Mechanical Measurement and Metrology - Jun 2014

Mechanical Engineering (Semester 3)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks. 1 (a) Sketch and explain the following
i) Imperial standard.
ii) International prototype.(8 marks) 1 (b) Discuss the following standards of measurements with their characteristics:
i)Line standard
ii) END standard(8 marks) 1 (c) What are the major requirement of slip gauges?(4 marks) 2 (a) Define the following with sketch:
i) Nominal size
ii) Basic size
iii) Actual size
iv) Zero line
v) Allowance.
vi)Fit.(9 marks) 2 (b) Differentiate between Hole basis and shaft basis system with sketch(7 marks) 2 (c) How the plain gauges are classified ?(4 marks) 3 (a) List the characteristics of a comparator.(6 marks) 3 (b) Explain with sketch the principle of a sine bar.(6 marks) 3 (c) Give the combination of angle gauges to obtain the following angles also sketch the arrangement of gauges : i)37°9' 18''; ii)33° 16' 42''.(8 marks) 4 (a) Describe with sketch 3-wire method of measuring effective diameter of the thread(10 marks) 4 (b) Explain with sketch measurement of tooth thickness of a spur gear using gear tooth vernier calliper.(10 marks) 5 (a) What is measurement? Explain the fundamental methods of measurement.(6 marks) 5 (b) Explain
i) Repeatability
ii) Sensitivity
iii) Hysteresis(6 marks) 5 (c) With suitable example, explain the stage of generalized measurement system.(8 marks) 6 (a) Explain with block diagram working of a general purpose oscilloscope.(10 marks) 6 (b) Explain with sketch
i) Stylus type oscillograph
ii) Light beam oscillograph(10 marks) 7 (a) Describe with a neat sketch the working and application of proving ring.(6 marks) 7 (b) With a neat sketch, explain the working of hydraulic dyanamometer for the measurement of torque.(7 marks) 7 (c) Explain the Bridgemen gauge with a neat sketch.(7 marks) 8 (a) Write a note on thermocouple materials.(3 marks) 8 (b) With a neat sketch, explain working of a optical pyrometer.(8 marks) 8 (c) Show with sketch how the strain gauges are mounted to measure in the following cases:
i) Axial strain only
ii) Bending strain only.
iii) Torsion strain only.(9 marks)