6
1-37. Aboard ship you should be able to
troubleshoot equipment failures to the
component level for which of the
following reasons?
1. Ships must be self-sustaining units
when deployed
2. Storage space on board ships limits
the number of bulky items or
electronic modules that can be stored
3. Individual components may be easier
to obtain than modules or larger
equipment pieces
4. All of the above
1-38. What is the most common cause of
electron tube failures?
1. Vibration damage
2. Open filaments
3. Shorted elements
4. Power supply voltage surges
1-39. The simplest way to test a tube is by
which of the following methods?
1. Using a tube tester
2. Measuring tube element voltages
3. Feeling for signs of overheating
4. Substituting tubes
1-40. Test conditions for the electron tube
tester described in the text are set by
which of the following methods?
1. By a technician setting switches
2. By using a magnetic tape program
3. By using a prepunched card program
4. By inserting the tube into the
appropriate socket
1-41. The electron tube tester can be used to
test common low-power tubes for which
of the following conditions?
1. Gas
2. Quality
3. Leakage
4. Each of the above
1-42. Pushbuttons on the electron tube tester
are used to test for which of the
following conditions?
1. Emission
2. Transconductance
3. Other quality tests
4. Each of the above
1-43. Which of the following tests is
automatically performed when the
electron tube tester card switch is first
actuated?
1. Gas
2. Shorts
3. Opens
4. Quality
1-44. Which of the following methods is
normally used to test high-power
amplifier tubes?
1. Using tube testers
2. Performing interelectrode resistance
checks
3. Making gain measurements with an
oscilloscope
4. Observing built-in meters that
measure grid and plate current and
power output
1-45. Which, if any, of the following problems
occur when klystrons are left in storage
or not used for more than 6 months?
1. They become gassy
2. The elements become tarnished and
ruin the tube
3. All external metallic parts become
tarnished and must be cleaned prior
to use
4. None
