07 - IFSTA Chapter 07 Flashcards
1
Q
What device is used to measure water flow pressure in PSI?
A
Pitot tube and gauge
2
Q
Which of the following gets 25 PSI loss added when calculating PDP?
A
Flow greater than 350 PSI
3
Q
When two hoselines of equal length are Siamesed, friction loss is approximately what percentage less than a single hoseline?
A
25 percent
4
Q
Friction loss in cases where the total flow through the appliance is less than what is generally considered insignificant?
A
350 GPM
5
Q
What is the assumed PSI lost for appliances flowing more than 350 GPM (other than master streams)?
A
10 PSI
6
Q
What is the term used to describe the difference between the nozzle and the pump?
A
Elevation Loss
7
Q
In fire ground math, what is the constant used per 10 feet when calculating elevation loss?
A
5
8
Q
When there are two hoselines in place and the diameters vary, which hoseline’s friction loss is used for PDP?
A
The line with the higher friction loss
9
Q
When calculating friction loss for wyed hoselines of equal length and diameter, with the same nozzle, what is the process to find Q in the FL equation?
A
Add the flow of both attack lines before dividing by 100
10
Q
What is the coefficient used for a 1” booster line?
A
150
11
Q
Which of the following does not factor in to pump discharge pressure?
A
Hydrant Pressure
12
Q
What is the coefficient for an 1 3/4” line?
A
15.5
13
Q
What is the term for the addition of friction loss, loss or gain due to elevation, as well as any applicable appliance loss?
A
Total Pressure Loss
14
Q
What is the amount of pressure being produced by the pump?
A
Net Discharge Pressure
15
Q
Which of the following is not a variable when calculating friction loss?
A
Nozzle Pressure
16
Q
What device measures the flow of water in GPM or L/min?
A
Flow Meter
17
Q
Which of the following is not a variable when calculating pump discharge pressure?
A
Hydrant Pressure
18
Q
What is the unit of measurement that pump discharge pressure is calculated in?
A
kilopascals
19
Q
What is the elevation loss that a DPO would use if the engine was 100 feet below the nozzle?
A
50 psi
20
Q
What is the coefficient for a 4.5” line?
A
0.1
21
Q
What is the primary consideration Friction Loss is caused?
A
Volume of water flowing per minute
22
Q
What is created when friction loss, elevation loss and appliance loss are combined?
A
TPL
23
Q
Friction loss may be determined by using calculations or:
A
Performing tests using equipment
24
Q
Calculations method relies on the use of math equations or field application methods that may not be accurate. What are you trying to determine?
A
Friction loss
25
What is the only truly accurate method for determining pressure loss in a particular hose lay?
Measuring the pressure at both ends of the hoseline & subtracting the difference
26
The metric friction loss formula accounts for these factors except:
Friction loss in pounds per square inch
27
What do some jurisdictions do in order to achieve more accurate results to determine FL coefficients?
Performing tests using equipment they use in the field
28
Which device is used when testing for friction loss using a pitot tube?
Smooth bore nozzle
29
Which statement is most accurate about friction loss for handlines?
Is generally insignificant
30
What should be used in conjunction with a flowmeter when testing for friction loss?
Any type of nozzle
31
What is the metric formula for elevation pressure loss?
10H
32
Pump discharge pressure should be set based on what?
Higher pressure of hoseline
33
When two hoselines of equal lenght are siamesed to supply a fire stream, What is the approximate percentage lost compared to a single line at the same nozzle pressure
25 percent
34
A driver/operator can reference the pressures to supply an FDC here except:
Personal phone
35
What is the metric formula used to determine elevation pressure in a multistory building?
35kpa x(# of stories -1)
36
The pressure loss of each apparatus will vary slightly based on:
Manufacturer and truck to truck
37
What pressure does a low pressure fog nozzle can operate?
50 or 75 psi
38
What is the friction loss coefficient for two 3 inch hose of equal lenght?
0.2
39
What is the formula for net pump discharge pressure?
Pump discharge pressure- intake reading
40
You are supplying a standpipe system with a hoseline on the 9th floor. What is the elevation pressure loss using the metric formula?
280kpa
41
What is the NFPA standard for Fire Apparatus Driver/Operator Professional Qualifications?
NFPA 1002
42
Friction loss and elevation loss are combined with what to create Total Pressure Loss?
