Quality & Reliability Engineering (QRE) SPPU Endsem Question Paper Nov 2023
All 8 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.
- Subject code
- 402050A
- Pattern
- 2019 pattern
- Exam
- Endsem
- Session
- Nov 2023
- Max. marks
- 70
- Time
- 2½ Hours
- Semester
- VIII
- Paper code
- [6181]-246
Printed for: B.E. (Mechanical)
Instructions to the candidates
- Draw suitable neat diagrams, wherever necessary.
- Figure to the right indicate full marks.
- Assume suitable data if required.
Questions
Q1
- a)[9]
Explain the following (Any 3) : i) Reliability ii) Hazard Rate iii) Mean Time to failure (MTTF) iv) Probability density functions of failure
Also asked:Nov 2024
- b)[8]
State the importance and role of the reliability function in an organization. Distinguish between Quality and Reliability of a product.
OR- a)
Q2
- a)[8]
Explain following probability distributions (Any 2) : i) Binomial distribution ii) Normal distribution iii) Weibull distribution
- b)[4]
A cinema house gets electric power from a generator run by a diesel engine. On a given day, the probability that the generator is down (Event A) is 0.025 and the probability that the diesel engine is down (Event B) is 0.04, what the probability that the cinema house will have power on any given day? Assume that the occurrence of event A & B are independent of each other.
- c)[5]
Draw & explain a specimen ‘Bath Tub Curve’.
Also asked:May 2024
- a)
Q3
- a)[8]
A system consists of three components 1, 2 and 3 having failure rates 1 = 0.006, 1 = 0.004 and 3 = 0.001 per hour respectively. Assuming mission time of 20 hrs. and system reliability of 0.92, find failure rates as well as reliability of each subsystem for entire mission period by ARINC’ method of Reliability Allocation.
- b)[10]
Calculate the reliability of the system shown in following Fig. (1). The value shows the reliability of individual components in the system. Fig. (1)
OR- a)
Q4
- a)[8]
A system consists of three units connected in series, with reliabilities R 1 = 0.70, R 2 = 0.80 and R 3 = 0.90. It is desired that the reliability of the system to be 0.65. How should this be apportioned among three units by Minimum Effort Method?
Also asked:May 2023
- b)[10]
Evaluate the Reliability of System shown in following Fig. (2) By Conditional Probability Approach. Fig. (2)
- a)
Q5
- a)[8]
What is FMECA? Give the procedure of FMECA. State importance of RPN in FMECA, with example.
- b)[9]
Fig. (3) 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”. Fig. (3)
OR- a)
Q6
- a)[8]
Write Short notes on (Any 2) : i) Fault Tree Analysis ii) Ishikawa for failure representation (Cause Effect Diagram) iii) Symbols used in ETA
- b)[9]
For an emergency operation theatre in a hospital, the power is obtained from the main city supply through a transformer connected in series. To ensure an uninterrupted supply, an auxiliary generator is also used with a suitable switch over. Refer Fig. (4). The probability of failure of the main city supply is 0.01 and transformer reliability is 0.996. The auxiliary power generator has a reliability factor of 0.99. Draw a block diagram for the system. Construct the fault tree and calculate reliability of the system. Fig. (4)
- a)
Q7
- a)[8]
Define Maintainability and Availability For the system from the following data collected at a plant. Mean time before failure : 35 Hrs. Mean time to repair : 10 Hrs. Administrative and logistic time : 50% of MTTR Calculate operational availability and inherent availability of the plant.
- b)[10]
This part has equations that don’t show as text. Open the PDF to read it.
OR- a)
Q8
- a)[8]
What is meant by Accelerated test in evaluating Reliability? Give at least six point differences between Highly Accelerated Life Testing (HALT) and Accelerated Life Testing (ALT).
Also asked:May 2023
- b)[10]
This part has equations that don’t show as text. Open the PDF to read it.
- a)