Name: Date: Examination - SPC Total Allowed Time :1.5 Hours 1. It was found that in a lot of 500 Air Conditioners , there were 7 brazing leakage cases found. If there are 45 brazing joints in each air conditioner, find out DPU, DPO & Yield of Brazing process. 2. Write the name of all type of control chart & for any two write the appropriate application of use. 3. At X-Bar Total = 135.67 & R Total = 21.6, What would be the value of X-Bar UCL Given that Total Subgroups are 20 & Subgroup size is 5 4. a) b) Conduct the X-Bar R Chart for the following data & answer the below From the R Chart, find out the UCL R Value At CL 18, what would be the UCL X-Bar Value 1 2 3 4 20.1 19.8 19.5 20.4 20.1 20.1 19.8 20.3 19.4 19.5 20.1 20.4 20.5 19.5 20.3 19.9 21.2 20.3 20.4 19.7 5. Calculate the standard deviation for the data points given in the below 10 data 1 2 20.1 19.8 19.5 20.4 20.1 20.1 19.8 20.3 19.4 19.5 11 Refer to the table given . calculate the CL. it is not necessay that process should be stable Q10. 1) If the subgroup size is 5 .SPC Q6. LCL UCL for an appropriate control chart. 4) To stabilize the condition.Name: Date: Examination . Find out which control chart should be used when given no. 1 2 3 4 5 6 7 8 9 10 Number of Errors 21 24 16 12 15 5 28 20 31 25 . Use C Chart when the subgroup size varies e) None of these Q7. of defects per unit sampled in each subgroup. Sampling No. b) Stability means the average and range are located within control limits c) If there are any pt outside the control limits then we must accept that the process is not stable d) To estimate the process. Which type of the following charts can be used for attribute data a) n Chart b) X-Bar R chart c) U Chart d) X-Bar S Chart Q8. Total Allowed Time :1. it can be considered as unstable condition. sampling size/ subgroup size is 5. all the points in control chart shall be within ±1σ. Find out 2 wrong answers. Find out which is the wrong explaination for the concept of process stable a) We can conclude the process is stable if the process output is consistent with common cause. 2) The UCL & LCL can be considered as specification limit 3) If 2 points among 3 consecutive ones are out of 3sigma . The followings are explanation of continous control chart. Xbar & R control chart will be better than I&M R control chart. of defects in each subgroup.5 Hours Which is the wrong explaination of the following a) U Chart charts the no. Q. Use U Chart when the subgroup size varies b) P Chart charts the proportion of defectives in each subgroup c) NP Chart charts the number of defectives in each subgroup d) C Chart charts the no. of defectives & sample size is constant a) p Chart b) C Chart c) np Chart d) U Chart Q9. Name: Date: Examination .5 Hours .SPC Total Allowed Time :1.