Subject Code: 2141901
GUJARAT TECHNOLOGICAL UNIVERSITY
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SEMESTER-IV(NEW) — EXAMINATION — SUMMER 2019
Subject Name: Mechanical Measurement & Metrology
Time: 02:30 PM TO 05:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1
(a) Define: (i) Precision (ii) Accuracy [03]
(b) State and explain the important elements of measurement. [04]
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(c) Describe with neat sketch International Prototype Meter (Material Length Standard) stating material composition and limitations. [07]
Q.2
(a) Give comparison between comparator and mechanical instruments. [03]
(b) List out advantages and disadvantages of electrical comparators. [04]
(c) Sketch and explain the working of a vernier caliper used for internal and external length measurements? [07]
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OR
(c) Explain with neat sketch the construction and working of Johansson Mikrokator. [07]
Q.3
(a) Explain the working principle of strain gauge load cell with neat sketch. [03]
(b) Explain Eddy-current dynamometer with sketch. [04]
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(c) Describe with sketch proving ring stating its uses and advantages. [07]
OR
Q.3
(a) Give the classification of Tachometers [03]
(b) Explain the working principle of stroboscope. [04]
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(c) Explain hydraulic force meter and pneumatic force meter with advantages and disadvantages. [07]
Q.4
(a) Give the comparison between resistance thermometer and thermocouple. [03]
(b) List out the advantages and disadvantages of thermistors. [04]
(c) Describe with sketch a liquid-in-glass thermometer. Explain its application. [07]
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OR
Q.4
(a) Give the classifications of threads. [03]
(b) Explain the common errors in threads. [04]
(c) Explain surface texture and elements of surface roughness. [07]
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Q.5
(a) State the factors which are responsible for surface finishing. [03]
(b) List out and explain comparison methods of measuring surface finish. [04]
(c) Derive the expression for best wire size. [07]
OR
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Q.5
(a) Give the comparison between systematic errors and random errors [03]
(b) Write a short note on : ‘Coordinate Measuring Machine’ [04]
(c) Explain optical pyrometer with neat sketch. [07]
Date: 17/05/2019
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Total Marks: 70
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