GATE Quality and Reliability: Reliability and Maintenance – Previous Year Questions
11 GATE previous year questions on Reliability and Maintenance (Quality and Reliability, Production and Industrial Engineering) with answers and explanations, from every paper.
- GATE 2021 PI Q11 – A product has exponential time to failure with constant failure rate 0.00006 per hour. Find reliability after 4000 operating hours.
- GATE 2021 PI Q38 – Identical independent components form a parallel system of reliability 0.97. Each component reliability is 0.68. Find the number of components; round…
- GATE 2022 PI Q32 – A machine has two motors but needs only one to function. Their reliabilities are 0.90 and 0.70. Find machine reliability to two decimals.
- GATE 2022 PI Q58 – A factory uses 100 bulbs and individually replaces failures at ₹300 each. Cumulative failure probabilities at 1,2,3,4,5 months are…
- GATE 2023 PI Q52 – The shown system has seven components with reliabilities R A = 0.96, R B = 0.92, R C = 0.94, R D = 0.89, R E = 0.95, R F = 0.88 and R G = 0.90. Find…
- GATE 2023 PI Q54 – A system has 10 essential components, each with exponential failure rate 0.04 per 4000 hours. Find system mean time to failure in hours (integer).
- GATE 2024 PI Q26 – Which statement is NOT true about Total Productive Maintenance (TPM)?
- GATE 2024 PI Q60 – A repairable machine operates 2400 hours in a year and breaks down eight times. Mean repair time including waiting is 20 hours. If it were reduced to…
- GATE 2025 PI Q17 – An aircraft has two engines, each of reliability R. It crashes only if both stop. Find reliability against a crash.
- GATE 2025 PI Q63 – A machine costs ₹70000. End-of-year resale values for years 1–5 are ₹40000,30000,25000,22000,20000; annual maintenance costs are…
- GATE 2026 PI Q41 – The failure-rate function is r(t)=f(t)/(1-F(t)), where f is the failure-time density and F(t)=1-e-atb, a > 0, b > 0. Find r(t).