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Driver Test > Apparatus Cards > Flashcards

Apparatus Cards Flashcards

0
Q

First principle of pressure

A

Fluid pressure is perpendicular to any surface on which it acts

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1
Q

What class of foam is mixed @ 0.1-1.0%?

A 
Class a foam 
Fire attack & overhaul .2-.5%
Exposure protection .5-1%
With air aspirating nozzle .3-.7%
Application with CAFS .2-.5%
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2
Q

Second principle of pressure

A

Fluid pressure @ a point in which a fluid at rest is the same in all directions

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3
Q

Third principle of pressure

A

Pressure applied to a confined fluid from without is transmitted equally in all directions

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4
Q

Fourth principle of pressure

A

The pressure of a liquid in an open container/vessel is proportional to density of the liquid

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5
Q

Fifth principle of pressure

A

The pressure of a liquid in an open vessel is proportional to its depth

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6
Q

Sixth principle of pressure

A

The pressure of a liquid on the bottom of a vessel is independent of the shape of the vessel

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7
Q

Formula for nozzle reaction for smooth bore nozzle

A

NR=1.57xDxNP

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8
Q

Formula for nozzle reaction for fog nozzle

A

NR=.0505xQxSq root NP

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9
Q

Net Pump Discharge Pressure (NPDP)

A

NPDP=Pump Discharge (PDP)-Intake Reading

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10
Q

The density of a liquid in relation to water

A

Specific Gravity

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11
Q

The speed with which water absorbs heat increases in proportion to what?

A

Waters surface area exposed to heat

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12
Q

What is the quantity of heat absorbed by a substance when it changes from liquid to a vapor?

A

Laten heat of vaporization

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13
Q

Specific heat of a substance is a ratio between what 2 things?

A

1) heat needed to raise temp of a specific quantity of a material
2) heat needed to raise the temp of an identical amount of water the same number of degrees

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14
Q

A measure of the heat absorbing capacity of a substance?

A

Specific Heat

BTU is an amount of heat required to raise temp of 1lbs of water 1*F

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15
Q

What is a Joules?

A

A measure of heat energy

A joule is equal to 1 newton or a distance of 1 meter

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16
Q

What is….
Atmospheric Pressure?
Pressure less than Atmospheric?
Absolute 0 PSI?

A

Atmospheric pressure is 14.7PSI
Pressure less than atmospheric is a VACCUM
Absolute 0 PSI is a PERFECT VACCUM

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17
Q

What is…..
Static Pressure?
Residual Pressure?
Flow Pressure?

A

Static is pressure in system before flow
Residual is pressure left in system during flow
Flow is pressure at discharge during flow

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18
Q

What is….
Altitude?
Elevation?

A

Altitude is position above/below sea level

Elevation is at center line of the pump and loss/gain at nozzle discharge

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19
Q

Elevation equation for multiple storied building and height difference

A

EP= 5 PSI x (number of stories)

EP= (height in feet) /.5

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20
Q

Methods how foam extinguishes fires

A

Separating (creating a barrier)

Cooling (lower temp of fire)

Suppressing (prevents release of flammable vapors)

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21
Q

4 basic methods by which foam is proportioned

A

Induction
Injection
Batch mixing
Premixing

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22
Q

What foam is formulated from hydrocarbon surfactants that reduce the surface tension?

A

Class A

23
Q

What is the mix amount of VACCUM that most pumps can develop?

A

22 inches of mercury ( max theoretical lift of 33.8 feet)

24
Q

What is max lift considered reasonable for most FD pumpers?

A

20 feet Amount of water that can be supplied is only about 60% of rated capacity

25
Q

What are problems that can occur while operating from draft?

A

Air leak on INTAKE side

Whirlpool allowing air to enter pump

Air leak due to defective pump packing

26
Q

What are the Siamese coefficients?
(2) “2 1/2

(3) “2 1/2
(2) . “3 w/ 2 1/2 couplings

A

(2) “2 1/2 = .5
(3) “2 1/2 = .22
(2) . “3 w/ 2 1/2 couplings = .2

27
Q

Percentage method (for hydrant preformance)

A 
       Static 0-10=3x   11-15=2x    16-25=1x(same amount)   25+=no more
28
Q

What types of class B foams are there?

A

Protein Base

Synthetic Base

Combination

29
Q

Formula for friction loss

A

FL=CxQ2xL
——
100

30
Q

“1 Booster Line

A

150

31
Q

“1 3/4 w/ “1 1/2 couplings

A

15.5

32
Q

“2 1/2

A

2

33
Q

“3 w/ “2 1/2 couplings

A

0.8

34
Q

“5

A

0.08

35
Q

Formula for GPM

A

GMP”29.7 x d2 x sq root of Nozzle Pressure

36
Q

3 factors that influence a centrifugal discharge pressure

A

1) amount of water being discharged
2) speed at which impeller is turning
3) pressure of water entering pump from pressurized source

37
Q

Number of BTUs needed to convert 1lbs of water to steam

A

970 BTUs

38
Q

Water expands ________ at _________*F

A

1700 and 212*F

39
Q

Compound pressure gauge

A

Gauge able to measure both negative and positive pressure

40
Q

Foam concentrate

A

Raw foam liquid in its storage container before air and water are introduced

41
Q

Foam proportioner

A

Device that introduces foam concentrate into water stream to make foam solution

42
Q

Foam solution

A

Mixture of foam concentrate and water before air is introduced

43
Q

What is the minimum pump capacity for pumper?(NFPA standard)

A

750 GPM

44
Q

Most common cause of skids in an appuratus

A
  • driving to fast for conditions
  • failing to properly understand weight shifts
  • failing to anticipate obstacles
  • improper use of auxiliary braking devices
  • improper maintenance of tire pressure and tread
45
Q

What is head pressure?

A

Height of a water supply above an oriface
-water pressure to elevation

.434 PSI/ft. H/2.304

46
Q

What is BRAKING DISTANCE?

A

Distance the vehicle travels from the time the brakes are applied until the apparatus comes to a stop

47
Q

What is REACTION DISTANCE?

A

Distance the vehicle travels while a driver is transferring the foot from accelerator to the brake pedal

48
Q

What is TOTAL STOPPING DISTANCE?

A

Sum of drivers reaction distance and the vehicles braking distance

49
Q

Colors used for hydrants and corresponding flows

A

LIGHT BLUE 1500 GPM or greater
GREEN 1000-1499 GPM
ORANGE 500-999 GPM
RED 499 GPM or less

50
Q

What are the percents used to classify low, medium, or high expansion foam?

A

NFPA 11 air/solution ratio

Low= 20:1
Medium= 20:1-200:1
High= 200:1-1000:1
51
Q

What are 3 foam application techniques?

A

Roll on (class B)

Bank down (class B)

Rain down (class B)

52
Q

1 psi will lift 1 sq inch of water_________ high

A

2.304 ft

53
Q

Unity of command

A

States you report to only 1 supervisor

54
Q

What are the 3 tactical priorities?

A
  • life safety (firefighter and rescue)
  • incident stabilization (fire control)
  • property conservation (loss control)
55
Q

What is span of control?

A

That any officer can effectively manage only a certain number of individuals. (3-7 people)

56
Q

What are 4 types of ventilation?

A
  • natural
  • mechanical
  • horizontal
  • vertical (safest way to prevent back draft)

2 ways always combined

Driver Test (2 decks)

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