Unit 7

The size indicated for the diameter of copper tubing used for plumbing is the ___.

• inside diameter

• outside diameter

• wall thickness

• None of the above.

The size indicated for the diameter of ACR copper tubing is the ___.

• inside diameter

• outside diameter

• wall thickness

• None of the above.

The maximum temperature at which soft soldering is done is ___.

• 212°F

• 400°F

• 600°F

• 842°F

Brazing is done at ___ soldering.

• the same temperature as

• lower temperatures than

• higher temperatures than

• temperatures that can be higher or lower than

When soldering or brazing, the solder is ____.

• heated directly by the flame of the heat source

• heated by the surrounding air

• used to oxidize the metal

• melted by heat from the tubing and fitting

Filler materials used in the high-temperature connection of copper joints are composed of ____.

• 50/50 tin-lead

• 95/5 tin-antimony

• 15%-60% silver

• bronze

Molten solder flows between the two base metals being soldered because ____.

• the atmospheric pressure pushes it in

• of capillary attraction

• there are no surface pores in the base metal

• the tubing surface melts and the pressure differential forces it in

The proper type of flame from an oxyacetylene torch for silver brazing is ____.

• long tail flame

• neutral flame

• oxidizing flame

• carbonizing flame

When soldering, flux should be applied to ____.

• the male part of the joint only

• the female part of the joint only

• both the male and female parts of the joint

• around the mated parts

Pipe threads are standardized by the A.N.S. A.N.S. stands for ____.

• All Nominal Standard

• American National Standard

• All New Steel

• Apparent Nominal Standard