Gujarat Technological University 2010-4th Sem B.E Mechanical Engineering , , Mechanical , Subject Name: Mechanical measurement & Metrology - Question Paper
Instructions:
1. Attempt all ques..
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Seat No. Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
B.E. Sem-IV Examination June- 2010 Subject code: 141901 Subject Name: Mechanical measurement & Metrology Date: 18 / 06 / 2010 Time: 10.30 am - 01.00 pm
Total Marks: 70
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Describe with sketch International Prototype Meter (Material Length Standard) 07 stating material composition and limitations.
Q.1 (a (b
Q.2 (a (b (b
Q.3 (a (b
Q.3 (a (b
Q.4 (a (b
Q.4 (a (b
Describe with sketch the construction and working of a micrometer. Explain how 07 least count is found and reading is taken. What is zero error?
Describe with sketch following stating application: 07
(i) Slip gages (ii) Telescopic gage (iii) Sine bar and (iv) Sine Center
Describe with sketch the construction and working of Sigma Comparator. 07
OR
Describe with sketch the construction and use of a Combination Set stating 07
limitation.
Describe with sketch the construction and use of Gear Tooth Vernier Caliper. 07 How is the gear tooth thickness at PCD measured?
Describe with sketch principle, construction and use of Autocollimator. 07
OR
What is an effective diameter of threads? State its significance. Explain with 07 sketch Measurement of Effective Diameter by Two Wire method stating limitation..
Explain Surface Texture and Elements of Surface Roughness. 07
Explain with a block diagram Generalized Measuring System and its four 07 functional elements. Show a block diagram of measurement scheme for Weighing Machine.
Explain the construction and working of LVDT stating applications. 07
OR
List and explain characteristics of measuring devices stating illustrations. 07
Explain the principle, working and method of speed measurement using 07
Stroboscope stating an illustration.
Explain with sketch construction and working of Piezometer & U-Tube 07
Q.5
(a
(b
(a
(b
Manometer stating application.
List and explain with sketch types of expansion thermometer stating application. 07
OR
Describe with sketch construction and working of Dead Weight Pressure Gauge 07 Tester. State sources of error and their remedies.
Q.5
Explain in brief the principles of thermocouple stating an illustration. 07
A Chromel-Alumel thrmocouple is assumed to have nearly linear operating range up to 1100 C with emf (reference 0 C) 45.14 mV at this temperature. The thermocouple is exposed to a temperature of 840 C. The potentiometer is used as cold junction and its temperature is estimated to be 25
C. Calculate the emf indicated on the potentiometer.
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