STUPIDSID
1 (a)
Briefly explain:
i) International prototype metre
ii) Reference standard
iii) Wringing phenomenon
iv) Significance of wavelength standard.
i) International prototype metre
ii) Reference standard
iii) Wringing phenomenon
iv) Significance of wavelength standard.
8 M
1 (b)
What are Airy points? Explain in detail.
4 M
1 (c)
Using NPL method, derive equation for calibrating end standard from line standards.
8 M
2 (a)
What are the concepts of interchangeability and selective assembly? Which is advantageous?
6 M
2 (b)
Briefly explain:
i) Go-gauges, ii) NO-GO gauges, iii) Gauge tolerance and wear allowance.
i) Go-gauges, ii) NO-GO gauges, iii) Gauge tolerance and wear allowance.
6 M
2 (c)
Determine the tolerance on the hold and shaft for a fit designated by 50H7g6, diameter step 50 to 80 mm; fundamental deviation for shaft=-2.5 D0.34 in micron; 1T6=10i and IT7=16i; i=0.45 \[ \sqrt[3]{D} +0.001D \] in micron. State the actual maximum and minimum size of the hole and shaft and maximum and minimum clearances.
8 M
3 (a)
What are comparators? How do they differ from measuring instruments?
6 M
3 (b)
Explain the principle of sine bar.
6 M
3 (c)
Explain with sketch, the construction and working of LVDT.
8 M
4 (a)
What is the principle of interferometry? How is it adopted in optical interferometer?
6 M
4 (b)
Derive an expression for the chordal tooth thickness of gear.
6 M
4 (c)
Explain 3-wire method of measuring effective diameter of screw thread.
8 M
5 (a)
What is the significance of measurement?
4 M
5 (b)
Explain the three stages of generalized measuring method using any one example.
8 M
5 (c)
Differentiate:
i) Sensor and transducer
ii) Primary and secondary transducer
iii) Accuracy and sensitivity
iv) Error and correction
i) Sensor and transducer
ii) Primary and secondary transducer
iii) Accuracy and sensitivity
iv) Error and correction
8 M
6 (a)
What is the necessity of modifying devices? What are the advantages of electrical modifying devices?
6 M
6 (c)
With a block diagram, explain the working of an x-y plotter.
8 M
7 (a)
Briefly explain how pressure can be measured with elastic transducer.
6 M
7 (b)
What are the methods of force measurement? Give examples.
6 M
7 (c)
Explain with a neat sketch proxy brake dynamometer.
8 M
8 (a)
Explain the working principles of radiation pyrometer and thermocouple.
8 M
8 (b)
Briefly explain: i) Strain gauge material; ii) Strain gauge factor; iii) Thermocouple material.
12 M
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