CQT - 1. Quality Concepts and Tools

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.An inspector checks four characteristics on a machined housing. The drawing requirement and the measured value for each are shown.
   
   $$\begin{array}{l|c|c} \hline \textbf{Characteristic} & \textbf{Drawing requirement (mm)} & \textbf{Measured (mm)} \\ \hline \text{Bore diameter} & 25.00 \pm 0.05 & 25.03 \\ \text{Overall length} & 80.00 \pm 0.10 & 80.14 \\ \text{Flange thickness} & 6.00 \pm 0.08 & 5.95 \\ \text{Hole spacing} & 40.00 \pm 0.15 & 40.09 \\ \hline \end{array}$$
   
   Which characteristic falls outside its specification?

   • A.Bore diameter
   • B.Overall length✓ Correct answer
   • C.Flange thickness
   • D.Hole spacing

   Explanation

   A bilateral tolerance gives two limits around the nominal value:
   
   $$\text{limits} = \text{nominal} \pm \text{tolerance}$$
   
   For the overall length:
   
   $$80.00 \pm 0.10 = 79.90 \text{ to } 80.10$$
   
   The measured 80.14 mm sits above the upper limit, so this characteristic does not conform. Every other reading falls inside its own band: the bore at 25.03 against 24.95 to 25.05, the flange at 5.95 against 5.92 to 6.08, and the hole spacing at 40.09 against 39.85 to 40.15.
   
   The flange thickness is the option most often picked by mistake, because 5.95 is below its nominal value. Being below nominal is not the test. Being outside the limits is.

   Reference: CQT BoK I

2. Q2.On a process flowchart, which symbol shape marks a point where the flow splits according to a yes or no answer?

   • A.Rectangle
   • B.Oval
   • C.Parallelogram
   • D.Diamond✓ Correct answer

   Explanation

   A diamond is the decision symbol. Two or more paths leave it, one for each possible answer, and each path is labelled.
   
   The rectangle is the nearest wrong answer, because it is the shape used most often on a flowchart. A rectangle is an ordinary process step: something is done, and the flow carries on in one direction. The oval marks the start or the end of the chart, and the parallelogram marks data going in or coming out.

   

   Reference: CQT BoK I

3. Q3.A team reviews the cause and effect diagram shown below before it starts collecting data.
   
   Which entry has been placed on the wrong branch?

   

   • A.New operator not trained, on the Machine branch✓ Correct answer
   • B.Booth humidity high, on the Environment branch
   • C.Paint viscosity varies, on the Material branch
   • D.Film thickness gauge reads high, on the Measurement branch

   Explanation

   Each bone of the diagram holds causes of one kind. Training is something about the person doing the job, so it belongs on the People bone. The Machine bone is for the equipment itself, such as the worn nozzle already listed there.
   
   The gauge entry is the nearest wrong answer, because a gauge is a piece of equipment and looks like a machine cause. It is placed correctly. Measurement covers everything about how the result is measured, including the instruments used, so a gauge that reads high belongs there.

   Reference: CQT BoK I

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