Question Paper: Metrology and Quality Control : Question Paper Dec 2015 - Mechanical Engineering (Semester 5) | Pune University (PU)
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## Metrology and Quality Control - Dec 2015

### Mechanical Engg (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.

### Solve any one question from Q1 and Q2

1 (a) Define uncertainty in measurement and state repeatability and reproducibility of measurement(6 marks) 1 (b) Explain angle Dekker with ray diagram and its application.(4 marks)

### Write short notes on (any three):

10 (a) ISO 9000(5 marks) 10 (b) Quality audit.(5 marks) 10 (c) FMECA(5 marks) 10 (d) Six sigma(5 marks) 10 (e) 5s(5 marks) 2 (a) Explain N.P.L. Flatness interferometer with neat sketch and write its application.(6 marks) 2 (b) Explain hole basic and shaft basic system.(4 marks)

### Solve any one question from Q3 and Q4

3 (a) Explain the method of measuring effective diameter using three wires with neat sketch.(6 marks) 3 (b) State the Taylor's principal for designing the limit gauges.(4 marks) 4 (a) Explain Tool Maker's microscope and their application.(6 marks) 4 (b) Write the type of errors in gear metrology.(4 marks)

### Solve any one question from Q5 and Q6

5 (a) What points were given by Deming to improve quality.(6 marks) 5 (b) Explain Juran's trilogy approach.(6 marks) 5 (c) Explain cost of quality.(6 marks)

### Explain the following:

6 (a) Seven Quality New tools.(6 marks) 6 (b) Quality circle.(6 marks) 6 (c) Characteristics of quality.(6 marks)

### Solve any one question from Q7 and Q8

7 (a) Explain with OC curve and state Producer's risk, Consumer's risk, AOQL and LTPD.(8 marks) 7 (b) The following data shows number of defectives in inspection of 10 lots of 100 samples sizes each for connecting rods. Determine the control limits and the revision made in case the chart is 'out of limit'.

 Lot No. 1 2 3 4 5 6 7 8 9 10 Defection 9 5 4 7 6 11 5 2 4 7
(8 marks) 8 (a) Control chart for X&R are maintained for control of an important dimension of a component the subgroup and value of ∑X & ∑R after 25 sub group are found to be 614.8 & 120 respectively compute the value of 3σ limit for X- chart R=2.32 σ.(8 marks) 8 (b) Define AOQL and AOQ for the given data calculate sample size and AOQ for single sampling plan.
i) Probability of acceptance for 0.3% defectives in a lot is 0.558
ii) Lot size N=10000 units
iii) np'=1.5.
iv) Detectives found in the sample are not to be replaced.
(8 marks)

### Solve any one question from Q9 and Q10

9 (a) Explain quality function development and its benefits.(5 marks) 9 (b) Explain JIT concept in industry.(5 marks) 9 (c) Explain KAIZEN and KANBAN system.(5 marks)