems
C. Wet-pipe systems
D. Pre- action systems

A

A. DELUGE SYSTEMS

43
Q

The net pump pressure of a centrifugal pump operating from. Hydrant can be calculated by

A. Subtracting the friction los of he pump due t slippage from the intake pressure ( hydrant flow pressure)
B. Subtracting the indicated (gauge) discharge pressure from the intake pressure ( hydrant flow pressure)
C. Subtracting the intake pressure (hydrant flow pressure) from he intake (gauge) discharge pressure
D. Adding the intake pressure (hydrant flow pressure) from the indicated (gauge) discharge pressure

A

C. Subtracting the intake pressure (hydrant flow pressure) from the indicated (gauge) discharge pressure

44
Q

If the first pump in a two- stage centrifugal pump delivers after at the rate of 500 GPM as 100 psi to the second pump, the second pump will discharge 500 GPM as most nearly

A. 100 psi
B. 200 psi
C. 300 psi
D. 400 psi

A

B. 200 psi

45
Q

Adiabatic compression can cause devastating explosions but when controlled is the basis for the operation of a

A. Centrifugal fire pump
B. Diesel engine
C. Two- cycle engine
D. Gasoline engine

A

B. Diesel engine

46
Q

During a relay operation, pump operator M receives an arm signal from the operator next up the line, consisting of an up and down wave of th outstretched arm. If operator M is unable to comply with the request so signaled, he should reply with a signal consisting of

A. The same movements
B. A side- to- side wave of the outstretched arm
C. An inverted “V” made by placing arms overhead with hands touching
D. Hands overhead and widespread, palms toward the operator next up the line

A

B. A side- to- side wave of th outstretched arm

47
Q

Of the following hose layouts, the one which is most properly regarded as a capacity layout for a 100 GPM class A pumper is

A.two 2 1/2’’ lines each 800’ long, siamized in 100’ of single 2 1/2’’ line laid into a cellular nozzle at 80 psi nozzle pressure
B. One 3 1/2’’ line 600’ long laid into an LAFD underwharf nozzle at 80 psi nozzle pressure
C. Three 2 1/2’ lines each 1000’ long laid into standpipe with a small Brennan distributor attached to 100’ of 2 1/2’’ hose used the second floor at 80 psi nozzle pressure for a working warehouse fire
D. One 3 1/2’’ line 400’ long wyed into two 2 1/2’’ lines 200’ long int a portable monitor equipped with a ‘’ tip at 80 psi nozzle pressure, with a 1 3/4’’ hand line serving as a back up

A

D. One 3 1/2’’ line 400’ long wyed into two 2 1/2’’ lines wit 200’ long into a portable monitor equipped with a 2’’ tip at 80 psi nozzle pressure, with a 1 3/4’’ hand line serving as a back- up

48
Q

During a relay operation, an operator at the source of supply gives a visual signal by waving his outstretched arm from side to side. This signal would properly be made to indicate hat he

A. Must shut down temporarily
B. Is going to charge to line
C. Is unable to increase pressure
D. Is having mechanical difficulty

A

C. Is unabl to increase pressure

49
Q

Cavitation in a centrifugal pump such as found in LAFD triple apparatus usually occurs in what specific part of the pump, at the

A. Impeller eye, just in front of the leading edge of the impeller blade.
B. Very outside of the impeller blade
C. Point where the water enters the discharge passageway
D. Impeller eye in back of the leading edge of the impeller blade

A

D. Impeller eye n back of the leading edge of the impeller blade

50
Q

The adjustment knob on a 2 1/2’’ pressure reducing valve (Gleason) will allow a maximum of

A. 200 lbs discharge pressure
B. 250 lbs of discharge pressure
C. 300 lbs of discharge pressure
D. 350 lbs of discharge pressure

A

C. 300 lbs of discharge pressure

51
Q

If pressure drop 10% on the compound gauge, you will most likely be able to supply how many times the quantity of water that you are currently pumping?

