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Posted Date: 26 Jan 2009 Posted By: kishore Member Level: Gold
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2006 Jawaharlal Nehru Technological University III B.Tech II Semester Regular Examinations, Apr/May 2006 METROLOGY Question paper
Code No: RR320302 Set No. 2
III B.Tech II Semester Regular Examinations, Apr/May 2006
METROLOGY
(Mechanical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Explain the terms: Unilateral tolerance system, bilateral tolerance system.
Clearly explain the differences between them
(b) For each of the following shaft and hole pair, calculate shaft tolerance, hole
tolerance and analyze whether the pair is
i. Clearance fit
ii. Transition fit
iii. Interference fit.
Pair 1: Hole:- 50+0.25
+0.00mm Shaft:- 50+0.05
+0.005mm
Pair 2: Hole:- 30+0.05
+0.00mm Shaft:- 30-0.02
+0.05mm
Pair 3: Hole:- 25+0.04
+0.00mm Shaft:- 25+0.06
+0.04mm
Sketch the three fits. [8+8]
2. (a) Explicate the measurements reading on a micrometer and desirable precau-
tions while reading measurements.
(b) Describe the working mechanism of a dial indicator. [8+8]
3. (a) Explicate the principle of sine bar for angular measurement
(b) Show the arrangement of angle gauges with neat sketches to measure
i. 100 - 20’ and
ii. 56.260 with minimum number of gauges from a set of
[10
, 30
, 90
, 270
, 410]
[1’, 3’, 9’, 27’] and
[3”, 6”, 18”, 38”] [8+8]
4. (a) Elucidate terms : gauges tolerance and wear allowance as assignable to limit
gauges.
(b) Design general type GO and NO-GO gauges for components having 65 H7/m6
fit. The basic size falls in the diameter range of 50-80mm. The fundamental
deviation for ‘m’ shaft=(IT7 -IT6) microns. The multipliers for 7 and 6 grades
are 16 and 10. Take wear allowance as 10% of gauge tolerance. Sketch the
gauges with values. [6+10]
5. What are the numerous fringe contours in checking slip gauges by means of optical
flats? Describe the method of experimental testing of such surfaces.
6. (a) What are the factors affecting surface roughness? What is the necessity for
controlling the surface texture?
(b) Explain the details of construction, principle and operation of stylus. [8+8]
7. (a) Describe the working principle of a solex pneumatic comparator.
(b) Explain the various tests on shaper for alignment. [8+8]
8. (a) Explain the measurement of effective diameter using
i. thread micrometer
ii. one wire method.
(b) Analyze gear metrology of
i. Run out
ii. back lash.
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