Deck 5: Pipings, Fittings, and Valves

Question 1

In situations where both piping and electrical wiring are in close proximity, try to keep the piping above the electrical wiring.

Answer 1

False

Question 2

Another specialty valve widely used in hydronic systems provides the ability to isolate, flow balance, and even drain individual heat emitters.It is called a ____.

A) zone valve
B) balancing valve
C) differential pressure bypass valve
D) lockshield valve

Answer 2

D

Question 3

If the inlet pressure on the backflow preventer drops below the pressure in the hydronic system, springs return both check valves and the movable cartridge to their ____ positions.

A) open
B) closed
C) original
D) preset

Answer 3

C

Question 4

Due to thermal expansion, the greater the length of the pipe, and the greater the temperature change, the greater the change in length.

Question 5

In situations where good heat transfer through the walls of the pipe is desirable, ____ is unsurpassed.

A) stainless steel
B) copper
C) cross-linked polyethylene
D) composite tubing

Question 6

A feed water valve is used to increase the pressure of water from a domestic water distribution pipe before it enters a hydronic system.

Question 7

Feed water valves operate by balancing the force generated by water pressure against an internal flexible ____, with the counterforce generate by a partially compressed spring.

A) feeder
B) cavitator
C) diaphragm
D) pressurizer

Question 8

Fittings for copper tubing are available in either wrought copper or ____.

A) stainless steel
B) PEX
C) tempered rubber
D) cast brass

Question 9

The molecular structure of nonmetallic tubes such as those made of PEX or rubber compounds is such that oxygen molecules can diffuse through their tube walls and be absorbed by the fluid within.

Question 10

Copper tubing must be properly supported to prevent sagging or buckling.On horizontal runs of hard temper tubing, the maximum support spacing for 1/2- and 3/4-inch tube is ____ feet.

A) 2
B) 3
C) 4
D) 5

Question 11

In the absence of any building or mechanical codes that require otherwise, type M is the standard for copper tubing used in hydronic heating systems.

Question 12

Piping schematics are the road maps of hydronic system design.Unfortunately, there is no universal standard for piping symbols to which all those in the hydronics industry subscribes.

Question 13

In situations where several runs of piping and/or electrical conduit must be run in close proximity, a ____ system is a good option.

A) mounting rail
B) rubber liner
C) horizontal piping
D) vertical piping

Question 14

Hydronic heating systems, once assembled, must be filled purged of air and filled with fluid.A(n) ____ is specifically designed for this purpose.

A) purging valve
B) air deactivator valve
C) ball valve assembly
D) flow regulator valve

Question 15

Plumbing codes no longer allow solders containing lead to be used for domestic water service.

Question 16

Hydronic heating systems should never use a combination of flexible and rigid piping materials.

Question 17

The pressure difference between the inside and outside of the tube has a very strong effect on oxygen diffusion.

Question 18

A well-planned piping assembly will use the largest number of fittings possible.

Question 19

When long straight runs of rigid tubing are required, it may be necessary to install an expansion loop or an expansion offset to absorb the movement.Another alternative is to install an expansion ____ capable of absorbing the movement.

A) regulator
B) compensator
C) barometer
D) overflow

Question 20

Copper water tube is available in three wall thicknesses designated as types ____ in order of decreasing wall thickness.

A) A, B, and C
B) S, M, and L
C) K, L, and M
D) 1,2, and 3