Analysis of data on all product returns is important because: I. Failure rates change with length of product usage. II. Changes in design and in customer use are often well reflected. III. Immediate feedback and analysis of product performance becomes available. Response:
Which of the following graphs represents a product that is a good candidate for an accelerated degradation test involving overstress testing? Response:
One of the descriptions of component failures can be explained by a mathematical model with a formula showing that the rate of chemical reaction varies exponentially with a rise in operating temperature. This law is known as the: Response:
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:
In standby parallel systems, imperfect switching means : I. The switch is not perfect. II. The secondary unit is on back-up. III. The reliability of the system is less than with perfect switching. IV. The secondary unit has the same reliability as the primary unit. Response:
