27 3-24.   Typical rf signal generators use which of the following methods for modulation? 1.   Internal modulation 2.   External modulation 3.   Both 1 and 2 above 4.   Power supply modulation 3-25.   The modulating circuit in an rf signal generator serves which of the following purposes? 1.   It produces an fm signal that can be superimposed on the rf signal 2.   It produces a video signal that can be superimposed on the rf signal 3.   It produces an audio signal that can be superimposed on the rf signal 4.   Both 2 and 3 above 3-26.   The output level meter of a signal generator reads 0. 10 with the attenuator set to 080. 0.  What is the actual output in microvolts? 1. 00.08 2. 00.80 3. 08.00 4. 80.00 3-27.   Frequency counters serve which of the following purposes? 1.   Measure voltage in a circuit 2.   Measure frequencies in a circuit 3.   Produce voltages to test a circuit 4.   Produce frequencies to power a circuit 3-28.   In which of the following ways is a logic probe useful to a technician? 1.   It detects steady logic levels 2.   It detects a train of logic levels 3.   Both 1 and 2 above 4.   It displays the shape of high-speed transients 3-29.   In logic probes, which of the following devices is used as an indicator? 1.   A dial 2.   An LED 3.   A scale 4.   A pointer 3-30.   The Tracker 2000 is used to isolate defective components on de-energized circuits only. 1.   True 2.   False 3-31.   The VERT control adjustment controls what position of the signal on the CRT display? 1.   Horizontal 2.   Vertical 3.   Trace rotation left 4.   Trace rotation right 3-32.   The axes of the CRT display on the Tracker 2000 are divided into what number of quadrants? 1. 1 2. 2 3. 3 4. 4 3-33.   Quadrant 2 on the Tracker 2000 CRT is used to display what signal information? 1.   Positive voltage negative current 2.   Positive voltage and positive current 3.   Negative voltage and negative current 4.   Negative voltage and positive current 3-34.   When you are adjusting the level control on the Tracker 2000, the peak of each pulse will be from 0 volts to what maximum voltage level? 1. 1 2. 5 3. 3 4. 9