Mobile Water Supply Exam with 100%
Answers
What sizes are the side and rear dump valves normally? - ✅✅ 10 to 12 inches in
diameter and are commonly butterfly valves
When tankers are equipped with large diameter gated intakes, what is required? - ✅✅
Slow operating valves with air bleeders and intake relief valves
What is the heart of the mobile water supply apparatus? - ✅✅ The water tank
What are the two types of water tanks found on mobile water supply apparatus? - ✅✅
1. Elliptical
2. Square-cornered
What are the majority of water tanks today constructed of? - ✅✅ Man-made synthetic
materials such as polyethylene or fiberglass
What is one common item found on tankers not normally found on pumpers? - ✅✅
Folding tank
What is usually required for efficient high flow capacity tanker operations? - ✅✅
Multiple portable tanks
What is a general rule of thumb with portable water tanks? - ✅✅ The portable tank
capacity should be double the size of the apparatus water tank.
What does NFPA 1901 require for hose storage on a mobile water supply apparatus? -
✅✅ A 6 cubic foot minimum hose storage area for 2.5 inch or larger hose and two
areas each w/ 3.5 cubic feet minimum of space for 1.5 inch or larger pre-connected
hose lines.
Traditional Strainer - ✅✅ Must have at least 24 inches of water above this type of
strainer or the water above the strainer will whirlpool
Floating Strainer - ✅✅ May get around the 24 inch minimum depth with this type of
strainer but the filter can only draw water from the bottom
Low-level strainer - ✅✅ Can rest on the bottom of a pool or tank with a minimum of
two inches of water above to prevent whirlpooling
Head pressure - ✅✅ Pressure caused by the height of a water supply above the
discharge point
Answers
What sizes are the side and rear dump valves normally? - ✅✅ 10 to 12 inches in
diameter and are commonly butterfly valves
When tankers are equipped with large diameter gated intakes, what is required? - ✅✅
Slow operating valves with air bleeders and intake relief valves
What is the heart of the mobile water supply apparatus? - ✅✅ The water tank
What are the two types of water tanks found on mobile water supply apparatus? - ✅✅
1. Elliptical
2. Square-cornered
What are the majority of water tanks today constructed of? - ✅✅ Man-made synthetic
materials such as polyethylene or fiberglass
What is one common item found on tankers not normally found on pumpers? - ✅✅
Folding tank
What is usually required for efficient high flow capacity tanker operations? - ✅✅
Multiple portable tanks
What is a general rule of thumb with portable water tanks? - ✅✅ The portable tank
capacity should be double the size of the apparatus water tank.
What does NFPA 1901 require for hose storage on a mobile water supply apparatus? -
✅✅ A 6 cubic foot minimum hose storage area for 2.5 inch or larger hose and two
areas each w/ 3.5 cubic feet minimum of space for 1.5 inch or larger pre-connected
hose lines.
Traditional Strainer - ✅✅ Must have at least 24 inches of water above this type of
strainer or the water above the strainer will whirlpool
Floating Strainer - ✅✅ May get around the 24 inch minimum depth with this type of
strainer but the filter can only draw water from the bottom
Low-level strainer - ✅✅ Can rest on the bottom of a pool or tank with a minimum of
two inches of water above to prevent whirlpooling
Head pressure - ✅✅ Pressure caused by the height of a water supply above the
discharge point
