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EndsemMay 20252019 patternBE Mech

Quality & Reliability Engineering (QRE) SPPU Endsem Question Paper May 2025

All 8 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.

Open the PDFMost repeated QRE questions
Subject code
402050A
Pattern
2019 pattern
Exam
Endsem
Session
May 2025
Max. marks
70
Time
2½ Hours
Semester
VIII
Paper code
[6404]-218

Printed for: B.E. (Mechanical Engineering)

Instructions to the candidates

  1. Solve Q1 or Q2, Q3 or Q4, Q5 or Q6, Q7 or Q8.
  2. Draw suitable neat diagrams, whenever necessary.
  3. Figure to the right indicate full marks.
  4. Assume suitable data if required.

Questions

  1. Q1

    1. a)

      Differentiate between Quality & Reliability.

      [6]
    2. b)

      The failure of ten vehicle brakes are observed to be 43500, 52000, 72000, 84500, 93500, 101000, 111500, 116000 & 123500 miles of operations. Plot the probability density, probability distribution, reliability and the hazard function of the failure time to brakes.

      Also asked:May 2023

      [12]

  2. Q2

    1. a)

      Define failure with it’s classification and modes of failure in detail.

      [9]
    2. b)

      Explain in detail the term Probability Density Function (PDF) & Cumulative Distribution Function (CDF).

      Also asked:May 2024

      [9]

  3. Q3

    1. a)

      Explain with illustration reliability analysis of series, parallel & mixed configuration systems.

      Also asked:May 2024

      [8]
    2. b)

      The three main units connected in series together make an assembly of machine which requires reliability of 0.65. The individual reliabilities of units are 0.70, 0.80 & 0.90 respectively. Explain and find how the reliability of machine should be apportioned among these units with minimum effort technique. 2

      Also asked:May 2024

      [9]

  4. Q4

    1. a)

      Explain in detail about Cold, Warm & Hot Standby Redundancy.

      Also asked:May 2024

      [8]
    2. b)

      A system have three elements 1, 2 and 3 connected in series with their failure rates of 1  = 0.006, 2  = 0.004, 3  = 0.001 per hour respectively Assuming mission time of 20 hours and system reliability of 0.92, find the reliability of each subsystem to achieve the desired reliability goal.

      Also asked:May 2024

      [9]

  5. Q5

    1. a)

      What is fault tree analysis (FTA)? Give four basic symbols used in FTA. Explain four points of differences between FTA and failure mode and effects analysis (FMEA) approach.

      [9]
    2. b)

      Figure shows three valves A, B and C, a pump (P), a pipeline and a tank to collect water pumped from the pond. Construct the fault tree corresponding to the top event no flow of water into the tank.

      [9]

  6. Q6

    1. a)

      What is FMECA? Give the procedure of FMECA. State importance of RPN in FMECA with example.

      Also asked:Nov 2025 ·Nov 2023 ·May 2023

      [9]
    2. b)

      Draw and explain any five symbols used in fault tree construction. 3

      [9]

  7. Q7

    1. a)

      Write a note on : i) Markov model ii) MTBF iii) Reliability Centered Maintenance (RCM)

      [9]
    2. b)

      Define preventive, predictive and corrective types of maintenance. State the benefits of each type of maintenance with suitable examples.

      [8]

  8. Q8

    1. a)

      Define maintainability and state the factors which affect maintainability. Also, compare the inherent, achieved and operational availability.

      [8]
    2. b)

      A beam is subjected to mean stress 180 N/mm 2 and standard deviation 20 N/mm 2 the mean strength of beam material is 280 N/mm 2 and standard deviation 40 N/mm 2 . Determine: i) Reliability of the Beam ii) Minimum Factor of Safety iii) Average factor of safety 

      Also asked:May 2023

      [9]