Appliance Loss
43
What is the formula for friction loss?
FL = CQ2L
44
What nozzle is required to be used when testing flows with a pitot tube?
Smooth bore
45
What is the appliance loss when flowing less than 350 gpm's?
0
46
What is the appliance loss when flowing over 350 gpm's?
10
47
What is the appliance loss when flowing a master stream?
25
48
What is the formula for elevation pressure loss?
EP = 0.5H
49
What is the formula for elevation pressure loss in a multistory building?
EP = (5 psi) x (Number of stories -1)
50
When two hose lines of equal length are Siamese to supply a fire stream, friction loss is decreased by approximately how much?
25 percent
51
Pump discharge pressure is composed of what two things?
NP + TPL
52
What is a safe and efficient nozzle pressure for a solid stream nozzle for a hand line?
50 psi
53
What is a safe and efficient nozzle pressure for a master stream solid stream nozzle?
80 psi
54
What is a safe and efficient nozzle pressure for a fog nozzle?
100 psi
55
What is the formula for Net Pump Discharge Pressure?
NPDP = PDP - Intake reading
56
What is the friction loss coefficient for an 1 3/4 hose with 1.5 couplings?
15.5
57
What is the friction loss coefficient for 3 inch hose with 2.5 inch couplings?
0.8
58
What is the friction loss coefficient for 4 inch hose?
0.2
59
What is the friction loss coefficient for a 4 inch standpipe?
0.374
60
What is the friction loss coefficient for a 5 inch standpipe?
0.126
61
What is the primary function of the driver/operator on the fireground?
provide water to attack crews in sufficient volume and pressure
62
How does a driver operator precisely determine the friction loss of various flows through specific hose layouts?
in-line gauges
63
What is the only trye accurate method for determining pressure loss in a particular hose lay?
measuring the pressure of the line on both ends
64
All of the following are measuring devices that can be used to record an accurate pressure in a hose lay except for:
clapper valve
65
While preforming testing procedures to determine friction loss in a hoseline, all in line gauges should be calibrated in increments of:
5 psi
66
Elevation pressure is the difference between:
the nozzle and the pump
67
When charging multiple handlines of equal lengths and equal diameter, friction loss should be calculated for:
one line
68
While supplying multiple hoselines, the driver should set the pump discharge pressure based on the hoseline with:
the greatest pressure requirement
69
What best describes net discharge pressure?
the difference between the PDP and incoming supply source
70
How can a driver/operator achieve a lower pressure in a handline that does not require the maximum pressure from the pump?
gate-down the line
71
what is the presumed loss for all master stream appliances?
25psi
72
When using a manifold appliance and the hose lengths are unequal in diameter or length, total pressure loss in the system is based on:
the highest pressure loss in any line
73
the combination of friction loss, elevation pressure loss and appliance loss is referred to as:
total pressure loss
74
what is the safe and efficient operating nozzle pressure for a solid stream handline nozzle?
50 psi
75
what is the safe and efficient operating pressure for a master stream with a solid stream nozzle?
80 psi
76
what is the safe and efficient nozzle pressure for a low pressure fog nozzle?
50
77
what kind of nozzle should a driver/ operator use in conjunction with a pitot tube to measure water flow pressure?
smooth bore nozzle
78
what is the net pump discharge pressure measured in?
pounds per square inch
79
what is the formula to determine net discharge pressure?
PDP-intake reading
80
What is the presumed pressure loss of an appliance that is not involved in a master stream operation?
10 psi
81
What is the primary consideration to effectively provide water for fire streams?
The volume of water flowing per minute
82
Total pressure loss (TPL) is created by combining what?
Friction loss, elevation pressure loss, and appliance loss
83
The numbers in the total pressure loss equation are expressed in what way?
Pounds per square inch (PSI)
84
What is the only truly accurate method for determining pressure loss in a hoseline?
Measure the pressure at both ends of the hoseline and subtract the difference
85
In the friction loss formula, the length is measured & multiplied in what hose distance?
100 foot lengths
86
It is assumed that there is a 10 PSI loss for each appliance in an assembled hoseline when flowing what volume of GPM's?
350 GPMs or greater
87
What is the appliance loss for a master stream device, regardless of flow?
25 PSI
88
To determine elevation loss in a multi-story building, which of the following formulas is generally used?
