If the MTBF is 60 hours, the failure rate is (per hour) 0.750 B. 0.001 C. 0.017

Question

If the MTBF is 60 hours, the failure rate is (per hour)

0.750 B. 0.001 C. 0.017 D. zero

As the RDF increases, the measure of risk exposure is affected:

A. inversely B. directly C. not at all

Assuming that the reliability for three series connected subsystems is 0.99 each, the equivalent 'R' is

A. 1.0 B. 0.999999 C. 0.97 D. 0.99 E. None of these

The Binomial Distribution probabilities are akin to:

A. the Normal Distribution B. the Poisson Distribution but inverted

C. sampling with replacement D. sampling without replacement

Explanation / Answer

1) If the MTBF is 60 hours, the failure rate is (per hour)

answer c)0.017

Meantime between failure= 60 hrs

Failure rate =?

MTBF= 1/ Failure rate

failure rate F(N)= 1/MTBF= 1/60 = 0.017.

2)As the RDF increases, the measure of risk exposure is affected:

answer b) Directly (the measures of risk-informed applications are RDF risk decrease factor and RIF risk increase factor, analysis of the systems and components is important for safety.RDF increases the measure of exposure effected directly).

3)Assuming that the reliability for three series connected subsystems is 0.99 each, the equivalent 'R' is

answer E) .none of the above

As they are connected in series with reliability 0.99 each the formulae for caluclating

R(eq)= R1 +R2 +R3+....+Rn=

= 0.99+0.99+0.99= 2.97

4)The Binomial Distribution probabilities are akin to:

  D. sampling without replacement

(The binomial distribution is the approximate probability model for sampling without replacement from a finite (S–F) population provided the sample size n is small relative to the population size N; the hypergeometric distribution is the exact probability model for the number of S’s in the sample. )

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