1.  A pulse-type waveform (such as television line pulse) is a modification of
A. square wave
B. rectangular wave
C. sawtooth wave
D. sine wave

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2. The main purpose of interlacing in television scanning is to
A. reduce flicker
B. brighten the TV picture
C. sharpenpicture outline
D. increase channel bandwidth

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3.  If a TV picture has 525 lines and scanning rate is 30 pictures/second, time for scanning one line is second.
A. 30/525
B. 525/30
C. 1/30 x 525
D. 30 x 525

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4. If there are 625 lines per TV picture, then lines per field are
A.1250
B.312.5
C.625
D.2500

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5. The function of a sync separator ma TV set is to separate the signals.
A. video and sound
B. video and line sync
C. line sync and field sync
D. sound and field sync

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6. The main function of electron gun in a cathode-ray tube is to ---- electrons.
A. deflect
B. produce
C. size
D. aspect

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7. In a CRT, focussing of electron beam is achieved by varying
A. grid bias
B. heater voltage
C. voltage of first accelerating anode
D. secondary accelerating voltage

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