Practice Test Geeks(CRE) Certified Reliability Engineer Practice Test
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Equipment and Tools Knowledge Flashcards

7 cards from real CRE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Equipment and Tools Knowledge flashcards as text

  1. Which condition monitoring technique is MOST effective for detecting early-stage bearing defects in rotating machinery?

    Answer: Vibration spectrum analysis

    Vibration spectrum analysis can detect characteristic bearing defect frequencies (BPFI, BPFO, BSF, FTF) long before failure becomes visible or thermal.

  2. A laser shaft alignment tool reports an angular misalignment of 0.8 mrad. This value primarily affects which failure mode?

    Answer: Coupling and bearing wear from bending loads

    Angular misalignment introduces cyclic bending loads on couplings and bearings, accelerating wear and fatigue damage.

  3. When using an ultrasonic thickness gauge, the measured value is lower than the nominal wall thickness. What is the MOST likely cause?

    Answer: Internal corrosion or erosion reducing wall thickness

    Internal corrosion or erosion removes material from the inner surface, reducing the measured wall thickness without visible external damage.

  4. In oil analysis, a high ISO cleanliness code (e.g., 22/20/17) compared to the target (16/14/11) indicates:

    Answer: Excessive particulate contamination requiring filtration or oil change

    A higher ISO cleanliness code means more particles per milliliter, signaling contamination that can accelerate bearing and gear wear.

  5. A motor current signature analysis (MCSA) tool detects sidebands at frequencies of line frequency ± 2sf. What does this pattern indicate?

    Answer: Broken rotor bars

    Broken rotor bars produce characteristic sidebands at f_line ± 2sf (where s = slip, f = supply frequency) in the motor current spectrum.

  6. Which NDT method is BEST suited for detecting surface and near-surface cracks in ferromagnetic components without removing coatings?

    Answer: Eddy current testing (ECT)

    Eddy current testing can detect near-surface flaws through non-conductive coatings without requiring their removal.

  7. A vibration analyzer shows a dominant peak at exactly 1× running speed that increases significantly when the rotor speed changes. The MOST likely cause is:

    Answer: Rotor imbalance

    Rotor imbalance produces a dominant 1× running speed vibration whose amplitude is proportional to the square of speed.