Chapter 10

Question 1

What is one of the most common ways for a pumper to be supplied with water from a hydrant?

Answer 1

forward hose lay

Question 2

Which hydrant mains are least desirable?

Answer 2

Dead-end mains

Question 3

Why do some fire departments use a four-way hydrant valve?

Answer 3

It allows a second arriving pumper to be connected without interupting the flow, and boost the
pressure in the original supply line.

Question 4

Which method of laying hose starts at the fire scene and ends at the water source?

Answer 4

Reverse Lay

Question 5

Why are newer model pumpers equipped with a check-valve in the tank-to-pump line?

Answer 5

To prevent water from entering the tank under pressure from the pump intake

Question 6

When a pumper is discharging water, what is the intake gauge displaying?

Answer 6

Residual pressure

Question 7

What is the atmospheric pressure at sea level

Answer 7

14.7

Question 8

What is the first consideration in establishing a draft site?

Answer 8

Site Selection

Question 9

What is the most important factor in choosing a draft site?

Answer 9

The amount of water available

Question 10

For a pumper to approach its rated capacity using a traditional strainer, how much water must be over
the strainer?

Answer 10

24 inches

Question 11

All fire pumps meeting NFPA and UL Inc. requirements are rated to pump their capacity of how many
feet of lift?

Answer 11

10

Question 12

While working with 20 feet of lift, the pump operates at what percentage of its capacity?

Answer 12

60 %

Question 13

What is another method that may be used to employ a Venturi effect to achieve water movement during
drafting operations?

Answer 13

jet siphon

Question 14

How long does the typical priming action take?

Answer 14

10-15 seconds