Metrology and Quality Control : Question Paper Jun 2015 - Mechanical Engineering (Semester 5)

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Metrology and Quality Control - Jun 2015

Mechanical Engineering (Semester 5)

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.

Answer any one question from Q1 and Q2

1 (a) Explain principle's of Engineering metrology in details.(6 marks) 1 (b) Write a note on laser interferometer.(4 marks) 2 (a) Explain different methods of measuring flatness.(6 marks) 2 (b) Differentiate between primary texture and secondary texture.(4 marks)

Answer any one question from Q3 and Q4

3 (a) Define Taylor's principle.(2 marks) 3 (b) Write a note on floating carriage micrometer.(4 marks) 3 (c) Explain universal measuring machine.(4 marks) 4 (a) Explain principle of interferometry.(2 marks) 4 (b) Write a note on span gauging.(4 marks) 4 (c) Explain Automatic inspection system.(4 marks)

Answer any one question from Q5 and Q6

5 (a) Explain Deming's fourteen points in details.(8 marks) 5 (b) Explain seven New Quality tools.(8 marks) 6 (a) Define cost of prevention, cost of appraisal, cost of internal failure & cost of external failure.(8 marks) 6 (b) Explain seven quality control tools.(8 marks)

Answer any one question from Q7 and Q8

7 (a) Explain in detail OC curve and show following element on OC curve.
i) α-Risk
ii) β-Risk
iii) AOQ
iv) LTPD(6 marks) 7 (b) Two machines producing components are checked up for the statistical stability. Draw the 'P' chart for both machines and comment upon the processes. Sample size for both machines are 200.

Machine A:

Sample No.	1	2	3	4	5	6	7	8	9	10
Defectives	25	28	30	30	20	29	31	26	31	27

Machine B:

Sample No.	1	2	3	4	5	6	7	8	9	10
Defectives	11	08	22	15	12	27	10	15	10	02

(10 marks) 8 (a) Differentiate between single, double and multiple sampling plan.(6 marks) 8 (b) Components are being turned on CNC lathe to a specification of 12.58 ± 0.05mm. Five batches of five components each have been drawn for inspection at 1 hour intervals. The readings are tabulated below.

Batch 1	Batch 2	Batch 3	Batch 4	Batch 4
12.62	12.63	12.62	12.61	12.59
12.60	12.56	12.56	12.66	12.58
12.62	12.60	12.57	12.62	12.57
12.61	12.59	12.58	12.61	12.59
12.65	12.60	12.63	12.60	12.56

i) Determine the process capability.
ii) Determine the three-sigma limits for the x chart.
iii) Draw the control chart and give your assessment. Assume the normal distribution and d₂ for group size 5 is 2.326.(10 marks)

Write short notes on following (Any Three):

9 (a) TPM(6 marks) 9 (b) Six sigma(6 marks) 9 (c) Kanban(6 marks) 9 (d) QFD(6 marks) 9 (e) JIT(6 marks) 9 (f) Poka-yoke.(2 marks)

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