28 3-35.   The medium 1 range on the Tracker 2000 is designed to test resistance values between what (a) minimum and (b) maximum values? 1.   (a)     5 ohms (b)     1 kilohm 2.   (a)   50 ohms (b)   10 kilohms 3.   (a) 500 ohms (b) 100 kilohms 4.   (a)   50 kilohms (b)   10 megohms 3-36.   What is the principal use of the oscilloscope? 1.   To measure microwave energy 2.   To visually examine waveforms 3.   To measure in-line power supply currents 4.   To locate sources of radio interference 3-37.   Cathode-ray tubes used in oscilloscopes contain which of the following components? 1.   An electron gun 2.   A deflection system 3.   A fluorescent screen 4.   All of the above 3-38.   In a basic oscilloscope, what is the purpose of the deflection system? 1.   To filter harmonic frequencies 2.   To deflect harmonic frequencies 3.   To position the beam on the screen 4.   To deflect synchronous side effects 3-39.   If the electron beam is left in one position on the CRT for long periods, damage is likely to occur to what component(s)? 1.   Illuminating coating 2.   Deflection plates 3.   Signal generator 4.   Electron gun 3-40.   Of the following factors, which one(s) control(s) the angle of deflection of the electron beam in the CRT? 1.   Difference of potential between plates 2.   Length of deflection field 3.   Beam acceleration 4.   All of the above 3-41.   In an oscilloscope, which of the following waveform characteristics are represented by (a) vertical deflection and (b) horizontal deflection? 1.   (a) Amplitude (b) frequency 2.   (a) Power (b) amplitude 3.   (a) Power (b) frequency 4.   (a) Time (b) amplitude 3-42.   In oscilloscopes using electrostatic CRTs, what type of signal is used to produce horizontal beam movement? 1.   Dc 2.   Sine wave 3.   Square wave 4.   Sawtooth wave 3-43.   The length of time the phosphor coating on the CRT remains bright after the electron beam is removed depends on which of the following characteristics? 1.   Persistence of the coating 2.   Amplitude of the applied signal 3.   Frequency of the applied signal 4.   Synchronization frequency of the oscilloscope 3-44.   An oscilloscope that can display two vertical input signals at the same time is said to be what type? 1.   Two-function 2.   Dual-trace 3.   Single-function 4.   Single-trace