8
Figure 1E.—Thermistor bridge.
IN ANSWERING QUESTION 1-50, REFER
TO FIGURE 1E.
1-50. In the thermistor bridge, what is the
purpose of RT-1 and RT-3?
1. To compensate for power used by
RT-2
2. To compensate for temperature
changes outside the waveguide
3. To control the amount of rf energy
applied to RT-2
4. To control the temperature of the
waveguide
1-51. To measure shaft rotation rate on an
engine, you should use, which, if any, of
the following instruments?
1. An ammeter
2. A bolometer
3. A tachometer
4. None of the above
1-52. In the centrifugal tachometer, what
component restricts the action on the
lower collar that is produced by
centrifugal force?
1. The spring
2. The pointer
3. The upper collar
4. The lower collar
1-53. What is the usual speed range (in feet per
minute) of a chronometric tachometer?
1. 0 to 30
2. 0 to 300
3. 0 to 3,000
4. 0 to 30,000
