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Electronics Engineering Objective Questions { Television Engineering }

8. Intensity of the electron beam in a CRT can be controlled by varying voltage
A. grid bias
B. cathode
C. heater
D. accelerating
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9. The observe a portion of a waveform, we must use
A. free-running oscilloscope
B. triggered-sweep oscilloscope
C. vectorscope
D. cathode-ray tube
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10. Lissajous patterns obtained by an oscilloscope can be used to get
A. phase information
B. frequency of input signal
C. both frequency and phase information
D. voltage amplitude
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11. The term wide-band as applied to an oscilloscope denotes the bandwidth of its
A. vertical amplifier
B. horizontal amplifier
C. both vertical and horizontal amplifiers
D. none of the above
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12. When a complete oscilloscope is used as a vectorscope, with the input signals coupled directly to CRT deflection plates, the deflection plates must be effectively isolated from
A. vertical amplifier only
B. horizontal amplifier only
C. both vertical and horizontal amplifiers
D. accelerating anodes
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13.  An oscilloscope is generally used to measure the value of .......... voltage
A. dc
B. rms ac
C. peak-to-peak ac
D. average value of ac
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14. The purpose of a synch oscilloscope is to
A. set the intensity level
B. control brightness
C. set the focus
D. lock the signal
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