Chapter 7 - Theoretical Pressure Calculations Activities Flashcards

1
Q

Which of the following would be the first step when determining friction loss in Siamesed hoselines?

A

Compute the total gallons per minute (L/min) flowing.

page 216

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2
Q

What two things are necessary to calculate pump discharge pressure?

A

Nozzle pressure
total pressure loss

page 218

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3
Q

The primary consideration for friction loss is the:

A

volume of water flowing per minute.

page 210

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4
Q

total pressure loss is made up of the __________, __________ , and __________

A

Friction loss, elevation loss, and appliance loss

page 210

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5
Q

friction loss for handline nozzles is generally ___________

A

insignificant

page 213

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6
Q

Which method of determining friction loss involves the use of in-line gauges to measure friction loss at various flows through specific hose layouts?

A

Performing tests

page 211

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7
Q

Which method of determining friction loss relies on the use of mathematical equations or field application methods?

A

Using calculations

page 211

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8
Q

The use of standard formulas and field applications for determining friction loss are generally relied upon for:

A

safe fireground operations.

page 211

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9
Q

customary formula to determine elevation pressure in a multistory building?

A

5 psi × (number of stories - 1)

page 214

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10
Q

For which nozzle type is a pressure of 100 psi (700 kPa) a safe and efficient nozzle pressure?

A

Fog nozzle

page 219

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11
Q

metric formula for elevation pressure loss on the fireground?

A

10 × Height in meters

page 214

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12
Q

When a pumper is being supplied by another pumper, net pump discharge pressure is the difference between pump discharge pressure and:

A

incoming pressure from supply source.

page 219

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13
Q

for which nozzle is a pressure of 50 psi (350 kPa) a safe and efficient nozzle pressure?

A

Solid stream nozzle (handline)

page 219

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14
Q

for which nozzle is a pressure of 50 or 75 psi (350 or 525 kPa) a safe and efficient nozzle pressure?

A

Low pressure fog nozzle

page 219

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15
Q

The current formula for friction loss accounts for the:

A

diameter of the hose, the volume of water flowing, and the length of the hose layout.

page 212

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16
Q

What is the formula for friction loss?

A

FL= C(Q^2)L

page 212

17
Q

Which is the correct formula for Net Pump Discharge Pressure?

A

Pump Discharge Pressure - Intake Reading

page 219

18
Q

customary formula for elevation pressure loss calculations on the fireground?

A

0.5 × Height in feet

page 214

19
Q

When two hoselines of equal length are Siamesed to supply a fire stream, friction loss is approximately:

A

25 percent less than that of a single hoseline at the same nozzle pressure.

page 216

20
Q

In the formula for friction loss, the “L” refers to:

A

hose length.

page 212

21
Q

when flowing 350 gpm (1 400 L/min) or greater there is a loss of ________ for each appliance, other than master stream devices.

A

10 psi (70 kPa)

page 213

22
Q

Pressures for standpipe operations for fire departments may be labeled on ________ of the fire department connection.

A

the faceplate

page 216

23
Q

When determining pressure loss for elevated waterways, the elevation of the master stream:

A

must be considered as part of the total pressure loss.

page 218

24
Q

friction loss for master stream appliances

A

25 psi (175 kPa) for all appliances

page 213

25
For which nozzle is a pressure of 80 psi (560 kPa) a safe and efficient nozzle pressure?
Solid stream nozzle (master stream) page 219
26
Which is the correct customary formula for determining pump discharge pressure?
Nozzle pressure plus total pressure loss page 218