Hall Ticket No Question Paper Code: BCC201
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
M.Tech I Semester End Examinations (Regular) February, 2017
Regulation: IARE-R16
PRECISION ENGINEERING
(CAD/CAM)
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. Discuss the various errors in machine tools
Explain the concept of accuracy of machine tool
2. Explain about spindle rotation accuracy
Discuss the significance of spindle rotation error for machine tools.
UNIT II
3. Discuss about grouped datum system with spigot and recess.
Differentiate between datum and datum systems
4. Explain grouped datum plane with pins and holes with neat sketch.
Discuss about degrees of freedom for datum systems
UNIT III
5. Explain about process capability.
Distinguish between Cp and Cpk.
6. Define fits. Describe the various types of fits in brief.
Differentiate between
i. tolerance and allowance
ii. maximum and minimum metal conditions
UNIT IV
7. Determine the tolerances on the hole and the shaft for a precision running fit designated by 50H7g6.
50mm lies between the range 30-50mm
The fundamental deviation of g shaft
The multipliers for grades 7 and 6 are 16i and 10i
State the actual maximum and minimum size of the hole and shaft and maximum and minimum
clearances
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8. What is meant by datum feature? and How single and two datum features are indicated on
drawing?
What are the uses of tolerance chart?
UNIT V
9. Write a brief note on laser as a means of alignment testing.
Sketch and describe the optical system of the N.P.L flatness interferometer.
10. Describe briefly about co-ordinate measuring machine (CMM).
State the advantages and possible sources of errors in CMM.
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