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engineering 22

please look at the up loaded file .

Q1- It is known that 1 out of 200 test performed in Auxiliary Power Unit results in a failure. (a) What is the probability that the failure occurs at the 20th flight test? (Round up to 4 digits) (b)? What is the average time to fail?

Answer:

0

Q3- Calculate the reliability of the system at t=1.5 year (Round up to 4 digits)?

Rs(t)=πRi(t)Rp(t)=1-π(1-Ri(t))

Unit

λi

t

EXP(-λi*t)

R1

Backup Battery

0.1

1.5

R2

250V Power Inverter

0.12

1.5

R3

Grid Power Supply

0.09

1.5

R4

Power Supply Switch

0.05

1.5

R5

Air Conditioning Unit

0.065

1.5

Answer:

Q4- The life time of a mechanical device is Weibull distributio with scale parameter (Ɵ=500 hr) and Shape parameter (β=2.5). What is the average line time of the device?

Answer:

 

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