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. A reliability engineer receives a vibration report showing sub-synchronous vibration at approximately 0.43× running speed in a journal bearing machine. This pattern is MOST consistent with:

    Answer: Oil whirl instability

    Oil whirl in journal bearings typically occurs at approximately 40–48% of running speed (0.43–0.48×) due to the average oil film velocity in the bearing clearance.

  2. Which tool is used to determine the natural frequency of a piping system to assess risk of acoustic resonance with pump pulsations?

    Answer: Finite element analysis (FEA) software or modal testing

    FEA software or experimental modal testing (impact hammer + accelerometer) identifies the mechanical natural frequencies of piping to compare with excitation frequencies.

  3. A thermographic camera with a temperature sensitivity (NETD) of 0.05°C is MOST valuable for:

    Answer: Detecting small, early-stage thermal anomalies in electrical equipment

    High thermal sensitivity (low NETD) allows detection of subtle temperature differences indicative of early-stage electrical faults before they become severe.

  4. An X-ray fluorescence (XRF) analyzer is used in oil analysis to detect which type of contamination?

    Answer: Wear metal elemental composition (iron, copper, lead, etc.)

    XRF and ICP spectrometry identify and quantify wear metal elements in oil, helping diagnose which components are degrading based on their elemental signature.

  5. During a pump reliability improvement project, a team installs real-time flow and pressure transmitters. The PRIMARY reliability benefit is:

    Answer: Enabling detection of off-BEP (best efficiency point) operation that causes cavitation and wear

    Operating a pump away from its best efficiency point increases internal recirculation, radial loads, and cavitation risk, all of which reduce bearing and seal life.

  6. A portable hardness tester using the Leeb rebound method is suitable for which field application?

    Answer: Estimating tensile strength and verifying material grade on installed equipment

    Leeb rebound hardness correlates with tensile strength and allows field verification of material grade on large, installed components that cannot be brought to a lab.

  7. When a reliability engineer specifies a MTTF of 50,000 hours for a new sensor, and 200 units are deployed for 1,000 hours, approximately how many failures are expected (assuming constant hazard rate)?

    Answer: 4 failures

    Expected failures = (200 units × 1,000 hours) / 50,000 hours MTTF = 200,000 / 50,000 = 4 failures.