CQI Free Mock Exam (60 Minutes)

Free sample questions

3 questions from this set, shown in full with the correct answer and the reasoning behind it. Read them as a study resource.

1. Q1.Three holes are checked with a GO and NO-GO plug gauge set.
   
   $$\begin{array}{c|c|c} \textbf{Hole} & \textbf{GO member} & \textbf{NO-GO member} \\ \hline 1 & \text{Enters} & \text{Enters} \\ 2 & \text{Enters} & \text{Does not enter} \\ 3 & \text{Does not enter} & \text{Does not enter} \end{array}$$
   
   Which hole is oversize?

   • A.Hole 3
   • B.No hole is oversize
   • C.Hole 1✓ Correct answer
   • D.Hole 2

   Explanation

   The GO member represents the smallest acceptable hole and must enter. The NO-GO member represents the largest acceptable hole and must not enter. Hole 1 accepts both members, so it is larger than the upper limit and is oversize. Hole 2 gives the correct result and passes. Hole 3 rejects the GO member, which means it is undersize rather than oversize.

   Reference: CQI BoK II

2. Q2.The drawing detail below shows a machined block.
   
   What does the callout require?

   

   • A.The right face must be parallel to the bottom face within $0.08$ mm
   • B.The block height must be within $0.08$ mm of its stated value
   • C.The right face must be square to the bottom face within $0.08$ mm✓ Correct answer
   • D.The bottom face must be flat within $0.08$ mm

   Explanation

   The upright T is the perpendicularity symbol, the value is the width of the tolerance zone, and the letter A names the datum the surface must be square to. The triangle symbol on the bottom face identifies that surface as datum feature A. Reading a feature control frame is always the same three steps: what is controlled, how much, and with respect to what.

   Reference: CQI BoK III

3. Q3.A team builds a Pareto analysis of customer complaints.
   
   $$\begin{array}{l|c|c} \textbf{Complaint} & \textbf{Count} & \textbf{Cumulative percent} \\ \hline \text{Late delivery} & 90 & 45 \\ \text{Wrong quantity} & 54 & 72 \\ \text{Damaged packing} & 30 & 87 \\ \text{Invoice error} & 26 & 100 \end{array}$$
   
   How many categories must be addressed to cover at least 80 percent of the complaints?

   • A.Two
   • B.Three✓ Correct answer
   • C.Four
   • D.One

   Explanation

   Read down the cumulative column until it reaches 80 percent. Two categories reach 72 percent, which is short, and three reach 87 percent, which clears the mark. So the first three complaints are the vital few. Stopping at the two largest bars because they look dominant would leave more than a quarter of the complaints untouched.

   Reference: CQI BoK IV

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