EL = (5PSI)(Number of stories - 1)
89
When the flowing hoselines of different diameters, what calculation(s) should be made to determine PDP?
Calculations must be made for each hoseline
90
When two hoselines of equal length are siamesed to supply a fire stream, friction loss is reduced by how much than that of a single hoseline?
25 percent
91
When pumping hoselines of different lengths and diameters, what does the TPL become based on?
The hoseline with the highest TPL
92
To determine TPL in unequal length wyed hoselines, the friction loss from the supply line is added, along wih the wye, elevation loss, and the wyed line with what?
The greatest amount of friction loss
93
When considering pressure loss in an elevated waterway/master stream, a driver/operator should assume an appliance loss of how much?
25 PSI
94
The actual pressure of the water as it leaves the pump and enters the hoseline is known as:
Pump discharge pressure
95
The actual amount of pressure being produced by the pump is known as:
Net pump discharge pressure
96
A smoothbore nozzle for a handline has a starting nozzle pressure of:
50 PSI
97
How is the net pump discharge pressure calculated?
NPDP = PDP - intake reading
98
The coeffieient for a 1" booster line is:
150
99
The coeffieient for a 4" supply line is:
0.2
100
3" hose with 2«" couplings has a coefficient of:
0.8
101
When charging different size hose lines, friction loss needs calculated for each line and then set for what?
Higher pressure line
102
What is the formula for friction loss?
FL=C(Q^2L)/100
103
What is the formula to determine Pump Discharge Pressure?
NP+TPL
104
When calculating elevation pressure in a multi story building, you must subtract how many floors from the actual fire floor?
1
105
What is the nozzle pressure for a fog nozzle?
100 PSI
106
What is the appliance loss for master stream appliances?
25 PSI
107
When using more than one hoseline of equal length and same diameter, friction loss calculations need to be made for what?
Only one line
108
There is no calculated loss for flowing less than how many GPMs?
350 GPM
109
What is the nozzle pressure for a master stream solid stream nozzle?
80 PSI
110
What PSI loss is added to calculations for flows over 350 GPM?
10 PSI
111
Friction loss, elevation loss and appliance loss are part of what calculation?
Total pressure loss
112
What is the safe nozzle pressure for a solid stream handline?
50 PSI
113
When two hoselines of equal length are Siamesedto supple a fire stream, friction loss is approximately how much less than that of a single hoseline?
25 percent
114
What is the formula for calculating Net Pump Discharge Pressure
PDP-intake reading
115
What is the IFSTA friction loss coefficient for 1 3/4 inch single hoseline?
15.5
116
What is the friction loss coefficient for 2 1/2 inch single hoseline?
2
117
What is the friction loss coefficient for 3 inch single hoselines?
0.8
118
What is the friction loss coefficient for 4 inch single hoseline?
0.2
119
What is the elevation pressure loss for hoseline working on the 6th floor of a building?
25 PSI
120
What is the friction loss coefficient for two 3 inch hoselines?
0.2
121
What is the primary factor when considering friction loss?
Volume of water flowing per minute
122
What is the formula for friction loss?
FL=C(Q^2L)/100
123
What is the formula to determine Pump Discharge Pressure?
NP+TPL
124
When calculating elevation pressure in a multi story building, you must subtract how many floors from the actual fire floor?
1
125
What is the nozzle pressure for a fog nozzle?
100 PSI
126
What is the appliance loss for master stream appliances?
25 PSI
127
Which of the following is true regarding hose used when determining friction loss coefficients?
Use the actual hose that will be used on the fire ground
128
There is no calculated loss for flowing less than how many GPMs?
350 GPM
129
What is the nozzle pressure for a master stream solid stream nozzle?
80 PSI
130
What PSI loss is added to calculations for flows over 350 GPM?
10 PSI
131
Friction loss, elevation loss and appliance loss are part of what calculation?
Total pressure loss
132
What is the safe nozzle pressure for a solid stream handline?
50 PSI
133
When two hoselines of equal length are Siamesed to supply a fire stream, friction loss is approximately how much less than that of a single hoseline?
25 percent
134
What is the formula for calculating Net Pump Discharge Pressure
PDP-intake reading
135
What is the IFSTA friction loss coefficient for 1 3/4 inch single hoseline?
