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NEW QUESTION 152
A reliability test of 12 pumps is terminated at 1000 hours. There were 5 failures as follows, what is the median rank % for the 4th failure ?
Response:
- A. 40.00%
- B. 24.48%
- C. 29.84%
- D. 25.62%
Answer: C
NEW QUESTION 153
What percentage of the material is expected to fail?
Response:
- A. 8.1%
- B. 1.4%
- C. 2.0%
- D. 2.3%
Answer: D
NEW QUESTION 154
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. Between 0 and -1
- B. Between 0 and +1
- C. Equal to 1
- D. Greater than 1
Answer: A
NEW QUESTION 155
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. Chi square.
- B. Student's t
- C. Normal
- D. F
Answer: D
NEW QUESTION 156
In general, one should select the highest component parameter ratings feasible so that:
I. Failure rates may be minimized.
II. Probability of secondary failure is minimized.
III. Safety margins are offered against unforeseen transients.
Response:
- A. I and III only
- B. I, II and III
- C. I only
- D. I and II only
Answer: B
NEW QUESTION 157
A key distinction between Taguchi designed experiments and classical designed experiments is that Taguchi designs Response:
- A. Do not rely on randomization and classical experiments do.
- B. Are not orthogonal and classical designs are.
- C. Include 2-level factors and classical design do not.
- D. Are full-factorial and classical designs are not.
Answer: A
NEW QUESTION 158
Which of the following statement is TRUE about environmental stress screening (ESS)?
Response:
- A. It is a form of accelerated testing.
- B. It stresses equipment beyond design limits
- C. It involves random sampling
- D. It is used to validate a design.
Answer: C
NEW QUESTION 159
A standard parts program is likely to have which of the following positive and negative effects?
Response:
- A. Option D
- B. Option B
- C. Option A
- D. Option C
Answer: A
NEW QUESTION 160
A mission profile is:
I. Time-phased.
II. A summary of events and environments.
III. All activities from initiation to completion of a mission.
Response:
- A. III only
- B. I and III only
- C. I, II and III
- D. II and III only
Answer: C
NEW QUESTION 161
The equation below represents
Response:
- A. The limits for a Range chart.
- B. The probability of meeting specification.
- C. The process capability adjusted for centering.
- D. The limits for an X Bar control chart.
Answer: C
NEW QUESTION 162
Derating a component to 50 percent of its operating value will generally decrease its failure rate by a factor of:
Response:
- A. Less than 10 percent.
- B. Greater than 30 percent.
- C. Greater than 10 percent but less than 30 percent.
- D. Greater than 50 percent.
Answer: B
NEW QUESTION 163
Specifically, up-time ratio is a measure of:
Response:
- A. Hazard rate.
- B. Availability.
- C. Maintenance action rate.
- D. Maintainability
Answer: B
NEW QUESTION 164
When failed field item are returned for failure investigation, which of the following steps should be taken first?
Response:
- A. Each item's predicted reliability should be compared with its actual reliability.
- B. The manufacturing process should be reviewed to ensure that it was followed during the production of the failed items.
- C. The physics of failure should be used to determine failure mechanism.
- D. Each item should be investigated to classify and completely determine the failure mode
Answer: D
NEW QUESTION 165
An employee is injured on the job. The employer has proven to have a good safety and health program.
Generally the employee has which of the following options available to him/her?
Response:
- A. Workman's compensation.
- B. Contributory negligence.
- C. Caveat venditor.
- D. Caveat emptor.
Answer: A
NEW QUESTION 166
Which of the following is the MOST appropriate reason for selecting accelerated life testing for an expensive product to determine adherence to design requirements?
Response:
- A. The test time to provide adequate reliability assurance under normal operating conditions is too long.
- B. The error in the population due to part-to-part variation is too large.
- C. The current sample size and the life distribution show wear-out is likely
- D. The probability density function of the product follows either a log normal or a Weibull distribution.
Answer: A
NEW QUESTION 167
Which of the following statements is TRUE about human factor points?
Response:
- A. They are not necessary until the product has been designed and field tested.
- B. They are most costly to incorporate during the concept phase.
- C. They generally cause schedule slippage whenever they are incorporated.
- D. They should be incorporated during the design phase.
Answer: D
NEW QUESTION 168
What is the factor of safety for the material?
Response:
- A. 1.50
- B. 0.75
- C. 1.33
- D. 0.66
Answer: C
NEW QUESTION 169
50 resisters from a lot of 75,000 were tested. The average was 3,306 ohms with a variance of 21,609 ohm 2 . From this information, we may conclude with 99% confidence, that at least 95% of this lot will have resistance values in the range of Response:
- A. 2,865 - 3,747 ohms
- B. 2927 - 3,685 ohms
- C. 2,846 - 3,766 ohms
- D. 3,012 - 3,600 ohms
Answer: B
NEW QUESTION 170
Maintainability of equipment may be measured in terms of:
I. Maintenance dollar cost.
II. Maintenance man-hours.
III. Repair time
Response:
- A. II only
- B. III only
- C. I and III only
- D. I, II and III
Answer: D
NEW QUESTION 171
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. I, II and III
- B. I and III only
- C. I only
- D. II only
Answer: D
NEW QUESTION 172
A failure reporting and corrective action system should ensure that all steps are taken to:
Response:
- A. Record costs associated with the corrective action.
- B. Determine responsibilities for failures.
- C. Define the goals of the FRACAS team.
- D. Identify, investigate and analyze failures.
Answer: D
NEW QUESTION 173
The probability of an accident for the head event "H" given below is:
Response:
- A. 0.0700.
- B. 0.1100.
- C. 0.1125.
- D. 0.0689.
Answer: D
NEW QUESTION 174
Combined environmental reliability testing allows for a:
Response:
- A. Method for certification of test results.
- B. Range of test conditions in excess of design tolerances
- C. Use of a common acceleration factor for relative MTTF from its accelerated condition to its normal condition
- D. Multiple stress test
Answer: D
NEW QUESTION 175
Fifteen(15) motors were tested for a total of 1,200 cumulative hours, with four failure occuring. The test was then failure-truncated. If the failure rate is assumed to be constant, what is the 95% lower confidence limit of MTBF?
Response:
- A. 609 hours
- B. 876 hours.
- C. 155 hours.
- D. 131 hours.
Answer: C
NEW QUESTION 176
Corrective maintenance is performed in order to
Response:
- A. Restore a system to acceptable operation after a failure has occurred.
- B. Correct potential failure on a regular schedule before they occur.
- C. Restore a system to acceptable operation during scheduled downtime.
- D. Reduce failure occurrence as directed by condition assessments.
Answer: A
NEW QUESTION 177
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