22Figure 3A.—Square wave. IN ANSWERING QUESTIONS 3-6 THROUGH 3-10, SELECT THE CORRESPONDING LETTER IN FIGURE 3A WHICH DESCRIBES THE PORTION OF THE WAVEFORM IN EACH OF THE FOLLOWING QUESTIONS. 3-6. The leading edge of the pulse. 1. C 2. D 3. E 4. F 3-7. The trailing edge of the pulse. 1. A 2. B 3. C 4. D 3-8. The positive alternation. 1. C 2. D 3. E 4. F 3-9. The amplitude of the pulse. 1. A 2. B 3. C 4. D 3-10. The pulse-repetition time of the pulse. 1. C 2. D 3. E 4. F 3-11. What type of waveform is used to furnish a linear rise in current for electromagnetic cathode ray tubes? 1. Square wave 2. Sawtooth wave3. Trapezoidal wave4. Rectangular wave 3-12. Which of the following multivibrators must have a signal applied (triggered) to change states? 1. Astable 2. Bistable 3. Monostable 4. Both 2 and 3 above 3-13. Which of the following multivibrators is also called a free running multivibrator? 1. Astable 2. Bistable 3. Monostable 4. Both 2 and 3 above 3-14. Which of the following waveforms could be the output of the astable multivibrator? 1. Sine wave 2. Sawtooth wave3. Rectangular wave 4. Trapezoidal wave
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