15.5
136
What is the friction loss in a standpipe operation for two 100 foot sections of 3 inch flowing 175 GPM?
0.61
137
What is the generic term applied to any nozzle, wye, siamese, deluge monitor or other peice of hardware used in conjunction with fire hose?
Appliance
138
When using wyed hoselines, what must be the same in order to avoid having different nozzle pressures?
Same length and diameter
139
What is the safe and efficient nozzle pressure for a low pressure fog nozzle?
50 PSI
140
What is the friction loss coefficient for two 3 inch hoselines?
0.2
141
Driver/operates need to know the amount of friction loss and pressure loss in fire hose in order to?
effectively provide water for fire streams
142
The calculation of friction loss must take into account the?
length and diameter of the hoseline
143
The combination of friction lose, and loss associated with appliance is referred to as?
total pressure loss
144
What are the two ways of determining friction loss?
calculations and performing tests
145
Which of the following is the formula for determining friction loss?
FL= CQ^2L
146
When testing for friction loss coeffients, department that use a flowmeter should use?
any type of nozzle
147
When testing for friction loss coeffients, department that use a pitot tube should use?
smooth bore nozzle
148
Per this textbook, 0 psi is assumed loss for flows less than?
350 gpm
149
What loss can be assumed for each appliance when flowing 350 gpm or greater
10psi
150
What loss can be assumed for all master streams appliance, regardless of the flow that will be used?
25 psi
151
Elevation pressure is created by elevation differences between?
the nozzle and the pump
152
What is the formula for elevation pressure loss?
0.5 x height in feet
153
What is the formula for elevation pressure in a multi-story building?
5 psi x (number of floors -1)
154
What is the pressure loss due to elevation for a hoseline operating at the top of a 150 foot hill?
75 psi
155
A hoseline operating on the 12 floor structure fire is connected to the buildings standpipe system. What is the total pressure loss due to elevation?
55 psi
156
When determining friction loss in multiple hoselines of equal length and whose diameters are the same, it is necessary to perform calculations for?
only one line
157
When the diameters of hoselines vary, frication loss calculations must be made for each hoseline, and then set based on the?
higher pressure
158
Which of the following is MOST likely to have predetermined pressures in department policies and preincident plans?
standpipe operations
159
The pump discharge pressure at the apparatus must be enough to overcome?
the sum of all pressure losses
160
Which of the following is a safe and efficient nozzle pressure for a fog nozzle?
100 psi
161
What is the primary function of the driver/operator on the fireground?
To provide water to attack crews in sufficient volume and pressure
162
What factors must drivers consider to have proper pump discharge pressure for fire streams?
Friction loss and elevation
163
What is necessary to know in order to effectively provide water for fire streams?
The amount of friction loss in the fire hose and the pressure loss or gain due to elevation
164
What is the primary factor in determining friction loss?
The volume of water flowing per minute
165
What is the combination of friction loss, elevation pressure loss, and appliance loss?
Total pressure loss
166
What is the most precise way to determine friction loss?
Using an in-line gauge at the beginning and end of a hose layout and subtracting the difference
167
What does the formula for friction loss account for?
Diameter of the hose, volume of water flowing and length of the hose
168
What does "C" stand for in the friction loss formula?
Friction Loss Coefficient
169
When testing hose to determine the friction loss coefficients, what should be done to make it more accurate?
Test one diameter at a time as well as those of the same construction and manufacture
170
What type of gauge measures water flow pressure in psi?
Pitot tube and gauge
171
What type of gauge measure water flow in volume?
Flowmeter
172
How much friction loss is assumed for less than 350 gpm of flow?
0 psi
173
When considering elevation pressure, what starting and ending point is measured for the difference in elevation?
The nozzle and the pump
174
In a multistory building, how do you rapidly determine the elevation loss?
5psi X (Number of stories-1)
175
How many calculations are needed for multiple hoselines of equal length?
1
176
What does the driver need to do if there are multiple hoselines of different length and/or different sizes?
Calculate the friction loss for each hose line
177
When determining pressure loss, what does the driver account for master stream devices?
25psi
178
How much pressure loss is accounted for using an elevated waterway?
25psi
179
What formula is made up of nozzle pressure and total pressure loss?
Pump Discharge Pressure
180
What is the nozzle pressure for a solid stream nozzle on a master stream?
