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an acceptable tinned wire has
an insulation clearance equal to the diameter of the wire and wire strands covered with solder, but still visible
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during soldering, apply the proper amount of solder directly to the
connection
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how should you remove excess solder from the soldering iron tip?
wipe the iron on a damp sponge or rag
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what angle is used to trim out damaged foil areas of printed circuit doards?
45 degrees
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to connect wires or components leads to flat perforated terminals, the wrap must be
180 degrees
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how should you test the heat of a soldering iron?
touch the tip to solder, away from your body
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when sololdering a brass fiting to copper tubing, how far should the inner cone of the torch flame be kept from the work?
at least one half of an inch
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hwo should you remove a component from a printed circuit board?
vacuum desoldering
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to clean tinned, lead plated circuit boards use
a medium bristle brush and alcohol
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when repairing a damage terminal on a circuit board, the replacement foil should overlap the connecting circuit by at least
0.125 inch
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oxide film is removed from the surface of metals during the soldering process by
the soldering flux
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you should clean the circuit board connection within how long after it has cooled?
90 minutes
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which choice best describes a good solder connection
no pits or holes and has a good concave fillet
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when making wire connection to turret terminals, wrap the wire around the terminal at least
180 degrees
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you can best determine a soldered connections quality by
giving it a thourough visual inspection
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what must you do before soldering gold plated integrated circuit leads
remove their gold plating
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why do we use thermal shunts in soldering
they protect heat sensitive components
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when soldering a module type package to a printed ciruit board, ensure the connection is soldered within
5 seconds
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how should you hold a printed circuit board to desolder a component
verticalls
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you must repai a circuit board conductor if it has a nick that extends what part of its width?
25 percent
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how should you shape a soldering irons copper tip?
use a fine file when the tip is cold
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prior tgo soldering electronic equipment, ensure the equipment is
disconnected from the power source
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how should a clinched lead terminal lay in respect to the printed circuit pad
flat on the pad and in the direction of the printed circuit wiring pattern
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how should you clean a plated soldering tip?
with an abrassive cloth while the tip is cold
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which type of solder is preferred for printed circuit boards?
63/37
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you should clean the metal you are soldering to
let the solder adhere properly
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what is an acceptable substitute for siler solder flux?
borax an water
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what is the heaviest duty solering iron you normally use in soldering a printed circuit board?
27 watts
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