Chapter 39: Printed Circuit Board Assembly and Repair
MULTIPLE CHOICE
1. The ____ are a tool used by an electronics technician to straighten component leads.
a.
needle nose pliers
c.
round nose pliers
b.
flat nose pliers (duck bill)
d.
diagonal cutters (flush)
2. A(n) ____ provides a means of detecting improper connections or broken traces on the printed circuit
board.
a.
heat sink
c.
logic probe
b.
isolated power supply
d.
illuminated magnifier
3. A(n) ____ is a test equipment used by an electronic technician to measure and/or align amplitude and
frequency and compare waveforms.
a.
signal generator
c.
frequency counter
b.
digital multimeter (DMM)
d.
analog oscilloscope
4. ____ are the first pieces of equipment used to analyze a circuit.
a.
Analog and digital multimeters
c.
Analog oscilloscopes
b.
Isolated power supplies
d.
Frequency counters
5. In most situations a ____ soldering iron is adequate.
a.
15- to 25-watt
c.
30- to 40-watt
b.
25- to 35-watt
d.
35- to 45-watt
6. Typically a small ____ tip is preferred for general printed circuit board work.
a.
conical
c.
pyramid
b.
bevel
d.
chisel
7. ____ connections are the result of withdrawing the soldering iron too soon. The solder does not
become liquid and leaves a connection that is dull gray in appearance.
a.
Rosin
c.
Cold solder
b.
Wicking
d.
Fractured or disturbed
8. A ____ connection is the result of movement of the component leads or wire before the solder sets. It
is evident by a granulated and frosty appearance with many cracks showing.
a.
cold solder
c.
rosin
b.
fractured or disturbed
d.
wicking
9. A ____ connection is caused by the flux and oxidation particles staying between the solder pad and
lead. It is the result of not enough heat.
a.
cold solder
c.
fractured or disturbed
b.
rosin
d.
wicking
10. A shock of approximately 20 to 30 mA causes ____.
a.
a tingling sensation
c.
breathing to be stopped
b.
a painful sensation
d.
electrocution
COMPLETION
1. A(n) ____________________ contains LEDs that produce a visual indication of what is occurring at a
specific point in a digital circuit.
2. ____________________ is the joining of two pieces of metal alloy having a melting point below 800
degrees Fahrenheit.
3. ____________________ helps the solder alloy flow around the connections. It cleans the component
leads of oxide and film, allowing the solder to adhere.
SHORT ANSWER
1. Summarize the proper soldering technique.
ANS:
2. List the guidelines for maintaining a safe work environment.
ANS: