[Nov 27, 2021] Prepare For The CRE Question Papers In Advance
CRE PDF Dumps Real 2021 Recently Updated Questions
NEW QUESTION 14
Which of the following statements is TRUE nonrepairable items?
Response:
- A. Reliability is the survival probability that failure of the items will not occur during the period of interest when more than one failure can occur
- B. Their primary unit of measure is failure severity.
- C. Reliability is survival probability over the expected life of the items when only one failure can occur
- D. Their primary unit of measure is mean time to replace.
Answer: C
NEW QUESTION 15
The optimum cost point for total life cycle costs occurs:
Response:
- A. When operations and maintenance costs are minimized.
- B. When reliability program expenditures are maximized.
- C. When manufacturing and development costs are minimized.
- D. When acquisition costs plus ongoing costs are minimized.
Answer: D
NEW QUESTION 16
In an elevated-temperature test on an electronic system, which of the following models is used to calculate the acceleration factor?
Response:
- A. Exponential model.
- B. Inverse power law model.
- C. Lognormal model.
- D. Arrhenius model.
Answer: D
NEW QUESTION 17
Data collection for a failure reporting, analysis, and corrective action system is important. The control of input data is BEST determined by:
Response:
- A. Possible cause identification
- B. The use of a form.
- C. A failure review board.
- D. Training of data collectors.
Answer: D
NEW QUESTION 18
To achieve 96 percent reliability at a 90 percent confidence level:
Response:
- A. Units must be redundant.
- B. 25 units with no failures is required.
- C. 100 units with one failure is required
- D. 20 units with no failures is required.
Answer: C
NEW QUESTION 19
The main purpose of environmental stress screening is which of the following?
Response:
- A. To assist in the selection of standardized parts.
- B. To subject parts to extremes
- C. To eliminate infant mortality failures.
- D. To eliminate supplier inspections.
Answer: C
NEW QUESTION 20
What is meant by catastrophic failure?
I. A gradual change in the operating characteristics of an item resulting in no loss of useful performance.
II. A sudden change in the operating characteristics of an item resulting in complete loss of useful performance.
III. A gradual change in the operating characteristics of an item resulting in complete loss of performance.
Response:
- A. II and III
- B. II
- C. All of the above.
- D. I
Answer: B
NEW QUESTION 21
As a result of improper machining, a gear-tooth in a vehicle's transmission breaks causing the transmission to lock up and the vehicle to crash, injuring the driver. The failure mode in this case should be identified by the reliability engineer as the Response:
- A. Improper machining.
- B. Injured driver.
- C. Jammed transmission.
- D. Vehicle crash.
Answer: C
NEW QUESTION 22
The investment in automated test equipment is often justified under which of the following circumstances Response:
- A. Repair times must be short.
- B. Numerous tests must be performed.
- C. Conformance records are required.
- D. Traceable records are required.
Answer: B
NEW QUESTION 23
All of the following statements are TRUE about confidence interval EXCEPT Response:
- A. A larger sample size would yield a smaller width
- B. The width indicate the uncertainty in estimates.
- C. The width does not depend on the confidence level.
- D. A smaller sample size would yield a larger width
Answer: C
NEW QUESTION 24
What is the MOST important role performed by a failure review board?
Response:
- A. To ensure that corrective action is effective.
- B. To assess failures.
- C. To monitor reliability growth.
- D. To monitor corrective action.
Answer: A
NEW QUESTION 25
In an analysis of variance, which of the following distributions is the basis for determining whether the variance estimates are all from the same population?
Response:
- A. F
- B. Student's t
- C. Normal
- D. Chi square.
Answer: A
NEW QUESTION 26
Which of the following is the GREATEST benefit of a fault-tree analysis?
Response:
- A. It is comprehensive and readily converted to a computer program.
- B. It is systematic and identifies ways to avoid failures.
- C. It is bottom-up and provides detailed accident scenario.
- D. It is easy to perform and does not require a computer program.
Answer: B
NEW QUESTION 27
Weibull analysis is a way to quickly and easily analyze field data or interval test data. The limits of the use of this technique include having a good estimate for the:
Response:
- A. Average quality of the production lots.
- B. MTBF.
- C. Expected life.
- D. Shape parameter.
Answer: D
NEW QUESTION 28
Preventive maintenance is characterized by:
I. Replacing failed/defect items as they are found in normal service use II. A planned program of tests, inspections, and/or replacements III. Replacing items just before they fail Response:
- A. II only
- B. I, II and III
- C. I and III only
- D. I only
Answer: A
NEW QUESTION 29
If the plating time of a tube increases as the inside diameter decreases, then the correlation coefficient for the insider diameter versus plating time would be:
Response:
- A. Equal to 1
- B. Between 0 and +1
- C. Greater than 1
- D. Between 0 and -1
Answer: D
NEW QUESTION 30
Product reliability concerns the relationship of product function to:
Response:
- A. Time.
- B. Cost.
- C. Customer demands.
- D. Design.
Answer: A
NEW QUESTION 31
What is the reliability of the power switching system schematic on the left after 30,000 hours ? The electric utility primary power system (A) has a failure rate of 0.00001 failure/hour.
The motor generator backup system (B) has a failure rate of 0.0007 failure/hour. The standby system has an imperfect switch with 0.90 reliability per operation.
Response:
- A. 0.87
- B. 0.80
- C. 0.83
- D. 0.75
Answer: D
NEW QUESTION 32
Which process has as its principle parts
- Defining the system.
- Establishing the reliability model.
- Assigning failure rates to the equipment involved.
- Computing the reliability for each function and for the system.
Response:
- A. Defining the program plan.
- B. Predicting reliability.
- C. Design review.
- D. Demonstrating the reliability.
Answer: B
NEW QUESTION 33
What is this system's reliability at 700 hours?
Component failure data is : - Failure rate of A = 0.0007 failures/hr - Reliability of B = 0.92 - MTTF of C =
1400 hours - Reliability of D = 0.85.
Response:
- A. 0.994
- B. 0.986
- C. 0.998
- D. 0.952
Answer: C
NEW QUESTION 34
Which of the following techniques is MOST beneficial in tracking a process to determine whether corrective action should be taken?
Response:
- A. Pareto analysis.
- B. Time series plotting.
- C. Control charting.
- D. Trend analysis.
Answer: C
NEW QUESTION 35
A go/no-go device is tested until it fails. If X is the number of tests to first failure with no wear out present, and the probability of success on each test is .99, then the probability that X is greater than 5 is:
Response:
- A. 0.9610
- B. 0.9410
- C. 0.9310
- D. 0.9510
Answer: D
NEW QUESTION 36
A key distinction between Taguchi designed experiments and classical designed experiments is that Taguchi designs Response:
- A. Are full-factorial and classical designs are not.
- B. Do not rely on randomization and classical experiments do.
- C. Are not orthogonal and classical designs are.
- D. Include 2-level factors and classical design do not.
Answer: B
NEW QUESTION 37
Which of the following is a model used for monitoring reliability growth?
Response:
- A. Arrehenius
- B. Normal
- C. Lognormal
- D. Duane
Answer: D
NEW QUESTION 38
When testing is establish failure rate data and reliability predictions, which of the following is NOT normally a feasible acceleration factor with respect to rated conditions?
Response:
- A. Longer time.
- B. Higher temperature.
- C. Higher voltage.
- D. Greater humidity.
Answer: A
NEW QUESTION 39
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