11
2-15. If you do not have a suitable tip for
desoldering, how can one be improvised?
1. File an available tip down to the
desired size
2. Bend a piece of wire to the desired
shape and insert the ends of the wire
into the barrel
3. Bend a piece of copper wire to the
desired shape after wrapping it
around a regular tip
4. File a piece of round stock,
preferably steel, to the desired shape
and insert it in the barrel
2-16. What are the two metals most often used
to form soft solder?
1. Lead and antimony
2. Tin and lead
3. Bismuth and tin
4. Tin and cadmium
2-17. What chemical or physical change causes
a joint of soldered copper conductors to
become one common metal?
1. A physical change takes place as the
solder flows between the molecules
of copper joining them together
when cooled
2. A physical change takes place as
both metals displace one another
3. A chemical change takes place as
the copper is dissolved into the
solder thereby forming an alloyed
metal
4. A chemical change takes place
when the additional materials added
to the solder are heated causing a
gluing effect between the solder and
the copper
2-18. When you solder electrical connectors,
splices, and terminal lugs, what type of
solder should you use?
1. 65/35 solder
2. 63/37 solder
3. 60/40 solder
4. 57/43 solder
2-19. Why is flux used in the soldering
process?
1. It dilutes the molten solder and
allows it to flow
2. It acts as a cleaning agent to remove
oxide
3. It acts as the bonding agent between
the solder and metal
4. It forms a conductive bond between
the metal and the solder
2-20. When electrical and electronic
components are soldered, what type of
flux must be used?
1. Hydrochloric acid
2. Sal ammoniac
3. Zinc chloride
4. Rosin
2-21. What two properties must a solvent
have?
1. Noncorrosive-nonconductive
2. Corrosive-conductive
3. Noncorrosive-conductive
4. Corrosive-nonconductive
2-22. Why are solvents used in the soldering
process?
1. To remove the flux from the metal
surface being soldered
2. To remove contaminants from the
soldered connection
3. To dilute the flux and allow it to
flow freely
4. To improve the conductivity of the
flux
