Exam Details
| Subject | reliability enginering (elective – i) | |
| Paper | ||
| Exam / Course | f.y. m.tech. (civil -structural engg.) | |
| Department | ||
| Organization | solapur university | |
| Position | ||
| Exam Date | October, 2018 | |
| City, State | maharashtra, solapur |
Question Paper
F.Y. M.Tech. Mechanical (Design Engineering) (Semester (New CBCS)
Examination, 2018
reliability enginering (Elective
Day and Date Wednesday, 12-12-2018 Total Marks 70
Time 10.00 a.m. to 1.00 p.m.
Note All questions are compulsory.
Assume suitable data if necessary.
Figure to right indicates marks.
SECTION I
1. For a system having Weibull failure distribution with a shape parameter of
1.4 and a scale parameter of 550 days, find the following 5
R (100 days)
MTTF
The standard deviation
tmed,tmode
The design life for a reliability of 0.90.
What are the three mathematical approaches for obtaining an item's
meantime to failure 6
2. In an accelerated test to determine the time to failure of friction clutches, the
results showed that the Minimum duration 5hr, Maximum duration 10 hr,
Mean duration 7 hr, coefficient of variation 0.1. Assuming a beta distribution,
determine the probability that clutch, during the accelerated test, will fail
within 9 hours. 6
In order to determine the tensile strength of the material of a supply of
connecting rods, samples of tensile specimens were prepared and tests
conducted. The results showed a normal distribution with a mean tensile
strength of 310 Mpa and a standard deviation of 34.5 Mpa. If the consignment
involved 300 connecting rods, estimate
How many connecting rods can be expected to have a strength less
than 275 Mpa and
How many connecting rods can be expected to have a strength between
275 Mpa and 410 Mpa Use data if needed for f(z -1.01) 0.1562
and f(z 0.9981. 6
3. Write short note (any three)
Hazard rate function
Bathtub curve
Life cycle of product
Lognormal distribution used in reliability.
SECTION II
4. What are steps for performing FMEA (Failure Mode Effect Analysis) 5
Explain fault tree analysis with suitable example. 6
5. A network made up of seven independent units representing a system is
shown in figure. Each unit's reliability, Ri for i 4 and is given.
Calculate the network reliability by using the network reduction method. 6
Figure 01 A seven independent unit reliability network.
Explain reliability life testing. 6
6. Write short note (any three)
Reliability evaluation methods.
Ideal reliability growth curve.
Cause and effect diagram.
Discuss the need for maintainability.
Examination, 2018
reliability enginering (Elective
Day and Date Wednesday, 12-12-2018 Total Marks 70
Time 10.00 a.m. to 1.00 p.m.
Note All questions are compulsory.
Assume suitable data if necessary.
Figure to right indicates marks.
SECTION I
1. For a system having Weibull failure distribution with a shape parameter of
1.4 and a scale parameter of 550 days, find the following 5
R (100 days)
MTTF
The standard deviation
tmed,tmode
The design life for a reliability of 0.90.
What are the three mathematical approaches for obtaining an item's
meantime to failure 6
2. In an accelerated test to determine the time to failure of friction clutches, the
results showed that the Minimum duration 5hr, Maximum duration 10 hr,
Mean duration 7 hr, coefficient of variation 0.1. Assuming a beta distribution,
determine the probability that clutch, during the accelerated test, will fail
within 9 hours. 6
In order to determine the tensile strength of the material of a supply of
connecting rods, samples of tensile specimens were prepared and tests
conducted. The results showed a normal distribution with a mean tensile
strength of 310 Mpa and a standard deviation of 34.5 Mpa. If the consignment
involved 300 connecting rods, estimate
How many connecting rods can be expected to have a strength less
than 275 Mpa and
How many connecting rods can be expected to have a strength between
275 Mpa and 410 Mpa Use data if needed for f(z -1.01) 0.1562
and f(z 0.9981. 6
3. Write short note (any three)
Hazard rate function
Bathtub curve
Life cycle of product
Lognormal distribution used in reliability.
SECTION II
4. What are steps for performing FMEA (Failure Mode Effect Analysis) 5
Explain fault tree analysis with suitable example. 6
5. A network made up of seven independent units representing a system is
shown in figure. Each unit's reliability, Ri for i 4 and is given.
Calculate the network reliability by using the network reduction method. 6
Figure 01 A seven independent unit reliability network.
Explain reliability life testing. 6
6. Write short note (any three)
Reliability evaluation methods.
Ideal reliability growth curve.
Cause and effect diagram.
Discuss the need for maintainability.
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