Q. 1
Electronics Engineering
Difficulty: Medium
(1 Mark)
In a Digital Storage Oscilloscope (DSO), what is the relationship between the analog bandwidth and the minimum required real-time sampling rate recommended for accurate reconstruction of non-sinusoidal waveforms?
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Step-by-Step Explanation & Concept Rationale
While Nyquist requires fs >= 2*BW for pure sine waves, capturing transient square edges, risetimes, and glitch details in real-time DSOs requires a sampling rate of at least 4x to 5x the analog bandwidth.
Q. 2
Electronics Engineering
Difficulty: Easy
(1 Mark)
What is the primary function of the trigger circuit in an oscilloscope?
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Step-by-Step Explanation & Concept Rationale
The trigger circuit stabilizes recurring waveforms on screen by initiating the horizontal sweep at the same point (voltage threshold and slope) on each cycle.
Q. 3
Electronics Engineering
Difficulty: Medium
(1 Mark)
A 10X passive oscilloscope probe provides which benefit over a 1X probe when measuring high-frequency digital circuits?
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Step-by-Step Explanation & Concept Rationale
A 10X probe attenuates the signal by a factor of 10, but increases input resistance from 1 M to 10 M and significantly reduces tip capacitance, preventing high-frequency loading and waveform distortion.
Q. 4
Electronics Engineering
Difficulty: Medium
(1 Mark)
When calibrating a 10X oscilloscope probe using the scope's 1 kHz square wave test output, a rounded front corner on the square wave indicates:
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Step-by-Step Explanation & Concept Rationale
Under-compensation causes low-pass filtering, resulting in rounded leading corners. Over-compensation causes high-pass overshoot. Adjusting the probe trimmer capacitor flattens the top of the square wave.
Q. 5
Electronics Engineering
Difficulty: Easy
(1 Mark)
What type of instrument is specifically designed to analyze multiple digital logic channels simultaneously and trigger on complex digital bus states?
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Step-by-Step Explanation & Concept Rationale
A logic analyzer captures and displays digital signals across dozens or hundreds of channels, decoding protocols and triggering on word patterns, bus states, and timing violations.
Q. 6
Electronics Engineering
Difficulty: Easy
(1 Mark)
In RF diagnostics, a Spectrum Analyzer displays signals in which domain?
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Step-by-Step Explanation & Concept Rationale
While oscilloscopes display amplitude versus time (time domain), spectrum analyzers display signal power/amplitude versus frequency (frequency domain).
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