80 psi
181
what is a safe and efficient nozzle pressure for a solid stream nozzle(handline)?
50psi
182
what is a safe and efficient nozzle pressure for solid stream nozzle(master)?
80psi
183
what is a safe and efficient nozzle pressure for a fog nozzle(handline)?
100psi
184
what is a safe and efficient nozzle pressure for low pressure fog nozzle(master)?
50-75psi
185
what do you get when you add nozzle pressure plus total pressure loss?
pump discharge pressure
186
what is the constant in friction loss formula?
there is none
187
what flow amount do you start using appliance loss?
greater 350gpm
188
when finding elevation loss in multistory buildings, what do you do to the number of stories?
minus 1 from it
189
the difference in what, creates elevation pressure?
nozzle and the pump
190
what is "C" in the friction loss formula?
coefficient
191
what does "L"stand for in friction loss formula
length of hose
192
what hose should be tested for friction loss?
actual fire ground hose
193
what is the elevation pressure loss for a hose line on the 9th floor?
40psi
194
what is the friction loss for 600ft of 4inch hose that is flowing 750gpm?
67.5psi
195
what type of nozzle should a department use when testing friction loss with a flowmeter?
any nozzle type
196
what is friction loss formula
Fl=CQ^2L
197
what type of nozzle should a department use if using a pitot tube to figure friction loss?
smooth bore
198
what is formula for net pump discharge pressure?
pump discharge pressure - intake pressure
199
what the elevation pressure loss of a hose line flowing at the top of a 100 ft hill?
50psi
200
what is the pressure loss for elevated master stream?
25psi
201
Friction Loss + Elevation pressure Loss + Appliance Loss
Total Pressure Loss
202
Total Pressure Loss is expressed in
LBs per sq Inch
203
Measuring pressure at both ends of the hoseline and subtracting the difference
The only accurate method for determining pressure loss
204
diameter of the hose, the volume of water flowing and the length of the hose
Friction Loss
205
C x Q2 x L
Friction Loss
206
Friction Loss in pound per sq inch (psi)
FL
207
Friction loss coefficient
C
208
Flow rate in hundreds of gallons per minute (gpm)(gpm/100)
Q
209
Hose length in hudreds of feet (ft)(feet/100)
L
210
0 Psi friction loss for flows less than
350 gpm
211
Friction loss in applicances 350 gpm or greater (other than master streams)
10 psi
212
Friction loss for master streams
25 psi
213
0.5 x H (Customary)
Elevation Pressure Loss (Customary)
214
Elevation Pressure Loss
EP
215
10 x H (Metric)
Elevation Pressure Loss (Metric)
216
Q = Flow rate (gpm or L/min)/100
FL in an equal length wyed line hose layout
217
When two hoselines of equal length are Siamesed to supply a fire stream, friction loss is approximately how much percent less than that of a single hoseline at the same nozzle pressure?
25
218
when considering pressure loss in an elevated waterway, assume how much loss for the waterway and master stream appliance?
25
219
The sum of the pressure loss encountered as well as the required nozzle pressure will be used to determine the
pump discharge pressure
220
NP + TPL
PDP
221
In order to effectively provide water for fire streams, it is necessary to know what?
Friction loss in the hose and elevation
222
The primary consideration for fire streams is ?
A volume of water flow per minute
223
What are the 3 parts to calculating friction loss?
Hose length, Diameter, and appliances
224
What are the 2 parts to Total Pressure Loss?
Friction Loss and elevation
225
The only truly accurate method for determining pressure loss in a hose lay is what?
Measure the pressure at both ends and subtract to find the difference
226
What of the following is NOT used to determine friction loss coefficients?
In line educator
227
Nozzles, wye, Siamese, deluge monitors are considered what?
Appliances
228
Friction loss in cases where the total flow through the appliance is less than WHAT, generally considered to be insignificant?
350
229
There are 3 general friction loss's for appliances. Hose lines below / above 350 PSI and master streams?
0,10,25
230
When using a truck as an elevated standpipe, other than friction loss what must be considered?
Elevation
231
Pump discharge pressure must be sufficient to ?
Overcome all pressure loss
232
Actual pressure of the water as it leaves the pump and enters the hose line is called?
PDP
233
When pumping multiple hand lines, what should the pump operator pump to?
