7
1-46. Which of the following actions should
you take to restore operation if the
klystron is gassy?
1. Replace the klystron with a new one
2. Return it to the nearest depot for
intermediate maintenance
3. Evacuate the gas by igniting the
tube’s getter
4. Operate it at reduced beam voltage
for approximately 8 hours
1-47. Traveling-wave tubes (twt) should be
replaced if they deviate from design
specifications by what minimum
percentage?
1. 1%
2.
10%
3.
25%
4.
33%
1-48. If a twt used as an oscillator fails, which
of the following indications should you
observe?
1. The twt will become noisy
2. Equipment line fuses will blow
3. The twt will have reduced output
power
4. The twt will fail to break into
oscillation when all other conditions
are normal
1-49. Which of the following is an appropriate
reason to use transistors instead of
electron tubes?
1. Transistors are more rugged than
electron tubes
2. Transistors are not as heat sensitive
as electron tubes
3. Transistors are not as sensitive as
electron tubes to voltage overloads
4. Transistors are capable of handling
greater amounts of power than
electron tubes
1-50. When using an ohmmeter to test a
transistor’s base-to-emitter or base-to-
collector junction, what minimum back-
to-forward resistance ratio should you
expect to read?
1. 5 to 1
2. 10 to 1
3. 50 to 1
4. 100 to 1
1-51. When taking forward and reverse
resistance readings between a transistor’s
emitter and collector, what type of
reading should you get?
1. Both the forward and reverse
readings should be nearly the same
2. A short in both the forward and
reverse directions
3. Less than 15 ohms when measuring
in the forward direction and infinite
in the reverse direction
4. Less than 15 ohms in the reverse
direction and infinite in the forward
direction
1-52. When using an ohmmeter to test
transistors, you should avoid using R1
range for which of the following
reasons?
1. The R1 range is not as accurate as
the other ranges
2. Most ohmmeters do not produce
sufficient voltage on the R1 range
to properly bias a transistor junction
3. Some ohmmeters produce in excess
of 100 milliamps of current on the
R1 range and could possibly
damage the transistor
4. The R1 scale is not capable of
measuring the high resistances that
are typical of a PN junction when
forward biased
