GTU Mechanical Engineering (Semester 4)
Mechanical Measurement And Metrology
June 2014
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1 (a) Explain objectives of Metrology.
3 M
1 (b) What are the various possible sources of errors in measurement? Define static error and explain any two static errors with example.
7 M
1 (c) Describe with neat sketch "Imperial standard Yard".
4 M

2 (a) Describe working principle and construction of Vernier micrometer with neat sketch.
7 M
Answer any two question from Q2 (b) or Q2 (c)
2 (b) With the help of neat sketch describe the working principle and construction of an optical comparator with its advantages and limitations.
7 M
2 (c) (i) Write applications and limitations of angle gauges.
3 M
2 (c) (ii) The following observations were obtained while checking angle of tapered piece on one side with the help of two discs (Rollers), slip gauge and dial indicator.
Diameter of larger disc = 40 mm
Diameter of smaller disc = 24 mm
Slip gauge placed between the discs = 30 mm
The dial indicator shows no variation when traversed along the surface of the piece placed over the discs. Draw the sketch of the set up and find angle of taper.
4 M

Answer any two question from Q3 (a), (b) or Q3 (c), (d)
3 (a) Define the following terms for Screw thread:
i) Major
Diameter
ii) Minor Diameter
iii) Pitch
iv) Lead
v) Flank angle
vi) Helix angle
3 M
3 (a) With neat sketch explain the construction and working of bourdon tube pressure gauge and also write merits and demerits of its.
7 M
3 (b) Explain the measurement of effective diameter for internal screw threads with neat sketch
4 M
3 (b) Explain in brief the following with neat sketch
i) Prony brake dynamometer and
ii) Rope brake dynamometer
7 M
3 (c) Explain three wire method to measure the effective diameter of given screw thread with neat sketch.
7 M

Answer any two question from Q4 (a), (b) or Q4 (c), (d)
4 (a) Explain Parkinson gear tester with neat sketch.
4 M
4 (b) A spur gear of 8 mm module has 50 teeth calculate following proportion: Pitch circle diameter, Addendum and Dedendum, Tooth working height and base pitch. Assume clearance to be 0.25 module. Spur gear has pressure angle of 20°.
3 M
4 (c) With neat sketch describe the construction working of Tomlinson surface roughness tester with its advantages and disadvantages.
7 M
4 (c) Describe the construction and working of resistance temperature Detector (RTD) with its advantages and disadvantages.
7 M
4 (d) Explain the various modes of measurements with two examples.
7 M

Answer any two question from Q5 (a), (b) or Q5 (c), (d)
5 (a) Define Flatness and describe a method to find out the flatness of a surface plate.
7 M
5 (b) Define squareness. Explain with neat sketch the following methods or measuring the squareness.
i) Indicator method
ii) Auto collimator method
7 M
5 (c) Explain surface texture and elements of surface roughness.
7 M
5 (d) Explain with neat sketch the principle, construction and working of Johansson Mikrokator.
7 M



More question papers from Mechanical Measurement And Metrology
SPONSORED ADVERTISEMENTS