FREE Bachelor of Electrical Engineering Measurement and Instrumentation Questions and Answers Flashcards
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Read the first 6 FREE Bachelor of Electrical Engineering Measurement and Instrumentation Questions and Answers flashcards as text
What is the function of a current transformer (CT) in measurement systems?
Answer: To step down high currents to measurable levels
A current transformer reduces high primary currents to a standardized lower secondary current (typically 5 A) suitable for measurement instruments.
Which of the following best describes the term 'sensitivity' of a measuring instrument?
Answer: The ratio of output response to input change
Sensitivity is defined as the ratio of the change in output (or response) to the change in input quantity being measured.
In oscilloscope measurements, what does the time base control adjust?
Answer: Horizontal sweep speed
The time base control sets the horizontal sweep speed in time per division, determining how the signal is displayed along the time axis.
What principle does a thermocouple use to measure temperature?
Answer: Seebeck effect
A thermocouple generates a voltage based on the Seebeck effect, where a temperature difference between two dissimilar metal junctions produces an electromotive force.
Which type of ADC (Analog-to-Digital Converter) offers the fastest conversion speed?
Answer: Flash (parallel) ADC
Flash ADCs use parallel comparators to convert the analog input in a single clock cycle, making them the fastest ADC architecture available.
What is the purpose of a guard ring in high-resistance measurements?
Answer: To eliminate leakage current errors
A guard ring intercepts surface leakage currents and diverts them away from the measuring circuit, preventing them from causing measurement errors.