Sampling Oscilloscope MCQ || Sampling Oscilloscope Questions and Answers

1. The sampling technique in sampling oscilloscope _____ the signal frequency.

  1. Increase
  2. Slow Down
  3. Increase or Decrease
  4. None of the above

Answer.2. Slow Down

Explanation: 

High-frequency signals cannot be viewed by conventional oscilloscopes because their frequency range is limited by the gain-bandwidth product of its vertical amplifier. The sampling technique slows down the signal frequency many thousands of times thereby making it easier

 

2. The sampling oscilloscopes are used for analyzing _____

  1. High-frequency Signal
  2. Low-frequency signal
  3. High Power signal
  4. Low Power Signal

Answer.1. High-frequency Signal

Explanation: 

  • The sampling oscilloscopes are used for analyzing very high-frequency signals.
  • They are used for looking at repetitive signals which are higher than the sample rate of the oscilloscope.
  • They capture the samples by assembling samples from several successive waveforms, and by combing them during the processing, they are able to build up a picture of the waveform.
  • The oscilloscope specifications for these items may detail a frequency capability or bandwidth sometimes as high as 50 GHz.

 

3. The measuring range of high frequency in sampling oscilloscope is in order of ______

  1. 10 GHz
  2. 10 MHz
  3. 30 MHz
  4. 50 MHz

Answer.4. 50 MHz

Explanation: 

  • The sampling oscilloscopes are used for analyzing very high-frequency signals.
  • They are used for looking at repetitive signals which are higher than the sample rate of the oscilloscope.
  • The oscilloscope specifications for these items may detail a frequency capability or bandwidth sometimes as high as 50 GHz. 

 

4. In Sampling CRO for recurrent signals having frequencies higher than the ultrawide band scopes _____ technique is used.

  1. Frequency technique
  2. Multiplexing technique
  3. Sampling technique
  4. Demultiplexing technique

Answer.3. Sampling technique

Explanation: 

  • In sampling C.R.Os different technique is used to improve the high-frequency response.
  • For recurrent signals having frequencies higher than the ultrawideband scopes, the sampling technique can be used to display them.
  • In this technique, the sequential samples of the input waveforms are taken and then the input waveform is reconstructed from these samples. The problem of bandwidth limitations that occur in conventional C.R.T. is thus avoided.

 

5. The _______ is used in Sampling CRO to turn the sampling circuit for a very short time interval.

  1. Gate Pulse
  2. Sampling Pulse
  3. Trigger Pulse
  4. Any of the above

Answer.2. Sampling Pulse

Explanation: 

The sampling pulse is used to turn the sampling circuit for a very short time interval and the 3 voltage of the waveform at that instant is measured.

 

6. In sampling CRO the spot of the electron beam is positioned ____

  1. Vertically
  2. Horizontally
  3. Both vertically and Horizontally
  4. None of the above

Answer.3. Both vertically and Horizontally

Explanation: 

The spot of the electron beam is positioned vertically on the C.R.T. screen to the corresponding voltage input.

During a subsequent cycle of the input voltage waveform, the next sample is taken and the C.R.T. spot is moved horizontally for a very short distance and then repositioned vertically to the new value of the sample corresponding to the input voltage.

Continuing in this way the entire waveform is plotted point by point by taking a large number of samples (about 100 samples) to reconstruct the original input waveform.

 

7. In sampling oscilloscope as many as one thousand samples are taken to reconstruct ______.

  1. One Cycle
  2. Two-Cycle
  3. Ten Cycle
  4. Thousand Cycle

Answer.4. Thousand Cycle

Explanation: 

In the sampling oscilloscope, as many as one thousand samples are taken to reconstruct one cycle.

The sampling frequency may be as low as 1/100th of the input signal frequency i.e. ordinary oscilloscope having a bandwidth of 10 MHz can be used for observing an input signal of frequency as high as 1,000 MHz as many as 1,000 samples are used to reconstruct the original waveform.

 

8.  In sampling CRO at the beginning of each sampling cycle, the _____  activates an oscillator.

  1. Sampling Pulse
  2. Trigger Pulse
  3. Gate Pulse
  4. None of the above

Answer.2. Trigger Pulse

Explanation: 

  • At the beginning of each sampling cycle, the trigger pulse activates an oscillator and a linear ramp voltage is generated.
  • This ramp voltage is applied to a voltage comparator. This comparator compares the ramp voltage to the staircase generator output voltage.
  • When the two voltages are equal in amplitude, the staircase generator is allowed to advance one step and simultaneously a  sampling pulse is applied to the sampling gate.
  • At this moment, a sample of the input voltage is taken, amplified, and applied to the vertical deflecting plates.

 

9. In sampling CRO the comparator compares the ____

  1. Input voltage and Ramp Voltage
  2. Input voltage and Output voltage
  3. Ramp voltage and output voltage
  4. Ramp Voltage and Input current

Answer.3. Ramp voltage and output voltage

Explanation: 

  • At the beginning of each sampling cycle, the trigger pulse activates an oscillator and a linear ramp voltage is generated.
  • This ramp voltage is applied to a voltage comparator. This comparator compares the ramp voltage to the staircase generator output voltage.
  • When the two voltages are equal in amplitude, the staircase generator is allowed to advance one step and simultaneously a  sampling pulse is applied to the sampling gate.
  • At this moment, a sample of the input voltage is taken, amplified, and applied to the vertical deflecting plates.

 

10. The resolution of the final image on the screen of the sampling oscillator is determined by

  1. Staircase Generator
  2. Attenuator
  3. Ramp Generator
  4. Sampling Gate

Answer.1. Staircase Generator

Explanation: 

The resolution of the final image on the screen of the CRT is determined by the size of the steps of the staircase generator. The smaller the size of these steps and the larger the number of samples, the higher will be the resolution of the image.

Therefore for larger step size. the horizontal spacing between the C.R.T. spots is greater for the reconstruction of the input waveform.

 

11. The main advantage of sampling oscilloscopes are

  1. Clear waveform
  2. High electrical signal generated
  3. Analyze high-frequency signal
  4. All of the above

Answer.4. All of the above

Explanation: 

Advantages of sampling oscilloscopes are

  1. The waveform display is clear.
  2. High-speed electrical signals can be produced.
  3. Very high-frequency performance can be achieved.
  4. The sampling techniques allow the design of the oscilloscope with a wide bandwidth frequency.
  5. The sampling oscilloscopes are used for analyzing very high-frequency signals.

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