Measurement, Conversion and Control Questions

Strain gauge fundamentals — How large is the typical resistive change of a bonded strain gauge under normal strain, and what parameter governs it?

Data-conversion accuracy — During A/D conversion, the analog input can change while the converter is deciding the code. The error introduced specifically by input change during the conversion interval is called:

Thermocouple measurement — What is the primary purpose of compensation in a thermocouple measurement system?

LVDT fundamentals — In a linear variable differential transformer (LVDT), which component is the moving element that couples mechanically to the measured displacement?

SCR terminology — The holding current of a silicon-controlled rectifier (thyristor) is best defined as:

Temperature sensors — Which device behaves similarly to an RTD (resistance varies with temperature) but exhibits a negative temperature coefficient (resistance decreases as temperature increases)?

Sample-and-hold (S/H) performance specifications: Which of the following parameters is specifically defined for a sample-and-hold circuit used ahead of an ADC in mixed-signal systems?

Power electronics application: What is a zero-voltage switch (ZVS) primarily used for in high-current switching to a load?

RTD interfacing practice: Resistance temperature detectors (RTDs) are typically connected with other fixed resistors in which network for measurement linearization and sensitivity?

Thyristor control: A silicon-controlled rectifier (SCR) can be turned off (commutated) by which method under normal operation?

Thermocouple signal levels: What is the typical output voltage magnitude produced by a standard thermocouple sensor under normal temperature ranges?

Thermocouple wiring effects: What is true about the connections to a thermocouple (lead junctions) in practical measurement systems?

Temperature sensing technologies: Which of the following sensor types can be used to measure temperature in practical electronics and instrumentation?

Pressure transducers and resistance behavior: evaluate the statement—“A pressure transducer is a device whose resistance changes inversely in proportion to applied pressure.” Choose the most accurate assessment.

Thermocouple measurement accuracy: regarding precision temperature measurement, is it necessary to account for thermocouple junction connections (polarity, reference/cold-junction compensation, and lead effects) to achieve high accuracy?

Sampling and quantization fundamentals: evaluate the statement—“The change in value of the analog signal during the sampling process produces what is called the quantization error.”

Sample-and-hold (S/H) building blocks: does a minimal S/H circuit necessarily require an instrumentation amplifier, or is a buffer amplifier sufficient when paired with an analog switch and a hold capacitor?

Noncontact displacement sensing: among common displacement transducer families, do optical and capacitive types qualify as noncontacting measurement methods?

Strain measurement fundamentals — operating principle: A conventional electrical strain gauge (as used in Wheatstone bridges for stress/strain measurement) operates primarily on which physical effect? The claim states: “A strain gauge uses the principle of capacitance for its operation.” Decide whether this statement is valid.

Motion transducers — what can be measured directly: Displacement, velocity, and acceleration are all measurable using appropriate motion transducers (e.g., LVDT, tachogenerator/encoder, and accelerometer) designed for each quantity. Evaluate this statement.