61. The applications of digital storage oscilloscopes are
Audio-video recording
Radio Broadcasting
Used in AC and DC
All of the above
Answer.4. All of the above
Explanation:
The applications of digital storage oscilloscopes are as follows:
It is used in audio and video recording.
It is used in radio broadcasting for signal testing.
In circuit debugging, it is used for testing the voltage of the signal.
The measurement of various AC parameters such as current, voltages, etc.
It is used to measure slow-moving parameters such as the temperature of the day.
It can be used to measure A.C. as well as D.C. voltages and currents, Frequency, time period, time interval between two signals, etc.
It tis used to give the visual representation for a target of radar such as airplane, ship etc.
In medical fields, it is used to display cardiograms that are useful for the diagnosis of the heart of the patient.
62. The sampling technique in sampling oscilloscope _____ the signal frequency.
Increase
Slow Down
Increase or Decrease
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
63. The sampling oscilloscopes are used for analyzing _____
High-frequency Signal
Low-frequency signal
High Power signal
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.
64. The measuring range of high frequency in sampling oscilloscope is in order of ______
10 GHz
10 MHz
30 MHz
50 MHz
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.
The oscilloscope specifications for these items may detail a frequency capability or bandwidth sometimes as high as 50 GHz.
65. In Sampling CRO for recurrent signals having frequencies higher than the ultrawide band scopes _____ technique is used.
Frequency technique
Multiplexing technique
Sampling technique
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 ultrawide band 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.
66. The _______ is used in Sampling CRO to turn the sampling circuit for a very short time interval.
Gate Pulse
Sampling Pulse
Trigger Pulse
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.
67. In sampling CRO the spot of the electron beam is positioned ____
Vertically
Horizontally
Both vertically and Horizontally
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.
68. In sampling oscilloscope as many as one thousand samples are taken to reconstruct ______.
One Cycle
Two Cycle
Ten Cycle
Thousand Cycle
Answer.2. Sampling Pulse
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 input signal of frequency as high as 1,000 MHz as many as 1,000 samples are used to reconstruct the original waveform.
69. In sampling CRO at the beginning of each sampling cycle, the _____ activates an oscillator.
Sampling Pulse
Trigger Pulse
Gate Pulse
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.
70. In sampling CRO the comparator compares the ____
Input voltage and Ramp Voltage
Input voltage and Output voltage
Ramp voltage and output voltage
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.
71. The resolution of the final image on the screen of the sampling oscillator is determined by
Staircase Generator
Attenuator
Ramp Generator
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 a larger step size. the horizontal spacing between the C.R.T. spots is greater for the reconstruction of the input waveform.
72. The main advantage of sampling oscilloscopes are
Clear waveform
High electrical signal generated
Analyze high-frequency signal
All of the above
Answer.4. All of the above
Explanation:
Advantages of sampling oscilloscopes are
The waveform display is clear.
High-speed electrical signals can be produced.
Very high-frequency performance can be achieved.
The sampling techniques allow the design of the oscilloscope with a wide bandwidth frequency.
The sampling oscilloscopes are used for analyzing very high-frequency signals.