CCQM Full 150 Randomly Drawn Questions Mock Exam (240 Minutes)

Free sample questions

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

1. Q1.A gauge study on a coating thickness meter returns the output below, with total study variation of $0.72$ mm.
   
   $$\begin{array}{l|c} \hline \textbf{Source} & \textbf{Standard deviation} \\ \hline \text{Repeatability (equipment)} & 0.20 \\ \text{Reproducibility (operator)} & 0.15 \\ \hline \end{array}$$
   
   How should this measurement system be judged?

   • A.Marginal, since gauge variation is about $24\%$ of study variation
   • B.Acceptable, since gauge variation is below $10\%$ of study variation
   • C.Unacceptable, since gauge variation is about $35\%$ of study variation✓ Correct answer
   • D.Unacceptable, since gauge variation is about $49\%$ of study variation

   Explanation

   The two components combine through their variances:
   
   $$\sigma_{R\&R} = \sqrt{\sigma_{EV}^2 + \sigma_{AV}^2} = \sqrt{0.20^2 + 0.15^2} = 0.25$$
   
   The percentage of study variation follows:
   
   $$\%R\&R = \frac{0.25}{0.72} = 34.7\%$$
   
   Above $30\%$ the system is normally rejected, so it is unacceptable. The $49\%$ option is the trap, produced by adding the two standard deviations instead of combining their variances.

   Reference: CCQM BoK II

2. Q2.The control chart below covers the first twenty subgroups of a concrete strength monitoring programme.
   
   What is the correct interpretation?

   

   • A.The process is in control, since no point falls outside the control limits
   • B.A trend is present, so the assignable cause should be investigated now✓ Correct answer
   • C.The process is out of control, since points exceed the upper control limit
   • D.The control limits should be recalculated to reflect the recent subgroups

   Explanation

   A run of nine consecutive rising points is a recognised out-of-control pattern in its own right, so the cause should be found before a point breaches a limit. The in-control reading is the primary foil: it applies the single most familiar rule correctly, but the limit rule is only one of several, and relying on it alone discards the early warning the trend provides.

   Reference: CCQM BoK II

3. Q3.Mill certificates for four heats of reinforcing bar are summarised below. The specification requires a minimum yield of $60$ ksi, a minimum tensile of $90$ ksi, a minimum elongation of $9\%$, and an actual tensile to actual yield ratio of at least $1.25$.
   
   $$\begin{array}{c|c|c|c} \hline \textbf{Heat} & \textbf{Yield} & \textbf{Tensile} & \textbf{Elongation} \\ \hline A & 68 & 96 & 12\% \\ B & 71 & 92 & 10\% \\ C & 74 & 91 & 11\% \\ D & 66 & 95 & 9\% \\ \hline \end{array}$$
   
   Which heat fails to conform, and why?

   • A.Heat C, because its tensile to yield ratio is below $1.25$✓ Correct answer
   • B.Heat C, because its yield strength exceeds the stated minimum
   • C.Heat B, because its tensile to yield ratio is below $1.25$
   • D.Heat D, because its elongation sits at the stated minimum

   Explanation

   The ratio criterion compares the two measured strengths of the same heat:
   
   $$r = \frac{f_u}{f_y}$$
   
   Substituting each heat:
   
   $$r_A = \frac{96}{68} = 1.41 \qquad r_B = \frac{92}{71} = 1.30 \qquad r_C = \frac{91}{74} = 1.23 \qquad r_D = \frac{95}{66} = 1.44$$
   
   Only Heat C falls below $1.25$, and it does so while passing both absolute strength limits, which is why reading the strength columns on their own misses it. Heat D is the primary foil: its elongation of $9\%$ is the lowest in the table, but meeting a stated minimum exactly is conformance, not failure.

   Reference: CCQM BoK V

4. Q4.The monthly quality report carries the inspection data below.
   
   $$\begin{array}{c|c|c} \hline \textbf{Month} & \textbf{Defects} & \textbf{Items inspected} \\ \hline 1 & 42 & 350 \\ 2 & 38 & 280 \\ 3 & 31 & 310 \\ 4 & 27 & 180 \\ \hline \end{array}$$
   
   Which month shows the worst quality performance?

   • A.Month 3
   • B.Month 2
   • C.Month 4✓ Correct answer
   • D.Month 1

   Explanation

   Performance across periods of unequal workload must be expressed as a rate rather than a count:
   
   $$d = \frac{\text{defects}}{\text{items inspected}} \times 100$$
   
   Substituting each month:
   
   $$d_1 = \frac{42}{350}(100) = 12.0 \qquad d_2 = \frac{38}{280}(100) = 13.6$$
   
   $$d_3 = \frac{31}{310}(100) = 10.0 \qquad d_4 = \frac{27}{180}(100) = 15.0$$
   
   Month 4 is worst at $15.0$ defects per hundred items. Month 1 is the trap: it has the largest raw count, but it also has the largest inspection volume, so its rate is the second lowest of the four.

   Reference: CCQM BoK V

5. Q5.Activities have been mapped to the five level commissioning framework, and one entry is placed in the wrong level.
   
   $$\begin{array}{l|c} \hline \textbf{Activity} & \textbf{Level} \\ \hline \text{Chiller works performance test before shipment} & 4 \\ \text{Valve actuator receipt verification} & 2 \\ \text{Ductwork installation verification} & 3 \\ \text{Fire alarm to air handling interface test} & 5 \\ \hline \end{array}$$
   
   Which entry is placed in the wrong level?

   • A.Valve actuator receipt verification
   • B.Chiller works performance test before shipment✓ Correct answer
   • C.Ductwork installation verification
   • D.Fire alarm to air handling interface test

   Explanation

   A performance test carried out at the manufacturer's works before shipment is the factory acceptance test, which is level 1, not the level 4 verification of installed equipment in operation. The fire alarm interface entry is the primary foil: it also involves operating equipment and could be mistaken for level 4, but it exercises two systems together, which is precisely what level 5 integrated system testing means.

   Reference: CCQM BoK V

Practise CCQM the way the exam actually asks it

• 150 exam-style CCQM questions randomly drawn from a pool
• Full explanation for every question (on completing the exam)
• Mobile friendly, no install required
• Each time you take this quiz, it draws random questions from the database

Questions about this practice test

Related CCQM practice tests

• CCQM Free Practice Questions (Review Mode)25 practice questionsReviewEasyFreeView quiz→
• CCQM Free Mock Exam (60 Minutes)25 practice questionsExam · 60 minMediumFreeView quiz→
• CCQM - 1. Delivery Methods and Contract Types25 practice questionsReviewMediumView quiz→
• CCQM - 2. Contractual Requirements25 practice questionsReviewMediumView quiz→