Mechanical Measurement and Metrology - Jun 2015
Mechanical Engineering (Semester 4)
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) Give the definition and objectives of metrology.(6 marks) 1 (b) Explain line standard and end standard with examples.(6 marks) 1 (c) The slip gauge set M38 consists of the following: List the slip gauges to build the following:- i) 29.875mm ii) 15.09mm
|Range (mm)||Steps (mm)||Pieces|
i) Diameter 30 falls in the dia range 18-30, upper deviation for 'd' shaft is -16D0.44.
ii) i=0.45 D1/2+0.001D. Tolerance for IT8=25i, Tolerance for IT10=64i.(8 marks) 3 (a) Sketch and explain sigma comparator.(8 marks) 3 (b) Explain with a neat sketch the construction and working principle of solex pneumatic comparator.(6 marks) 3 (c) Give the systematic way of building angle gauges to set up angle of 33°, 16', 42'', using a standard set of 13 pieces. Also sketch the combination of angle gauges used.(6 marks) 4 (a) Explain the principle of interferometry with the aid of sketch.(6 marks) 4 (b) How do you find effective diameter of a screw thread using two-wire method?(6 marks) 4 (c) With a sketch, explain the construction of a tool maker's microscope. What are its applications?(8 marks) 5 (a) Explain with examples various stages of a generalized measurement system.(8 marks) 5 (b) Define: Sensitivity, Hysteresis, Repeatability.(6 marks) 5 (c) Give advantages and disadvantages of Electrical transducers.(6 marks) 6 (a) With a block diagram, explain telemetry.(6 marks) 6 (b) With a neat sketch, explain the working principle of a CRO.(8 marks) 6 (c) What are X-Y plotters? With a block diagram, explain its working.(6 marks) 7 (a) With a neat sketch, describe the Pirani gauge used for pressure measurement.(8 marks) 7 (b) With a neat sketch, explain the working principle of prony brake dynamometer.(6 marks) 7 (c) Describe with a neat sketch, the analytical balance.(6 marks) 8 (a) Sketch and explain the working of optical pyrometer.(8 marks) 8 (b) Describe the steps to be taken for the preparation of specimen and mounting of strain gauges.(6 marks) 8 (c) What is Thermocouple? State the laws thermocouple.(6 marks)