Name of the College : SREE CHAITANYA COLLEGE OF ENGINEERING
University : JNTUH
Department : ELECTRICAL AND ELECTRONICS ENGINEERING
Subject Code/Name : 07A70207/RELIABILITY ENGINEERING AND APPLICATIONS TO POWER SYSTEMS
Year/Sem : IV/I
Website : scce.ac.in
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/scce.ac.in/4924-07A70207%20%20RELIABILITY%20ENGINEERING%20AND%20APPLICATIONS%20TO%20POWER%20SYSTEMS.pdf
SCCE Reliability Engineering Question Paper
B.Tech IV Year I Semester Examinations, December-2011
(ELECTRICAL AND ELECTRONICS ENGINEERING)
Related : Sree Chaitanya College Of Engineering 07A70210 Neural Networks & Fuzzy Logic B.Tech Question Paper : www.pdfquestion.in/4923.html
Time: 3 hours
Max. Marks: 80
Answer any five questions :
Set – I
All questions carry equal marks :
1.a) Define Reliability and discuss about the discrete random variables and continuous random variables.
b) In a sample of 100 nails, 10 are found to be defective of the head, 15 are found to be defective of the tail, 25 are found to have both the defects. What is the probability of packing a nail without any defect? [8+8]
2.a) Explain Binomial distribution.
b) In a certain manufacturing process, one percent of the products are known to be defective. If 50 items are purchased by a customer, what is the probability of getting two or less number of defectives? Use Poison distribution to solve the problem. [8+8]
3.a) Explain Weibull distribution with graphs.
b) A component has a reliability of 0.9 for a mission time of 50 hrs. What is the
reliability for a mission time of 100 hrs and 500 hrs? [8+8]
4.a) Explain how reliability is evaluated for a system with ( r/n) configuration?
Calculate the reliability of the above system with Network reduction method as shown in figure 1. [8+8]
5. A system consists of two identical components with independent failures, but only one repair facility. When one component is down, if the other component fails, it may have to wait.
Calculate the steady state probabilities for this state space diagram as shown in figure 2. [16]
6.a) Explain how Cumulative probability and Cumulative frequency evaluation is done for merged states by examples.
b) Explain LOLP, LOLE for generation system reliability analysis. [8+8]
7.a) Estimate the reliability of the system if each component has a reliability of 0.9 and choose ‘B’ as the critical component as shown in figure 3.
b) Define the following terms:
a) Tie sets b) Cut sets c) Minimal Cut Sets d) Minimal tie Sets. [8+8]
8. Write short notes on:
a) Reliability indices evaluation for Radial Networks in distribution systems.
b) Decomposition method for composite systems.
c) Frequency and duration concept
d) Markov chains. [16]
Set – II
Code No: 07A70207
1.a) Define Reliability and discuss about the probability density function, Cumulative probability distribution function of a continuous random variables.
b) Explain conditional probability, with an example. [8+8]
2.a) Explain Poisson’s distribution.
b) In a certain manufacturing process, one percent of the products are known to be defective. If 50 items are purchased by a customer, what is the probability of getting two or less number of defectives? Use binomial distribution. [16]
3.a) Explain Exponential distribution with graphs.
b) A large number of identical relays have T with Weibull distribution with ß=0.5 and a =10 years. What is the probability that a relay will survive:
a) 1 year b) 5 years c) 10 years. [16]
4. A 3 in 1 music system is shown in figure 1. The reliabilities of each component are given in the figure. Calculate the reliability of the system in the following modes of operation:
a) Stereo record b) Mono cassette player c) Radio receiver. [16]
5. The state space diagram of a system is shown in figure 2. Merge the states 2 & 3 to form state 23. Calculate probability, arrival and departure rate for this lumped state. [16] 3
6.a) Explain Minimal tieset method for reliability evaluation.
b) Calculate the reliability of the bridge Network using Minimal Cut Set method as shown in figure 3. If each component reliability is 0.9. [8+8]
7.a) Explain the reliability model of a generation system.
b) Explain the Decomposition method for the analysis of composite system reliability. [8+8]
8. Write short notes on:
a) Distribution system reliability indices evaluation.
b) LOLP, LOLE for generation system.
c) Frequency and duration concept
d) Laplace Transform approach for evaluation of probability. [16]