LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
M.Sc. DEGREE EXAMINATION – STATISTICS
FOURTH SEMESTER – APRIL 2012
ST 4810 / 4806 – STATISTICAL PROCESS CONTROL
Date : 18-04-2012 Dept. No. Max. : 100 Marks
Time : 1:00 – 4:00
Section – A
Answer all the questions: ( 10 x 2 =20)
- Give a typical application of Acceptance Sampling
- What is lot sentencing?
- Name the two control charts that detect small process shifts.
- In what steps of DMAIC is process capability analysis used and name a technique used for the same?
- When do we go for Attributes Control Chart?
- When do we go for ?
- What are the tools used in Analyze step of DMAIC?
- What are USL and LSL?
- What are the three components of Juran Trilogy?
- Discuss the major disadvantages of Shewart Control Chart.
Section – B
Answer any five questions: ( 5 x 8 =40)
- Elucidate on Single Sampling plans for attributes.
- What is the Variable Width Control Limit approach with respect to a p chart?
- Describe the construction of c chart when we have 2 cases
- a) Standards given
- b) Standards not given.
- Explain OC Curve. Why do we need it?
- What are the different types of Control Chart?
- Give a note on the Define Step of the DMAIC
- Explain in detail SIPOC diagram.
- Define the notations ,Cp and p with respect to process capability. Diagrammatically represent the scenarios wherein Cp=1, Cp<1 and Cp>1.
Section – C
Answer any two questions: ( 2 x 20 =40)
- a)What is Acceptance Sampling and what are the three important aspects of it?
b)Discuss the single, double and multiple Sampling Plan in detail.
- a)Describe the construction of CUSUM charts.
b)Give a brief description of the tools used in different stages of DMAIC
- a)Discuss the three statistical methods for Quality Control and Improvement.
b)What are the three approaches followed in the construction of p chart when we have a variable sample size?
- a)Describe briefly the Phase 1 and Phase 2 of Control chart application
b)Explain the role of Design of Experiment in SPC.