4-34. What type of pipe is corrosion-
resistant, does not rust or rot, and can
be cut with a carpenters saw?
1. Cast-iron soil
3. Vitrified clay
4. Galvanized steel
4-35. The specially designed coupling that
connects lengths of cement-asbestos
pipe has how many sealing rings?
4-36. When laying ductile iron pipe, you
should ensure that both the bell and
plain ends are in what condition?
4-37. Because of the high-impact strength of
ductile iron, rocks and boulders in
excess of what diameter must be
removed from the backfill?
3. 10 inches
4-38. What is the most common joint used
to connect two lengths of concrete
4. Slip joint
4-39. Flexibility in operating a water supply
is provided by the proper selection of
4. joining techniques
4-40. When installing a water system where
frequent valves settings are required
for flow regulation, you should use
what type of valve?
4. Pressure reducing
4-41. To close a butterfly valve, you must
turn the handle one-quarter turn to
rotate the disk what distance?
4-42. What is the primary purpose of a
1. To reduce the amount of liquid
going through a line
2. To control the direction of flow
through a line
3. To check the amount of residue
going through a drain line
4. To drain condensate from steam,
drain, and exhaust lines