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MCQs

Total Questions : 399 | Page 1 of 40 pages
Question 1.  The main purpose of interlacing in television scanning is to
  1.    reduce flicker
  2.    brighten the TV picture
  3.    sharpenpicture outline
  4.    increase channel bandwidth
 Discuss Question
Answer: Option A. -> reduce flicker
Question 2.   If a TV picture has 525 lines and scanning rate is 30 pictures/second, time for scanning one line is second.
  1.    30/525
  2.    525/30
  3.    1/30 x 525
  4.    30 x 525
 Discuss Question
Answer: Option C. -> 1/30 x 525
Question 3.   A pulse-type waveform (such as television line pulse) is a modification of
  1.    square wave
  2.    rectangular wave
  3.    sawtooth wave
  4.    sine wave
 Discuss Question
Answer: Option B. -> rectangular wave
Question 4.  The main function of electron gun in a cathode-ray tube is to ---- electrons.
  1.    deflect
  2.    produce
  3.    size
  4.    aspect
 Discuss Question
Answer: Option B. -> produce
Question 5.  In a CRT, focussing of electron beam is achieved by varying
  1.    grid bias
  2.    heater voltage
  3.    voltage of first accelerating anode
  4.    secondary accelerating voltage
 Discuss Question
Answer: Option D. -> secondary accelerating voltage
Question 6.  If there are 625 lines per TV picture, then lines per field are
  1.    1250
  2.    312.5
  3.    625
  4.    2500
 Discuss Question
Answer: Option B. -> 312.5
Question 7.  The function of a sync separator ma TV set is to separate the signals.
  1.    video and sound
  2.    video and line sync
  3.    line sync and field sync
  4.    sound and field sync
 Discuss Question
Answer: Option C. -> line sync and field sync
Question 8.  Intensity of the electron beam in a CRT can be controlled by varying voltage
  1.    grid bias
  2.    cathode
  3.    heater
  4.    accelerating
 Discuss Question
Answer: Option A. -> grid bias
Question 9. . Lissajous patterns obtained by an oscilloscope can be used to get
  1.    phase information
  2.    frequency of input signal
  3.    both frequency and phase information
  4.    voltage amplitude
 Discuss Question
Answer: Option C. -> both frequency and phase information
Question 10.  The observe a portion of a waveform, we must use
  1.    free-running oscilloscope
  2.    triggered-sweep oscilloscope
  3.    vectorscope
  4.    cathode-ray tube
 Discuss Question
Answer: Option B. -> triggered-sweep oscilloscope

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