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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- IV EXAMINATION — SUMMER 2020
Subject Code: 3141901 Date: 26/10/2020
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Subject Name: Mechanical Measurement and Metrology
Time: 10:30 AM TO 01:00 PM
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define terms: (i) Metrology (ii) Accuracy (iii) Precision [03]
(b) Define the following characteristics of measurement system: [04]
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(1) Dead zone, (ii) Drift, (iii) Calibration, (iv) Hysteresis(c) Explain generalized measurement system using suitable example. [07]
Q.2 (a) What do you understand by systematic errors and random errors? [03]
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(b) Why sine bar is not preferred for angles greater than 45°? Explain. [04](c) Enlist methods of measurements. Explain Slip gauges with wringing process. [07]
OR
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(c) Describe with neat sketch the construction and working of a micrometer. [07]
Q.3 (a) Define following terms related to screw thread measurement: [03]
(1) Lead, (ii) Pitch, (iii) Crest
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(b) Explain line and end standards with examples. [04]
(c) Explain three wire method for measuring effective diameter of a thread. [07]
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ORQ.3 (a) Write the advantages of coordinate measuring machines [03]
(b) Explain Parkinson gear tester with a neat sketch. [04]
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(c) Describe with neat sketch the construction and use of gear tooth vernier caliper. [07]
Q.4 (a) Define fit and with the help of neat sketches, explain the different types of fits. [03]
(b) Write short note on proving ring type load cell. [04]
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(c) Describe the working and construction of LVDT with neat sketch. [07]
OR
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Q.4 (a) Explain light wave length standard. [03](b) Explain the working principal of pneumatic comparators with neat sketch. [04]
(c) Explain working of McLeod gauge for pressure measurement. [07]
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Q.5 (a) Define unilateral and bilateral tolerances. Give examples for each. [03]
(b) Explain the terms interchangeable manufacture and interchangeable assembly. [04]
(c) Explain optical pyrometer for measurement of temperature. [07]
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OR
Q.5 (a) How are temperatures measuring instruments classified? [03]
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(b) Explain in brief the principle of thermocouple stating illustrations. [04](c) Describe the construction and working of resistance temperature detector (RTD) with neat sketch. [07]
Total Marks: 70
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This download link is referred from the post: GTU BE 2020 Summer Question Papers || Gujarat Technological University
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