CQT Free Practice Questions (Review Mode)

Free sample questions

1 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 receiving inspector at an aerospace fastener distributor measures the head height of 200 bolts from an incoming lot and plots the results below. The drawing requires a head height of $4.00$ mm to $4.40$ mm.
   
   Which conclusion best fits this shape?

   

   • A.Two machines running at different settings were mixed into one lot
   • B.The gauge used has too coarse a resolution for this tolerance
   • C.The supplier has screened the lot, removing the bolts below the lower limit✓ Correct answer
   • D.The process is centred, with room to spare on both sides of the specification

   Explanation

   The picture shows a distribution with a straight vertical wall on its left side, exactly at the lower specification limit, and a tall bar sitting hard against that wall. A process does not produce that shape on its own. Natural variation gives a tail that fades away gradually on both sides. A wall appears when parts on one side of a limit have been taken out after they were made, which is screening or sorting.
   
   The two machine explanation is the primary foil, and it is the right answer for a different picture: mixing two settings gives two peaks with a dip between them, not one peak with a cliff. A centred capable process would leave clear space between the data and both limits. A coarse gauge gives a comb pattern, with readings piling on a few values and gaps between them, which is also not what is shown.
   
   [IMAGE REQUIRED: Histogram. X axis labelled Head height (mm), running from 3.90 to 4.50 with bar intervals of 0.05 and tick labels at 3.90, 4.00, 4.10, 4.20, 4.30, 4.40 and 4.50. Y axis labelled Number of bolts, 0 to 60. Two vertical dashed reference lines, one at 4.00 labelled LSL and one at 4.40 labelled USL. No bars at all below 4.00. The bar from 4.00 to 4.05 is the tallest at about 55 bolts, forming a straight vertical cliff on its left edge at the 4.00 line. Bars then fall away smoothly to the right: about 42, 34, 26, 19, 12, 7 and 3 bolts, with the last bar ending at 4.40 and nothing beyond it. The shape has a single peak against the left limit and one smooth tail to the right. The feature the question turns on is the abrupt vertical cut at the lower specification limit with no data below it.]

   Reference: CQT BoK I

Practise CQT the way the exam actually asks it

• 25 exam-style CQT questions
• Full explanation for every question
• Mobile friendly, no install required
• Instant feedback as you answer

Questions about this practice test

Related CQT practice tests

• CQT Full 150 Randomly Drawn Questions Mock Exam (240 Minutes)100 practice questionsExam · 240 minView quiz→
• CQT Free Mock Exam (60 Minutes)25 practice questionsExam · 60 minFreeView quiz→
• CQT - 1. Quality Concepts and Tools25 practice questionsReviewView quiz→
• CQT - 2. Statistical Techniques25 practice questionsReviewView quiz→