Assessment 2

Question 1

The concept of pumping operations is based on what?

Answer 1

Creating pressure differentials

Question 2

What is the definition of pressure?

Answer 2

The amount of energy in water

Question 3

When using the hard suction, how can you tell you are receiving the maximum amount of water from the hydrant outlet?

Answer 3

Increase in pump speed without an increase in pressure

Question 4

Does pressure have an effect on friction loss?

Answer 4

No

Question 5

What is the characteristic of water that is important for firefighting?

Answer 5

Density

Question 6

What is water differential a difference in?

Answer 6

Quantity

Question 7

What is the type of pressure remaining when a valve is open and the water is flowing?

Answer 7

Residual pressure

Question 8

What is the maximum efficient water capacity of 2.5” hose without excessive friction loss?

Answer 8

250 gpm

Question 9

What is the net pump pressure when drafting?

Answer 9

Discharge pressure + FL in hose + lift psi

Question 10

What is the definition of gear split?

Answer 10

When engine speed reaches the point that the transmission should be shifted

Question 11

In a water relay, where are shutdowns initiated?

Answer 11

At the source of supply

Question 12

Water particles creating friction accounts for what percent of friction loss in the hose?

Answer 12

90 percent

Question 13

What might an air leak cause in a centrifugal pump?

Answer 13

Failure to prime

Question 14

How is net pump pressure calculated?

Answer 14

Intake pressure - discharge pressure

Question 15

Where does cavitation in a centrifugal pump usually occur?

Answer 15

Impeller eye in back of the blade

Question 16

What is the highest pressure the pump panel discharge gauges show?

Answer 16

600 psi

Question 17

In a syphon ejector, where is the velocity of the water converted to pressure greater than the suction pressure?

Answer 17

In the diffuser

Question 18

When using the syphon ejector, feet of head is determined by measuring from the water source to what?

Answer 18

The center of the pump

Question 19

When using the Gleason valve, how do you know you have sufficient pressure on the supply side?

Answer 19

Water will flow from the overflow

Question 20

How far should the radio antenna be held from the eye?

Answer 20

6”

Question 21

Best results during the initial priming operation are achieved with the impeller…

Answer 21

Stationary

Question 22

When shut down for an extended period of time during a drafting operation, what can be done to prevent the water from heating up?

Answer 22

Open a discharge gate bleeder valve

Question 23

In a relay operation, the second pump on scene shall charge his line to what pressure?

Answer 23

Idle

Question 24

What kind of pump packing seals are used by the LAFD?

Answer 24

Mechanical

Question 25

What is the hand signal to shut down the water source?

Answer 25

Hold both hands overhead with finger tips touching

Question 26

When should pressure control devices be set on the pump?

Answer 26

As soon as desired engine pressure is obtained

Question 27

What does the height to which a pump can draft rely on?

Answer 27

Atmospheric pressure

Question 28

When drafting, the rated capacity of the pump will not be obtained when lift exceeds how many feet?

Answer 28

10’

Question 29

What type of threads are on hydrants?

Answer 29

National Standard

Question 30

The F-367 hydrant report, shall be completed and sent to the hydrant access unit within how many days?

Answer 30

14

Question 31

How often is the earthquake packet checked?

Answer 31

Every 4 months