Largest volume hose line
234
When pumping, the difference between the incoming water pressure and discharge pressure is called?
NPDP
235
Friction loss, loss or gain due to elevation, and appliance loss are called ?
Total pressure loss
236
Weather used as a supply line or attached line this is the simplest friction loss calculation?
Single hose line
237
When using multiple hose lines of the same diameter and length, how do you figure Friction loss?
For 1 line
238
When using a wyed hose line what must be done to prevent different nozzle pressures?
Hand lines the same length
239
When using a large hose line to split to make 2 smaller hand lines what appliance is used?
Wye
240
What appliance is used to put 2 or more parallel lines together?
Siamese
241
What is the primary function of the driver/operator on the fire ground?
Provide water to attack crews in sufficient volume and pressure
242
What must the driver/operator know in order to effectively provide water for fire streams?
Friction loss and elevation gain or loss
243
What are two causes of friction loss?
Condition of the hose and couplings and kinks in the hoseline
244
What other factors must the driver/operator account for when making a friction loss calculation?
Length and diameter of hose and any appliances used
245
What is the only truly accurate method for determining pressure loss in a particular hose lay?
Measure the pressure at both ends of the hoseline and subtracting the difference
246
Which of these is not a factor in the formula for friction loss?
Temperature
247
Which of these items is not commonly used when determining friction loss testing?
Gate valve
248
What is the generic term that applies to any nozzle, wye, siamese, deluge monitor, or other piece of hardware used in conjunction with fire hose for the purpose of delivering water?
Appliance
249
What GPM is generally considered to be insignificant for friction loss of the appliance?
Less than 350 GPM
250
What is the appliance loss calculation for each appliance in a hose assembly when flowing 350 gpm or greater?
10 psi
251
What is elevation pressure?
The difference between the nozzle and the pump
252
What is the constant used to multiply the height in the elevation pressure loss calculation?
0.5
253
Which of these is not a factor for determining total pressure loss?
Temperature loss
254
What is the pump discharge pressure based on when the diameters of hoselines vary?
Based on the higher pressure
255
What is needed to overcome friction loss as the rate of flow is increased through a hoseline?
Additional pressure
256
What can be done to accommodate larger volumes of water and keep friction loss rates reasonable?
Two or more parallel hoselines may be laid
257
How much less is the friction loss when two hoselines of equal length are siamesed to supply a fire stream as compared to that of a single hoseline at the same nozzle pressure?
25 percent less
258
What is the term for the actual pressure of water as it leaves the pump and enteres the hoseline?
Pump discharge pressure (PDP)
259
What is a safe and efficient nozzle pressure for a solid stream (handline) nozzle?
50 psi
260
What is the term for the actual amount of pressure being produced by the pump?
Net pump discharge pressure (NPDP)
261
What is the only truly accurate method for determining pressure loss?
Measuring the pressure at both ends of the hoseline and subtracting the difference
262
What does the "C" in the friction loss equation represent?
A predetermined coefficient
263
What does the "Q" in the friction loss equation represent?
The flow rate in hundreds of gallons per minute
264
What does the "L" in the friction loss equation represent?
Hose length in hundreds of feet
265
What is the customary friction loss measured in?
Pounds per square inch
266
Which of the following is a device one would need to determine reliable friction loss coefficients?
Pitot tube
267
What is the generic term applied to any nozzle, wye, deluge monitor used in conjuction with fire hose for the purpose of delivering water?
Appliance
268
According to IFSTA, how many psi should be used when calculating appliance loss for a master stream?
25 psi
269
According to IFSTA, how many psi should be used when calculating appliance loss for an appliance with less than 350 gpm?
0 psi
270
The pressure created by a difference between the nozzle and the pump is what?
Elevation pressure
271
When using the customary formula to caluclate elevation pressure loss, what is the constant?
0.5
272
Which of the folliwing is not included in total pressure loss?
Hoseline Loss
273
When calculating friction loss for multiple hoselines of equal length but different diameter and different discharge pressures are calculated, what discharge pressure should be used?
The higher pressure
274
If different discharge pressures are needed, what can the DPO do to the line that needs the lower pressure?
Gate the valve partially closed
275
When calculating friction loss for two equal lines coming off a gated wye, how does the DPO determine the quantity to use?
