Practice Test Geeks(CMRT) Certified Maintenance and Reliability Technician Practice Test
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Equipment Reliability Flashcards

7 cards from real CMRT 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 Reliability flashcards as text

  1. A pump has an MTBF of 2,000 hours and an MTTR of 8 hours. What is its inherent availability?

    Answer: 99.6%

    Inherent availability = MTBF / (MTBF + MTTR) = 2000 / 2008 ≈ 99.6%.

  2. Which reliability metric measures the average time a system operates before failing?

    Answer: MTBF

    MTBF (Mean Time Between Failures) measures average operating time between consecutive failures for repairable systems.

  3. If a component has a constant failure rate of 0.0005 failures/hour, what is its reliability after 1,000 hours?

    Answer: 60.7%

    R(t) = e^(-λt) = e^(-0.0005 × 1000) = e^(-0.5) ≈ 0.607 or 60.7%.

  4. A system has three components in series with reliabilities of 0.95, 0.90, and 0.98. What is the system reliability?

    Answer: 0.837

    Series system reliability = R1 × R2 × R3 = 0.95 × 0.90 × 0.98 ≈ 0.837.

  5. What does the 'bathtub curve' infant mortality region indicate about equipment failure?

    Answer: Failures decrease over time due to early defect elimination

    The infant mortality region shows a decreasing failure rate as weak components fail early and are removed from service.

  6. Which measure describes the probability that a failed system will be restored to operating condition within a specified time?

    Answer: Maintainability

    Maintainability is the probability that a failed item will be restored to a specified condition within a given time when maintenance is performed.

  7. When two identical components are placed in active parallel redundancy with individual reliability of 0.80, what is the system reliability?

    Answer: 0.96

    Parallel redundancy: R_system = 1 – (1–0.80)(1–0.80) = 1 – 0.04 = 0.96.