CH9

Question 1

NFPA 1900 only requires that the tank needs to supply the rated capacity for ___% of its volume.

Answer 1

80
pg 320

Question 2

Cavitation, or “suction cavitation”, results from a situation known as ______ that creates a low-pressure condition on the intake side of the pump.

Answer 2

overpumping
pg 320

Question 3

Since a primer removes air from the pump, operating the primer will clear the

Answer 3

airlock
pg 321

Question 4

NFPA 1900, the use of check valve in the tank-to-pump line is the most common way to prevent water from ______ at an excessive rate into the tank.

Answer 4

backflowing
pg 325

Question 5

A common practice involves placing them (hydrants) every ___ft in residential areas and every ___ft in high value commercial and industrial areas.

Answer 5

500; 300
pg 326

Question 6

In general, fire hydrant bonnets, barrels, and foot pieces are made of

Answer 6

cast iron
pg 327

Question 7

Internal working parts are usually made of bronze while valve fittings may consist of ______, _______, or __________.

Answer 7

rubber, leather, composite materials
pg 327

Question 8

Hydrant specifications require a ___inch valve opening for 3-way hydrants and ___inch connection to the water main.

Answer 8

5; 6
PG 328

Question 9

One of the most common ways for a pumper to draw water from a hydrant is with a

Answer 9

forward hose lay
pg 333