GATE PI topic:reliability-maintenance PYQs & Answers — Page 2

Questions 11–18 of 18. Imported answers require independent review unless marked reviewed.

Topic practice 18 questionsPage 2 of 2

There are a number of identical components in a parallel system. When the system reliability is 0.97 and the reliability of each individual component is 0.68, the number of identical components in the system is (if actual value is a fraction, it may be rounded up to the next higher integer).

Your answerChoose one option.

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Suppose the control system of a fighter jet consists of three unrelated components in series, and it is desired to have 98% reliability of the system. If the reliability level of all the components is the same, then the reliability of each component (rounded off to three decimal places) is __________.

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The availability of an old photocopier was 90% and the Mean Time Between Failure (MTBF) was 200 days. It has been replaced with a new photocopier having an availability of 95%. Now, the Mean Time to Repair (the time during which the photocopier is unavailable for service) has increased by 5 days. The MTBF of the new photocopier (rounded off to the nearest integer) in days is ____________.

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The mean time to repair (MTR) for a repairable system is 30 minutes. When maintenance time changes from 20 minutes to 40 minutes, the net increase in maintainability is closest to

Your answerChoose one option.

0.15

0.25

0.45

0.60

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A monitoring system has seven components. The reliability of each component is shown in the figure. The system reliability is ______ (round off to 2 decimal places)

Diagram for Production and Industrial Engineering question 52

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A machine consists of three components P, Q and R connected in series. The reliabilities of P, Q and R are 0.97, 0.86 and 0.93, respectively. To increase the reliability of the machine, two additional stand-by units of Q are attached. The overall reliability (up to two decimal places) of the machine is ______

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The mean time between failures of a machine is 400 hour. If the availability of the machine is 80%, the mean time to repair (in hour) is ______

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An air conditioner unit is expected to run continuously. The mean time between failures (MTBF) for this unit is 2,000 hours and the mean time to repair (MTR) is 48 hours. The availability of the air conditioning unit is (up to three decimal places).

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GATE PI topic:reliability-maintenance PYQs

Question 28

Question 24

Question 52

Question 36

Question 52

Question 21

Question 22

Question 45