Add the two flows together
276
When calculating friction loss for two equal lines coming off a gated wye, which of the following is not added in to the final pump discharge pressure?
25 psi for the appliance
277
When two hoselines of equal length are Siamesed to fupply a fire stream, friction loss is approximately how much less than that of a single hoseline at the same nozzle pressure?
25 percent
278
What is the actual amound of pressure being produced by the pump?
Net Pump Discharge Pressure
279
What us a safe and efficient nozzle pressure for a solid stream handline?
50 psi
280
What is a safe and efficient nozzle pressure for a low pressure fog nozzle?
75 psi
281
What is the main purpose of a fire department pumper?
Provide adequate water pressure for effective water streams
282
What is the NFPA standard for Automotive Fire Apparatus?
1901
283
The NFPA 1901 standard, specifies a minium pump and tank capacity of what?
750 gpm, 300 gallong
284
Pump capacities larger than 750 gpm, increase In increments of what?
250 gpm
285
What NFPA standard specifies the minimum portable equipment that must be carried on all fire department pumpers?
1901
286
Articulating or telescoping devices most commonly combined with pumpers generally range to what height?
50 - 75 feet
287
What type of apparatus' primary purpose is to initiate fire attack on structural and wildland fires?
Initial attack apparatus
288
Mini-pumpers usually have a pump rated capacity of less than how many gpm?
500 gpm
289
Midi-pumpers usually have a gross vehicle weight rating of what?
12,000 pounds
290
Midi-pumpers have a fire pump with a capacity that generally does not exceed what?
1,000 gpm
291
The capacity of a mobile water supply apparatus is not based on which of the following factors?
Rural water areas
292
What type of vehicle often has a pump and tank capacity of 500 gallons or less?
Brush truck
293
Brush trucks often have a tank and pump capacity of what?
500 gallons
294
According to NFPA 1901 aerial apparatus equipped with fire pumps must have a pump rated at a minimum capacity of what?
1,000 gpm
295
Aerial apparatus equipped with a fire pump must also contain a water tank with a capacity of at least what?
300 gallons
296
What type of device is used to convert a vehicles 12 or 24 volt DC current into 110 or 220 volt AC current?
Inverter
297
Inverters are typically used to power what?
Vehicle mounted flood lights
298
What is the most common power source used for emergency vehicles?
Generators
299
What is typically the largest capacity generator?
5,000 watts
300
Scene lighting on apparatus operate within a range of generally how many watts?
300 - 1,000 watts
301
All of the following are included in calculating the "total pressure loss" except:
nozzle pressure
302
Calculating the "total pressure loss" of a hose layout is expressed in:
pounds per square inch
303
How is friction loss precisely calculated?
by preforming tests using equipment and conditions found in the field
304
Completing tests to determine friction loss involves using:
in-line gauges
305
What is the only truly accurate method for determining pressure loss in a particular hose lay?
by measuring the pressure at both ends of the hoseline and subtracting the difference
306
All of the following are included in the current formula to determine friction loss except:
nozzle pressure
307
All of the following are measuring devices used to record test data except:
indicating valves
308
A pitot tube and gauge is used to measure water flow pressure in:
psi and kPa
309
A flowmeter measures water flow in:
gpms
310
What type of nozzle is required when conducting a test to determine friction loss in a hose lay using a pitot gauge?
smooth bore nozzle
311
What type of nozzle is required when conducting a test to determine friction loss in a hose lay using a flowmeter?
any type of nozzle is acceptable
312
When conducting a test to determine friction loss in a hose lay, two in line gauges are required that are calibrated in increments of:
5 psi
313
How many in-line gauges are required to test the friction loss of a hose lay?
2
314
Which of the following hose lays preset the simplest friction loss calculations?
a single hose line
315
What is the approximate friction loss of two hoselines of equal diameter and length are siamesed to supply a fire stream?
approximately 25 percent less than that of a single hoseline
316
Which of the following best describes "Net Pump Discharge Pressure"
The pressure difference between the pump discharge pressure and the incoming pressure from the supply source
317
What is the nozzle pressure of a solid stream handline?
50 psi
318
What is the nozzle pressure of a solid stream master stream?
80 psi
319
What is the nozzle pressure of a low pressure fog nozzle?
50 or 70
320
What is the nozzle pressure of a fog nozzle (per NFPA)?
100 psi
