Deck 6: Control Charts for Variables

Question 1

Those causes of variation which are small in magnitude are:

A) special causes
B) assignable causes
C) chance causes
D) fluctuating causes

Answer 1

C

Question 2

Which of the following subgroup sizes for an X and R chart would not be used?

A) 1
B) 4
C) 5
D) 2

Answer 2

A

Question 3

If only one measurement can be taken at a time, the chart to use is called:

A) moving average
B) trend
C) median
D) sun

Answer 3

A

Question 4

A user friendly chart for the operator to use is called:

A) moving average
B) median
C) trend
D) all of the above

Question 5

The process spread is the same as the:

A) tolerance
B) quality spread
C) index
D) process capability

Question 6

Given the following range readings for 25 subgroups of size four, determine the process capability.

Question 7

Which of the following is the name of an out-of- control pattern?

A) assignable
B) causal
C) shift or jump
D) a and b

Question 8

Which of the following subgroup sizes of an X and R chart would most likely be used for costly testing?

A) 6
B) 4
C) 5
D) 2

Question 9

When using the X chart the central limit theorem is the basis for a sample size of:

A) 2
B) 3
C) 4
D) 5

Question 10

An s chart might be used as a measure of dispersion rather than an R chart because it is:

A) easier to understand
B) more sensitive to variations
C) more accurate
D) b and c

Question 11

The specifications for an electronic device are 3.00 ± 0.10 amps. If the standard deviation is 0.02, what is the capability index?

Question 12

Those causes of variation which are large in magnitude and are not part of the normal variation are:

A) stable causes
B) chance causes
C) assignable causes
D) fluctuating causes

Question 13

Using the data below, determine the trial central line and trial control limits for the X-bar chart. Subgroup size is 5. For the R chart, the trial central line is 0.11, the UCL is 0.23, and LCL is 0. Note not all of the subgroups are included in the data;however, the sums are correct.

Question 14

An R chart is not accurate above a sample size of:

A) 5
B) 7
C) 10
D) 15

Question 15

Which of the following is a source of variation:

A) materials
B) piece-to-piece
C) chance
D) none of these

Question 16

The numerator of the capability index equation is the:

A) tolerance
B) capability ratio
C) process spread
D) none of the above

Question 17

Of the following, the capability index that is most desirable is:

A) 1.00
B) 1.50
C) 0.75
D) 0.30