1 A signal thats made up of both AC and DC components is cal

1. A signal that\'s made up of both AC and DC components is called a A. phased signal. B. composite signal. C. continuous signal. D. dual signal.

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

3. Which of the following scope probe connections should be used to make a measurement from an integrated circuit lead? A. A point-type probe contact B. A needle-tip probe C. A direct probe connection D. An extender on the probe

4. You need to use an oscilloscope to measure an industrial control system that doesn\'t contain a ground reference. Which of the following actions should you take? A. Isolate the oscilloscope from ground by using an Isolation Transformer. B. Connect the ground lead of the probe to the chassis and perform your measurements. C. Hook the ground lead to the negative terminal of the power supply before performing measurements. D. Don\'t use the ground lead on the probe; simply make measurements using the hook tip.

5. 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. 5 milliseconds B. 0.5 millisecond C. 50 milliseconds D. 0.05 millisecond

6. You need to adjust the vertical size of a sine wave on your oscilloscope screen. Which of the following front panel controls would you use to make the adjustment? A. The coupling switch B. The volts per division control C. The time base control D. The vertical position control

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

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

9. What is the frequency of an AC signal that takes 50 s to complete one cycle? A. 12 kHz B. 200 Hz C. 20 kHz D. 2 kHz

10. 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. A CRT screen B. A plasma screen C. An LCD screen D. An LED screen

11. What is the peak-to-peak voltage of the AC waveform shown below if the volts per division control is set at 2 V per division? A. 10 V peak-to-peak B. 8 V peak-to-peak C. 12 V peak-to-peak D. 6 V peak-to-peak

12. 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. GND. B. EXT. C. AC. D. DC.

13. 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. time base control. B. vertical position control. C. coupling switch to ADD. D. volts per division control.

14. A sine wave signal takes 0.01 second to complete one cycle. What is the frequency of this signal? A. 60 Hz B. 100 Hz C. 120 Hz D. 80 Hz 15. A DIP clip is usually used to measure A. high voltages. B. relays and solenoids. C. integrated circuits. D. SCR circuits.

16. 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. 4 VAC B. 40 VAC C. 0.4 VAC D. 0.04 VAC

17. On an oscilloscope\'s graticule, the center vertical line (the y-axis) represents units of A. time. B. current. C. voltage. D. frequency.

18. 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 line control B. The slope control C. The field control D. The level control 19. In an amplifier circuit that contains a transistor in a common-emitter configuration, the phase shift between the input signal and the output signal will usually be A. 90 degrees. B. 60 degrees. C. 180 degrees. D. 30 degrees.

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

21. 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. 12.5 V B. 7.5 V C. 22.5 V D. 25.0 V

22. 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. the internal focus grids are grounded or charged. B. a horizontal and vertical yoke are energized and deenergized. C. a positive or negative charge is applied to internal deflection plates. D. magnets are moved across the neck of the yoke. 23. The source switch in the triggering section of an oscilloscope is set to the LF REJ position. This means that A. the trigger is locked to a television field. B. all low-frequency components of the signal waveform will be filtered out. C. any signal that measures over 0.1 VDC will trigger the sweep. D. only the low-frequency components of the signal wil be used for triggering. End of exam 24. If you\'re preparing to make a measurement with a scope and you notice that the trace appears blurry and distorted, which of the following controls should you adjust? A. The focus adjustment B. The coupling switch C. The level adjustment D. The slope control

25. The output signal from a frequency inverter will appear on a scope screen as a A. triangular-shaped waveform with distorted peaks. B. pure sine wave of different frequencies. C. distorted sine wave. D. distorted square wave.

Solution

(1) B

(2) D

(3)B

(4)C

(5)A

(6)B

(7)C

(8)C

(9)C

(10)C

(11) DIAGRAM NOT GIVEN (IF THERE ARE 6 DIVISIONS THEN IT IS 6*2=12V)

(12)C

(13)D

(14)B

(15)B

(16)C

(17)C

(18)B

(19)C

(20)D

(21)D

(22)C

(23)B

(24)A

(25)B