Mechanical Measurement and Metrology — Summer 2020

Explain generalized measurement system using suitable example.

Define terms: (i) Metrology (ii) Accuracy (iii) Precision

Define the following characteristics of measurement system:

Dead zone, (ii) Drift, (iii) Calibration, (iv) Hysteresis

Enlist methods of measurements. Explain Slip gauges with wringing process.

What do you understand by systematic errors and random errors?

Why sine bar is not preferred for angles greater than 45˚? Explain.

Describe with neat sketch the construction and working of a micrometer.

Explain line and end standards with examples.

Define following terms related to screw thread measurement:

Lead, (ii) Pitch, (iii) Crest

Explain three wire method for measuring effective diameter of a thread.

Write the advantages of coordinate measuring machines

Explain Parkinson gear tester with a neat sketch.

Describe with neat sketch the construction and use of gear tooth vernier caliper.

Define fit and with the help of neat sketches, explain the different types of fits.

Write short note on proving ring type load cell.

Describe the working and construction of LVDT with neat sketch.

Explain light wave length standard.

Explain the working principal of pneumatic comparators with neat sketch.

Explain working of McLeod gauge for pressure measurement.

Define unilateral and bilateral tolerances. Give examples for each.

Explain the terms interchangeable manufacture and interchangeable assembly.

Explain optical pyrometer for measurement of temperature.

How are temperatures measuring instruments classified?

Explain in brief the principle of thermocouple stating illustrations.

Describe the construction and working of resistance temperature detector (RTD) with neat sketch.