Mechanical Measurement and Metrology — Summer 2021

Discuss the elements of screw thread with a neat sketch.

Explain Accuracy and Precision with an example.

Define absorption dynamometer. With a neat sketch explain the working of Rope Brake dynamometer.

What are the various possible sources of error in measurements?

Briefly explain the following terms (i) Calibration (ii) Hysteresis (iii) Over- shoot and (iv) Dead Zone.

Explain the use of sine bar with a neat sketch, also write advantages and limitations of sine bar.

Write a short note on Coordinate Measuring Machines.

Differentiate between line and end standards.

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

Describe the construction and working of a sigma comparator. Discuss its advantages and disadvantages.

Explain why hole basis system is generally preferred.

Define unilateral and bilateral tolerances. Give examples for each.

What is an LVDT? Explain its working principle with a neat sketch.

Define (i) Circular Pitch (ii) Module and (iii) Pressure Angle.

Explain Parkinson gear tester with a neat sketch.

Explain three wire method for measuring effective diameter of a thread. State its advantages over two wire method.

What is a comparator? Give its classification.

Derive the expression for best wire size for the measurement of effective diameter of a screw thread.

With the help of a neat sketch derive an equation for measuring gear tooth thickness using constant chord method. State its advantages.

Explain the principle of thermocouple.

Classify resistance strain gauge and explain any two.

With a neat sketch explain the construction and working of bourdon tube pressure gauge.

How are temperature measuring instruments classified?

Explain the working principle of Proving Ring.

Explain the construction and working principle of optical pyrometer along with its advantages and disadvantages.