1. In bell shape Histogram, UCL – LCL is known as ___________ ?

Ans : Process Capability

2. What is the formula for calculating UCL & LCL for X-R chart.

Ans.: UCLx = X + A2R; LCLx = X – A2R;

33. Which tool / technique is called as on-line quality control method ?

Ans : Control Chart

34. In X-R chart, the value of A2R is 1.8. Calculate the value of sigma i.e. standard deviation ?

Ans. : 0.6

35. Calculate the value of LCL of a process if the value A2 R = 3.3 , value of A2 = 0.577 , and X = 15.2

Ans.: 11.9

36. If average defective toys are 6.2 per lot of 100 toys . What will be the upper control limit for defective toys ?

Ans.: 13.43

37. In X-R chart for size of group is 5, the value of A2 = 0.577, Dr = 2.115. If the average range of 20 sets of reading is 3.0, what will be the value of standard deviation of the process ?

Ans.: 0.577

38. In X-R chart, the value of X = 72.972 gms. No. of observations are 25, average moving range R =3.384, value of d2 = 1.128, what will be the value of UCL ?

Ans.: 81.972

39. In X-R chart, for the sub group of 5, what will be the value of LCL, if X = 35.5 gms. Value of sigma is 1.5, and the value of A2 = 0.577

Ans : 31

40. Which graphical device that aids in process control on-line ?

Ans.: Control Chart

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