81. The waveform in Digital storage oscilloscope is stored in _________
Compressed form
Analog form
Digital form
Mixed form
Answer.3. Digital form
Explanation:
In this digital storage oscilloscope, the waveform to be stored is digitized and then stored in digital memory.
The digital storage oscilloscope eliminates the disadvantages of the analog storage oscilloscope.
It replaces the unreliable storage method used in analog storage oscilloscope with digital storage with the help of memory.
The memory can store data as long as required without degradation. It also allows the complex processing of the signal by the high-speed digital signal processing circuits.
82. The type of waveform analyze by Digital storage oscilloscope is _______
Numerical value
Visual Display
RMS Value
All of the above
Answer.4. All of the above
Explanation:
Digital oscilloscopes usually analyze waveforms and provide numerical values as well as visual displays.
These values typically include averages, maxima and minima, root mean square (RMS) and frequencies.
They may be used to capture transient signals when operated in a single sweep mode, without the brightness and writing speed limitations of an oscilloscope.
83. Which cathode ray tube is used in a digital storage oscilloscope?
Multi-trace
Dual-trace
Modern
Conventional
Answer.4. Conventional
Explanation:
The conventional cathode ray tube is used in this oscilloscope hence the cost is less. The power to be applied to memory is small and can be supplied by a small battery.
Due to this, the stored image can be displayed indefinitely as long as power is supplied to memory. Once the waveform is digitized then it can be further loaded into the computer & can be analyzed in detail.
84. To ensure no loss of information in Digital storage oscilloscope the sampling rates of oscilloscope is ______
10 samples/sec
100 samples/sec
10000 samples/sec
100000 samples/sec
Answer.4. 100000 samples/sec
Explanation:
The digitizing the analog input signal means taking samples at periodic intervals of the input signal.
The rate of sampling should be at least twice as fast as the highest frequency present in the input signal. This ensures no loss of information.
The sampling rates as high as 100,000 samples per second are used. This requires a very fast conversion rate of an A/D converter.
85. Power requirement of Digital storage oscilloscope is _________
Low
High
Medium
Zero
Answer.1. Low
Explanation:
The conventional cathode ray tube is used in this oscilloscope hence the cost is less. The power to be applied to memory is low and can be supplied by a small battery.
Due to this, the stored image can be displayed indefinitely as long as power is supplied to memory. Once the waveform is digitized then it can be further loaded into the computer & can be analyzed in detail.
86. In Digital storage oscilloscope the analog signal is digitized using _______
D/A converter
Oscillator
A/D converter
Rectifier
Answer.3. A/D converter
Explanation:
To digitize the analog signal, an analog to digital (A/ converter is used.
The output of the vertical amplifier is applied to the A/D converter section.
The main requirement of an A/D converter in the digital storage oscilloscope is its speed, while in digital voltameters accuracy and resolution were the main requirements.
The digitized output is needed only in the binary form and not in BCD.
The successive approximation type of A/D converter is used in the digital storage oscilloscopes.
87. What is the main advantage of using a digital storage oscilloscope?
Infinite storage time
Easy operation
X-Y plots, B-H curve can be measured
All of the above
Answer.4. All of the above
Explanation:
The advantages of digital storage oscilloscopes are as follows
The storage time is infinite.
It can be easily operated and has more capability.
Digital storage oscilloscope allows flexible display property.
The cursor measurement is possible.
The X-Y plots, B-H curve, P-V diagrams can be displayed
88. 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.
89. 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
90. 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.
