3 A single signal trace can be displayed on an oscilloscopes

3. A single signal trace can be displayed on an oscilloscope\'s screen by setting the trigger control to A. AUTO. B. SGL SWP. C. HF REJ. D. NORM.

4. Why should you use caution when measuring high-voltage inductive devices with an oscilloscope? A. The device can produce a very high voltage spike when it de-energizes. B. The device may not be grounded. C. If the device shorts, a large current spike could destroy the probe. D. High-voltage inductive devices produce electrical noise that can be displayed instead of the actual waveform.

5. An AC voltage that\'s present on a DC power supply\'s output is called A. flicker. B. ripple. C. distortion. D. oscillation.

6. One cycle of a sine wave contains five divisions. If the time base is set to one millisecond per division, how long will it take this sine wave to complete one cycle? A. 0.05 millisecond B. 50 milliseconds C. 0.5 millisecond D. 5 milliseconds

7. Your oscilloscope\'s test probe is placed in the 10X or 10:1 position. You measure a waveform as being 4 VAC peak-to-peak. What is the actual voltage at this test point? A. 0.04 VAC B. 0.4 VAC C. 40 VAC D. 4 VAC

8. You\'re about to make a measurement with an oscilloscope when you find that the trace appears to be very weak on the screen. Which of the following controls would you adjust to make the trace appear brighter? A. The focus control B. The level control C. The intensity control D. The slope control

9. A waveform that\'s displayed on the screen of an oscilloscope is called a A. trace. B. scan C. signal. D. line.

10. The connector that\'s used to attach a probe to an input terminal of a scope is called a(n) A. F-type connector. B. BNC connector. C. T-type connector. D. Phono style connector.

11. In an oscilloscope\'s CRT, the component that heats the cathode and causes it to emit electrons is the A. accelerating electrode. B. filament. C. control grid. D. electron gun.

12. On an oscilloscope, the volts per division setting for channel A is set to 5.0 volts per division. You\'re using a direct probe, and an AC signal covers five graticule divisions. What is the peak-to-peak voltage of this signal? A. 22.5 V B. 7.5 V C. 12.5 V D. 25.0 V

13. The horizontal sweep frequency signal that\'s used to move the electron beams across an oscilloscope screen is a type of A. sine wave. B. square wave. C. triangular wave. D. sawtooth wave.

14. On an oscilloscope\'s graticule, the center horizontal line (the x-axis) represents units of A. voltage. B. time. C. phase. D. night.

15. The amount of phase shift between input and output signals is important when measuring A. servo circuits. B. transistor circuits. C. SCR circuits. D. TRIAC circuits.

16. You wish to measure the AC value of a composite signal made up of both AC and DC voltages. The coupling switch should be set to A. EXT. B. AC. C. DC. D. GND.

17. A waveform takes 0.0002 second (0.2 millisecond) to complete one cycle. What is the frequency of this signal? A. 2 hertz B. 200 hertz C. 50 kilohertz D. 5 kilohertz

18. To increase the vertical size of a 2 V square waveform that appears only one-half division high on your scope screen, you should adjust the A. coupling switch to ADD. B. volts per division control. C. time base control. D. vertical position control.

19. A good ground reference for a power supply circuit is the A. screws that hold the transformer together. B. transformer\'s center tap. C. negative terminal of the filter capacitor. D. positive terminal of the diode rectifier.

20. What is the maximum AC input voltage (peak-to-peak) that most oscilloscopes can safely measure? A. 600V–800V B. 1,600 V–1,800 V C. 1,000 V–1,400 V D. 800 V–1,000 V

21. A portable, battery-powered oscilloscope is very lightweight and can operate for many hours before its batteries need to be recharged. Which of the following screens would this oscilloscope contain? A. An LCD screen B. An LED screen C. A CRT screen D. A plasma screen

22. If you viewed a digital clock frequency signal on an oscilloscope, what type of waveform would you see on the scope screen? A. A triangular wave B. A square wave C. A sine wave D. A sawtooth wave

23. A DIP clip is usually used to measure A. high voltages. B. SCR circuits. C. relays and solenoids. D. integrated circuits.

24. Which one of the following triggering controls is used to select the positive-going or negative-going edge of a signal for trace triggering? A. The level control B. The field control C. The slope control D. The line control

25. Inside an oscilloscope\'s CRT, an electron beam is used to create a moving dot of light on the screen. The electron beam is moved across the screen when A. a horizontal and vertical yoke are energized and deenergized. B. magnets are moved across the neck of the yoke. C. the internal focus grids are grounded or charged. D. a positive or negative charge is applied to internal deflection plates.

Solution

5. An AC voltage that\'s present on a DC power supply\'s output is called ripple.

therefore the correct option is (B).

6. One cycle of a sine wave contains five divisions. If the time base is set to one millisecond per division, how long will it take this sine wave to complete one cycle?

one cycle= number of divisions * millisecond per division

one cycle = 5*1 millisecond

= 5 milliseconds.

therefore the correct option is (D).

11. In an oscilloscope\'s CRT, the component that heats the cathode and causes it to emit electrons is the electron gun.

therefore the correct option is (D).