Electro Mechanical Measurement and Instruments — Winter 2023

Define the terms measurement and instrumentation.

Compare direct and indirect methods of measurement with suitable examples.

Explain significance of measurement in detail with suitable examples.

Briefly explain calibration process for a measuring instrument.

Explain any four dynamic characteristics of a measuring system.

Draw block diagram of a generalized measurement system and explain function of each block.

Define the following static characteristics of a measuring instrument:

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

Derive the expression for zero order system.

Briefly explain second order system responses for step input, ramp input & sinusoidal input.

Explain working and construction of RTD in detail with any one application.

Draw block diagram of digital data acquisition system.

Explain various modes of measurement.

Explain working of permanent magnet moving coil instrument with sketch.

Compare thermocouple and thermistor.

What are the factors which cause drift? Explain with suitable examples.

Explain working and construction of hydraulic and pneumatic load cells with the help of sketches.

Adigital weight measuring instrument with a scale range of 0.0 kg to 20.0 kg shows a weight of 15.4 kg. The true value of the weight is 15.7 kg. Determine the values of absolute error and correction. Also express the error as a function of the true value.

What are the various factors which affect the measuring process?

What are primary standards? Explain important points which are to be considered for setting up the primary standard.

Write a short note on piezoelectric accelerometer.

Explain working of hand speed tachometer with sketch.

Explain inductive and capacitive transducers with examples.

What are the various sources of errors in measurement?

Write a short note on optical torsion meter.

Explain working and construction of eddy current dynamometer with sketch.