A. 2
B. 3
C. 4
D. 5

A

B. 3

52
Q

When the compound gauge ends 18” of vacuum, the after in a section hose will rise to a height of

A. 18 feet
B. 19 feet
C 20.3 feet
D. 21.6 feet

A

C. 20.3 feet

53
Q

The discharge gauges on the engineer panel will record pressure to a maximum of

A. 300 psi
B. 400 psi
C. 500 psi
D. 600 psi

A

D. 600 psi

54
Q

The formula that best explains the theory that when pumping at a constant pressure, the quantity of water is directly proportional to the speed of the pump is written as

A new quantity = new pump speed/ old pump speed + old quantity
B. New quantity= old pump speed/ new pump speed + old quantity
C. New quantity= old pump speed/ new pump speed x old quantity
D. New quantity= new pump speed/ old pump speed x old quantity

A

D. New quantity= new pump speed/ old pump speed x old quantity

55
Q

Engine 201 is connected to a hydrant with a flow pressure of 80 psi. Engine 201 is supplying Engine 202. Engine 202 has a pump pressure of 150 psi and a discharge pressure of 250 psi. Discounting ALL friction loss in supply lines, pumps, fittings, etc., the pump pressure of Engine 201 is _____ and the two engines can be described as pumping in _______

A. 70 psi, parallel
B. 70 psi, series
C. 100 psi, series
D. 100 psi, parallel

A

B. 70 psi, series

56
Q

An engineer assigned to supplement the high- rise fire pumps in a 25 story high rise building with a conformed fire on the 12th floor should pump an initial pump pressure of _______ psi. Which one of the following best completes the missing info?

A. 150
B. 175
C. 250
D. 275

A

B. 175

57
Q

Which of the following is not a correct size siphon ejector used on this dept:

A. 1”
B 1 1/2’’
C. 2 1/2’’
D. 3 1/2’’

A

D 3 1/2’’

58
Q

If sprinkler heads hat operate under 50 psi are opened, the total discharge from the sprinklers will most nearly be

A. 40 GPM
B. 300 GPM
C. 600 GPM
D. 750 GPM

A

C- 600 GPM *

59
Q

That portion of a siphon ejector in which the velocity of the water is converted to a pressure greater than the suction pressure, and is lower than the inlet pressure is called the…

A. Diffuser
B. Foot valve
C. Suction chamber
D. Nozzle

A

A. Diffuser

60
Q

When using a siphon ejector, the discharge head in feet is determined by measuring the distance in elevation from the water source to the

A. Bottom of the pump
B. Center of the pump
C. Top of the pump
D none of the above. The distance is from the water source to the height of the nozzle

A

B center of the pump

61
Q

If your company was involved in a helicopter filling operation and your job was t pump through 400’ of 3 1/2’’ hose to the Kam Lok, what engine pressure would you pump?

A. 62 psi
B. 87 psi
C. 110 psi
D. 115 psi

A

D. 115 psi.

( 95 + 5 psi/ section of 4’’ hose)

62
Q

Assuming the height (theoretical) of the center of a pump is 15.8 feet above the water source it is drafting from the compound gauge will most likely indicate ______ inches of vacuum

A. 11
B. 12
C. 13
D. 14

A

D. 14

63
Q

According to the Brush Book (book 99) which one of the following BEST describes the use of a foot valve in a siphon ejector, it

A. Prevents debri from entering the ejector
B. Prevents loss of water or back- flow through the suction
C. Controls the dynamic balance of the jet- flow through the suction
D. Must always be adjusted to at least a positive 2 lbs pressure

A

B. Prevents loss of water or back- flow through the suction

64
Q

When using the 2 1/2’’ pressure reducing valve, you can tell when you have sufficient pressure available on the supply side when

A. You have the indicator bar set for over 100
B. You see water flowing from the overflow
C. The indicator bar is 3/4 visible
D. The adjusting knob locks in place

A

B. You see water flowing from the overflow

65
Q

When using a pressure reducing valve to provide an immediate shutdown you should

A. Move the adjusting knob to 30
B. Reverse the indicator bar
C open the emergency peacock
D. Close the emergency petcock

A

C. Open the emergency petcock

66
Q

All of the following are true regarding centrifugal pumps except

A. Unless it is full f water it will not pump a vacuum
B. The quantity of discharge is interrelated with pump speed
C. Water under pressure on the discharge side of the casing is prevented from flowing back into the pump by the close fit between the casing and the impeller at the suction inlet by rapid movement of impeller and by the equal pressure in the pump casing
D. All of the above are true, there are no exceptions stated

A

D. All of the above are true, thee are no exceptions stated

67
Q

All of the following are true regarding centrifugal pumps except:

