Senior Reliability Engineer

Senior Reliability Engineer Interview Questions and Answers

Updated 10 Nov 2024

Q1. How the auto transfer system works in high voltage switchgears

Ans.

Auto transfer system in high voltage switchgears automatically transfers power source in case of failure

  • Auto transfer system detects power source failure

  • Automatically switches to backup power source

  • Ensures continuous power supply to critical loads

  • Commonly used in data centers, hospitals, and industrial facilities

Q2. What are all the failure modes of a electrical motors

Ans.

Failure modes of electrical motors include overheating, bearing failure, winding insulation breakdown, and rotor imbalance.

  • Overheating due to excessive current or poor ventilation

  • Bearing failure from lack of lubrication or misalignment

  • Winding insulation breakdown from voltage spikes or moisture ingress

  • Rotor imbalance causing vibration and eventual failure

Q3. What is RPN and how to calculate RPN?

Ans.

RPN stands for Risk Priority Number and is used to prioritize risks based on severity, occurrence, and detection.

  • RPN is calculated by multiplying the severity, occurrence, and detection scores of a risk.

  • The severity, occurrence, and detection scores are typically rated on a scale of 1-10.

  • The higher the RPN, the higher the priority of the risk.

  • RPN can be used to prioritize which risks to address first.

  • Example: A risk with a severity score of 8, occurrence score of 5, and detec...read more

Q4. What is Bath Tub Curve?

Ans.

Bath Tub Curve is a graphical representation of failure rate of a product over its lifetime.

  • It shows three phases of product life: early failures, random failures, and wear-out failures.

  • Early failures occur due to manufacturing defects or poor quality control.

  • Random failures occur due to normal wear and tear.

  • Wear-out failures occur due to aging of the product.

  • Examples include electronic devices, automobiles, and aircraft components.

  • Reliability engineers use this curve to desi...read more

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