TECH SPOT: SAMPLE CRE QUESTIONS (Part 24)

1. A computer chip manufacturer averages 7 defects per chip. What is the probability of a chip containing less than 3 defects?
A. 0.00638

B. 0.02234

C. 0.02963

D. 0.02872

2. Given the following data: (where (-) indicates censored) -309,229,386,-104,180,-217,-167,168,122,138
Determine the best fit Weibull parameters β,η, t0?
A. β=2.76,η=261.1, t0= 0.0

B. β=0.88,η=147.86, t0=113.76

C. β=2.61,η=278.2, t0=85.

D. β=1.53,η=183, t0= 0.0

3 . A parallel system is composed of two independent and identical active units. Each unit may fail due to a hardware failure or a noncritical human error, The system may fail due to the occurrence of a critical human error, fc=0.01.
The probability of occurrence of a hardware failure and a noncritical human error are F=0.05 & fnc=0.02, respectively.
What is the system’s reliability?

A. 0.9853

B. 0.8667

C. 0.8581

D. 0.9952

4. Which of the following can be prevented with Preventive maintenance:
I. Handling Damage, II. Poor Quality Control, III. Improper installation, IV. Inadequate design
A. I & III,

B. I, II & III

C. None of the above

D. All of the above

5. You are developing a new product. To effectively market this product the failure rate of your product must be 1/1000 hours or less. In testing to date, you have experienced failures at 30 hours, 600 hours, 1400 hours and 2500 hours. How much more testing (and fixing) is required?
A. 2000hrs,

B. 2500hrs

C. 4500hrs

D. 5000hr

6. The Product Development Maturity Path consists of 5 Phases:
Continuously Improve, Launch, Streamline, Stabilize, and Standardize
Place them in order:
A. Continuously Improve, Launch, Streamline, Stabilize, and Standardize
B. Launch, Streamline, Stabilize, Standardize, and Continuously Improve
C. Launch, Stabilize, Streamline, Standardize, and Continuously Improve
D. Launch, Stabilize, Standardize, Streamline, and Continuously Improve

7. What is the Best time for Reliability Test Planning?
A. Production phase,

B. Early stage of the product development phase,

C. Before the production phase

D. Field return failure analysis phase

8. Below are some statistics for a piece of equipment:

MTBF=Mean time between failure = 527 hrs

MTBMA=Mean time between maintenance actions=144 hrs

MTTR=mean time to repair=5 hrs

MMAT=mean maintenance action time=3 hrs

MAMT=mean active maintenance time= 6 hrs

What is the achieved availability?

A.0.98

B. 0.273

C.0.966

D. 0.820

9. An electronic system needs one of 2 identical and parallel power supplies to be operational. Power supply reliability is 0.95. Both power supplies are activated during system operation. What is the reliability of system power supply?
A. 0.9575

B. 0.9075

C. 0 .9975

D. 0.8975

10. An electric motor was run in a life test at 4 speeds at a constant load.
The results are in Table to the right. Using the Inverse Power Law(IPL) model. What is the Acceleration Factor?
A. 30.63

B. 44.6

C 50.0

D. 42.9

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Sample Questions

TECH SPOT: SAMPLE CRE QUESTIONS (Part 24)

1. A computer chip manufacturer averages 7 defects per chip. What is the probability of a chip containing less than 3 defects?A. 0.00638 B. 0.02234 C. 0.02963 D. 0.02872     2. Given the following data: (where (-) indicates censored) -309,229,386,-104,180,-217,-167,168,122,138Determine the best fit Weibull parameters β,η, t0? A. β=2.76,η=261.1, t0= 0.0 B. β=0.88,η=147.86, t0=113.76

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