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Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-IV (NEW) EXAMINATION - WINTER 2020
Subject Code: 3141901 Date:09/02/2021
Subject Name: Mechanical Measurement and Metrology
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Time:02:30 PM TO 04:30 PM Total Marks:56Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) What do you understand by measurement? 03
(b) What is the difference between Line standard and End standard? 04
(c) State various sources of errors. What are the difference between systematic error and random error? 07
Q.2 (a) Explain the term range and sensitivity. 03
(b) What is tolerance? Why tolerance are specified? 04
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(c) Define fit. Describe various types of fits. 07
Q.3 (a) Give the classification of comparators. 03
(b) Explain Dial indicator. 04
(c) Explain with neat diagram, working principle and application of Sigma comparator. 07
Q.4 (a) Give the classification of threads. 03
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(b) Explain various forms of gear teeth. 04
(c) Describe the construction and working of Tool maker's microscope. 07
Q.5 (a) Differentiate: Precision and accuracy. 03
(b) Explain the term hysteresis and repeatability. 04
(c) Explain the two-wire method of measuring the effective diameter of a screw thread. 07
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Q.6 (a) Write the advantages of lasers. 03
(b) Describe LVDT giving its advantages, limitations & field of applications. 04
(c) Write a short note on Cathode ray Oscillographs. 07
Q.7 (a) Explain slip gauges. 03
(b) Explain rope brake dynamometer. 04
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(c) Explain McLeod gauge with a diagram. 07
Q.8 (a) Give the classification of instruments for pressure measurement. 03
(b) Explain the principle of electrical Strain gauges 04
(c) Explain the principles of thermocouples stating an illustrations. 07
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