A. If pump is stationary it must be primed from the top
B. If pump is running it must be primed at the eye of the impeller
C. Once a hydrant pumps it will deliver large quantities of water from draft without increasing pump speed
D. If speed and performance is low it generally indicates worn clearance rings

A

D. If speed and performance is low it generally indicates worn clearance rings

68
Q

The theoretical pounds- gallons of a pump can be determined by:

A. Adding its capacity in gallons to is rated psi
B. Subtracting its rated capacity from its rated pressure
C. Dividing its rated capacity by its rated pressure
D. Multiplying its rated capacity in gallons by its rated pressure

A

D. Multiplying its rated capacity in gallons by its rated pressure

69
Q

Should the engine speed increase without a corresponding increase in pressure and the most efficient point has been passed, the action of the engine should be to:

A. Increase the throttle of its rated RPM
B. Retard the throttle and switch from volume to pressure and visa- versa
C. Reprise until a solid stream is discharge from the priming pump
D. Close the throttle slowly until pressure gauge indicates a pressure drop, then operate at this pressure

A

D. Close the throttle slowly until pressure gauge indicates a pressure drop, then operate at this pressure

70
Q

All of the following are tru except which one of the following when it comes to pump trouble shooting from the AOTM:

A. The most likely cause of a pump not developing is capacity is low engine horsepower
B. A lift exceeding 22’ should only be attempted at low altitudes with equipment in new condition
C. Debris or dirt on the suction strainer will be indicated by a high vacuum of the suction gauge
D. At draft maintain 60 psi discharge pressure t avoid losing prime

A

D. At draft, maintain 60 psi discharge pressure to avoid losing prime

71
Q

Water is prevented from leaking past the pump packing into the pump transmission by the

A. Wear ring
B. Inter- stage seal
C. Flinger ring
D. Throwout bearing

A

Flinger ring

72
Q

The centrifugal pumps body casting has two volutes, separated by a/an
A. Wear ring
B. Inter- stage seal
C. Flinger ring
D. Throwout bear

A

B. Inter- stage seal

73
Q

In theory, switching from parallel to series with a 2 stage centrifugal pump, will cause the pressure to

A. Double
B. Triple
C. Quadruple
D. Increase to the square of the speed of the pump

A

A. Double

74
Q

Which of the following provide flexibility to the apparatus when it is traveling over uneven surfaces

A. Universal joints
B. Propeller shaft
C. Differential
D. Road transmission

A

A. Universal joints

75
Q

Failure of the pump to deliver its rated capacity, in pressure, may indicate that its ________ are badly worn

A. Wear ring
B. Inter stage seal
C. Flinger ring
D. Throwout bearing

A

A. Wear ring

76
Q

According to the AOTM, the practical limit of draft at sea level is approx. _______ feet, while according to the firefighters wild land handbook the maximum limit of draft is ______ feet at sea level.

A. 34: 22
B. 22: 10
C. 23:15
D.20:10

A

C. 23:15

77
Q

A relay is a multi- company operation. If the relay covers just over 5/10ths of a mile the minimum number of pumps required would be

A. 5
B. 6
C. 7
D. 8

A

C. 7

78
Q

Effective reach of a fire stream varies in feet approx. ______ times the nozzle pressure at 50 psi.

A. 1 3/4
B. 1 1/2
C. 1 1/4
D. One

A

B. 1 1/2

79
Q

For the same discharge, the friction loss in three Siamesed 2 1/2” hose lines each 100 feet long is most nearly the same as the friction loss in one 3 1/2” hose line each _____ feet long

A. 50
B 75
C. 103
D. 217

A

B. 75

80
Q

In the above problem it can be safely stated that the friction loss in the three siamesed 2 1/2” lines when compared to one 3 1/2” lines is how much less

A. 1/3
B. 1/2
C. 2/3
D. 3/4

A

D. 3/4

81
Q

The total friction loss in 300’ of 2 1/2” hose discharging 100 GPM is most nearly

A. A. 3
B. 6
C. 9
D. 12

A

C. 9

82
Q

According to TB #63, which of the following is a correct method in determining what pressure is to be pumped to a high rise building

A. Locate fire dept connection(FDC) sign near the inlets
B. Consult with the building engineer
C. View discharge gauge of buildings fire pump when it’s running
D. All of the above are correct statements

A

D. All of the above are correct statements

Engineer Written (33 decks)

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