Electro Mechanical Measurement and Instruments — Summer 2023

Define the following terms:

Experiment (ii) Measurement (iii) Instrumentation.

Compare direct measurement and indirect measurement methods with suitable examples.

Give detail classification of measuring instrument.

Explain requirement of signal conditioning in measurement with suitable example.

What is tertiary measurement? Explain it with any one example.

Explain hand speed tachometer as generalized measurement system and explain function of each component.

Explain construction and working of RVDT with neat sketch.

Briefly explain working of mercury in glass thermometer.

With schematic diagram explain working of optical torsion meter.

Define the following terms for a measuring instrument:

Threshold (ii) Repeatability (iii) Reproducibility (iv) Dead Zone (v) Backlash (vi) Accuracy (vii) Resolution

Briefly describe the factors which affect the measuring process.

Write a short note on piezoelectric accelerometer.

What is the function of dynamometer? Explain working and construction of eddy current dynamometer with sketch.

Define zero drift, span drift and zonal drift.

For a measurement system compare time domain analysis with frequency domain analysis with suitable examples.

What are the different standard inputs for studying the dynamic response of a measuring system? Explain in detail.

Write a short note on Hysteresis.

Explain any four dynamic characteristics of a measuring instrument.

By using a micrometer screw the following readings were taken while measuring the diameter of a shaft in mm. 25.34, 25.38, 25.56, 25.47, 25.42, 25.44, 25.53, 25.48, 25.40, 25.59 Assuming that only random errors are present, calculate the following:

Arithmetic mean (ii) Average Deviation (iii) Standard deviation (iv) Variance1

Differentiate between static error and static correction.

What are the major points to be considered for setting the primary standards?

What are the sources of errors? Explain in detail.

What are the advantages of PMMC instrument?

Abourdon tube pressure gauge indicates output between 0.0 bar and 50.0 bar. The gauge shows the value of 12.6 bar for a given input of 12.7 bar. Determine the values of absolute error and correction. Also express the error as a function of true value and full-scale deflection.

Give detail classification of transducers with examples.