Mechanical Measurement And Metrology - Dec 2014

Mechanical Engineering (Semester 4)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks. 1 (a) Differentiate the followings briefly.
(i) Precision and Accuracy
(ii) Line and End Standards
(iii) Systematic Error and Random Error
(iv) Instrument and Measurement(7 marks) 1 (b) Explain the following characteristics of measurement system:
(i) Dead zone (ii) Drift (iii) Sensitivity (iv) Threshold (v) Fidelity (vi) Linearity (vii) Overshoot(7 marks) 2 (a) Classify measurement methods. Discuss Primary, Secondary and tertiary methods of measurement with suitable examples.(7 marks)

Answer any two question from Q2 (b) or Q2 (c)

2 (b) Define detector-transducer. Discuss briefly different types of mechanical detector-transducer with neat sketch.(7 marks) 2 (c) Define LVDT. Explain its working with neat sketch. Also state its practical application.(7 marks)

Answer any two question from Q3 (a), (b) or Q3 (c), (d)

3 (a) Sketch micrometer. Label all important parts of it. Also explain least count of micrometer with suitable example.(7 marks) 3 (b) Describe followings with neat sketch.
(i) Slip Gauge (ii) Dial Indicator(7 marks) 3 (c) What is comparator? Why it required? Give its classification in detail.(7 marks) 3 (d) Explain principle of Auto-Collimator. Sketch Auto-Collimator and state its application.(7 marks)

Answer any two question from Q4 (a), (b) or Q4 (c), (d)

4 (a) Sketch two wire methods for measuring effective diameter of screw thread. Also give its limitation.(7 marks) 4 (a) Describe working and construction of Tomlinson surface tester for surface measurement.(7 marks) 4 (b) List out the various elements required to be check during inspection of gear. Describe methods of measurement of any two in detail.(7 marks) 4 (b) Discuss any three alignment test conducted on radial drilling machine.(7 marks)

Answer any two question from Q5 (a), (b) or Q5 (c), (d)

5 (a) Write short note on Thermister.(7 marks) 5 (b) Classify force balance pressure gauges. Explain any one in detail.(7 marks) 5 (c) Describe construction and working of optical pyrometer.(7 marks) 5 (d) Explain followings briefly.
(i) Stroboscope
(ii) Resonance (vibrating reed) tachometer(7 marks)