Download GTU B.Tech 2020 Summer 4th Sem 2141901 Mechanical Measurement And Metrology Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- IV EXAMINATION — SUMMER 2020

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Subject Code: 2141901 Date: 27/10/2020
Subject Name: MECHANICAL MEASUREMENT & METROLOGY
Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) What is measurement error? Classify errors and explain any one in short. 03
(b) Explain the working principal of Pneumatic comparators with a neat sketch. 04
(c) Describe construction, working principle and applications of Vernier height gauge. 07

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Q.2 (a) Briefly explain the procedure of finding least count of a Vernier Caliper. 03
(b) Explain the term Calibration with suitable example. 04
(c) Classify torque and power measurement techniques. Explain torsion bar dynamometer. 07

OR

(c) State the various types of load cells and explain any one of them with neat sketch. 07

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Q.3 (a) Explain the terms Resolution and Threshold with a suitable example. 03
(b) Explain hemispherical bore gauge with applications. 04
(c) Explain Tool Maker’s Microscope with a neat sketch. 07

OR

Q.3 (a) Explain working of Liquid in glass Thermometer with a neat sketch. 03

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(b) Explain Radiation Pyrometer. 04
(c) Compare RTD and thermistors as temperature measuring device. 07

Q.4 (a) Explain adverse effects of poor surface finish. 03
(b) Briefly explain working of rotameter as flow measuring device with a neat sketch. 04
(c) Explain working of Mcleod gauge for pressure measurement. 07

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OR

Q.4 (a) Explain Indirect Method of measurement. 03
(b) Why sine bar is not preferred for angles greater than 45°? Explain. 04
(c) Distinguish between Primary, Secondary, Tertiary and working standards of length. 07

Q.5 (a) Give classification of threads. 03

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(b) List out various elements to be checked for accuracy of gear and describe any two. 04
(c) Explain Two wire method for measuring effective diameter of thread with a neat sketch. 07

OR

Q.5 (a) Explain root mean square value used for surface roughness measurement. 03
(b) Explain wringing process of slip gauges. 04

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(c) Give classification of comparators and explain Dial indicator with sketch 07