PTU M.Tech Paper 2012 Reliability of Electronics & communication Systems

PTU M.Tech Paper 2012 Reliability of Electronics & communication Systems Punjab Technical University Exam 2012 Reliability of Electronics & communication Systems Test September and March Question Paper Free Download Punjab Technical University Reliability of Electronics & communication Systems Question Papers 2012 PTU M.Tech Question Paper 2012 for all students Previous Year old Past Papers of PTU M.Tech Paper 2012 Reliability of Electronics & communication Systems Punjab Technical University September 2012 and March 2012 Exam M.Tech Sample Model Question Papers Free Download PDF

Reliability of Electronics & communication Systems

Qi) Define the terms reliability, availability, quality and failure. What is meant by failure of systems and discuss various modes of failures.
Q2) (a) The PDF for the time to failure in years of the drive train on a Regional Transit Authority bus is given by f(t) = 0.2-0.02t 0 t 10 yr
(i) Show that the hazard rate function is increasing, indicating continuous wear out over time.
(ii) Find the MTTF.
(iii) Find the median time to failure.
(iv) Find the mode of the failure distribution.
(b) Discuss Weibull distribution in detail.
Q3) (a) A gearbox has two independent failure modes: a constant failure rate of 0.0003 and a linearly increasing (wearout) failure rate given by A(t) t/(5×105). Find the reliability ofthe gearbox for 100 hr of operation.
(b) Define availability, average availability, inherent availability, achieved availability and operational availability.
Q4) (a) The time to failure of fluorescent lights in a large office building is exponentially distributed with a failure rate of 0.03.125/hr. How many spare tubes must the building custodian maintain to have at least a 0.95 probability of replacing all failures on a given day? Assume continuous 24-hour use of the lights.

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